From 1ae5ee5f9fd875f064bb14f839dada74239f637c Mon Sep 17 00:00:00 2001
From: Jean Mertz <git@jeanmertz.com>
Date: Fri, 11 Sep 2026 11:28:28 +0200
Subject: [PATCH 1/2] fix(llm, openai, openrouter, llamacpp): Decode nulls

Optional tool arguments encoded as null by strict providers reach tools
as omitted fields. This lets Bookworm apply its defaults rather than
rejecting `kinds: null`. Explicit values, source-accepted nulls, and
required arguments retain their meaning.

Pair schema conversion with request-local decoding plans, consumed when
streamed arguments become a complete tool call. Cover OpenAI's streaming
and non-streaming paths, OpenRouter, and llama.cpp without changing MCP
transport or persisted event types.

Keep reference resolution and schema composition behavior unchanged.
Decoding through references and general unions remains deferred to
T-0h28vbn; shared dispatch validation remains tracked by T-063sw1z.

Signed-off-by: Jean Mertz <git@jeanmertz.com>
---
 crates/jp_cli/src/cmd/query/turn_loop.rs      |   2 +-
 crates/jp_llm/src/event.rs                    |   8 +
 crates/jp_llm/src/event_builder.rs            |  25 +-
 crates/jp_llm/src/event_builder_tests.rs      |   6 +
 crates/jp_llm/src/provider.rs                 |   4 +
 crates/jp_llm/src/provider/llamacpp.rs        |  47 +--
 crates/jp_llm/src/provider/llamacpp_tests.rs  |   2 +-
 crates/jp_llm/src/provider/openai.rs          | 132 ++++++--
 crates/jp_llm/src/provider/openai_tests.rs    |   2 +-
 crates/jp_llm/src/provider/openrouter.rs      |  55 ++--
 .../jp_llm/src/provider/openrouter_tests.rs   |   4 +-
 .../src/provider/tool_decoding_tests.rs       | 302 ++++++++++++++++++
 crates/jp_llm/src/stream.rs                   |   2 +-
 crates/jp_llm/src/tool.rs                     |   1 +
 crates/jp_llm/src/tool/decoding.rs            |  91 ++++++
 crates/jp_llm/src/tool/decoding_tests.rs      | 115 +++++++
 ...5_forced_tool_soft_forces__raw_events.snap |   2 +
 ...t_multi_turn_conversation__raw_events.snap |   2 +
 .../test_tool_call_auto__raw_events.snap      |   2 +
 .../test_tool_call_function__raw_events.snap  |   2 +
 .../test_tool_call_reasoning__raw_events.snap |   2 +
 ...all_required_no_reasoning__raw_events.snap |   2 +
 ...l_call_required_reasoning__raw_events.snap |   2 +
 .../test_tool_call_stream__raw_events.snap    |   2 +
 ...t_multi_turn_conversation__raw_events.snap |   2 +
 .../test_tool_call_auto__raw_events.snap      |   2 +
 .../test_tool_call_function__raw_events.snap  |   2 +
 .../test_tool_call_reasoning__raw_events.snap |   2 +
 ...all_required_no_reasoning__raw_events.snap |   2 +
 ...l_call_required_reasoning__raw_events.snap |   2 +
 .../test_tool_call_stream__raw_events.snap    |   2 +
 ...t_multi_turn_conversation__raw_events.snap |   2 +
 .../test_tool_call_auto__raw_events.snap      |   2 +
 .../test_tool_call_function__raw_events.snap  |   2 +
 .../test_tool_call_reasoning__raw_events.snap |   2 +
 ...all_required_no_reasoning__raw_events.snap |   2 +
 ...l_call_required_reasoning__raw_events.snap |   2 +
 .../test_tool_call_stream__raw_events.snap    |   2 +
 ...t_multi_turn_conversation__raw_events.snap |  10 +
 .../test_tool_call_auto__raw_events.snap      |  10 +
 .../test_tool_call_function__raw_events.snap  |  10 +
 .../test_tool_call_reasoning__raw_events.snap |  10 +
 ...all_required_no_reasoning__raw_events.snap |  10 +
 ...l_call_required_reasoning__raw_events.snap |  10 +
 .../test_tool_call_stream__raw_events.snap    |  10 +
 ...t_multi_turn_conversation__raw_events.snap |   2 +
 .../test_tool_call_auto__raw_events.snap      |   2 +
 .../test_tool_call_function__raw_events.snap  |   2 +
 .../test_tool_call_reasoning__raw_events.snap |   2 +
 ...all_required_no_reasoning__raw_events.snap |   2 +
 ...l_call_required_reasoning__raw_events.snap |   2 +
 .../test_tool_call_stream__raw_events.snap    |   2 +
 ...t_multi_turn_conversation__raw_events.snap |  10 +
 .../test_tool_call_auto__raw_events.snap      |  10 +
 .../test_tool_call_function__raw_events.snap  |  10 +
 .../test_tool_call_reasoning__raw_events.snap |  10 +
 ...all_required_no_reasoning__raw_events.snap |  10 +
 .../test_tool_call_stream__raw_events.snap    |  10 +
 ..._parallel_tool_round_trip__raw_events.snap |   3 +
 ...t_multi_turn_conversation__raw_events.snap |  10 +
 .../test_tool_call_auto__raw_events.snap      |  10 +
 .../test_tool_call_function__raw_events.snap  |  10 +
 .../test_tool_call_reasoning__raw_events.snap |  10 +
 ...all_required_no_reasoning__raw_events.snap |  10 +
 .../test_tool_call_stream__raw_events.snap    |  10 +
 ...-argument-constraints-before-every-disp.md |  22 ++
 ...issions-through-references-and-composed.md |  37 +++
 67 files changed, 1032 insertions(+), 76 deletions(-)
 create mode 100644 crates/jp_llm/src/provider/tool_decoding_tests.rs
 create mode 100644 crates/jp_llm/src/tool/decoding.rs
 create mode 100644 crates/jp_llm/src/tool/decoding_tests.rs
 create mode 100644 docs/ticket/0h28vbn-decode-strict-tool-omissions-through-references-and-composed.md

diff --git a/crates/jp_cli/src/cmd/query/turn_loop.rs b/crates/jp_cli/src/cmd/query/turn_loop.rs
index 739ff2657..de13794d7 100644
--- a/crates/jp_cli/src/cmd/query/turn_loop.rs
+++ b/crates/jp_cli/src/cmd/query/turn_loop.rs
@@ -556,7 +556,7 @@ pub(super) async fn run_turn_loop(
                             // buffer first so buffered text appears before the
                             // "Calling tool" line (fixes Issue 1).
                             if let Event::Part {
-                                part: EventPart::ToolCall(ToolCallPart::Start { id, name }),
+                                part: EventPart::ToolCall(ToolCallPart::Start { id, name, .. }),
                                 ..
                             } = &event
                             {
diff --git a/crates/jp_llm/src/event.rs b/crates/jp_llm/src/event.rs
index e12d2b0e5..1e988928b 100644
--- a/crates/jp_llm/src/event.rs
+++ b/crates/jp_llm/src/event.rs
@@ -1,6 +1,10 @@
+use std::sync::Arc;
+
 use jp_conversation::{ConversationStream, OverlayAction, OverlayMatcher, OverlayPatch};
 use serde_json::{Map, Value};
 
+use crate::tool::decoding::ArgumentDecoding;
+
 /// Represents a completed event from the LLM.
 ///
 /// In the context of [`crate::Provider::chat_completion_stream`], individual
@@ -110,6 +114,9 @@ pub enum ToolCallPart {
 
         /// Name of the tool to execute.
         name: String,
+
+        /// Request-local decoding instructions, consumed before persistence.
+        decoding: Option<Arc<ArgumentDecoding>>,
     },
 
     /// A raw JSON chunk of tool call arguments.
@@ -281,6 +288,7 @@ impl Event {
             part: EventPart::ToolCall(ToolCallPart::Start {
                 id: id.into(),
                 name: name.into(),
+                decoding: None,
             }),
             metadata: Map::new(),
         }
diff --git a/crates/jp_llm/src/event_builder.rs b/crates/jp_llm/src/event_builder.rs
index a01939e1b..430e1c176 100644
--- a/crates/jp_llm/src/event_builder.rs
+++ b/crates/jp_llm/src/event_builder.rs
@@ -31,7 +31,10 @@
 //!   arrives.
 //!   The Flush after the last chunk marks the tool call as complete.
 
-use std::collections::{HashMap, hash_map::Entry};
+use std::{
+    collections::{HashMap, hash_map::Entry},
+    sync::Arc,
+};
 
 use jp_conversation::{
     ConversationEvent,
@@ -40,7 +43,10 @@ use jp_conversation::{
 use serde_json::{Map, Value};
 use tracing::warn;
 
-use crate::event::{Event, EventPart, ToolCallPart};
+use crate::{
+    event::{Event, EventPart, ToolCallPart},
+    tool::decoding::ArgumentDecoding,
+};
 
 /// Extract the structured JSON payload from a completed list of stream events.
 ///
@@ -163,14 +169,16 @@ impl EventBuilder {
                 Entry::Occupied(mut e) => e.get_mut().merge_tool_call_part(tool_call_part),
                 Entry::Vacant(e) => {
                     let buffer = match tool_call_part {
-                        ToolCallPart::Start { id, name } => IndexBuffer::ToolCall {
+                        ToolCallPart::Start { id, name, decoding } => IndexBuffer::ToolCall {
                             id,
                             name,
+                            decoding,
                             arguments_json: String::new(),
                         },
                         ToolCallPart::ArgumentChunk(json) => IndexBuffer::ToolCall {
                             id: String::new(),
                             name: String::new(),
+                            decoding: None,
                             arguments_json: json,
                         },
                     };
@@ -217,8 +225,9 @@ impl EventBuilder {
                 id,
                 name,
                 arguments_json,
+                decoding,
             } => {
-                let arguments = if arguments_json.trim().is_empty() {
+                let mut arguments = if arguments_json.trim().is_empty() {
                     serde_json::Map::new()
                 } else {
                     serde_json::from_str(&arguments_json).unwrap_or_else(|e| {
@@ -226,6 +235,9 @@ impl EventBuilder {
                         serde_json::Map::new()
                     })
                 };
+                if let Some(decoding) = decoding {
+                    decoding.apply(&mut arguments);
+                }
                 ConversationEvent::now(ToolCallRequest {
                     id,
                     name,
@@ -361,6 +373,8 @@ enum IndexBuffer {
         name: String,
         /// Raw JSON arguments accumulated from chunks.
         arguments_json: String,
+        /// Decoding chosen by the first non-empty tool name.
+        decoding: Option<Arc<ArgumentDecoding>>,
     },
     /// Accumulates streamed JSON chunks for a structured response.
     ///
@@ -380,6 +394,7 @@ impl IndexBuffer {
             id,
             name,
             arguments_json,
+            decoding,
         } = self
         else {
             warn!(
@@ -393,12 +408,14 @@ impl IndexBuffer {
             ToolCallPart::Start {
                 id: incoming_id,
                 name: incoming_name,
+                decoding: incoming_decoding,
             } => {
                 if id.is_empty() && !incoming_id.is_empty() {
                     *id = incoming_id;
                 }
                 if name.is_empty() && !incoming_name.is_empty() {
                     *name = incoming_name;
+                    *decoding = incoming_decoding;
                 }
             }
             ToolCallPart::ArgumentChunk(json) => {
diff --git a/crates/jp_llm/src/event_builder_tests.rs b/crates/jp_llm/src/event_builder_tests.rs
index 53c29896a..bea39af3e 100644
--- a/crates/jp_llm/src/event_builder_tests.rs
+++ b/crates/jp_llm/src/event_builder_tests.rs
@@ -45,6 +45,7 @@ fn test_handles_tool_call() {
         EventPart::ToolCall(ToolCallPart::Start {
             id: "call_1".into(),
             name: "test_tool".into(),
+            decoding: None,
         }),
         Map::new(),
     );
@@ -68,6 +69,7 @@ fn test_incomplete_tool_calls_skips_unnamed_buffers() {
         EventPart::ToolCall(ToolCallPart::Start {
             id: "call_1".into(),
             name: "fs_modify_file".into(),
+            decoding: None,
         }),
         Map::new(),
     );
@@ -95,6 +97,7 @@ fn test_merges_multi_part_tool_call() {
         EventPart::ToolCall(ToolCallPart::Start {
             id: "call_42".into(),
             name: "fs_create_file".into(),
+            decoding: None,
         }),
         Map::new(),
     );
@@ -128,6 +131,7 @@ fn test_multi_part_tool_call_first_write_wins_for_id_and_name() {
         EventPart::ToolCall(ToolCallPart::Start {
             id: "first_id".into(),
             name: "first_name".into(),
+            decoding: None,
         }),
         Map::new(),
     );
@@ -138,6 +142,7 @@ fn test_multi_part_tool_call_first_write_wins_for_id_and_name() {
         EventPart::ToolCall(ToolCallPart::Start {
             id: "second_id".into(),
             name: "second_name".into(),
+            decoding: None,
         }),
         Map::new(),
     );
@@ -437,6 +442,7 @@ fn drain_drops_incomplete_tool_call_but_keeps_partial_text() {
         EventPart::ToolCall(ToolCallPart::Start {
             id: "toolu_incomplete".into(),
             name: "some_tool".into(),
+            decoding: None,
         }),
         Map::new(),
     );
diff --git a/crates/jp_llm/src/provider.rs b/crates/jp_llm/src/provider.rs
index caff8699f..ce1fb1003 100644
--- a/crates/jp_llm/src/provider.rs
+++ b/crates/jp_llm/src/provider.rs
@@ -140,6 +140,10 @@ pub(crate) fn trace_to_tmpfile(prefix: &str, value: &impl serde::Serialize) -> S
     }
 }
 
+#[cfg(test)]
+#[path = "provider/tool_decoding_tests.rs"]
+mod tool_decoding_tests;
+
 #[cfg(test)]
 #[path = "provider_tests.rs"]
 mod tests;
diff --git a/crates/jp_llm/src/provider/llamacpp.rs b/crates/jp_llm/src/provider/llamacpp.rs
index 35e244718..1a3f8013d 100644
--- a/crates/jp_llm/src/provider/llamacpp.rs
+++ b/crates/jp_llm/src/provider/llamacpp.rs
@@ -24,7 +24,7 @@ use tracing::{debug, trace, warn};
 
 use super::{
     EventStream, ModelDetails,
-    openai::parameters_with_strict_mode,
+    openai::parameters_with_decoding,
     openai_compat::{merge_consecutive_assistant_messages, parse_chunk},
 };
 use crate::{
@@ -33,7 +33,7 @@ use crate::{
     provider::Provider,
     query::ChatQuery,
     stream::{aggregator::reasoning::ReasoningExtractor, with_tool_call_keepalive},
-    tool::ToolDefinition,
+    tool::{ToolDefinition, decoding::ArgumentDecoders},
 };
 
 static PROVIDER: ProviderId = ProviderId::Llamacpp;
@@ -93,7 +93,7 @@ impl Provider for Llamacpp {
             "Starting Llamacpp chat completion stream."
         );
 
-        let (body, is_structured) = create_request(model, query)?;
+        let (body, is_structured, decoders) = create_request(model, query)?;
 
         trace!(
             body = serde_json::to_string(&body).unwrap_or_default(),
@@ -113,10 +113,10 @@ impl Provider for Llamacpp {
         // silently re-issuing the request.
         es.set_retry_policy(Box::new(Never));
 
-        Ok(with_tool_call_keepalive(
+        Ok(decoders.attach(with_tool_call_keepalive(
             assemble_event_stream(es, is_structured),
             TOOL_CALL_KEEPALIVE_INTERVAL,
-        ))
+        )))
     }
 }
 
@@ -414,7 +414,7 @@ impl Llamacpp {
         model: &ModelDetails,
         query: ChatQuery,
     ) -> Result<serde_json::Value, Error> {
-        let (request, _) = create_request(model, query)?;
+        let (request, ..) = create_request(model, query)?;
         Ok(request)
     }
 }
@@ -422,8 +422,12 @@ impl Llamacpp {
 /// Build the JSON request body for the llama.cpp `/v1/chat/completions`
 /// endpoint.
 ///
-/// Returns `(body, is_structured)`.
-fn create_request(model: &ModelDetails, query: ChatQuery) -> Result<(Value, bool), Error> {
+/// Returns the request, structured-output flag, and tool argument decoding
+/// plans.
+fn create_request(
+    model: &ModelDetails,
+    query: ChatQuery,
+) -> Result<(Value, bool, ArgumentDecoders), Error> {
     let ChatQuery {
         thread,
         tools,
@@ -483,7 +487,7 @@ fn create_request(model: &ModelDetails, query: ChatQuery) -> Result<(Value, bool
     }
 
     messages.extend(convert_events(parts.events));
-    let converted_tools = convert_tools(tools, &tool_choice);
+    let (converted_tools, decoders) = convert_tools(tools, &tool_choice);
     let tool_choice_val = convert_tool_choice(&tool_choice);
 
     trace!(
@@ -543,7 +547,7 @@ fn create_request(model: &ModelDetails, query: ChatQuery) -> Result<(Value, bool
         });
     }
 
-    Ok((body, is_structured))
+    Ok((body, is_structured, decoders))
 }
 
 /// Convert system prompt parts into a list of JSON message values.
@@ -608,25 +612,32 @@ fn convert_events(events: ConversationStream) -> Vec<Value> {
 /// If [`ToolChoice::Function`] is set, only include the named tool. llama.cpp
 /// doesn't support calling a specific tool by name, but it supports `required`
 /// mode, so we limit the tool list instead.
-fn convert_tools(tools: Vec<ToolDefinition>, tool_choice: &ToolChoice) -> Vec<Value> {
-    tools
+fn convert_tools(
+    tools: Vec<ToolDefinition>,
+    tool_choice: &ToolChoice,
+) -> (Vec<Value>, ArgumentDecoders) {
+    let mut decoders = ArgumentDecoders::default();
+    let tools = tools
         .into_iter()
+        .filter(|tool| match tool_choice {
+            ToolChoice::Function(req) => &tool.name == req,
+            _ => true,
+        })
         .map(|tool| {
+            let (parameters, decoding) = parameters_with_decoding(&tool.parameters, true);
+            decoders.insert(&tool.name, decoding);
             json!({
                 "type": "function",
                 "function": {
                     "name": tool.name,
                     "description": tool.docs.schema_description().unwrap_or_default(),
-                    "parameters": parameters_with_strict_mode(&tool.parameters, true),
+                    "parameters": parameters,
                     "strict": true,
                 },
             })
         })
-        .filter(|tool| match tool_choice {
-            ToolChoice::Function(req) => tool["function"]["name"].as_str() == Some(req.as_str()),
-            _ => true,
-        })
-        .collect()
+        .collect();
+    (tools, decoders)
 }
 
 fn convert_tool_choice(choice: &ToolChoice) -> &str {
diff --git a/crates/jp_llm/src/provider/llamacpp_tests.rs b/crates/jp_llm/src/provider/llamacpp_tests.rs
index c6921ced0..fef58be2b 100644
--- a/crates/jp_llm/src/provider/llamacpp_tests.rs
+++ b/crates/jp_llm/src/provider/llamacpp_tests.rs
@@ -77,7 +77,7 @@ fn request_body(
     reasoning: Option<jp_config::model::parameters::PartialReasoningConfig>,
 ) -> serde_json::Value {
     let details = ModelDetails::empty((PROVIDER, "Qwen3.5-9B-GGUF").try_into().unwrap());
-    let (request, _) = create_request(&details, reasoning_query(reasoning)).unwrap();
+    let (request, ..) = create_request(&details, reasoning_query(reasoning)).unwrap();
 
     request
 }
diff --git a/crates/jp_llm/src/provider/openai.rs b/crates/jp_llm/src/provider/openai.rs
index e9e7409f3..5d78584e3 100644
--- a/crates/jp_llm/src/provider/openai.rs
+++ b/crates/jp_llm/src/provider/openai.rs
@@ -38,7 +38,11 @@ use crate::{
     provider::trace_to_tmpfile,
     query::ChatQuery,
     stream::with_tool_call_keepalive,
-    tool::{ToolDefinition, json_schema},
+    tool::{
+        ToolDefinition,
+        decoding::{ArgumentDecoders, ArgumentDecoding},
+        json_schema,
+    },
 };
 
 static PROVIDER: ProviderId = ProviderId::Openai;
@@ -123,13 +127,15 @@ impl Provider for Openai {
         model: &ModelDetails,
         query: ChatQuery,
     ) -> Result<EventStream> {
-        let (request, is_structured, reasoning_enabled) = create_request(model, query)?;
+        let (request, is_structured, reasoning_enabled, decoders) = create_request(model, query)?;
 
         if model.features.contains(&STREAMING_UNSUPPORTED) {
             let response = self.client.create(request).await??;
             let events = map_non_streaming_response(response, is_structured, reasoning_enabled)?;
 
-            return Ok(stream::iter(events.into_iter().map(Ok::<_, StreamError>)).boxed());
+            return Ok(
+                decoders.attach(stream::iter(events.into_iter().map(Ok::<_, StreamError>)).boxed())
+            );
         }
 
         let raw_stream = self
@@ -141,10 +147,10 @@ impl Provider for Openai {
             .try_flatten()
             .boxed();
 
-        Ok(with_tool_call_keepalive(
+        Ok(decoders.attach(with_tool_call_keepalive(
             raw_stream,
             TOOL_CALL_KEEPALIVE_INTERVAL,
-        ))
+        )))
     }
 }
 
@@ -346,9 +352,13 @@ impl Openai {
 
 /// Create a request for the given model and query details.
 ///
-/// Returns `(request, is_structured, reasoning_enabled)`.
+/// Returns the request, structured-output and reasoning flags, and tool
+/// argument decoding plans.
 #[expect(clippy::too_many_lines)]
-fn create_request(model: &ModelDetails, query: ChatQuery) -> Result<(Request, bool, bool)> {
+fn create_request(
+    model: &ModelDetails,
+    query: ChatQuery,
+) -> Result<(Request, bool, bool, ArgumentDecoders)> {
     let ChatQuery {
         thread,
         tools,
@@ -572,13 +582,14 @@ fn create_request(model: &ModelDetails, query: ChatQuery) -> Result<(Request, bo
     };
 
     messages.extend(convert_events(parts.events));
+    let (tools, decoders) = convert_tools(tools);
     let request = Request {
         model: types::Model::Other(model.id.name.to_string()),
         input: types::Input::List(messages),
         include: reasoning_enabled.then_some(vec![Include::ReasoningEncryptedContent]),
         store: Some(false),
         tool_choice: Some(convert_tool_choice(tool_choice)),
-        tools: Some(convert_tools(tools)),
+        tools: Some(tools),
         temperature,
         reasoning,
         max_output_tokens: parameters.max_tokens.map(Into::into),
@@ -614,7 +625,7 @@ fn create_request(model: &ModelDetails, query: ChatQuery) -> Result<(Request, bo
         "Request payload."
     );
 
-    Ok((request, is_structured, reasoning_enabled))
+    Ok((request, is_structured, reasoning_enabled, decoders))
 }
 
 #[expect(clippy::too_many_lines)]
@@ -1687,10 +1698,22 @@ fn ensure_strict_schema(schema: &mut Value) {
     process_strict(schema, &root);
 }
 
-fn process_strict(schema: &mut Value, root: &Value) {
+#[expect(
+    clippy::too_many_lines,
+    reason = "schema rewriting and its decoding instructions share one traversal"
+)]
+fn process_strict(schema: &mut Value, root: &Value) -> ArgumentDecoding {
     let Value::Object(map) = schema else {
-        return;
+        return ArgumentDecoding::default();
     };
+    let mut decoding = ArgumentDecoding::default();
+    // Decoding references and general composition needs a branch-aware schema
+    // walk (T-0h28vbn). Leave those arguments untouched to avoid deleting nulls
+    // accepted by the source schema.
+    let skip_decoding = ["$ref", "allOf", "oneOf"]
+        .iter()
+        .any(|key| map.contains_key(*key))
+        || map.get("anyOf").is_some_and(|v| !is_nullable_pair(v));
 
     // 1. Recurse into $defs / definitions.
     for key in ["$defs", "definitions"] {
@@ -1734,7 +1757,12 @@ fn process_strict(schema: &mut Value, root: &Value) {
             if let Some(Value::Object(props)) = map.get_mut("properties") {
                 for key in &newly_required {
                     if let Some(prop_schema) = props.get_mut(key) {
-                        make_schema_nullable(prop_schema);
+                        let can_decode = ["$ref", "allOf", "anyOf", "oneOf"]
+                            .iter()
+                            .all(|key| prop_schema.get(*key).is_none());
+                        if make_schema_nullable(prop_schema) && can_decode {
+                            decoding.omit_null.push(key.clone());
+                        }
                     }
                 }
             }
@@ -1743,16 +1771,27 @@ fn process_strict(schema: &mut Value, root: &Value) {
 
     // 3. Recurse into property values, items, and anyOf variants.
     if let Some(Value::Object(props)) = map.get_mut("properties") {
-        for prop_schema in props.values_mut() {
-            process_strict(prop_schema, root);
+        for (name, prop_schema) in props {
+            let plan = process_strict(prop_schema, root);
+            if !plan.is_empty() {
+                decoding.properties.insert(name.clone(), plan);
+            }
         }
     }
     if let Some(items) = map.get_mut("items") {
-        process_strict(items, root);
+        let plan = process_strict(items, root);
+        if !plan.is_empty() {
+            decoding.items = Some(Box::new(plan));
+        }
     }
     if let Some(Value::Array(variants)) = map.get_mut("anyOf") {
         for variant in variants.iter_mut() {
-            process_strict(variant, root);
+            let plan = process_strict(variant, root);
+            if !skip_decoding {
+                decoding.omit_null.extend(plan.omit_null);
+                decoding.properties.extend(plan.properties);
+                decoding.items = decoding.items.or(plan.items);
+            }
         }
     }
 
@@ -1792,11 +1831,29 @@ fn process_strict(schema: &mut Value, root: &Value) {
             *map = merged;
             // Re-run on the inlined result.
             process_strict(schema, root);
-            return;
+            return ArgumentDecoding::default();
         }
         // Failed to resolve — put it back.
         map.insert("$ref".to_owned(), Value::String(ref_path));
     }
+    if skip_decoding {
+        return ArgumentDecoding::default();
+    }
+    decoding
+}
+
+// A schema paired with bare null needs no branch selection for object or array
+// values. This includes the wrappers introduced by make_schema_nullable.
+fn is_nullable_pair(value: &Value) -> bool {
+    let Some(variants) = value.as_array() else {
+        return false;
+    };
+    variants.len() == 2
+        && variants.iter().any(|v| {
+            v.as_object().is_some_and(|m| {
+                m.len() == 1 && m.get("type").and_then(Value::as_str) == Some("null")
+            })
+        })
 }
 
 /// Resolve a JSON pointer against the root schema.
@@ -1834,6 +1891,14 @@ fn convert_tool_choice(choice: ToolChoice) -> types::ToolChoice {
 ///
 /// See: <https://platform.openai.com/docs/guides/function-calling#strict-mode>
 pub(crate) fn parameters_with_strict_mode(parameters: &Value, strict: bool) -> Map<String, Value> {
+    parameters_with_decoding(parameters, strict).0
+}
+
+/// Encode parameters and retain the instructions for restoring omissions.
+pub(crate) fn parameters_with_decoding(
+    parameters: &Value,
+    strict: bool,
+) -> (Map<String, Value>, ArgumentDecoding) {
     let mut document = parameters.as_object().cloned().unwrap_or_default();
 
     document.insert("type".to_owned(), "object".into());
@@ -1846,12 +1911,13 @@ pub(crate) fn parameters_with_strict_mode(parameters: &Value, strict: bool) -> M
     document.insert("additionalProperties".to_owned(), (!strict).into());
 
     if !strict {
-        return document;
+        return (document, ArgumentDecoding::default());
     }
 
     let mut document = Value::Object(document);
-    ensure_strict_schema(&mut document);
-    document.as_object().cloned().unwrap_or_default()
+    let root = document.clone();
+    let decoding = process_strict(&mut document, &root);
+    (document.as_object().cloned().unwrap_or_default(), decoding)
 }
 
 /// Check whether a JSON schema `type` value includes `"object"`.
@@ -1891,15 +1957,16 @@ const NULLABLE_OUTER_KEYS: &[&str] = &["description", "title", "default", "examp
 ///
 /// Idempotent: a schema that's already nullable (via either encoding) is
 /// returned unchanged.
-fn make_schema_nullable(schema: &mut Value) {
+/// Returns whether nullability was injected.
+fn make_schema_nullable(schema: &mut Value) -> bool {
     let Value::Object(map) = schema else {
-        return;
+        return false;
     };
 
     let Some(type_val) = map.get("type").cloned() else {
         // No `type` key — could be `anyOf` (already nullable) or `$ref`.
         // Nothing for us to inject here.
-        return;
+        return false;
     };
 
     let already_nullable = match &type_val {
@@ -1908,7 +1975,7 @@ fn make_schema_nullable(schema: &mut Value) {
         _ => false,
     };
     if already_nullable {
-        return;
+        return false;
     }
 
     let is_structured = |t: &str| matches!(t, "array" | "object");
@@ -1930,9 +1997,9 @@ fn make_schema_nullable(schema: &mut Value) {
                 arr.push("null".into());
                 map.insert("type".to_owned(), Value::Array(arr));
             }
-            _ => {}
+            _ => return false,
         }
-        return;
+        return true;
     }
 
     // Structured: split the schema into a typed variant (everything
@@ -1951,10 +2018,12 @@ fn make_schema_nullable(schema: &mut Value) {
             Value::Object(Map::from_iter([("type".to_owned(), "null".into())])),
         ]),
     );
+    true
 }
 
-fn convert_tools(tools: Vec<ToolDefinition>) -> Vec<types::Tool> {
-    tools
+fn convert_tools(tools: Vec<ToolDefinition>) -> (Vec<types::Tool>, ArgumentDecoders) {
+    let mut decoders = ArgumentDecoders::default();
+    let tools = tools
         .into_iter()
         .map(|tool| {
             // The strict subset requires a type on every property, which a
@@ -1963,15 +2032,18 @@ fn convert_tools(tools: Vec<ToolDefinition>) -> Vec<types::Tool> {
             // sending it strict costs the whole request, and every other tool
             // in it.
             let strict = !json_schema::has_unconstrained_node(&tool.parameters);
+            let (parameters, decoding) = parameters_with_decoding(&tool.parameters, strict);
+            decoders.insert(&tool.name, decoding);
 
             types::Tool::Function {
                 name: tool.name,
                 strict,
                 description: tool.docs.schema_description().map(str::to_owned),
-                parameters: parameters_with_strict_mode(&tool.parameters, strict).into(),
+                parameters: parameters.into(),
             }
         })
-        .collect()
+        .collect();
+    (tools, decoders)
 }
 
 /// Parse an OpenAI reasoning execution mode value (`standard` or `pro`).
diff --git a/crates/jp_llm/src/provider/openai_tests.rs b/crates/jp_llm/src/provider/openai_tests.rs
index 3ac6c7b8d..960ab20f2 100644
--- a/crates/jp_llm/src/provider/openai_tests.rs
+++ b/crates/jp_llm/src/provider/openai_tests.rs
@@ -328,7 +328,7 @@ mod convert_tools {
 
     /// One converted tool, as it goes on the wire.
     fn converted(parameters: serde_json::Value) -> serde_json::Value {
-        let tools = convert_tools(vec![ToolDefinition {
+        let (tools, _) = convert_tools(vec![ToolDefinition {
             name: "store".to_owned(),
             docs: ToolDocs::default(),
             parameters,
diff --git a/crates/jp_llm/src/provider/openrouter.rs b/crates/jp_llm/src/provider/openrouter.rs
index be47d0ca3..781fd1de1 100644
--- a/crates/jp_llm/src/provider/openrouter.rs
+++ b/crates/jp_llm/src/provider/openrouter.rs
@@ -43,9 +43,10 @@ use crate::{
     event::{self, Event, EventPart, ToolCallPart},
     event_builder::EventBuilder,
     model::ReasoningDetails as ModelReasoningDetails,
-    provider::{Provider, openai::parameters_with_strict_mode, trace_to_tmpfile},
+    provider::{Provider, openai::parameters_with_decoding, trace_to_tmpfile},
     query::ChatQuery,
     stream::with_tool_call_keepalive,
+    tool::{ToolDefinition, decoding::ArgumentDecoders},
 };
 
 static PROVIDER: ProviderId = ProviderId::Openrouter;
@@ -141,14 +142,15 @@ impl Provider for Openrouter {
         model: &ModelDetails,
         query: ChatQuery,
     ) -> Result<EventStream> {
-        let (request, is_structured, forced_tool_fallback) = create_request(model, query)?;
+        let (request, is_structured, forced_tool_fallback, decoders) =
+            create_request(model, query)?;
 
-        Ok(call(
+        Ok(decoders.attach(call(
             self.client.clone(),
             request,
             is_structured,
             forced_tool_fallback,
-        ))
+        )))
     }
 }
 
@@ -667,7 +669,7 @@ impl Openrouter {
         model: &ModelDetails,
         query: ChatQuery,
     ) -> Result<serde_json::Value> {
-        let (request, _, _) = create_request(model, query)?;
+        let (request, ..) = create_request(model, query)?;
         Ok(serde_json::to_value(request)?)
     }
 }
@@ -732,14 +734,40 @@ fn force_nudge(choice: &tool::ToolChoice) -> String {
     }
 }
 
+fn convert_tools(tools: Vec<ToolDefinition>) -> (Vec<Tool>, ArgumentDecoders) {
+    let mut decoders = ArgumentDecoders::default();
+    let tools = tools
+        .into_iter()
+        .map(|tool| {
+            let (parameters, decoding) = parameters_with_decoding(&tool.parameters, true);
+            decoders.insert(&tool.name, decoding);
+            Tool::Function {
+                function: ToolFunction {
+                    parameters,
+                    name: tool.name,
+                    description: tool.docs.schema_description().map(str::to_owned),
+                    strict: true,
+                },
+            }
+        })
+        .collect();
+    (tools, decoders)
+}
+
 /// Create the request for the OpenRouter API.
 ///
 /// Returns the request, whether structured output is active, and any fallback
-/// required because reasoning prevents a forced tool choice on the wire.
+/// required because reasoning prevents a forced tool choice on the wire,
+/// followed by the tool argument decoding plans.
 fn create_request(
     model: &ModelDetails,
     query: ChatQuery,
-) -> Result<(request::ChatCompletion, bool, Option<ForcedToolFallback>)> {
+) -> Result<(
+    request::ChatCompletion,
+    bool,
+    Option<ForcedToolFallback>,
+    ArgumentDecoders,
+)> {
     let ChatQuery {
         thread,
         tools,
@@ -766,17 +794,7 @@ fn create_request(
     let reasoning = model.custom_reasoning_config(parameters.reasoning);
 
     let mut messages: RequestMessages = (&model.id, thread).try_into()?;
-    let tools = tools
-        .into_iter()
-        .map(|tool| Tool::Function {
-            function: ToolFunction {
-                parameters: parameters_with_strict_mode(&tool.parameters, true),
-                name: tool.name,
-                description: tool.docs.schema_description().map(str::to_owned),
-                strict: true,
-            },
-        })
-        .collect::<Vec<_>>();
+    let (tools, decoders) = convert_tools(tools);
     let thinking_active = reasoning.is_some()
         || model
             .reasoning
@@ -852,6 +870,7 @@ fn create_request(
         },
         is_structured,
         forced_tool_fallback,
+        decoders,
     ))
 }
 
diff --git a/crates/jp_llm/src/provider/openrouter_tests.rs b/crates/jp_llm/src/provider/openrouter_tests.rs
index 3540ae7d9..6656dd6b2 100644
--- a/crates/jp_llm/src/provider/openrouter_tests.rs
+++ b/crates/jp_llm/src/provider/openrouter_tests.rs
@@ -170,7 +170,7 @@ fn request_preserves_integer_tool_parameter_type() -> Result {
         unreachable!();
     };
 
-    let (request, _, _) = create_request(&model, query)?;
+    let (request, ..) = create_request(&model, query)?;
     let request = serde_json::to_value(request)?;
 
     assert_eq!(
@@ -369,7 +369,7 @@ fn forced_tool_request(
     };
     model.reasoning = Some(reasoning);
 
-    let (request, _, fallback) = create_request(&model, query).unwrap();
+    let (request, _, fallback, _) = create_request(&model, query).unwrap();
     (request, fallback)
 }
 
diff --git a/crates/jp_llm/src/provider/tool_decoding_tests.rs b/crates/jp_llm/src/provider/tool_decoding_tests.rs
new file mode 100644
index 000000000..0d15bcd13
--- /dev/null
+++ b/crates/jp_llm/src/provider/tool_decoding_tests.rs
@@ -0,0 +1,302 @@
+use futures::{StreamExt as _, stream};
+use jp_config::{model::id::ProviderId, providers::llm::LlmProviderConfig};
+use jp_conversation::{ConversationStream, thread::ThreadBuilder};
+use jp_test::mock::{MockServer, POST};
+use serde_json::{Value, json};
+
+use super::{get_provider, openai::parameters_with_decoding};
+use crate::{
+    EventStream,
+    event::Event,
+    event_builder::EventBuilder,
+    model::ModelDetails,
+    query::ChatQuery,
+    tool::{ToolDefinition, ToolDocs, decoding::ArgumentDecoders},
+};
+
+async fn assemble(schema: &Value, strict: bool, arguments: &str) -> Value {
+    let (_parameters, decoding) = parameters_with_decoding(schema, strict);
+    let mut decoders = ArgumentDecoders::default();
+    decoders.insert("search", decoding);
+    let events: EventStream = stream::iter(vec![
+        Ok(Event::tool_call_start(0, "call_1", "search")),
+        Ok(Event::tool_call_args(0, arguments)),
+        Ok(Event::flush(0)),
+    ])
+    .boxed();
+    let mut events = decoders.attach(events);
+    let mut builder = EventBuilder::new();
+    let mut requests = vec![];
+    while let Some(event) = events.next().await {
+        match event.unwrap() {
+            Event::Part {
+                index,
+                part,
+                metadata,
+            } => builder.handle_part(index, part, metadata),
+            Event::Flush { index, metadata } => {
+                let event = builder.handle_flush(index, metadata).unwrap();
+                let request = event.into_tool_call_request().unwrap();
+                assert_eq!(request.id, "call_1");
+                assert_eq!(request.name, "search");
+                requests.push(Value::Object(request.arguments));
+            }
+            _ => panic!("unexpected event"),
+        }
+    }
+    assert_eq!(requests.len(), 1);
+    requests.remove(0)
+}
+
+#[tokio::test]
+async fn strict_tool_omission_round_trip() {
+    let schema = json!({
+        "type": "object",
+        "required": ["query"],
+        "properties": {
+            "query": {"type": "string"},
+            "kinds": {"type": "array", "items": {"type": "string"}, "default": ["Function"]},
+            "version": {"type": "string", "default": "latest"}
+        }
+    });
+    assert_eq!(
+        assemble(
+            &schema,
+            true,
+            r#"{"query":"parse_document","kinds":null,"version":null}"#
+        )
+        .await,
+        json!({"query": "parse_document"})
+    );
+}
+
+#[tokio::test]
+async fn strict_tool_preserves_source_nulls_and_explicit_values() {
+    let schema = json!({
+        "type": "object",
+        "required": ["required"],
+        "properties": {
+            "required": {"type": "string"},
+            "nullable": {"type": ["string", "null"], "default": "fallback"},
+            "union": {"anyOf": [{"type": "string"}, {"type": "null"}]},
+            "kinds": {"type": "array", "items": {"type": "string"}}
+        }
+    });
+    assert_eq!(
+        assemble(
+            &schema,
+            true,
+            r#"{"required":null,"nullable":null,"union":null,"kinds":[]}"#
+        )
+        .await,
+        json!({"required": null, "nullable": null, "union": null, "kinds": []})
+    );
+}
+
+#[tokio::test]
+async fn strict_tool_decodes_nested_objects_and_array_items() {
+    let schema = json!({
+        "type": "object",
+        "properties": {
+            "options": {"type": "object", "properties": {"limit": {"type": "integer"}}},
+            "rows": {"type": "array", "items": {
+                "type": "object", "properties": {"label": {"type": "string"}}
+            }}
+        }
+    });
+    assert_eq!(
+        assemble(
+            &schema,
+            true,
+            r#"{"options":{"limit":null},"rows":[{"label":null},{"label":"kept"},null]}"#
+        )
+        .await,
+        json!({"options": {}, "rows": [{}, {"label": "kept"}, null]})
+    );
+}
+
+const OPENAI_CALL: &str = r#"event: response.output_item.added
+data: {"type":"response.output_item.added","output_index":0,"sequence_number":0,"item":{"type":"function_call","id":"fc_1","call_id":"call_1","name":"search","arguments":""}}
+
+event: response.function_call_arguments.delta
+data: {"type":"response.function_call_arguments.delta","item_id":"fc_1","output_index":0,"sequence_number":1,"delta":"{\"query\":\"parse_document\",\"kinds\":null}"}
+
+event: response.output_item.done
+data: {"type":"response.output_item.done","output_index":0,"sequence_number":2,"item":{"type":"function_call","id":"fc_1","call_id":"call_1","name":"search","arguments":"{\"query\":\"parse_document\",\"kinds\":null}","status":"completed"}}
+
+"#;
+
+const CHAT_CALL: &str = r#"data: {"id":"chat_1","object":"chat.completion.chunk","created":0,"model":"test","provider":"test","choices":[{"index":0,"delta":{"role":"assistant","tool_calls":[{"index":0,"id":"call_1","type":"function","function":{"name":"search","arguments":"{\"query\":\"parse_document\",\"kinds\":null}"}}]},"finish_reason":null}]}
+
+data: {"id":"chat_1","object":"chat.completion.chunk","created":0,"model":"test","provider":"test","choices":[{"index":0,"delta":{},"finish_reason":"tool_calls"}]}
+
+data: [DONE]
+
+"#;
+
+async fn provider_round_trip(provider_id: ProviderId, body: &'static str, streaming: bool) {
+    let server = MockServer::start_async().await;
+    let endpoint = server
+        .mock_async(|when, then| {
+            when.method(POST);
+            then.status(200)
+                .header(
+                    "content-type",
+                    if streaming {
+                        "text/event-stream"
+                    } else {
+                        "application/json"
+                    },
+                )
+                .body(body);
+        })
+        .await;
+    let mut config = LlmProviderConfig::default();
+    let key_env = if cfg!(windows) { "USERNAME" } else { "USER" };
+    config.openai.api_key_env = key_env.to_owned();
+    config.openai.base_url_env = String::new();
+    config.openai.base_url = server.base_url();
+    config.openrouter.api_key_env = key_env.to_owned();
+    config.openrouter.base_url = server.base_url();
+    config.llamacpp.base_url = server.base_url();
+    let provider = get_provider(provider_id, &config).unwrap();
+    let mut model = ModelDetails::empty((provider_id, "test").try_into().unwrap());
+    if !streaming {
+        model.features.push("streaming_unsupported");
+    }
+    let thread = ThreadBuilder::new()
+        .with_events(ConversationStream::new_test().with_turn("search"))
+        .build()
+        .unwrap();
+    let mut query = ChatQuery::from(thread);
+    query.tools.push(ToolDefinition {
+        name: "search".to_owned(),
+        docs: ToolDocs::default(),
+        parameters: json!({
+            "type": "object", "required": ["query"],
+            "properties": {
+                "query": {"type": "string"},
+                "kinds": {"type": "array", "items": {"$ref": "#/$defs/Kind"}}
+            },
+            "$defs": {"Kind": {"type": "string", "enum": ["Function"]}}
+        }),
+    });
+    let mut events = provider
+        .chat_completion_stream(&model, query)
+        .await
+        .unwrap();
+    let mut builder = EventBuilder::new();
+    let mut requests = vec![];
+    while let Some(event) = events.next().await {
+        match event.unwrap() {
+            Event::Part {
+                index,
+                part,
+                metadata,
+            } => builder.handle_part(index, part, metadata),
+            Event::Flush { index, metadata } => {
+                if let Some(event) = builder.handle_flush(index, metadata) {
+                    assert!(event.metadata.is_empty());
+                    requests.push(event.into_tool_call_request().unwrap().arguments);
+                }
+            }
+            Event::Finished(_) | Event::KeepAlive => {}
+            Event::Patch(_) => panic!("unexpected patch"),
+        }
+    }
+    assert_eq!(endpoint.calls_async().await, 1);
+    assert_eq!(requests, vec![
+        json!({"query": "parse_document"})
+            .as_object()
+            .unwrap()
+            .clone()
+    ]);
+}
+
+#[tokio::test]
+async fn openai_decodes_before_tool_dispatch() {
+    provider_round_trip(ProviderId::Openai, OPENAI_CALL, true).await;
+}
+
+#[tokio::test]
+async fn openrouter_decodes_before_tool_dispatch() {
+    provider_round_trip(ProviderId::Openrouter, CHAT_CALL, true).await;
+}
+
+#[tokio::test]
+async fn llamacpp_decodes_before_tool_dispatch() {
+    provider_round_trip(ProviderId::Llamacpp, CHAT_CALL, true).await;
+}
+
+#[tokio::test]
+async fn openai_non_streaming_decodes_before_tool_dispatch() {
+    provider_round_trip(
+        ProviderId::Openai,
+        r#"{
+        "id": "resp_1", "object": "response", "created_at": 0,
+        "status": "completed", "model": "test", "error": null,
+        "incomplete_details": null, "instructions": null, "metadata": {},
+        "output": [{"type": "function_call", "id": "fc_1", "call_id": "call_1",
+            "name": "search", "arguments": "{\"query\":\"parse_document\",\"kinds\":null}",
+            "status": "completed"}],
+        "parallel_tool_calls": true, "temperature": 1, "top_p": 1,
+        "tool_choice": "auto", "tools": [], "usage": null,
+        "reasoning": {}, "text": {"format": {"type": "text"}},
+        "truncation": "disabled", "store": false
+    }"#,
+        false,
+    )
+    .await;
+}
+
+#[tokio::test]
+async fn reference_and_composition_paths_remain_undecoded() {
+    let schema = json!({
+        "type": "object",
+        "properties": {
+            "inline": {"type": "string"},
+            "referenced": {"$ref": "#/$defs/Options"},
+            "composed": {"anyOf": [
+                {"type": "object", "properties": {"value": {"type": "string"}}},
+                {"type": "object", "required": ["value"], "properties": {"value": {"type": "null"}}}
+            ]}
+        },
+        "$defs": {"Options": {"type": "object", "properties": {"value": {"type": "string"}}}}
+    });
+    assert_eq!(
+        assemble(
+            &schema,
+            true,
+            r#"{"inline":null,"referenced":{"value":null},"composed":{"value":null}}"#
+        )
+        .await,
+        json!({"referenced": {"value": null}, "composed": {"value": null}})
+    );
+}
+
+#[tokio::test]
+async fn nullable_object_preserves_null_but_decodes_its_properties() {
+    let schema = json!({
+        "type": "object", "properties": {
+            "absent": {"anyOf": [
+                {"type": "object", "properties": {"value": {"type": "string"}}}, {"type": "null"}
+            ]},
+            "present": {"anyOf": [
+                {"type": "object", "properties": {"value": {"type": "string"}}}, {"type": "null"}
+            ]}
+        }
+    });
+    assert_eq!(
+        assemble(&schema, true, r#"{"absent":null,"present":{"value":null}}"#).await,
+        json!({"absent": null, "present": {}})
+    );
+}
+
+#[tokio::test]
+async fn non_strict_tool_keeps_nulls() {
+    let schema = json!({"type": "object", "properties": {"query": {"type": "string"}}});
+    assert_eq!(
+        assemble(&schema, false, r#"{"query":null}"#).await,
+        json!({"query": null})
+    );
+}
diff --git a/crates/jp_llm/src/stream.rs b/crates/jp_llm/src/stream.rs
index 3fb887bf0..c12c9725d 100644
--- a/crates/jp_llm/src/stream.rs
+++ b/crates/jp_llm/src/stream.rs
@@ -164,7 +164,7 @@ fn content_byte_size(item: &Result<Event, StreamError>) -> u64 {
                 | EventPart::Reasoning(text)
                 | EventPart::Structured(text) => text.len(),
                 EventPart::ToolCall(ToolCallPart::ArgumentChunk(json)) => json.len(),
-                EventPart::ToolCall(ToolCallPart::Start { id, name }) => id.len() + name.len(),
+                EventPart::ToolCall(ToolCallPart::Start { id, name, .. }) => id.len() + name.len(),
             };
 
             content + metadata_byte_size(metadata)
diff --git a/crates/jp_llm/src/tool.rs b/crates/jp_llm/src/tool.rs
index da9db388f..ff21bf5d3 100644
--- a/crates/jp_llm/src/tool.rs
+++ b/crates/jp_llm/src/tool.rs
@@ -1,6 +1,7 @@
 //! Tool call utilities.
 
 pub mod builtin;
+pub mod decoding;
 pub mod executor;
 pub mod json_schema;
 
diff --git a/crates/jp_llm/src/tool/decoding.rs b/crates/jp_llm/src/tool/decoding.rs
new file mode 100644
index 000000000..afb11cb5b
--- /dev/null
+++ b/crates/jp_llm/src/tool/decoding.rs
@@ -0,0 +1,91 @@
+//! Request-local instructions for decoding provider tool arguments.
+//!
+//! Providers attach a plan to a tool call's start.
+//! The event builder applies it to the completed JSON object before
+//! constructing the tool call request.
+
+use std::{collections::BTreeMap, sync::Arc};
+
+use futures::StreamExt as _;
+use serde_json::{Map, Value};
+
+use crate::{
+    EventStream,
+    event::{Event, EventPart, ToolCallPart},
+};
+
+/// Removes null placeholders introduced by a provider's schema encoding.
+///
+/// This is transient request state, not part of a persisted tool call.
+/// Fields not named by the plan retain their values, including explicit nulls.
+#[derive(Debug, Clone, Default, PartialEq)]
+pub struct ArgumentDecoding {
+    pub(crate) omit_null: Vec<String>,
+    pub(crate) properties: BTreeMap<String, Self>,
+    pub(crate) items: Option<Box<Self>>,
+}
+
+impl ArgumentDecoding {
+    pub(crate) fn is_empty(&self) -> bool {
+        self.omit_null.is_empty() && self.properties.is_empty() && self.items.is_none()
+    }
+
+    pub(crate) fn apply(&self, arguments: &mut Map<String, Value>) {
+        for name in &self.omit_null {
+            if arguments.get(name) == Some(&Value::Null) {
+                arguments.remove(name);
+            }
+        }
+        for (name, plan) in &self.properties {
+            if let Some(value) = arguments.get_mut(name) {
+                plan.apply_value(value);
+            }
+        }
+    }
+
+    fn apply_value(&self, value: &mut Value) {
+        match value {
+            Value::Object(arguments) => self.apply(arguments),
+            Value::Array(values) => {
+                if let Some(items) = &self.items {
+                    for value in values {
+                        items.apply_value(value);
+                    }
+                }
+            }
+            _ => {}
+        }
+    }
+}
+
+/// Decoding plans for the tools advertised in one provider request.
+#[derive(Debug, Default)]
+pub(crate) struct ArgumentDecoders(BTreeMap<String, Arc<ArgumentDecoding>>);
+
+impl ArgumentDecoders {
+    pub(crate) fn insert(&mut self, name: &str, plan: ArgumentDecoding) {
+        if !plan.is_empty() {
+            self.0.insert(name.to_owned(), Arc::new(plan));
+        }
+    }
+
+    /// Attach plans without buffering or changing generated argument chunks.
+    pub(crate) fn attach(self, stream: EventStream) -> EventStream {
+        stream
+            .map(move |mut event| {
+                if let Ok(Event::Part {
+                    part: EventPart::ToolCall(ToolCallPart::Start { name, decoding, .. }),
+                    ..
+                }) = &mut event
+                {
+                    *decoding = self.0.get(name).cloned();
+                }
+                event
+            })
+            .boxed()
+    }
+}
+
+#[cfg(test)]
+#[path = "decoding_tests.rs"]
+mod tests;
diff --git a/crates/jp_llm/src/tool/decoding_tests.rs b/crates/jp_llm/src/tool/decoding_tests.rs
new file mode 100644
index 000000000..62aea2666
--- /dev/null
+++ b/crates/jp_llm/src/tool/decoding_tests.rs
@@ -0,0 +1,115 @@
+use futures::{StreamExt as _, stream};
+use serde_json::{Map, Value, json};
+
+use super::*;
+use crate::{StreamError, StreamErrorKind, event::FinishReason, event_builder::EventBuilder};
+
+#[tokio::test]
+async fn plans_follow_tool_names_across_interleaved_calls() {
+    let mut decoders = ArgumentDecoders::default();
+    decoders.insert("search", ArgumentDecoding {
+        omit_null: vec!["kinds".to_owned()],
+        ..ArgumentDecoding::default()
+    });
+    let mut events = decoders.attach(
+        stream::iter(vec![
+            Ok(Event::tool_call_start(0, "call_1", "search")),
+            Ok(Event::tool_call_start(1, "call_2", "other")),
+            Ok(Event::tool_call_args(0, r#"{"kinds":"#)),
+            Ok(Event::tool_call_args(1, r#"{"kinds":null}"#)),
+            Ok(Event::tool_call_start(0, "ignored", "other")),
+            Ok(Event::tool_call_args(0, "null}")),
+            Ok(Event::flush(1)),
+            Ok(Event::flush(0)),
+        ])
+        .boxed(),
+    );
+    let mut builder = EventBuilder::new();
+    let mut calls = vec![];
+    while let Some(event) = events.next().await {
+        match event.unwrap() {
+            Event::Part {
+                index,
+                part,
+                metadata,
+            } => builder.handle_part(index, part, metadata),
+            Event::Flush { index, metadata } => {
+                let event = builder.handle_flush(index, metadata).unwrap();
+                assert_eq!(event.metadata, Map::new());
+                let call = event.into_tool_call_request().unwrap();
+                calls.push(json!({"id": call.id, "name": call.name, "arguments": call.arguments}));
+            }
+            _ => panic!("unexpected event"),
+        }
+    }
+    assert_eq!(calls, vec![
+        json!({"id": "call_2", "name": "other", "arguments": {"kinds": null}}),
+        json!({"id": "call_1", "name": "search", "arguments": {}}),
+    ]);
+}
+
+#[tokio::test]
+async fn decoding_does_not_hide_chunks_errors_or_incomplete_calls() {
+    let mut decoders = ArgumentDecoders::default();
+    decoders.insert("search", ArgumentDecoding {
+        omit_null: vec!["kinds".to_owned()],
+        ..ArgumentDecoding::default()
+    });
+    let mut events = decoders.attach(
+        stream::iter(vec![
+            Ok(Event::tool_call_start(0, "call_1", "search")),
+            Ok(Event::tool_call_args(0, r#"{"kinds":n"#)),
+            Err(StreamError::timeout("fixture timeout")),
+            Ok(Event::Finished(FinishReason::MaxTokens)),
+        ])
+        .boxed(),
+    );
+    let mut builder = EventBuilder::new();
+    let Event::Part {
+        index,
+        part,
+        metadata,
+    } = events.next().await.unwrap().unwrap()
+    else {
+        panic!("expected start");
+    };
+    builder.handle_part(index, part, metadata);
+    let chunk = events.next().await.unwrap().unwrap();
+    assert_eq!(chunk, Event::tool_call_args(0, r#"{"kinds":n"#));
+    let Event::Part {
+        index,
+        part,
+        metadata,
+    } = chunk
+    else {
+        panic!("expected chunk");
+    };
+    builder.handle_part(index, part, metadata);
+    let error = events.next().await.unwrap().unwrap_err();
+    assert_eq!(error.kind, StreamErrorKind::Timeout);
+    assert_eq!(error.message(), "fixture timeout");
+    assert_eq!(
+        events.next().await.unwrap().unwrap(),
+        Event::Finished(FinishReason::MaxTokens)
+    );
+    assert!(events.next().await.is_none());
+    assert_eq!(builder.incomplete_tool_calls(), vec!["search"]);
+    assert_eq!(builder.drain(), vec![]);
+}
+
+#[test]
+fn explicit_values_are_preserved() {
+    let plan = ArgumentDecoding {
+        omit_null: vec!["kinds".to_owned()],
+        ..ArgumentDecoding::default()
+    };
+    let mut arguments = json!({"kinds": ["Function"], "nullable": null})
+        .as_object()
+        .unwrap()
+        .clone();
+    plan.apply(&mut arguments);
+    assert_eq!(
+        Value::Object(arguments),
+        json!({"kinds": ["Function"], "nullable": null})
+    );
+}
diff --git a/crates/jp_llm/tests/fixtures/anthropic/test_fable_5_forced_tool_soft_forces__raw_events.snap b/crates/jp_llm/tests/fixtures/anthropic/test_fable_5_forced_tool_soft_forces__raw_events.snap
index 536d06c7d..5173db49e 100644
--- a/crates/jp_llm/tests/fixtures/anthropic/test_fable_5_forced_tool_soft_forces__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/anthropic/test_fable_5_forced_tool_soft_forces__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,7 @@ expression: v
                 Start {
                     id: "toolu_01DYRwPNeF44tkkTHK9GZLXv",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/anthropic/test_multi_turn_conversation__raw_events.snap b/crates/jp_llm/tests/fixtures/anthropic/test_multi_turn_conversation__raw_events.snap
index 8fa1d01b0..aac5f3e16 100644
--- a/crates/jp_llm/tests/fixtures/anthropic/test_multi_turn_conversation__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/anthropic/test_multi_turn_conversation__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -99,6 +100,7 @@ expression: v
                 Start {
                     id: "toolu_01XwmS4LqFiZwtZ7Myyhc48y",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_auto__raw_events.snap b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_auto__raw_events.snap
index e547eb9ed..258cf4fa2 100644
--- a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_auto__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_auto__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,7 @@ expression: v
                 Start {
                     id: "toolu_01JAHJz5uuvrjHRutexsopKE",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_function__raw_events.snap b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_function__raw_events.snap
index 06a06821a..56b12fc1e 100644
--- a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_function__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_function__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,7 @@ expression: v
                 Start {
                     id: "toolu_015nmxweBaM2MUfdypoenU31",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_reasoning__raw_events.snap
index d3a0c3a1f..f6830b2f3 100644
--- a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -129,6 +130,7 @@ expression: v
                 Start {
                     id: "toolu_01R35dJ1FaGkcNPmGqF2NfSA",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_required_no_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_required_no_reasoning__raw_events.snap
index 93423f07d..a8fa82f4f 100644
--- a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_required_no_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_required_no_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,7 @@ expression: v
                 Start {
                     id: "toolu_019hRf3U5xzJoV7ufpEPgXT2",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_required_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_required_reasoning__raw_events.snap
index 9ff6ca97f..5980714be 100644
--- a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_required_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_required_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -80,6 +81,7 @@ expression: v
                 Start {
                     id: "toolu_015TdjGwt7Sj5EmKZmHcjmqC",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_stream__raw_events.snap b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_stream__raw_events.snap
index 9b939162b..a2a864faa 100644
--- a/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_stream__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/anthropic/test_tool_call_stream__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,7 @@ expression: v
                 Start {
                     id: "toolu_0133DM77y4tmYgkWRtGNPpxa",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/cerebras/test_multi_turn_conversation__raw_events.snap b/crates/jp_llm/tests/fixtures/cerebras/test_multi_turn_conversation__raw_events.snap
index 7e4674584..982c1bb56 100644
--- a/crates/jp_llm/tests/fixtures/cerebras/test_multi_turn_conversation__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/cerebras/test_multi_turn_conversation__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -250,6 +251,7 @@ expression: v
                 Start {
                     id: "0bb7d840a",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_auto__raw_events.snap b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_auto__raw_events.snap
index 9d331c4b9..3a61bd820 100644
--- a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_auto__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_auto__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -84,6 +85,7 @@ expression: v
                 Start {
                     id: "ad7b0fd0d",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_function__raw_events.snap b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_function__raw_events.snap
index ad9126d8b..645485e07 100644
--- a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_function__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_function__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -84,6 +85,7 @@ expression: v
                 Start {
                     id: "ebed658c3",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_reasoning__raw_events.snap
index 6ef4d08ca..833cf3c53 100644
--- a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -35,6 +36,7 @@ expression: v
                 Start {
                     id: "f8afbdfcc",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_required_no_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_required_no_reasoning__raw_events.snap
index 467ce0041..69c8dd113 100644
--- a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_required_no_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_required_no_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -84,6 +85,7 @@ expression: v
                 Start {
                     id: "9ad7c9ddd",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_required_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_required_reasoning__raw_events.snap
index 8ce0d3538..4f7d48707 100644
--- a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_required_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_required_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -35,6 +36,7 @@ expression: v
                 Start {
                     id: "885f4bbdf",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_stream__raw_events.snap b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_stream__raw_events.snap
index 3a79bf081..4f96e6d46 100644
--- a/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_stream__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/cerebras/test_tool_call_stream__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -91,6 +92,7 @@ expression: v
                 Start {
                     id: "08d59c72f",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/google/test_multi_turn_conversation__raw_events.snap b/crates/jp_llm/tests/fixtures/google/test_multi_turn_conversation__raw_events.snap
index 2e0dc9dc2..fa62c57d5 100644
--- a/crates/jp_llm/tests/fixtures/google/test_multi_turn_conversation__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/google/test_multi_turn_conversation__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -53,6 +54,7 @@ expression: v
                 Start {
                     id: "run_me_0",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {
diff --git a/crates/jp_llm/tests/fixtures/google/test_tool_call_auto__raw_events.snap b/crates/jp_llm/tests/fixtures/google/test_tool_call_auto__raw_events.snap
index 09cd89b2e..40b1c46c8 100644
--- a/crates/jp_llm/tests/fixtures/google/test_tool_call_auto__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/google/test_tool_call_auto__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,7 @@ expression: v
                 Start {
                     id: "run_me_0",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {
diff --git a/crates/jp_llm/tests/fixtures/google/test_tool_call_function__raw_events.snap b/crates/jp_llm/tests/fixtures/google/test_tool_call_function__raw_events.snap
index 6e5f44456..c781b310a 100644
--- a/crates/jp_llm/tests/fixtures/google/test_tool_call_function__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/google/test_tool_call_function__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,7 @@ expression: v
                 Start {
                     id: "run_me_0",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {
diff --git a/crates/jp_llm/tests/fixtures/google/test_tool_call_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/google/test_tool_call_reasoning__raw_events.snap
index c6ad98fde..9e5500347 100644
--- a/crates/jp_llm/tests/fixtures/google/test_tool_call_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/google/test_tool_call_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -28,6 +29,7 @@ expression: v
                 Start {
                     id: "run_me_1",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {
diff --git a/crates/jp_llm/tests/fixtures/google/test_tool_call_required_no_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/google/test_tool_call_required_no_reasoning__raw_events.snap
index 2da957bb1..712a30538 100644
--- a/crates/jp_llm/tests/fixtures/google/test_tool_call_required_no_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/google/test_tool_call_required_no_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,7 @@ expression: v
                 Start {
                     id: "run_me_0",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {
diff --git a/crates/jp_llm/tests/fixtures/google/test_tool_call_required_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/google/test_tool_call_required_reasoning__raw_events.snap
index 193f1aa2a..3b69db2c0 100644
--- a/crates/jp_llm/tests/fixtures/google/test_tool_call_required_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/google/test_tool_call_required_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -28,6 +29,7 @@ expression: v
                 Start {
                     id: "run_me_1",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {
diff --git a/crates/jp_llm/tests/fixtures/google/test_tool_call_stream__raw_events.snap b/crates/jp_llm/tests/fixtures/google/test_tool_call_stream__raw_events.snap
index ed48bdc05..d516aca1c 100644
--- a/crates/jp_llm/tests/fixtures/google/test_tool_call_stream__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/google/test_tool_call_stream__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,7 @@ expression: v
                 Start {
                     id: "run_me_0",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {
diff --git a/crates/jp_llm/tests/fixtures/llamacpp/test_multi_turn_conversation__raw_events.snap b/crates/jp_llm/tests/fixtures/llamacpp/test_multi_turn_conversation__raw_events.snap
index 35ec6b84f..935792fdb 100644
--- a/crates/jp_llm/tests/fixtures/llamacpp/test_multi_turn_conversation__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/llamacpp/test_multi_turn_conversation__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -1923,6 +1924,15 @@ expression: v
                 Start {
                     id: "3025kzfSjn1Q76fmpkjrrvhmMOFjumOt",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_auto__raw_events.snap b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_auto__raw_events.snap
index 8ba92a7a8..51cdf7920 100644
--- a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_auto__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_auto__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -14,6 +15,15 @@ expression: v
                 Start {
                     id: "XKlv3S6qUhMOu2TFBjOi50mehedlfHVg",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_function__raw_events.snap b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_function__raw_events.snap
index 0cb60e311..64dcdf46a 100644
--- a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_function__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_function__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -14,6 +15,15 @@ expression: v
                 Start {
                     id: "10C5kzdXGxswu3Mf4kc59YGXJwe2Wh6Q",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_reasoning__raw_events.snap
index 81d173729..a23a67540 100644
--- a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -833,6 +834,15 @@ expression: v
                 Start {
                     id: "qCRtO6khmonFfDo1uuz8gSBVczLWJhCp",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_required_no_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_required_no_reasoning__raw_events.snap
index 09d41092a..e07b320bd 100644
--- a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_required_no_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_required_no_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -14,6 +15,15 @@ expression: v
                 Start {
                     id: "YVmI1CdVad59bsgXRfMOXYcxpo9gAv88",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_required_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_required_reasoning__raw_events.snap
index 64edb2d30..fe273138d 100644
--- a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_required_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_required_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -1036,6 +1037,15 @@ expression: v
                 Start {
                     id: "n19Zg7uRIClo8uT6BobGdBU6pPoBmbMu",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_stream__raw_events.snap b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_stream__raw_events.snap
index dc6456595..d8efbdb59 100644
--- a/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_stream__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/llamacpp/test_tool_call_stream__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -14,6 +15,15 @@ expression: v
                 Start {
                     id: "FpyxzrUobenAo9FIhFP3Z8FnxbvMV4L9",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/ollama/test_multi_turn_conversation__raw_events.snap b/crates/jp_llm/tests/fixtures/ollama/test_multi_turn_conversation__raw_events.snap
index a4963dec1..9a785a366 100644
--- a/crates/jp_llm/tests/fixtures/ollama/test_multi_turn_conversation__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/ollama/test_multi_turn_conversation__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -103059,6 +103060,7 @@ expression: v
                 Start {
                     id: "run_me_2",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_auto__raw_events.snap b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_auto__raw_events.snap
index 957c09833..55fcae839 100644
--- a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_auto__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_auto__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -14,6 +15,7 @@ expression: v
                 Start {
                     id: "run_me_2",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_function__raw_events.snap b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_function__raw_events.snap
index bb9288dec..cbcba472e 100644
--- a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_function__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_function__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -14,6 +15,7 @@ expression: v
                 Start {
                     id: "run_me_2",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_reasoning__raw_events.snap
index bdbb83183..dc0707fe2 100644
--- a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -1736,6 +1737,7 @@ expression: v
                 Start {
                     id: "run_me_2",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_required_no_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_required_no_reasoning__raw_events.snap
index e05853177..3debbe294 100644
--- a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_required_no_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_required_no_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -14,6 +15,7 @@ expression: v
                 Start {
                     id: "run_me_2",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_required_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_required_reasoning__raw_events.snap
index 02372d67b..aaa3b866f 100644
--- a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_required_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_required_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -1645,6 +1646,7 @@ expression: v
                 Start {
                     id: "run_me_2",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_stream__raw_events.snap b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_stream__raw_events.snap
index d1a3d3963..929da8d03 100644
--- a/crates/jp_llm/tests/fixtures/ollama/test_tool_call_stream__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/ollama/test_tool_call_stream__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -14,6 +15,7 @@ expression: v
                 Start {
                     id: "run_me_2",
                     name: "run_me",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openai/test_multi_turn_conversation__raw_events.snap b/crates/jp_llm/tests/fixtures/openai/test_multi_turn_conversation__raw_events.snap
index fa16b006a..8043857cf 100644
--- a/crates/jp_llm/tests/fixtures/openai/test_multi_turn_conversation__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openai/test_multi_turn_conversation__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -697,6 +698,15 @@ expression: v
                 Start {
                     id: "call_aGqFUSwEmeqvj7EMW7rPrTsW",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openai/test_tool_call_auto__raw_events.snap b/crates/jp_llm/tests/fixtures/openai/test_tool_call_auto__raw_events.snap
index 72b1c84c5..ff202998a 100644
--- a/crates/jp_llm/tests/fixtures/openai/test_tool_call_auto__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openai/test_tool_call_auto__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,15 @@ expression: v
                 Start {
                     id: "call_9pIO9rxD5iBgHYWii3HGpW8u",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openai/test_tool_call_function__raw_events.snap b/crates/jp_llm/tests/fixtures/openai/test_tool_call_function__raw_events.snap
index fab321309..0d64eb201 100644
--- a/crates/jp_llm/tests/fixtures/openai/test_tool_call_function__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openai/test_tool_call_function__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,15 @@ expression: v
                 Start {
                     id: "call_O3ByNtUdUxXx7MatyW9beYgO",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openai/test_tool_call_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/openai/test_tool_call_reasoning__raw_events.snap
index 0a309ea52..e30b41704 100644
--- a/crates/jp_llm/tests/fixtures/openai/test_tool_call_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openai/test_tool_call_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -24,6 +25,15 @@ expression: v
                 Start {
                     id: "call_S4y869TTmCcKjpUrCzlx64iI",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_no_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_no_reasoning__raw_events.snap
index b139a39e2..66df76ca8 100644
--- a/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_no_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_no_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,15 @@ expression: v
                 Start {
                     id: "call_JJxtV1WBiRq4s9iMKiH2Hv5s",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openai/test_tool_call_stream__raw_events.snap b/crates/jp_llm/tests/fixtures/openai/test_tool_call_stream__raw_events.snap
index 99775e0c3..ee29dc047 100644
--- a/crates/jp_llm/tests/fixtures/openai/test_tool_call_stream__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openai/test_tool_call_stream__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -10,6 +11,15 @@ expression: v
                 Start {
                     id: "call_QVPVzLo15uyHKtD1NPj8MGFL",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openrouter/test_anthropic_opus_5_parallel_tool_round_trip__raw_events.snap b/crates/jp_llm/tests/fixtures/openrouter/test_anthropic_opus_5_parallel_tool_round_trip__raw_events.snap
index 57463f722..0f2194679 100644
--- a/crates/jp_llm/tests/fixtures/openrouter/test_anthropic_opus_5_parallel_tool_round_trip__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openrouter/test_anthropic_opus_5_parallel_tool_round_trip__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -24,6 +25,7 @@ expression: v
                 Start {
                     id: "toolu_01Uo9BabQqLmAaDofViBHLT3",
                     name: "list_items",
+                    decoding: None,
                 },
             ),
             metadata: {},
@@ -61,6 +63,7 @@ expression: v
                 Start {
                     id: "toolu_01KpNDwzcdeVXYC3VR9x8Rcu",
                     name: "search_items",
+                    decoding: None,
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openrouter/test_multi_turn_conversation__raw_events.snap b/crates/jp_llm/tests/fixtures/openrouter/test_multi_turn_conversation__raw_events.snap
index b8610a607..8051d6348 100644
--- a/crates/jp_llm/tests/fixtures/openrouter/test_multi_turn_conversation__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openrouter/test_multi_turn_conversation__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -196,6 +197,15 @@ expression: v
                 Start {
                     id: "call_ASyCmpktnp9V9J73QldUIcMS",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_auto__raw_events.snap b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_auto__raw_events.snap
index c65cd31b8..015e30894 100644
--- a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_auto__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_auto__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -26,6 +27,15 @@ expression: v
                 Start {
                     id: "call_LpP8nONS14vigHaa7spwH7CP",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_function__raw_events.snap b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_function__raw_events.snap
index be1f72bbe..b2336f0b3 100644
--- a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_function__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_function__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -26,6 +27,15 @@ expression: v
                 Start {
                     id: "call_hc6YFtXUxRuIeZQJpV6PxwL1",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_reasoning__raw_events.snap
index 172d9ec0d..a0c447cfe 100644
--- a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -26,6 +27,15 @@ expression: v
                 Start {
                     id: "call_rOan8lBVArGt59QeqLVYGJRB",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_no_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_no_reasoning__raw_events.snap
index d3d53ab15..e4de99bef 100644
--- a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_no_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_no_reasoning__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -26,6 +27,15 @@ expression: v
                 Start {
                     id: "call_WKBmpxCWQlHgotW4KaaM3jsY",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_stream__raw_events.snap b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_stream__raw_events.snap
index 7c661c62d..93df8cb08 100644
--- a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_stream__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_stream__raw_events.snap
@@ -1,5 +1,6 @@
 ---
 source: crates/jp_test/src/mock.rs
+assertion_line: 134
 expression: v
 ---
 [
@@ -26,6 +27,15 @@ expression: v
                 Start {
                     id: "call_tCr2HKeu326bnT2x94xswLYz",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
diff --git a/docs/ticket/063sw1z-enforce-resolved-tool-argument-constraints-before-every-disp.md b/docs/ticket/063sw1z-enforce-resolved-tool-argument-constraints-before-every-disp.md
index 98f49dbd0..bc35dd80a 100644
--- a/docs/ticket/063sw1z-enforce-resolved-tool-argument-constraints-before-every-disp.md
+++ b/docs/ticket/063sw1z-enforce-resolved-tool-argument-constraints-before-every-disp.md
@@ -39,3 +39,25 @@ Acceptance criteria:
 - Add tests using invalid calls taken from the Cerebras, Google, and llama.cpp
   fixtures.
 - Add tests proving MCP and built-in parameter overrides are enforced.
+
+## Comments
+
+-----
+
+- **From**: jp
+- **Date**: 2026-09-11T09:24:02Z
+
+Implemented the strict-provider omission-decoding portion in the working tree:
+request-local plans are produced by schema conversion, attached to transient
+tool-call starts, and consumed by EventBuilder before constructing
+ToolCallRequest.
+OpenAI (streaming and non-streaming), OpenRouter, and llama.cpp are wired.
+Source-nullable values and required properties are preserved; no generic null
+repair or MCP default injection was added.
+
+Reference and general composition decoding remains explicitly deferred to
+T-0h28vbn.
+Shared dispatch validation and default-policy work in this ticket remain open.
+
+The new decoding tests were observed failing before the fix and pass after it.
+Existing strict-schema, event-builder, and CLI turn-loop tests pass.
diff --git a/docs/ticket/0h28vbn-decode-strict-tool-omissions-through-references-and-composed.md b/docs/ticket/0h28vbn-decode-strict-tool-omissions-through-references-and-composed.md
new file mode 100644
index 000000000..57fa2b51e
--- /dev/null
+++ b/docs/ticket/0h28vbn-decode-strict-tool-omissions-through-references-and-composed.md
@@ -0,0 +1,37 @@
+# Decode strict-tool omissions through references and composed schemas
+
+- **Status**: Todo
+- **Kind**: Bug
+- **Authors**: jp
+- **Date**: 2026-09-11
+- **Label**: domain=llm
+- **Label**: package=jp_llm
+- **Label**: type=follow-up
+
+Strict-provider tool argument decoding currently covers inline properties,
+nested objects, array items, and a simple anyOf nullable wrapper.
+It deliberately leaves decoding paths through `$ref`, `allOf`, `oneOf`, and
+general `anyOf` unions untouched.
+An optional inline array whose item schema uses `$ref` can still be omitted; the
+gap is decoding within the referenced schema or an optional property itself
+declared through a reference.
+
+Address this in a separate PR that reviews reference resolution and composition
+handling together across the existing schema reader and strict-provider
+conversion.
+Do not introduce a second reference resolver solely for argument decoding.
+
+Preserve source-accepted null values and required fields.
+Record omission instructions only where the outgoing provider encoding actually
+introduces an omission placeholder.
+Cover shared and recursive definitions, reference siblings, escaped JSON
+pointers, and branch-dependent property requirements.
+Keep the source schema unchanged and pin provider schema output alongside
+decoded argument outcomes.
+
+The existing strict converter also cannot inject nullability into a standalone
+`$ref` or an untyped general union.
+Review that encoding gap together with decoding rather than treating every null
+at a referenced optional property as omission.
+
+Related: T-063sw1z (shared argument validation).

From fc412af16be97e1fc3554e10c2a7d215ad1cf6ca Mon Sep 17 00:00:00 2001
From: Jean Mertz <git@jeanmertz.com>
Date: Fri, 11 Sep 2026 12:50:34 +0200
Subject: [PATCH 2/2] fixup! fix(llm, openai, openrouter, llamacpp): Decode
 nulls

Signed-off-by: Jean Mertz <git@jeanmertz.com>
---
 .../test_tool_call_required_reasoning.snap    |  14 +-
 .../test_tool_call_required_reasoning.yml     | 365 ++--------
 ...quired_reasoning__conversation_stream.snap |  16 +-
 ...l_call_required_reasoning__raw_events.snap | 679 +-----------------
 .../test_tool_call_required_reasoning.snap    |  13 +-
 .../test_tool_call_required_reasoning.yml     | 138 ++--
 ...quired_reasoning__conversation_stream.snap |  15 +-
 ...l_call_required_reasoning__raw_events.snap | 216 ++----
 8 files changed, 205 insertions(+), 1251 deletions(-)

diff --git a/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning.snap b/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning.snap
index 0189862ab..1c0fc98eb 100644
--- a/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning.snap
+++ b/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning.snap
@@ -9,12 +9,12 @@ expression: v
                 timestamp: 2020-01-01 0:00:00.0 +00,
                 kind: ChatResponse(
                     Reasoning {
-                        reasoning: "**Analyzing tool call options**\n\nI need to call a tool, specifically functions.run_me, which requires setting the \"bar\" parameter as \"foo,\" but \"foo\" can be null or a string. I’m considering whether to use multi_tool_use.parallel for multiple calls, but it only works for functions tools. Since it seems simpler, I'll just call functions.run_me directly and use the commentary channel for this. My plan is to call it with \"foo\" set to null.",
+                        reasoning: "",
                     },
                 ),
                 metadata: {
-                    "openai_item_id": String("rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27"),
-                    "openai_encrypted_content": String("gAAAAABqiG2xnaWTAwVx7x04cr5y6QDQVOvd0elZQTGi27BcEUr3BIG0OaUr9VTFqfuknzmuUOavCeWmcVTREMX-RQg5Y8TrIutPPGnT7yBlav4wNbnt0YEw_xf-TD5pHla9ZMNaMkxEDkfqfBVpc_y22tSXK4bku-LzAqdkjwX6dVehYXW0RYScYXn0iyPNoObad6kD74ijzhATuTjGtzH-l4aXN2L-7cVy5HmNo15lm_XSwyyya1NN7_Ao-i9yl8C7rKi9GvZwSsuT34h8RL5jRxiBx6-pTir687fabzxY4yh4XwnmUFFn_VWahwklsH_w7K5as_fT4LkDffQsY8xl9tM_yALD3iRcobeE_EXGZvbBmyC7X2s19Q5LCSYKMsWS15c6sYQNUSMQE5fCyOIxruJbDzTBwRdFKM9ZAM5UaY8QZYFXKpQpKQ-KnzSCyj7JFiohHNVnrGnQ0kRmtO759gRah49w1sait_tY2UKhS6DP18XDOw1PlznJTNto_uDNLSxNZg6z87wbu1jbuT2EBeiPXQ_hXrRk0HbFo6cx3W8YdAoIBJaFZS-3o6NhtHmLdsv2x2pH54AZ9VIz2lLS2J5E5O3bwKSRPAFu8PPAyKNZrs3oZe6LxXburqbNDtn_-9P2SEPLy_LJLDTBtoumsI3OWhxI-2-z8YIzdXjM1hqY_klki_nQDxRZTeRA2PHT7i_0mGEB2m16fId4AuNrRRetO_GBW55Tq1pNddZTNrPVEX9iT2CM5OB5fI6mV9kxAnxIszBMC8ffsho3FUgTpdyBjDn0Rw6PpDCBg543CV2QR_1rGujxMUqgLdydxT5VM0QlnoiWS9KcMZssvCCwkGvjXJjllynbNWuuK62K9IWXV3skFXXD5wuc2LbzbcwUczDzkeO0Bbu6et-P4fRDd5ZxMFz_uzE1ZK1MHIpQ0kX_DDsFi1frDziQ9yi4pXg7j4S1IoyCSXwqEQDf7KTnVW1KU70J1SLND_5dxNk_UZDRVvHItBHwykE1udDh-4xB_YUX9ifWM0NI6QkCoG1HgwdTQY_l3rxLDG4ISE5arr_Tw5CjfhpX19wBwPhqtB3ESeQH6utkPkKg1Z2A7ouf2VbXkV6prHR9sNmOrAe2RvZzqRor4cft3TfHVp-euRKDL3iPVjrwLC-OVsHPGniIiS6U3wsdi67JDEQrLoparVTSIMi3A8NMed371UrjLWlGGfICGJPy6TV9YJzQx4zhFhTNvueKBZrMlts8DF9GVKqv8UDsfxEW_xxIGkSwSl2UjmRzkFEWLGov-q5D_g7_0cEFCN2bo3ui5AZI5lv12EoM7P9pbORxh71hT0cn7GTm7Avl1_lJdlBhlSu1-pT_jWgpJAtem_6T0sUrB9kcgu3jFJbWhuD6KM1ZG_0xB35F-u7UzKO1H4yVlWQDMTje3OXZwpFE7fhVwTWHfa80EriyB9ZHKMdAkNI0baeB59lZrx1FPu9YLxvtp0793KLM4J7_qIKJhp0ZVR4Dxy9UE1lInJUXeqTN0mm5t3fBN6HayQjxZ-P5P-gbXm8xUxgrP69PvdBb32Hggs4hzw0KwGRsRED-nR_PVY5MTGILs7mV_Me9EPLrisJdAqE0d3Km7zrc643HY9_rpuLiAzqxr35ZbP8pzkCQlXoxPB-Zam_pxq8EJ1RoX3BGukvoo1D83VulqsCFS_yQpUat-mq40nNfeSquHs0="),
+                    "openai_item_id": String("rs_025af4c5cac58077016aa3da898c1c87d2884e863491b22f1e"),
+                    "openai_encrypted_content": String("gAAAAABqo9qNBxdNxVsQFw3IkPtx5IABI1oS9N0q9ZETVVaMQ9cndEcwqgj4DPO3BetQ7QFz-_M4Tq9mnBhUWVOXnH0bnpG6-TUTl-hp891X6tA8UcS4GZ-IJN367seyr8fw_NdlASDZxk4udZ9s74lMPIBpknpXXAYyb3zPuW4NEkaihiavxPIVct8_4-UqgPhdcOC5MIQcb1SbYCVuSY9UEjf4f0MSsIdyWkkseoyWQ0IxxDD9WwxBU9lfidHUIa2XiNBoC0RvaUHD0qMYXCO21SGLbgpDzUuvOw9vU1Uv3Xx9_YXkw3k8PO0tSs0gn2ssoA1p8qaZBQ7i1q8LbWfnHKtupjf6X3svacq9ZNuviqmpCtTBEN_IHbwMg79hSMQ6ua7Fmnbfjx6x-6PRCuqO-Babp_cGKsEEx04D87xj5gg3xMxUIWEBV8uBxxfyUfVjQ5wIYaCYxfGVQlQbYAQfnUzVy36KPCearWOgLUFSnbufcFBylbwTo98PIx4I9yjc-MH3Hr_ZnhNWBx3SRudQ1R6L_HX9VdjUhuNyZUHFEbxWztQ45waQDkqR-6dv2ZX4Dvks_vy93WvqeFJSH4u8zB5CesLjNv8fe5n3tlNywKXwk2mEttMAmTENeYqiZIorcHQngPwOBTkRElJYpK9xZkll1QAIffgVdQF7-pV83PNgyLJU2aOzFS30iUsfKGv_A4YHsX5q1xjAmF20-r7oGMRnDHTyVQc1ucMMyudDbtJMrn6jAAp-eVZrZY2kJsfGI4XlMYLzDtAKz1zwkaPVkjDzcElBG9yUKHcnYgEEs5PSVUpqGz-tdzv4K_qtfhTG58E3_hRTco3IlGizrOn6W_HL8OKgsn-QmwQnetHaraeKM8vBUYjxpwEL9o3E6zG0wCsldhCferQ1UnCDrjtP8xi3X7Qq2JWgoZ5fA0BG0TQLaDOQF0dm-JPxN0SD1PC5f3I3UbVd7cdSfSx-8tipbq81xRDuoDikQv2oBhfxFZUkKtffvz8F45NJSrnK3m5pLosYavq8sLLFCkSs1u5k8KcHsvllV0L0cVA4EGxcZ2u2WcvFUhxM7wYwk3d6C6UmlOP1GB0aUZmUgPt4R9o8wLoS9_srWWWpIQ04WQn9p-qroX59bBnUConqlXJR3edcN9U2Np3P_b7xvDNwjHV3FLe7kq0bE31iZDPMJCiDcy8axHs4-OcDapHsPCn5wzLvOjjAssM9HCE_NDA_uOuazBGYDkZyLqxqRze5QBlqiO8_skgjBUsAkCKrhCXEaVrAVGoIxRi0uj-d9XnuBaay5fRiy69n2bySeR9uNqYXlPb-ZvOAJSRgwlf5KEIywq_-c_BMlMngj7hzx_TmXTdTxd5CnICuFYX6zbVFsOHwF5s7hSM1HFaKf10Kkm0HNrrl_einA8i-xpq5djHV0bhBmqVEPVdgUwvSXHoASRjkcAbj72PPE464NLieXJrMRCsQ5d9VTyOOPIjgscY6xwNfOtUrMmBHIeR54DqWn3Vumf9hJs8u_htWxUWvJnUWDLo8kxEiKfnB_I5Mjw5xwYlWzQ26iBWUisBBLSrH5m7xHjwfuc0-pNs4A0oOE8Ud2S7XTFEIUOX92VAjFwDga3sUiCgVWvGed1FwIdOTZvuI_Tu6wHfkuBrKHKacX7G4WCGX9qlGVG3mtf5iP06cGK-mfdyfK6xhICY4WDefitSsPJss0NpI5vqT0N_gLBEZU5kl_7EFp1TIr593MYp9cb0C9UmLZ3ReaLZXbPwFyXOCT6ipgn2Homo="),
                 },
             },
         ),
@@ -23,10 +23,10 @@ expression: v
                 timestamp: 2020-01-01 0:00:00.0 +00,
                 kind: ToolCallRequest(
                     ToolCallRequest {
-                        id: "call_i95it8x7WlrY7fZeliTs6shY",
+                        id: "call_1W5hSpB0eF8Xllvo5dyLR65p",
                         name: "run_me",
                         arguments: {
-                            "foo": Null,
+                            "foo": String("example input"),
                             "bar": String("foo"),
                         },
                     },
@@ -44,11 +44,11 @@ expression: v
                 timestamp: 2020-01-01 0:00:00.0 +00,
                 kind: ChatResponse(
                     Message {
-                        message: "Done — the tool returned: \"working!\"",
+                        message: "Tool run completed. Output: \"working!\"",
                     },
                 ),
                 metadata: {
-                    "openai_item_id": String("msg_02702adc8fbb7a3a016a886db2cc3487d293743440c7837e04"),
+                    "openai_item_id": String("msg_025af4c5cac58077016aa3da8db40887d2ae1be5affa1d6db4"),
                 },
             },
         ),
diff --git a/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning.yml b/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning.yml
index 2f3c4829e..d91730fcb 100644
--- a/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning.yml
+++ b/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning.yml
@@ -87,337 +87,58 @@ then:
       value: text/event-stream; charset=utf-8
   body: |+
     event: response.created
-    data: {"type":"response.created","response":{"id":"resp_02702adc8fbb7a3a016a886dad9d9487d2a68983a3b99abd6f","object":"response","created_at":1787325869,"status":"in_progress","background":false,"completed_at":null,"error":null,"frequency_penalty":0.0,"incomplete_details":null,"instructions":null,"max_output_tokens":null,"max_tool_calls":null,"model":"gpt-5-mini-2025-08-07","moderation":null,"output":[],"parallel_tool_calls":true,"presence_penalty":0.0,"previous_response_id":null,"prompt_cache_key":"jp:conversation:1577836800000000","prompt_cache_retention":"in_memory","reasoning":{"context":"current_turn","effort":"low","mode":"standard","summary":"detailed"},"safety_identifier":null,"service_tier":"auto","store":false,"temperature":1.0,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"required","tool_usage":{"image_gen":{"input_tokens":0,"input_tokens_details":{"image_tokens":0,"text_tokens":0},"output_tokens":0,"output_tokens_details":{"image_tokens":0,"text_tokens":0},"total_tokens":0},"web_search":{"num_requests":0}},"tools":[{"type":"function","description":null,"name":"run_me","output_schema":null,"parameters":{"type":"object","properties":{"foo":{"type":["string","null"],"default":"foo"},"bar":{"type":["string","array"],"enum":["foo"],"items":{"type":"string","enum":["foo","bar"]}}},"required":["foo","bar"],"additionalProperties":false},"strict":true}],"top_logprobs":0,"top_p":1.0,"truncation":"auto","usage":null,"user":null,"metadata":{}},"sequence_number":0}
+    data: {"type":"response.created","response":{"id":"resp_025af4c5cac58077016aa3da88e8bc87d2b70d6deed2655855","object":"response","created_at":1789123208,"status":"in_progress","background":false,"completed_at":null,"error":null,"frequency_penalty":0.0,"incomplete_details":null,"instructions":null,"max_output_tokens":null,"max_tool_calls":null,"model":"gpt-5-mini-2025-08-07","moderation":null,"output":[],"parallel_tool_calls":true,"presence_penalty":0.0,"previous_response_id":null,"prompt_cache_key":"jp:conversation:1577836800000000","prompt_cache_retention":"in_memory","reasoning":{"context":"current_turn","effort":"low","mode":"standard","summary":"detailed"},"safety_identifier":null,"service_tier":"auto","store":false,"temperature":1.0,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"required","tool_usage":{"image_gen":{"input_tokens":0,"input_tokens_details":{"image_tokens":0,"text_tokens":0},"output_tokens":0,"output_tokens_details":{"image_tokens":0,"text_tokens":0},"total_tokens":0},"web_search":{"num_requests":0}},"tools":[{"type":"function","description":null,"name":"run_me","output_schema":null,"parameters":{"type":"object","properties":{"foo":{"type":["string","null"],"default":"foo"},"bar":{"type":["string","array"],"enum":["foo"],"items":{"type":"string","enum":["foo","bar"]}}},"required":["foo","bar"],"additionalProperties":false},"strict":true}],"top_logprobs":0,"top_p":1.0,"truncation":"auto","usage":null,"user":null,"metadata":{}},"sequence_number":0}
     
     event: response.in_progress
-    data: {"type":"response.in_progress","response":{"id":"resp_02702adc8fbb7a3a016a886dad9d9487d2a68983a3b99abd6f","object":"response","created_at":1787325869,"status":"in_progress","background":false,"completed_at":null,"error":null,"frequency_penalty":0.0,"incomplete_details":null,"instructions":null,"max_output_tokens":null,"max_tool_calls":null,"model":"gpt-5-mini-2025-08-07","moderation":null,"output":[],"parallel_tool_calls":true,"presence_penalty":0.0,"previous_response_id":null,"prompt_cache_key":"jp:conversation:1577836800000000","prompt_cache_retention":"in_memory","reasoning":{"context":"current_turn","effort":"low","mode":"standard","summary":"detailed"},"safety_identifier":null,"service_tier":"auto","store":false,"temperature":1.0,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"required","tool_usage":{"image_gen":{"input_tokens":0,"input_tokens_details":{"image_tokens":0,"text_tokens":0},"output_tokens":0,"output_tokens_details":{"image_tokens":0,"text_tokens":0},"total_tokens":0},"web_search":{"num_requests":0}},"tools":[{"type":"function","description":null,"name":"run_me","output_schema":null,"parameters":{"type":"object","properties":{"foo":{"type":["string","null"],"default":"foo"},"bar":{"type":["string","array"],"enum":["foo"],"items":{"type":"string","enum":["foo","bar"]}}},"required":["foo","bar"],"additionalProperties":false},"strict":true}],"top_logprobs":0,"top_p":1.0,"truncation":"auto","usage":null,"user":null,"metadata":{}},"sequence_number":1}
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-    data: {"type":"response.reasoning_summary_text.delta","delta":" for","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"PPNSSL4B8sGN","output_index":0,"sequence_number":57,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" functions","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"PW7kb8","output_index":0,"sequence_number":58,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" tools","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"tAziKcRjFF","output_index":0,"sequence_number":59,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":".","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"lsg2YZkLNihX6yA","output_index":0,"sequence_number":60,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" Since","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"nUZTlGn2ZH","output_index":0,"sequence_number":61,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" it","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"J6fD3BAQcKlUM","output_index":0,"sequence_number":62,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" seems","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"2BRG7IAw5D","output_index":0,"sequence_number":63,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" simpler","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"4aoMN848","output_index":0,"sequence_number":64,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":",","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"1IUIQREwo5QW3eB","output_index":0,"sequence_number":65,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" I'll","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"LbCVHvap0tq","output_index":0,"sequence_number":66,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" just","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"hfWhV6or5x2","output_index":0,"sequence_number":67,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" call","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"Q0xQFML0Tkz","output_index":0,"sequence_number":68,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" functions","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"uzua3V","output_index":0,"sequence_number":69,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":".run","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"7HPVv1nSDdfW","output_index":0,"sequence_number":70,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":"_me","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"kLx91mkM55TG4","output_index":0,"sequence_number":71,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" directly","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"YckT0y9","output_index":0,"sequence_number":72,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" and","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"xnQdixkUrJL6","output_index":0,"sequence_number":73,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" use","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"T9Mt9xJkDo2t","output_index":0,"sequence_number":74,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" the","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"LzRmF5WQwKmI","output_index":0,"sequence_number":75,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" commentary","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"PNGVt","output_index":0,"sequence_number":76,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" channel","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"8OKgjDb0","output_index":0,"sequence_number":77,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" for","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"yESMfKbpMwCv","output_index":0,"sequence_number":78,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" this","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"7uqouZInbYN","output_index":0,"sequence_number":79,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":".","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"Pt0muXBwLvfnRMi","output_index":0,"sequence_number":80,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" My","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"30xTSCKqmf9Gm","output_index":0,"sequence_number":81,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" plan","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"FohTioCeAOd","output_index":0,"sequence_number":82,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" is","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"DR3BOWmf9cqD5","output_index":0,"sequence_number":83,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" to","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"vSJBnU1VmV1xg","output_index":0,"sequence_number":84,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" call","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"CmklfxpOB3k","output_index":0,"sequence_number":85,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" it","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"ut2xzi73QeShh","output_index":0,"sequence_number":86,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" with","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"HRU6JvMjq2v","output_index":0,"sequence_number":87,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" \"","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"MipEZrpPet9Asy","output_index":0,"sequence_number":88,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":"foo","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"XotOK8OKXW8yn","output_index":0,"sequence_number":89,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":"\"","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"aQx6gLgfYLm4ToE","output_index":0,"sequence_number":90,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" set","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"TqjNQ2Cbd8E7","output_index":0,"sequence_number":91,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" to","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"jXMNVtdgIiPVx","output_index":0,"sequence_number":92,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":" null","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"sEgj2yw54eJ","output_index":0,"sequence_number":93,"summary_index":0}
-    
-    event: response.reasoning_summary_text.delta
-    data: {"type":"response.reasoning_summary_text.delta","delta":".","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","obfuscation":"cqeef9JLXcI2vmD","output_index":0,"sequence_number":94,"summary_index":0}
-    
-    event: response.reasoning_summary_text.done
-    data: {"type":"response.reasoning_summary_text.done","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","output_index":0,"sequence_number":95,"summary_index":0,"text":"**Analyzing tool call options**\n\nI need to call a tool, specifically functions.run_me, which requires setting the \"bar\" parameter as \"foo,\" but \"foo\" can be null or a string. I’m considering whether to use multi_tool_use.parallel for multiple calls, but it only works for functions tools. Since it seems simpler, I'll just call functions.run_me directly and use the commentary channel for this. My plan is to call it with \"foo\" set to null."}
-    
-    event: response.reasoning_summary_part.done
-    data: {"type":"response.reasoning_summary_part.done","item_id":"rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27","output_index":0,"part":{"type":"summary_text","text":"**Analyzing tool call options**\n\nI need to call a tool, specifically functions.run_me, which requires setting the \"bar\" parameter as \"foo,\" but \"foo\" can be null or a string. I’m considering whether to use multi_tool_use.parallel for multiple calls, but it only works for functions tools. Since it seems simpler, I'll just call functions.run_me directly and use the commentary channel for this. My plan is to call it with \"foo\" set to null."},"sequence_number":96,"summary_index":0}
+    data: {"type":"response.output_item.added","item":{"id":"rs_025af4c5cac58077016aa3da898c1c87d2884e863491b22f1e","type":"reasoning","content":[],"encrypted_content":"gAAAAABqo9qJRdRVoq_OGt87RVPtHK-dxdJZxNn_8-ZS1UJ3Ue3BUV4jNtAQ-c0flecOsi8NdlwqvNioDlhTz6JLwL74e_4rEuRJFRFiswXKfbeYKZn7gLlNVy-1qYTMM4pLlhI9pK-51w3fp3bm3D8wAWNdbC4gAIjKHz17Bo-kdmlSLpZlx2qTugcEUBVpSA5BsKVzi-JhyQERUWtj64-ufXPHd-IEDduazgQAo6WMLd88Abr0p91qEBAb1G8401_4v7JkjPefvSUeX2gxpp4LegnhA_YUEwHA-ueLE16XYvT-vw2nT15Annu5bwKopFaYpEIr4m3mGCISjMQeK1a1XjP01zsI1qdqpuz8O846eMO1rGtoZY8DUchgZ1MBxGh0qTH_MmmQZSRe2f3qxEkVU1ZUWrSlqhxP19ds5u_ARBBwat1BXb1Y4ojB6X7W-u5e-SXfPVbs_Uc8r5Y2wUehgX5C0veL_MeqsOgxfgJLwHV3YLoOqL1rD91QcD-4RAtRWcDze6eTdyy4aZGs_xosLnlZ-fU0-hpyT_D_239rUWSIV5-6Q7W11O_x4uCnlnNvKmn_iKUrSz7OnCcWPYBvGY3UfMNBpaFID5xButk8s4OrcOuGJLIW6I3UQPI03vEuhhlf8nKsgmmDf8gvmoNUPc6qnhBXnPTm77ZU-vqv-HvAtNwdT-8Kkl47SGMHlZpWgSOtwRTAmW-cVJBjhh32faYwwDQz_OQfN-eSXPJ6q8g7_Hz0PwJ9KnYUS8nnj60rZFwDzn9HuwAhZhswWeHC8iUxQkxBJlWwWngY_FK1K9GKeNcVoMFkHsXOfDLsLVsarBRkNlHfrWE6vHKTbWRTevQmTgUMlUI9s5vf90yt3PJ4g4z14Pg9l13kjVo4YO0SMlOUOcYcv2fCW4GeHZonLLlucOakcthBS11rYPIeeKod_IQkyJEMfNwcF9O1F5CRDclAUxL_jQPne5opPSNUbSzXK9I17-B3eCDda7ivY7GL-_9cI8QFGwKD2qgqcKOHE_wM3GcM4BiHWy9m312tZQVTyfH3ON19p0w6NT6tJYjLeGN9cguh_sjW2_7Tka2M3qC-rK3Pty6ngEDUojD3oHRUTmP8-XzHglbJ6oBL1dZpeEV_q9NTs6cHR1jey3s5-zwdfC71ikQBFcIuJxEHXHWQm2TCI0ZNn_gUi7kCQ-HCE8uskxE=","summary":[]},"output_index":0,"sequence_number":2}
     
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+    data: {"type":"response.completed","response":{"id":"resp_025af4c5cac58077016aa3da88e8bc87d2b70d6deed2655855","object":"response","created_at":1789123208,"status":"completed","background":false,"completed_at":1789123213,"error":null,"frequency_penalty":0.0,"incomplete_details":null,"instructions":null,"max_output_tokens":null,"max_tool_calls":null,"model":"gpt-5-mini-2025-08-07","moderation":null,"output":[{"id":"rs_025af4c5cac58077016aa3da898c1c87d2884e863491b22f1e","type":"reasoning","content":[],"encrypted_content":"gAAAAABqo9qNuIceghHYzLw-iQJRP7akss1EQg8s0qTC4AppNaB8XQv-lNNdwQK0HgfgC9Yle1m7Gv9ezU16WwZiB1pRUoc4MUIm7P9YI1OfP7QxfenwlpSxqGpMIv3in81TLvhZKyoFV5j9iDKVSyBuB8jD1YAQ683_eaocnJbQ8uQUtucqUcsqbH04xwbCLNaDLH2nFQeB7G9ExcRQTQkyumDlpdAJ04md4hz1CmXKiM0Lbah4gn4oZ40CSMRPPXd32zIfKiPUeqMFiikYPcJlmCfEVPbPM7-ke8PqZi0snHi7Zmr9Lod06OyRvwa7jCavwnfTxqnG5zi-MmITOh7veuZ49jrTJ9Z7GoyeZ1Jwz55RfN3Q99qcWejfRFHU51Nap-BmV4eeBMFvUzaj_2AZUJrUWgRLwNejijV4DhDO98aaO6xKcJp86HYh1EkTrzPRXu8XYjwyXyG6B6ng2kdXcIKJgOgqY5HouTgoHKBYqpqqT8OP1_8X1bRyUVRRQW_kBxDrabTDOfoVTPKAgiosWPpfn_zmObfnhA_O2xcX5w2QXBjzWvG-coNrlAPBpKYfGJAuOG6D1vgQrIm5xUDr6jRii_Yiy3eA60vYSiEClkavxqfc2nZ7RB4HZpGLjkpBC96NYgN-o8gQlu9RQZBRCN4eP9tCm8443liobPH9bsVsGfRE2fEMRdX-sLB5HxHqNgGX6_0UnNJTc58y2XaY4u-XICdFyYvyGck3MZqsrlyIlo9ls5wBuO3ACuwnPC7tdRbSLz_7NMCoWJX2KMReB2lRQFi0-X11ynU1uFaEEYSC2ngcONbDq0DJBHmF0nfX-J9-WhPUU_JzlaRNnpDvhF0iRCmQlBMkpHXVHKstCw3hiPmn3CRhezXQ3tfd98do4w--idm6yyPf_WB9A-7rvdEWkwUHGJfEDWV1LiGazon2zvLc4zsJi42_c7GD8MCs0W4v5g5HWPjOOFs0LzYdi7mV2-aDQoyfrNVpFOLzxoLtSWWBgsqOYakyhzp6Pzzft3yKyDftVZ3GPw57OPGGee8lHsI0lHlAHtUfdYjta8mKySHLSlTq5hXmS7uVbSC5--VWonXgEnjjKMGU_LAb5H_BHAHK1hQCUhWG3Xw4zSgNfzeTRyJNJ8fIw8-qd5t_Vcymm93d-KZRkewcKFhX3_mHAB8m-cjH9a2oyqFsv_vxhq7wRJ1x52bo3C1JWNdog87GpDyj__LNaQUuxT2cf4NBhFwSdmbUkFVWLid65pE8azKJPJad550o4RbSOc-j2iyCm2ulNjZzWVgRxVBNHQ6owr_dWoeloY4qSXk_Fulo4g-PxRCBGwgC-4yc7-rlMCErUZBYLL0UyXA8oTnVK5mvZd6riGoMY6383IjqY7C7Y98wZGraCgvk8w-w13tNR1bD9hqnU3EfHJZtnrWgR6_hZu1apLv2J6UIOyAsuRpkbYO_ePEfC1mwRYxNqkkj_yJokjYYkDcadJakImb7ZVUgV4BFpzRPbV-cNyCorb0uBk-Zw9DJOo73ZoM_23eD5rv5y6XxlaBckv1a5HUBqFnFdlY6t86TPzgGZY6CSLny0hgNaY5Sr39u2xopbuuTmcF2wa_BU2TkHioxZbd36Qcqb_0BbGKwXhAv--cnd_KXkaFiw4eYxV2jQXOPom8PIG8xtYo0EjwpB_5DWfoHs8Xt4waAa9OBETd25DspG2nJHCm76BPY6U77JdmUZQcEGNVHLDFxNod_5zJbZckKD8UfO7AJDCwPJ5fevq7CN1zYgJjMqVg=","summary":[]},{"id":"fc_025af4c5cac58077016aa3da8d050487d28e4bc03df2ce0cce","type":"function_call","status":"completed","arguments":"{\"foo\":\"example input\",\"bar\":\"foo\"}","call_id":"call_1W5hSpB0eF8Xllvo5dyLR65p","name":"run_me"}],"parallel_tool_calls":true,"presence_penalty":0.0,"previous_response_id":null,"prompt_cache_key":"jp:conversation:1577836800000000","prompt_cache_retention":"in_memory","reasoning":{"context":"current_turn","effort":"low","mode":"standard","summary":"detailed"},"safety_identifier":null,"service_tier":"default","store":false,"temperature":1.0,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"required","tool_usage":{"image_gen":{"input_tokens":0,"input_tokens_details":{"image_tokens":0,"text_tokens":0},"output_tokens":0,"output_tokens_details":{"image_tokens":0,"text_tokens":0},"total_tokens":0},"web_search":{"num_requests":0}},"tools":[{"type":"function","description":null,"name":"run_me","output_schema":null,"parameters":{"type":"object","properties":{"foo":{"type":["string","null"],"default":"foo"},"bar":{"type":["string","array"],"enum":["foo"],"items":{"type":"string","enum":["foo","bar"]}}},"required":["foo","bar"],"additionalProperties":false},"strict":true}],"top_logprobs":0,"top_p":1.0,"truncation":"auto","usage":{"input_tokens":60,"input_tokens_details":{"cache_write_tokens":0,"cached_tokens":0},"output_tokens":119,"output_tokens_details":{"reasoning_tokens":64},"total_tokens":179},"user":null,"metadata":{}},"sequence_number":17}
     
 ---
 when:
@@ -439,19 +160,19 @@ when:
         },
         {
           "type": "reasoning",
-          "id": "rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27",
+          "id": "rs_025af4c5cac58077016aa3da898c1c87d2884e863491b22f1e",
           "summary": [
             {
               "type": "summary_text",
-              "text": "**Analyzing tool call options**\n\nI need to call a tool, specifically functions.run_me, which requires setting the \"bar\" parameter as \"foo,\" but \"foo\" can be null or a string. I’m considering whether to use multi_tool_use.parallel for multiple calls, but it only works for functions tools. Since it seems simpler, I'll just call functions.run_me directly and use the commentary channel for this. My plan is to call it with \"foo\" set to null."
+              "text": ""
             }
           ],
-          "encrypted_content": "gAAAAABqiG2xnaWTAwVx7x04cr5y6QDQVOvd0elZQTGi27BcEUr3BIG0OaUr9VTFqfuknzmuUOavCeWmcVTREMX-RQg5Y8TrIutPPGnT7yBlav4wNbnt0YEw_xf-TD5pHla9ZMNaMkxEDkfqfBVpc_y22tSXK4bku-LzAqdkjwX6dVehYXW0RYScYXn0iyPNoObad6kD74ijzhATuTjGtzH-l4aXN2L-7cVy5HmNo15lm_XSwyyya1NN7_Ao-i9yl8C7rKi9GvZwSsuT34h8RL5jRxiBx6-pTir687fabzxY4yh4XwnmUFFn_VWahwklsH_w7K5as_fT4LkDffQsY8xl9tM_yALD3iRcobeE_EXGZvbBmyC7X2s19Q5LCSYKMsWS15c6sYQNUSMQE5fCyOIxruJbDzTBwRdFKM9ZAM5UaY8QZYFXKpQpKQ-KnzSCyj7JFiohHNVnrGnQ0kRmtO759gRah49w1sait_tY2UKhS6DP18XDOw1PlznJTNto_uDNLSxNZg6z87wbu1jbuT2EBeiPXQ_hXrRk0HbFo6cx3W8YdAoIBJaFZS-3o6NhtHmLdsv2x2pH54AZ9VIz2lLS2J5E5O3bwKSRPAFu8PPAyKNZrs3oZe6LxXburqbNDtn_-9P2SEPLy_LJLDTBtoumsI3OWhxI-2-z8YIzdXjM1hqY_klki_nQDxRZTeRA2PHT7i_0mGEB2m16fId4AuNrRRetO_GBW55Tq1pNddZTNrPVEX9iT2CM5OB5fI6mV9kxAnxIszBMC8ffsho3FUgTpdyBjDn0Rw6PpDCBg543CV2QR_1rGujxMUqgLdydxT5VM0QlnoiWS9KcMZssvCCwkGvjXJjllynbNWuuK62K9IWXV3skFXXD5wuc2LbzbcwUczDzkeO0Bbu6et-P4fRDd5ZxMFz_uzE1ZK1MHIpQ0kX_DDsFi1frDziQ9yi4pXg7j4S1IoyCSXwqEQDf7KTnVW1KU70J1SLND_5dxNk_UZDRVvHItBHwykE1udDh-4xB_YUX9ifWM0NI6QkCoG1HgwdTQY_l3rxLDG4ISE5arr_Tw5CjfhpX19wBwPhqtB3ESeQH6utkPkKg1Z2A7ouf2VbXkV6prHR9sNmOrAe2RvZzqRor4cft3TfHVp-euRKDL3iPVjrwLC-OVsHPGniIiS6U3wsdi67JDEQrLoparVTSIMi3A8NMed371UrjLWlGGfICGJPy6TV9YJzQx4zhFhTNvueKBZrMlts8DF9GVKqv8UDsfxEW_xxIGkSwSl2UjmRzkFEWLGov-q5D_g7_0cEFCN2bo3ui5AZI5lv12EoM7P9pbORxh71hT0cn7GTm7Avl1_lJdlBhlSu1-pT_jWgpJAtem_6T0sUrB9kcgu3jFJbWhuD6KM1ZG_0xB35F-u7UzKO1H4yVlWQDMTje3OXZwpFE7fhVwTWHfa80EriyB9ZHKMdAkNI0baeB59lZrx1FPu9YLxvtp0793KLM4J7_qIKJhp0ZVR4Dxy9UE1lInJUXeqTN0mm5t3fBN6HayQjxZ-P5P-gbXm8xUxgrP69PvdBb32Hggs4hzw0KwGRsRED-nR_PVY5MTGILs7mV_Me9EPLrisJdAqE0d3Km7zrc643HY9_rpuLiAzqxr35ZbP8pzkCQlXoxPB-Zam_pxq8EJ1RoX3BGukvoo1D83VulqsCFS_yQpUat-mq40nNfeSquHs0="
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         },
         {
           "type": "function_call",
-          "arguments": "{\"foo\":null,\"bar\":\"foo\"}",
-          "call_id": "call_i95it8x7WlrY7fZeliTs6shY",
+          "arguments": "{\"foo\":\"example input\",\"bar\":\"foo\"}",
+          "call_id": "call_1W5hSpB0eF8Xllvo5dyLR65p",
           "id": null,
           "name": "run_me",
           "status": null
@@ -460,7 +181,7 @@ when:
           "type": "function_call_output",
           "id": null,
           "status": null,
-          "call_id": "call_i95it8x7WlrY7fZeliTs6shY",
+          "call_id": "call_1W5hSpB0eF8Xllvo5dyLR65p",
           "output": "working!"
         }
       ],
@@ -493,53 +214,53 @@ then:
       value: text/event-stream; charset=utf-8
   body: |+
     event: response.created
-    data: {"type":"response.created","response":{"id":"resp_02702adc8fbb7a3a016a886db26d2087d2a102898b55fe47fd","object":"response","created_at":1787325874,"status":"in_progress","background":false,"completed_at":null,"error":null,"frequency_penalty":0.0,"incomplete_details":null,"instructions":null,"max_output_tokens":null,"max_tool_calls":null,"model":"gpt-5-mini-2025-08-07","moderation":null,"output":[],"parallel_tool_calls":true,"presence_penalty":0.0,"previous_response_id":null,"prompt_cache_key":"jp:conversation:1577836800000000","prompt_cache_retention":"in_memory","reasoning":{"context":"current_turn","effort":"minimal","mode":"standard","summary":"detailed"},"safety_identifier":null,"service_tier":"auto","store":false,"temperature":1.0,"text":{"format":{"type":"text"},"verbosity":"medium"},"tool_choice":"auto","tool_usage":{"image_gen":{"input_tokens":0,"input_tokens_details":{"image_tokens":0,"text_tokens":0},"output_tokens":0,"output_tokens_details":{"image_tokens":0,"text_tokens":0},"total_tokens":0},"web_search":{"num_requests":0}},"tools":[],"top_logprobs":0,"top_p":1.0,"truncation":"auto","usage":null,"user":null,"metadata":{}},"sequence_number":0}
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     event: response.in_progress
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     event: response.completed
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diff --git a/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning__conversation_stream.snap b/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning__conversation_stream.snap
index e57be6444..81f030721 100644
--- a/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning__conversation_stream.snap
+++ b/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning__conversation_stream.snap
@@ -243,19 +243,19 @@ expression: v
     {
       "timestamp": "2020-01-01 00:00:00.0",
       "type": "chat_response",
-      "reasoning": "**Analyzing tool call options**\n\nI need to call a tool, specifically functions.run_me, which requires setting the \"bar\" parameter as \"foo,\" but \"foo\" can be null or a string. I’m considering whether to use multi_tool_use.parallel for multiple calls, but it only works for functions tools. Since it seems simpler, I'll just call functions.run_me directly and use the commentary channel for this. My plan is to call it with \"foo\" set to null.",
+      "reasoning": "",
       "metadata": {
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     },
     {
       "timestamp": "2020-01-01 00:00:00.0",
       "type": "tool_call_request",
-      "id": "call_i95it8x7WlrY7fZeliTs6shY",
+      "id": "call_1W5hSpB0eF8Xllvo5dyLR65p",
       "name": "run_me",
       "arguments": {
-        "foo": null,
+        "foo": "ZXhhbXBsZSBpbnB1dA==",
         "bar": "Zm9v"
       }
     },
@@ -275,16 +275,16 @@ expression: v
     {
       "timestamp": "2020-01-01 00:00:00.0",
       "type": "tool_call_response",
-      "id": "call_i95it8x7WlrY7fZeliTs6shY",
+      "id": "call_1W5hSpB0eF8Xllvo5dyLR65p",
       "content": "d29ya2luZyE=",
       "is_error": false
     },
     {
       "timestamp": "2020-01-01 00:00:00.0",
       "type": "chat_response",
-      "message": "Done — the tool returned: \"working!\"",
+      "message": "Tool run completed. Output: \"working!\"",
       "metadata": {
-        "openai_item_id": "bXNnXzAyNzAyYWRjOGZiYjdhM2EwMTZhODg2ZGIyY2MzNDg3ZDI5Mzc0MzQ0MGM3ODM3ZTA0"
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       }
     }
   ]
diff --git a/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning__raw_events.snap
index 54f9ed790..a6faf7a72 100644
--- a/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openai/test_tool_call_required_reasoning__raw_events.snap
@@ -11,656 +11,28 @@ expression: v
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-            ),
-            metadata: {},
-        },
-        Part {
-            index: 0,
-            part: Reasoning(
-                " with",
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 0,
-            part: Reasoning(
-                " \"",
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 0,
-            part: Reasoning(
-                "foo",
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 0,
-            part: Reasoning(
-                "\"",
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 0,
-            part: Reasoning(
-                " set",
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 0,
-            part: Reasoning(
-                " to",
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 0,
-            part: Reasoning(
-                " null",
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 0,
-            part: Reasoning(
-                ".",
-            ),
-            metadata: {},
-        },
         Flush {
             index: 0,
             metadata: {
-                "openai_item_id": String("rs_02702adc8fbb7a3a016a886dadf83087d2b66f19ac742d4f27"),
-                "openai_encrypted_content": String("gAAAAABqiG2xnaWTAwVx7x04cr5y6QDQVOvd0elZQTGi27BcEUr3BIG0OaUr9VTFqfuknzmuUOavCeWmcVTREMX-RQg5Y8TrIutPPGnT7yBlav4wNbnt0YEw_xf-TD5pHla9ZMNaMkxEDkfqfBVpc_y22tSXK4bku-LzAqdkjwX6dVehYXW0RYScYXn0iyPNoObad6kD74ijzhATuTjGtzH-l4aXN2L-7cVy5HmNo15lm_XSwyyya1NN7_Ao-i9yl8C7rKi9GvZwSsuT34h8RL5jRxiBx6-pTir687fabzxY4yh4XwnmUFFn_VWahwklsH_w7K5as_fT4LkDffQsY8xl9tM_yALD3iRcobeE_EXGZvbBmyC7X2s19Q5LCSYKMsWS15c6sYQNUSMQE5fCyOIxruJbDzTBwRdFKM9ZAM5UaY8QZYFXKpQpKQ-KnzSCyj7JFiohHNVnrGnQ0kRmtO759gRah49w1sait_tY2UKhS6DP18XDOw1PlznJTNto_uDNLSxNZg6z87wbu1jbuT2EBeiPXQ_hXrRk0HbFo6cx3W8YdAoIBJaFZS-3o6NhtHmLdsv2x2pH54AZ9VIz2lLS2J5E5O3bwKSRPAFu8PPAyKNZrs3oZe6LxXburqbNDtn_-9P2SEPLy_LJLDTBtoumsI3OWhxI-2-z8YIzdXjM1hqY_klki_nQDxRZTeRA2PHT7i_0mGEB2m16fId4AuNrRRetO_GBW55Tq1pNddZTNrPVEX9iT2CM5OB5fI6mV9kxAnxIszBMC8ffsho3FUgTpdyBjDn0Rw6PpDCBg543CV2QR_1rGujxMUqgLdydxT5VM0QlnoiWS9KcMZssvCCwkGvjXJjllynbNWuuK62K9IWXV3skFXXD5wuc2LbzbcwUczDzkeO0Bbu6et-P4fRDd5ZxMFz_uzE1ZK1MHIpQ0kX_DDsFi1frDziQ9yi4pXg7j4S1IoyCSXwqEQDf7KTnVW1KU70J1SLND_5dxNk_UZDRVvHItBHwykE1udDh-4xB_YUX9ifWM0NI6QkCoG1HgwdTQY_l3rxLDG4ISE5arr_Tw5CjfhpX19wBwPhqtB3ESeQH6utkPkKg1Z2A7ouf2VbXkV6prHR9sNmOrAe2RvZzqRor4cft3TfHVp-euRKDL3iPVjrwLC-OVsHPGniIiS6U3wsdi67JDEQrLoparVTSIMi3A8NMed371UrjLWlGGfICGJPy6TV9YJzQx4zhFhTNvueKBZrMlts8DF9GVKqv8UDsfxEW_xxIGkSwSl2UjmRzkFEWLGov-q5D_g7_0cEFCN2bo3ui5AZI5lv12EoM7P9pbORxh71hT0cn7GTm7Avl1_lJdlBhlSu1-pT_jWgpJAtem_6T0sUrB9kcgu3jFJbWhuD6KM1ZG_0xB35F-u7UzKO1H4yVlWQDMTje3OXZwpFE7fhVwTWHfa80EriyB9ZHKMdAkNI0baeB59lZrx1FPu9YLxvtp0793KLM4J7_qIKJhp0ZVR4Dxy9UE1lInJUXeqTN0mm5t3fBN6HayQjxZ-P5P-gbXm8xUxgrP69PvdBb32Hggs4hzw0KwGRsRED-nR_PVY5MTGILs7mV_Me9EPLrisJdAqE0d3Km7zrc643HY9_rpuLiAzqxr35ZbP8pzkCQlXoxPB-Zam_pxq8EJ1RoX3BGukvoo1D83VulqsCFS_yQpUat-mq40nNfeSquHs0="),
+                "openai_item_id": String("rs_025af4c5cac58077016aa3da898c1c87d2884e863491b22f1e"),
+                "openai_encrypted_content": String("gAAAAABqo9qNBxdNxVsQFw3IkPtx5IABI1oS9N0q9ZETVVaMQ9cndEcwqgj4DPO3BetQ7QFz-_M4Tq9mnBhUWVOXnH0bnpG6-TUTl-hp891X6tA8UcS4GZ-IJN367seyr8fw_NdlASDZxk4udZ9s74lMPIBpknpXXAYyb3zPuW4NEkaihiavxPIVct8_4-UqgPhdcOC5MIQcb1SbYCVuSY9UEjf4f0MSsIdyWkkseoyWQ0IxxDD9WwxBU9lfidHUIa2XiNBoC0RvaUHD0qMYXCO21SGLbgpDzUuvOw9vU1Uv3Xx9_YXkw3k8PO0tSs0gn2ssoA1p8qaZBQ7i1q8LbWfnHKtupjf6X3svacq9ZNuviqmpCtTBEN_IHbwMg79hSMQ6ua7Fmnbfjx6x-6PRCuqO-Babp_cGKsEEx04D87xj5gg3xMxUIWEBV8uBxxfyUfVjQ5wIYaCYxfGVQlQbYAQfnUzVy36KPCearWOgLUFSnbufcFBylbwTo98PIx4I9yjc-MH3Hr_ZnhNWBx3SRudQ1R6L_HX9VdjUhuNyZUHFEbxWztQ45waQDkqR-6dv2ZX4Dvks_vy93WvqeFJSH4u8zB5CesLjNv8fe5n3tlNywKXwk2mEttMAmTENeYqiZIorcHQngPwOBTkRElJYpK9xZkll1QAIffgVdQF7-pV83PNgyLJU2aOzFS30iUsfKGv_A4YHsX5q1xjAmF20-r7oGMRnDHTyVQc1ucMMyudDbtJMrn6jAAp-eVZrZY2kJsfGI4XlMYLzDtAKz1zwkaPVkjDzcElBG9yUKHcnYgEEs5PSVUpqGz-tdzv4K_qtfhTG58E3_hRTco3IlGizrOn6W_HL8OKgsn-QmwQnetHaraeKM8vBUYjxpwEL9o3E6zG0wCsldhCferQ1UnCDrjtP8xi3X7Qq2JWgoZ5fA0BG0TQLaDOQF0dm-JPxN0SD1PC5f3I3UbVd7cdSfSx-8tipbq81xRDuoDikQv2oBhfxFZUkKtffvz8F45NJSrnK3m5pLosYavq8sLLFCkSs1u5k8KcHsvllV0L0cVA4EGxcZ2u2WcvFUhxM7wYwk3d6C6UmlOP1GB0aUZmUgPt4R9o8wLoS9_srWWWpIQ04WQn9p-qroX59bBnUConqlXJR3edcN9U2Np3P_b7xvDNwjHV3FLe7kq0bE31iZDPMJCiDcy8axHs4-OcDapHsPCn5wzLvOjjAssM9HCE_NDA_uOuazBGYDkZyLqxqRze5QBlqiO8_skgjBUsAkCKrhCXEaVrAVGoIxRi0uj-d9XnuBaay5fRiy69n2bySeR9uNqYXlPb-ZvOAJSRgwlf5KEIywq_-c_BMlMngj7hzx_TmXTdTxd5CnICuFYX6zbVFsOHwF5s7hSM1HFaKf10Kkm0HNrrl_einA8i-xpq5djHV0bhBmqVEPVdgUwvSXHoASRjkcAbj72PPE464NLieXJrMRCsQ5d9VTyOOPIjgscY6xwNfOtUrMmBHIeR54DqWn3Vumf9hJs8u_htWxUWvJnUWDLo8kxEiKfnB_I5Mjw5xwYlWzQ26iBWUisBBLSrH5m7xHjwfuc0-pNs4A0oOE8Ud2S7XTFEIUOX92VAjFwDga3sUiCgVWvGed1FwIdOTZvuI_Tu6wHfkuBrKHKacX7G4WCGX9qlGVG3mtf5iP06cGK-mfdyfK6xhICY4WDefitSsPJss0NpI5vqT0N_gLBEZU5kl_7EFp1TIr593MYp9cb0C9UmLZ3ReaLZXbPwFyXOCT6ipgn2Homo="),
             },
         },
         Part {
             index: 1,
             part: ToolCall(
                 Start {
-                    id: "call_i95it8x7WlrY7fZeliTs6shY",
+                    id: "call_1W5hSpB0eF8Xllvo5dyLR65p",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
@@ -687,7 +59,16 @@ expression: v
             index: 1,
             part: ToolCall(
                 ArgumentChunk(
-                    "\":",
+                    "\":\"",
+                ),
+            ),
+            metadata: {},
+        },
+        Part {
+            index: 1,
+            part: ToolCall(
+                ArgumentChunk(
+                    "example",
                 ),
             ),
             metadata: {},
@@ -696,7 +77,7 @@ expression: v
             index: 1,
             part: ToolCall(
                 ArgumentChunk(
-                    "null",
+                    " input",
                 ),
             ),
             metadata: {},
@@ -705,7 +86,7 @@ expression: v
             index: 1,
             part: ToolCall(
                 ArgumentChunk(
-                    ",\"",
+                    "\",\"",
                 ),
             ),
             metadata: {},
@@ -765,35 +146,35 @@ expression: v
         Part {
             index: 0,
             part: Message(
-                "Done",
+                "Tool",
             ),
             metadata: {},
         },
         Part {
             index: 0,
             part: Message(
-                " —",
+                " run",
             ),
             metadata: {},
         },
         Part {
             index: 0,
             part: Message(
-                " the",
+                " completed",
             ),
             metadata: {},
         },
         Part {
             index: 0,
             part: Message(
-                " tool",
+                ".",
             ),
             metadata: {},
         },
         Part {
             index: 0,
             part: Message(
-                " returned",
+                " Output",
             ),
             metadata: {},
         },
@@ -828,7 +209,7 @@ expression: v
         Flush {
             index: 0,
             metadata: {
-                "openai_item_id": String("msg_02702adc8fbb7a3a016a886db2cc3487d293743440c7837e04"),
+                "openai_item_id": String("msg_025af4c5cac58077016aa3da8db40887d2ae1be5affa1d6db4"),
             },
         },
         Finished(
diff --git a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning.snap b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning.snap
index cf77c86ee..6c63cc46d 100644
--- a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning.snap
+++ b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning.snap
@@ -13,10 +13,10 @@ expression: v
                     },
                 ),
                 metadata: {
-                    "openai_encrypted_content": String("gAAAAABqiG25K01qfTbWlALE9KLuZO5uv_69IxBdl9djIR6du60aqGAOQnBooMRFBgKFWHUezx-zJWqPLMu6a6A5IHCesUr3nqSMfrODDbSEaUc4EPYwKkylaQomJiKW8fWXhcHpSNndayz1YabVw3foRQ3WkMCbDJDOqId14O7iNvxtdFi-q0zVWBDPJc3QnlyZkXSUIPvsGs0XN26rEuzrYYE8lCBSClZuk4bxapD5T0c3Ol1a46WMrjE5uqteJ0j4lm3s-eXgkER0TAodzKQrGlN0XEJv7wj-W10vMAdt_rjNgnX4DZNnBXZ3t7QsS2R8g7qHezWdkV2D9hIIaObfxyqbnjPiQ1F-1PThKhUhDkOG9h_cKJ-EBN-QGLk6e2Eg247icjSq1HpsrAU5mPZUPSSeVBKWD_T2y_iZalhgwJxHFNh4D7vaQnN6lfUUmDXOnDki49srtv_9bIj6uGLqZNIZZcxCZJ2gMXMmhrzmqr_ms8L3SuJvxGxUDd8toqDKAGsLhk_3KbDC0BWyr7lvFpn-H2RetMT67wKDmYM42HRxYuiA0h077kuvPFdT3ZECthu0Qap9SXUnbcAE3hXGIHf-239WiAS1J9BkxfaSqb0fToDpH5PHn4ZTLDncNQrG5U6RfMA6L1fkVcvbrmqWVLdIGA4sFEpLG580guBkBvuxj0pUbMhy1mSOIgWikH_FHlhbZCP4tbXnCbbCcSNghe-UlPP-rWoxqdL1I4OOe4zn99jg0cTZhhiRZ-ZfYG-MXywsFSpLt9_seN1RKE9nkm7gByoZ7YiXkqjplLMEhraa-KLNYoUK0-awMQaYctW_PKUm9dSn_TRHFxARdTmsS-vt28juOPoFxHKBL-MHG1PU8obM7E_YRGfJ2vBu44KTxOvciHp86jiRXWuIVJ3bV4mxmjjmHzOscsv-Zxj1QamfrFmVJA0lUCcZBY1AqYEQ0ugPAtlhkZmy3mrFtnjuNaYtL_mJyxt9YchPdifJKPsjZczrE5-nPCnWkcdtKhO72OkOgbva2X6nL-phGvmWursqZC9JG37jcmz1OLQklcLf0tw1acbWnN34nfIWtBmUlOwtLwpEA2TRdqJFG3fvcyxopoN-OF2CUETz2s4Lxqa3rQUrTwCu_KX6Ext38gmMTO5oP5XUBLL6jswj_4ZSwjrivIc41YSp9oahfEPivbGyfEWGySmrtJXgioqGwdLeSC57kz47ClXXEVDl5vtoUnrX5xVkZxdQn3MO2YTRQ30Fp7W7sP3XAxvfQr0nhLB0W2kcB0WUaOcsWyqHzfOd7TEB9_VKjPn_jfqakHFO8EvHxCGkVPNSPMXhMWhL0Z0vbOEgx9XGEHlgfdaUPSPNzoSdsgpRUCp2fQnyu9igUnOLJ76iHdnFJDr5WP6cK3Y0EGZRCrO7Mfhi-rb-M6HilU4rvyNleA-sl47N8Wy9_BRXOIY0b8KAgvP3Tu2Kbd1VLiUcgB4icEOZOOSS7VerFU5Hq5mbaLc5sTUnyAZG2uBISXe7xgk2350WP4JgWSE05GNbpRKFy969fCwY9VfNXT532fG-za76HRW21D8Q_XY-w0_IdpQdZiZDq0WeYQBkyagwZQ2SAl_BeXdvaHhb8aUHa-OY5bnEps5exIjChuiSG6LJQkAcUiYU292BNbJCY5L2IrC_zYgmZDV5bguoKEBTaiU02J5idzXqc3wkFhvrKMZqkRdTgFFhe4ArgiNwDfOAvgRVW4vUdL6cdTx4_6ezirZgAHqmVV9PqYwterkTd-HrioOdqURBMlirBjL2PqQdLl2QGRZM_kL57p0xL1oG4a_RfA==.eyJlbmRwb2ludF9zbHVnIjoib3BlbmFpL2dwdC01LW1pbmktMjAyNS0wOC0wN3xvcGVuYWkifQ"),
+                    "openai_encrypted_content": String("gAAAAABqo9qVWVgVSs70JsmgeHy5uwfc1BUsd5iz5SS_x-dhR9X4-XKYOffk-ctbBFuNRVmQ_G5otogvIsf0A0MUxHKzLF0FDmVB_xgBUZjE8NhTD6dhjYv4S4WqiWAzBkLiCqeaXPx8Tftt5snFJmb7nPXFjaDc7F6G0PZB_3rzE28gJOe-GUBf66rwhuB-tFoDjIERRU7tWgvGRk02I-f5XEGbw8NJdLzwTAOPy3tjZ2bccfP_YD0n91XAcvMSdLLVWp0x8VmYWhV2-4lD_1sKOChkFyUIn_Njvt86WJqegNLA75PvLsy7rqq5Hp61noXD5QtYvczx2gyJ-noNwmQXaBFqqd7m0Ys-1fmp9JE7ky5etZN4J6LOlCkzEaVOECvZ_x6eBegQSr7FlIpVlae0uhQ5aYw73OUiLsoNb1vPuRakjQ4ReZJXNPTYjGDhOPZIIDt4IZaAX10WIJr-FuW8QKxK4wvX4-qojYr65fruC3qPbKdG8zj0CbDMokToDvgC7bUtiZiKIm3sh295WI0pvl9QEzEa3Bq3A4g_nzxU1qfBmBxV1qFDbW1lo27N4n3MQRl71a9nQb9FxJWxEnFEd78KS2gMCURPawIYC3TbgNmm7PR8hJaO6bxjfhyAktBcuRlFBo3mnffEsxuaF_yUNePeoCqBTWgC3SaA6KmDF_JUH961w_0_R-7uoVhaxaYTTwMvu9vJ-xsY-823_LR4GQUTswNLzxTnOptiCRx0VsLluu_1cqjzZzOMnXAWvHNWfQBn26VDDIdtyyjFKlKEfYH6n4_Z6MVGPomBXHD4o0Yz0vd3CQ3rNWAJhcP61sOrIcjLlg3h4vyBXVDveIzFHclyjbDnlPLFDqXuUuXbJ7dGux9a01pYvwMggDAUFhCdr1IsqQdXl70Yd0RRhThERjKSvZf5bvoWMn_xpjBWuZmolt1fiJY_giSvMEsA7KU9sc-i0mOm1sSht7Br5DIEswKOSYkb5POe8hIfgomabfDDdxFnKPbR9mcFSIVVRFc0mLgcyTlUFvaeJL_aauXBdmVrTepw-QIrHxgTg5pPeSSVWG1NhpZg2OnYJOJg7-93fUquRdzXilCKVLGdh-JfZ1-nDXHG9s3-HwLA6AHyLO4NCw8X87mcVS60DgZUC3aO-jMA1WPXRzoR0QCOYvqAD3a4eHNiErIcc29g7vwQL7h856YSFnBSeiPDcI_LY2BWmiDaq_rwC1_jm9vY5Nc6nQEXYTb0T3CSLW9pLrLjCir2pIgigW_zQt7w-K_4n_NNs1Ik4M1LeKyFhNe92y7e7wxxh3uDj9iDfsTqJooO0KSvQ7BnUta1LL8b6Gauxu5Lm7MVczOibnZYGNyV6cgC-3oIxdsoMMDvTobIVltkZNF9ynU1buWmTmiTysu140io8CI8VcLkC3PiwR2OwNaOi956UnROlcunuIkeIXqQmO9PH6jGQ1PbTO-_7vG8Eg2ZVGlDsDG3HYwQMPjINNuim3DA1F_HrZDKFXHRP7-U2Ful8ZTBV3ioUM7mFEi78hZVD_T3hngOpS6yjGFcM-A2MWLjKMlDsF9dCDGSGXYbn3UFxjQeQtAHTSMKQDlgr5KizSMEWWIMZS__lxuErK5Z3BKHo_NANpl0xYce2pfJnU7hiliNrfnQwSaDr7pXZZDcxWvVjKl8JozsXxvzSu-kSab67MajPbpxXzE9992oSXYOSrxR3iazQcoro9-8s2d74fzgpRkrIePZQyAYTPjd9GlR6c1M902pn4mCH6kP4fBwCux4lKm_iBwCgwWU-sqp2Kcu9JKUDMSKQhPSR-3QspuFYJJL_kBmL1Nr8rpL83B01sS9JsAnR4dXE7fe-aQK7a2rXyFG2_dIS3M4JHfXS1GUFlpLuZOveahn2_Ys_ZEOZEp9JFaa6FgG6fwnBX_hqQwVcy7Vpl8aGiDFMa2X6nHHC4XdAaVj2-QbND7Mm6pGHNAvYa9CjnpUrT0m-TwnAT6_8S4dpUoifILkiEiRRI-zSVvdSQ==.eyJlbmRwb2ludF9zbHVnIjoib3BlbmFpL2dwdC01LW1pbmktMjAyNS0wOC0wN3xvcGVuYWkifQ"),
                     "openrouter_metadata": Array [
                         Object {
-                            "id": String("rs_0848749866e247ea016a886db6fff087d1b5b6efd41ccac47f"),
+                            "id": String("rs_0efd722f56d64447016aa3da9389c487d19b3ba847be53365c"),
                             "index": Number(0),
                             "field": String("openai_encrypted_content"),
                         },
@@ -29,10 +29,9 @@ expression: v
                 timestamp: 2020-01-01 0:00:00.0 +00,
                 kind: ToolCallRequest(
                     ToolCallRequest {
-                        id: "call_KnvO99RwD3rjBcOEPnBpNQ7O",
+                        id: "call_NjNRzmeNIFfEhIlY1DJt8Elg",
                         name: "run_me",
                         arguments: {
-                            "foo": Null,
                             "bar": String("foo"),
                         },
                     },
@@ -54,10 +53,10 @@ expression: v
                     },
                 ),
                 metadata: {
-                    "openai_encrypted_content": String("gAAAAABqiG26cwCaeVLhIDmyWh9QS5IOMJDoVAS5Rmk2C5l_uTWY1Bvl8Ezj3LOQuyNE429nXWiWolxw0qV2uWLiFUEUJGfSqPUsCGmD4p7XhcLVub26--oj7KcP9v1k0DbwAFZBpbrGYyGCAWMZCXv_QcG6pYO_SvRk4Q5qxOPs6rMYCfJi4Ts9NW1uRzjaxq3nM6VP8Bh5h1l35sgxzQ0_F9S_0ZsEcgaS8W8PI40RpqLCk92o1eO91H9K8rQitNnuyX6NQyI5g_S3p6TycqBipPygYqcgFfqah4F-p-mpDGR7Kz8XDW5rlu_HvUd_QiUxfI_GFmBj71uToKTVJMxOPZTP54GP8zDvnU9qfKJTZ1Ig_QFH54nYshOoyw4i1TpgwpQ4NY6FXkX2rPZoBuqm_gthOENYyyS6g4IW8b23UI98Uz0d92oeI7e090mg8Y3RNJAkJqnzr68sRVSBJtRABwqnhohskJPVDbMESHhKU-kA0pERO2ROHbgizAgbJ5QKCUBcX8cTPf4bcrIYTp453l5AYoImlr4695fSMiQynt6S-U8AiBKDdExEKmxWrxMewsVLvvZvngb_hje9eAht5jSqd9cHSb0MSLUil5egHwR4f19uvgB61pgJtuOaiU54biFYyxiVZV3FWP54PBOemegTCLVu9NzraIZlYacLPJuvFWFWvmHfYkAznogNGtgN6Pbsh3oclbdNc9dz55j40DWOHcLNn7zKf2rq0_UuOSDAjEL_BrFkHIIn-kgRHSpugXWWSu-lMVt1JjqR9ltkES_dmMmoZyJTMnpLNJRreyEqR-GxsA4irGD1Rt5LXKpbkBM7t6DGryAA5uNLDd2m47fjkvY0X9u-p1x4p11ZtOv9IkCJEu8Sgb06SbsH5Q1cN_hx4SXGnhM1EUoDGfeyyAmFxtxQczCeo1-P3hraGJM0TBbWJHIwNQi04OqSKJ7Qp_EUsRZTvi7Wxd4iExRUXADK0JsJw1HiK3LKa-YilPm5mdq6_U9TSRSsX7xwCsZTPCdFvGcpm9Jyf9xKELpHV8Gz5f6nZwHv3cuxrIMEmCU43OX3p-EoLRqjbk3DuSmUkAY07DnwJVdWmncTIaqV3koAbv1GEz0cLu6xnEy7iNiv3UZ6m0jpSi9xJpD2kDUodeGLZywcXxLhEwOqSwbECGr7yXahWJtQb0Y7rTaVVP1_iKVwwqXAcQZhr21JNBoQg-miF7EcrDc9Wa0KR8sGT4_sryiocSGIUuhN9jFbSgcHdOgXPLuwKkyNLvdEoMmkpm8qkmRW3xyo_6qeyDjnl7hoDctpakms3MlXrZ3-QefvOUN2et_Pn3kWNx0I6iqIofy0V9zxjGaGvcTWAVEGHdo0Ncc2PFGgDYpq1JWCn2aka1cKdwvuMZYtdTJKCT0w3L8FTUHW.eyJlbmRwb2ludF9zbHVnIjoib3BlbmFpL2dwdC01LW1pbmktMjAyNS0wOC0wN3xvcGVuYWkifQ"),
+                    "openai_encrypted_content": String("gAAAAABqo9qWuWPlEk077GYV60QwAbJZz80at0wgJ06EL_r10a6s1cL2zr15893j6R_js_nmHN6gxIi3m9JHY0mB6CabO_MSNBH17ucryN8GnlwJSTumks5BsP1P6pirD2T5duzPD59HTlzZT1IZaX6qd1X4W7zeUy7CZoe48vtoBgdlaHgSuGtSFkT_HlmGqo9UciCvFT11HBx5-RMBR17SuUvn-3JqPyI8IolsQV7Di3B-QDFx5RIXFpXD8S8uUPD3Hnz1UKf6Tk4Cfs0OVffyS7Wb38aXKUmSqjKNbcFUlSX8kEpSuvPmgaWkUy4jZX9_oD_lkE3uHQwoTPmAJmpNne9n9pA9LRFGRuuBy0P6CTZjUKwWCOI6mME-Tfl41zaxEvJO2yL2SymSee7Yxyxftw9mPAfqz72JwcncRR1bRvkpcCTSXSJ-6UrT0IJXRYorAhWzcP-f71fiL8pjqIrT1uL7Ry01yHt2cFnQl5K926euu2HjCXjbznUvbEEIeAlc0YTdhQQvS1iHYjBVfX-NuFXjZVqN8oCFCytcJglllY5Qx0-8n9pAjlhw9o_pxzdD3zHU8rtA6adQp9_SR0Db1sk2e4r85dbT9AnnUb5zob9S1TQd2NZRdgZxqBF4idF6zwrlic86sqdLLcW1GH6EoY2jP4w3_1f6EDaGPFwpLvnQtGAWs0Efsl7tml6rzMsKBg5TnFNY8ADwlonk3P7LfsEebrx2gN0mut44h0wlifmzvxS3h4Rj_5NuF63vn5qrTJSFSEzPEFxjsRqaf_H6xq_rP2ttCWrsyXe-J5OXUtwusXATXRmKAm24Ksc-x9bR-C3fycXQAHuxEIc0M3KzgzveP-PcE5u0LSyPCQ3X1QtHkKpPk-qDK0YqHinRt-n6vMkAPiVQr7rElzeifCkib8qivpqBp_6uWoVS3-2h66T91T0hJGqybLoHEQbUoSP8WYX7kGNrE2y_maIgEbTUsC7f2KMmBIYNTO0mXvxFwCficXpa3KNS-_sSYKOGMs-eNi_048WvwQU3cXiqfRIG19AixBC4BzXEADa0VnizkIpBSRLDjoXqlr93-kB-x11nAeyMc2Hcx4vruS295q6mNOWBH5cicNloFcvkQDvYWNXl3g4v7u5y9xcOO9xb7_Q4HU2wjXX-lBP69_EcIjfn85ElHODHPyBnO_dK59KVkIobs0YmeADvpAFb9qAY7_uJh8u9QCgkAZb-LNK9lgcDKAA_dfaHuXhR2ygb6AZ_ogKRONVQWStWqkz2DqPYuXtq-UsDSNXD_IKa6Dixwf4Eh7zQdchmVYyFxPjzfDBz_VvZwEkgsI0T349wrXcLw4c4EYPxrG__5DidbJxV1dc26srw03WG0ytW-Yuo4EtP20mFiMXadrMpsOMyPPa8uKf1vytsjaq9TQ7uY8AMFbMSQz8spuy9VA==.eyJlbmRwb2ludF9zbHVnIjoib3BlbmFpL2dwdC01LW1pbmktMjAyNS0wOC0wN3xvcGVuYWkifQ"),
                     "openrouter_metadata": Array [
                         Object {
-                            "id": String("rs_052d8ffbb7051945016a886dba832487d1ab470a80f3e75c98"),
+                            "id": String("rs_0c90c56a63d867fa016aa3da96bf2887d1b6861c01c7976c84"),
                             "index": Number(0),
                             "field": String("openai_encrypted_content"),
                         },
@@ -70,7 +69,7 @@ expression: v
                 timestamp: 2020-01-01 0:00:00.0 +00,
                 kind: ChatResponse(
                     Message {
-                        message: "I ran the tool for you. Output returned: \"working!\"\n\nArguments used when calling the tool: {\"foo\": null, \"bar\": \"foo\"}\n\nDo you want me to run it again with different arguments or show more details?",
+                        message: "Done — I ran the tool with the argument {\"bar\":\"foo\"} and it returned: \"working!\". Do you want me to run it again with different arguments or perform something else with the result?",
                     },
                 ),
                 metadata: {},
diff --git a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning.yml b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning.yml
index c8ee00fc5..8ded2f92b 100644
--- a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning.yml
+++ b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning.yml
@@ -91,35 +91,17 @@ then:
     
     : OPENROUTER PROCESSING
     
-    : OPENROUTER PROCESSING
-    
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":"","role":"assistant","reasoning":null,"reasoning_details":[{"type":"reasoning.encrypted","data":"gAAAAABqiG25K01qfTbWlALE9KLuZO5uv_69IxBdl9djIR6du60aqGAOQnBooMRFBgKFWHUezx-zJWqPLMu6a6A5IHCesUr3nqSMfrODDbSEaUc4EPYwKkylaQomJiKW8fWXhcHpSNndayz1YabVw3foRQ3WkMCbDJDOqId14O7iNvxtdFi-q0zVWBDPJc3QnlyZkXSUIPvsGs0XN26rEuzrYYE8lCBSClZuk4bxapD5T0c3Ol1a46WMrjE5uqteJ0j4lm3s-eXgkER0TAodzKQrGlN0XEJv7wj-W10vMAdt_rjNgnX4DZNnBXZ3t7QsS2R8g7qHezWdkV2D9hIIaObfxyqbnjPiQ1F-1PThKhUhDkOG9h_cKJ-EBN-QGLk6e2Eg247icjSq1HpsrAU5mPZUPSSeVBKWD_T2y_iZalhgwJxHFNh4D7vaQnN6lfUUmDXOnDki49srtv_9bIj6uGLqZNIZZcxCZJ2gMXMmhrzmqr_ms8L3SuJvxGxUDd8toqDKAGsLhk_3KbDC0BWyr7lvFpn-H2RetMT67wKDmYM42HRxYuiA0h077kuvPFdT3ZECthu0Qap9SXUnbcAE3hXGIHf-239WiAS1J9BkxfaSqb0fToDpH5PHn4ZTLDncNQrG5U6RfMA6L1fkVcvbrmqWVLdIGA4sFEpLG580guBkBvuxj0pUbMhy1mSOIgWikH_FHlhbZCP4tbXnCbbCcSNghe-UlPP-rWoxqdL1I4OOe4zn99jg0cTZhhiRZ-ZfYG-MXywsFSpLt9_seN1RKE9nkm7gByoZ7YiXkqjplLMEhraa-KLNYoUK0-awMQaYctW_PKUm9dSn_TRHFxARdTmsS-vt28juOPoFxHKBL-MHG1PU8obM7E_YRGfJ2vBu44KTxOvciHp86jiRXWuIVJ3bV4mxmjjmHzOscsv-Zxj1QamfrFmVJA0lUCcZBY1AqYEQ0ugPAtlhkZmy3mrFtnjuNaYtL_mJyxt9YchPdifJKPsjZczrE5-nPCnWkcdtKhO72OkOgbva2X6nL-phGvmWursqZC9JG37jcmz1OLQklcLf0tw1acbWnN34nfIWtBmUlOwtLwpEA2TRdqJFG3fvcyxopoN-OF2CUETz2s4Lxqa3rQUrTwCu_KX6Ext38gmMTO5oP5XUBLL6jswj_4ZSwjrivIc41YSp9oahfEPivbGyfEWGySmrtJXgioqGwdLeSC57kz47ClXXEVDl5vtoUnrX5xVkZxdQn3MO2YTRQ30Fp7W7sP3XAxvfQr0nhLB0W2kcB0WUaOcsWyqHzfOd7TEB9_VKjPn_jfqakHFO8EvHxCGkVPNSPMXhMWhL0Z0vbOEgx9XGEHlgfdaUPSPNzoSdsgpRUCp2fQnyu9igUnOLJ76iHdnFJDr5WP6cK3Y0EGZRCrO7Mfhi-rb-M6HilU4rvyNleA-sl47N8Wy9_BRXOIY0b8KAgvP3Tu2Kbd1VLiUcgB4icEOZOOSS7VerFU5Hq5mbaLc5sTUnyAZG2uBISXe7xgk2350WP4JgWSE05GNbpRKFy969fCwY9VfNXT532fG-za76HRW21D8Q_XY-w0_IdpQdZiZDq0WeYQBkyagwZQ2SAl_BeXdvaHhb8aUHa-OY5bnEps5exIjChuiSG6LJQkAcUiYU292BNbJCY5L2IrC_zYgmZDV5bguoKEBTaiU02J5idzXqc3wkFhvrKMZqkRdTgFFhe4ArgiNwDfOAvgRVW4vUdL6cdTx4_6ezirZgAHqmVV9PqYwterkTd-HrioOdqURBMlirBjL2PqQdLl2QGRZM_kL57p0xL1oG4a_RfA==.eyJlbmRwb2ludF9zbHVnIjoib3BlbmFpL2dwdC01LW1pbmktMjAyNS0wOC0wN3xvcGVuYWkifQ","format":"openai-responses-v1","id":"rs_0848749866e247ea016a886db6fff087d1b5b6efd41ccac47f","index":0}]},"finish_reason":null,"native_finish_reason":null}]}
-    
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"id":"call_KnvO99RwD3rjBcOEPnBpNQ7O","type":"function","function":{"name":"run_me","arguments":""}}]},"finish_reason":null,"native_finish_reason":null}]}
-    
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":""}}]},"finish_reason":null,"native_finish_reason":null}]}
-    
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":"{\""}}]},"finish_reason":null,"native_finish_reason":null}]}
-    
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":"foo"}}]},"finish_reason":null,"native_finish_reason":null}]}
-    
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":"\":"}}]},"finish_reason":null,"native_finish_reason":null}]}
-    
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":"null"}}]},"finish_reason":null,"native_finish_reason":null}]}
-    
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":",\""}}]},"finish_reason":null,"native_finish_reason":null}]}
-    
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":"bar"}}]},"finish_reason":null,"native_finish_reason":null}]}
+    data: {"id":"gen-1789123218-lQJQblf9vt2mStfLMxVF","object":"chat.completion.chunk","created":1789123218,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":"","role":"assistant","reasoning":null,"reasoning_details":[{"type":"reasoning.encrypted","data":"gAAAAABqo9qVWVgVSs70JsmgeHy5uwfc1BUsd5iz5SS_x-dhR9X4-XKYOffk-ctbBFuNRVmQ_G5otogvIsf0A0MUxHKzLF0FDmVB_xgBUZjE8NhTD6dhjYv4S4WqiWAzBkLiCqeaXPx8Tftt5snFJmb7nPXFjaDc7F6G0PZB_3rzE28gJOe-GUBf66rwhuB-tFoDjIERRU7tWgvGRk02I-f5XEGbw8NJdLzwTAOPy3tjZ2bccfP_YD0n91XAcvMSdLLVWp0x8VmYWhV2-4lD_1sKOChkFyUIn_Njvt86WJqegNLA75PvLsy7rqq5Hp61noXD5QtYvczx2gyJ-noNwmQXaBFqqd7m0Ys-1fmp9JE7ky5etZN4J6LOlCkzEaVOECvZ_x6eBegQSr7FlIpVlae0uhQ5aYw73OUiLsoNb1vPuRakjQ4ReZJXNPTYjGDhOPZIIDt4IZaAX10WIJr-FuW8QKxK4wvX4-qojYr65fruC3qPbKdG8zj0CbDMokToDvgC7bUtiZiKIm3sh295WI0pvl9QEzEa3Bq3A4g_nzxU1qfBmBxV1qFDbW1lo27N4n3MQRl71a9nQb9FxJWxEnFEd78KS2gMCURPawIYC3TbgNmm7PR8hJaO6bxjfhyAktBcuRlFBo3mnffEsxuaF_yUNePeoCqBTWgC3SaA6KmDF_JUH961w_0_R-7uoVhaxaYTTwMvu9vJ-xsY-823_LR4GQUTswNLzxTnOptiCRx0VsLluu_1cqjzZzOMnXAWvHNWfQBn26VDDIdtyyjFKlKEfYH6n4_Z6MVGPomBXHD4o0Yz0vd3CQ3rNWAJhcP61sOrIcjLlg3h4vyBXVDveIzFHclyjbDnlPLFDqXuUuXbJ7dGux9a01pYvwMggDAUFhCdr1IsqQdXl70Yd0RRhThERjKSvZf5bvoWMn_xpjBWuZmolt1fiJY_giSvMEsA7KU9sc-i0mOm1sSht7Br5DIEswKOSYkb5POe8hIfgomabfDDdxFnKPbR9mcFSIVVRFc0mLgcyTlUFvaeJL_aauXBdmVrTepw-QIrHxgTg5pPeSSVWG1NhpZg2OnYJOJg7-93fUquRdzXilCKVLGdh-JfZ1-nDXHG9s3-HwLA6AHyLO4NCw8X87mcVS60DgZUC3aO-jMA1WPXRzoR0QCOYvqAD3a4eHNiErIcc29g7vwQL7h856YSFnBSeiPDcI_LY2BWmiDaq_rwC1_jm9vY5Nc6nQEXYTb0T3CSLW9pLrLjCir2pIgigW_zQt7w-K_4n_NNs1Ik4M1LeKyFhNe92y7e7wxxh3uDj9iDfsTqJooO0KSvQ7BnUta1LL8b6Gauxu5Lm7MVczOibnZYGNyV6cgC-3oIxdsoMMDvTobIVltkZNF9ynU1buWmTmiTysu140io8CI8VcLkC3PiwR2OwNaOi956UnROlcunuIkeIXqQmO9PH6jGQ1PbTO-_7vG8Eg2ZVGlDsDG3HYwQMPjINNuim3DA1F_HrZDKFXHRP7-U2Ful8ZTBV3ioUM7mFEi78hZVD_T3hngOpS6yjGFcM-A2MWLjKMlDsF9dCDGSGXYbn3UFxjQeQtAHTSMKQDlgr5KizSMEWWIMZS__lxuErK5Z3BKHo_NANpl0xYce2pfJnU7hiliNrfnQwSaDr7pXZZDcxWvVjKl8JozsXxvzSu-kSab67MajPbpxXzE9992oSXYOSrxR3iazQcoro9-8s2d74fzgpRkrIePZQyAYTPjd9GlR6c1M902pn4mCH6kP4fBwCux4lKm_iBwCgwWU-sqp2Kcu9JKUDMSKQhPSR-3QspuFYJJL_kBmL1Nr8rpL83B01sS9JsAnR4dXE7fe-aQK7a2rXyFG2_dIS3M4JHfXS1GUFlpLuZOveahn2_Ys_ZEOZEp9JFaa6FgG6fwnBX_hqQwVcy7Vpl8aGiDFMa2X6nHHC4XdAaVj2-QbND7Mm6pGHNAvYa9CjnpUrT0m-TwnAT6_8S4dpUoifILkiEiRRI-zSVvdSQ==.eyJlbmRwb2ludF9zbHVnIjoib3BlbmFpL2dwdC01LW1pbmktMjAyNS0wOC0wN3xvcGVuYWkifQ","format":"openai-responses-v1","id":"rs_0efd722f56d64447016aa3da9389c487d19b3ba847be53365c","index":0}]},"finish_reason":null,"native_finish_reason":null}]}
     
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":"\":\""}}]},"finish_reason":null,"native_finish_reason":null}]}
+    data: {"id":"gen-1789123218-lQJQblf9vt2mStfLMxVF","object":"chat.completion.chunk","created":1789123218,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"id":"call_NjNRzmeNIFfEhIlY1DJt8Elg","type":"function","function":{"name":"run_me","arguments":""}}]},"finish_reason":null,"native_finish_reason":null}]}
     
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":"foo"}}]},"finish_reason":null,"native_finish_reason":null}]}
+    data: {"id":"gen-1789123218-lQJQblf9vt2mStfLMxVF","object":"chat.completion.chunk","created":1789123218,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":""}}]},"finish_reason":null,"native_finish_reason":null}]}
     
-    data: {"id":"gen-1787325878-ik0WdMQeOFaS3u2d9DmF","object":"chat.completion.chunk","created":1787325878,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":"\"}"}}]},"finish_reason":null,"native_finish_reason":null}]}
+    data: {"id":"gen-1789123218-lQJQblf9vt2mStfLMxVF","object":"chat.completion.chunk","created":1789123218,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":null,"role":"assistant","tool_calls":[{"index":0,"function":{"arguments":"{\"foo\":null,\"bar\":\"foo\"}"}}]},"finish_reason":null,"native_finish_reason":null}]}
     
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+    data: {"id":"gen-1789123218-lQJQblf9vt2mStfLMxVF","object":"chat.completion.chunk","created":1789123218,"model":"openai/gpt-5-mini","provider":"OpenAI","choices":[{"index":0,"delta":{"content":"","role":"assistant","reasoning":null},"finish_reason":"tool_calls","native_finish_reason":"completed"}]}
     
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     data: [DONE]
     
@@ -144,12 +126,12 @@ when:
           "role": "assistant",
           "tool_calls": [
             {
-              "id": "call_KnvO99RwD3rjBcOEPnBpNQ7O",
+              "id": "call_NjNRzmeNIFfEhIlY1DJt8Elg",
               "index": 0,
               "type": "function",
               "function": {
                 "name": "run_me",
-                "arguments": "{\"foo\":null,\"bar\":\"foo\"}"
+                "arguments": "{\"bar\":\"foo\"}"
               }
             }
           ]
@@ -157,7 +139,7 @@ when:
         {
           "role": "tool",
           "content": "working!",
-          "tool_call_id": "call_KnvO99RwD3rjBcOEPnBpNQ7O"
+          "tool_call_id": "call_NjNRzmeNIFfEhIlY1DJt8Elg"
         }
       ],
       "reasoning": {
@@ -174,107 +156,91 @@ then:
   body: |+
     : OPENROUTER PROCESSING
     
-    : OPENROUTER PROCESSING
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     data: [DONE]
     
diff --git a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning__conversation_stream.snap b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning__conversation_stream.snap
index e5926a447..7fc608c91 100644
--- a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning__conversation_stream.snap
+++ b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning__conversation_stream.snap
@@ -245,10 +245,10 @@ expression: v
       "type": "chat_response",
       "reasoning": "",
       "metadata": {
-        "openai_encrypted_content": "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",
+        "openai_encrypted_content": "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",
         "openrouter_metadata": [
           {
-            "id": "cnNfMDg0ODc0OTg2NmUyNDdlYTAxNmE4ODZkYjZmZmYwODdkMWI1YjZlZmQ0MWNjYWM0N2Y=",
+            "id": "cnNfMGVmZDcyMmY1NmQ2NDQ0NzAxNmFhM2RhOTM4OWM0ODdkMTliM2JhODQ3YmU1MzM2NWM=",
             "index": 0,
             "field": "b3BlbmFpX2VuY3J5cHRlZF9jb250ZW50"
           }
@@ -258,10 +258,9 @@ expression: v
     {
       "timestamp": "2020-01-01 00:00:00.0",
       "type": "tool_call_request",
-      "id": "call_KnvO99RwD3rjBcOEPnBpNQ7O",
+      "id": "call_NjNRzmeNIFfEhIlY1DJt8Elg",
       "name": "run_me",
       "arguments": {
-        "foo": null,
         "bar": "Zm9v"
       }
     },
@@ -281,7 +280,7 @@ expression: v
     {
       "timestamp": "2020-01-01 00:00:00.0",
       "type": "tool_call_response",
-      "id": "call_KnvO99RwD3rjBcOEPnBpNQ7O",
+      "id": "call_NjNRzmeNIFfEhIlY1DJt8Elg",
       "content": "d29ya2luZyE=",
       "is_error": false
     },
@@ -290,10 +289,10 @@ expression: v
       "type": "chat_response",
       "reasoning": "",
       "metadata": {
-        "openai_encrypted_content": "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",
+        "openai_encrypted_content": "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",
         "openrouter_metadata": [
           {
-            "id": "cnNfMDUyZDhmZmJiNzA1MTk0NTAxNmE4ODZkYmE4MzI0ODdkMWFiNDcwYTgwZjNlNzVjOTg=",
+            "id": "cnNfMGM5MGM1NmE2M2Q4NjdmYTAxNmFhM2RhOTZiZjI4ODdkMWI2ODYxYzAxYzc5NzZjODQ=",
             "index": 0,
             "field": "b3BlbmFpX2VuY3J5cHRlZF9jb250ZW50"
           }
@@ -303,7 +302,7 @@ expression: v
     {
       "timestamp": "2020-01-01 00:00:00.0",
       "type": "chat_response",
-      "message": "I ran the tool for you. Output returned: \"working!\"\n\nArguments used when calling the tool: {\"foo\": null, \"bar\": \"foo\"}\n\nDo you want me to run it again with different arguments or show more details?"
+      "message": "Done — I ran the tool with the argument {\"bar\":\"foo\"} and it returned: \"working!\". Do you want me to run it again with different arguments or perform something else with the result?"
     }
   ]
 }
diff --git a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning__raw_events.snap b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning__raw_events.snap
index c2cac18d0..83bf6f798 100644
--- a/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning__raw_events.snap
+++ b/crates/jp_llm/tests/fixtures/openrouter/test_tool_call_required_reasoning__raw_events.snap
@@ -10,10 +10,10 @@ expression: v
                 "",
             ),
             metadata: {
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                 "openrouter_metadata": Array [
                     Object {
-                        "id": String("rs_0848749866e247ea016a886db6fff087d1b5b6efd41ccac47f"),
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@@ -24,8 +24,17 @@ expression: v
             index: 2,
             part: ToolCall(
                 Start {
-                    id: "call_KnvO99RwD3rjBcOEPnBpNQ7O",
+                    id: "call_NjNRzmeNIFfEhIlY1DJt8Elg",
                     name: "run_me",
+                    decoding: Some(
+                        ArgumentDecoding {
+                            omit_null: [
+                                "foo",
+                            ],
+                            properties: {},
+                            items: None,
+                        },
+                    ),
                 },
             ),
             metadata: {},
@@ -52,79 +61,7 @@ expression: v
             index: 2,
             part: ToolCall(
                 ArgumentChunk(
-                    "{\"",
-                ),
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 2,
-            part: ToolCall(
-                ArgumentChunk(
-                    "foo",
-                ),
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 2,
-            part: ToolCall(
-                ArgumentChunk(
-                    "\":",
-                ),
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 2,
-            part: ToolCall(
-                ArgumentChunk(
-                    "null",
-                ),
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 2,
-            part: ToolCall(
-                ArgumentChunk(
-                    ",\"",
-                ),
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 2,
-            part: ToolCall(
-                ArgumentChunk(
-                    "bar",
-                ),
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 2,
-            part: ToolCall(
-                ArgumentChunk(
-                    "\":\"",
-                ),
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 2,
-            part: ToolCall(
-                ArgumentChunk(
-                    "foo",
-                ),
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 2,
-            part: ToolCall(
-                ArgumentChunk(
-                    "\"}",
+                    "{\"foo\":null,\"bar\":\"foo\"}",
                 ),
             ),
             metadata: {},
@@ -148,10 +85,10 @@ expression: v
                 "",
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                 "openrouter_metadata": Array [
                     Object {
-                        "id": String("rs_052d8ffbb7051945016a886dba832487d1ab470a80f3e75c98"),
+                        "id": String("rs_0c90c56a63d867fa016aa3da96bf2887d1b6861c01c7976c84"),
                         "index": Number(0),
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@@ -161,133 +98,119 @@ expression: v
         Part {
             index: 1,
             part: Message(
-                "I",
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 1,
-            part: Message(
-                " ran",
-            ),
-            metadata: {},
-        },
-        Part {
-            index: 1,
-            part: Message(
-                " the",
+                "Done",
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             index: 1,
             part: Message(
-                " tool",
+                " —",
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-                " for",
+                " I",
             ),
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             index: 1,
             part: Message(
-                " you",
+                " ran",
             ),
             metadata: {},
         },
         Part {
             index: 1,
             part: Message(
-                ".",
+                " the",
             ),
             metadata: {},
         },
         Part {
             index: 1,
             part: Message(
-                " Output",
+                " tool",
             ),
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             index: 1,
             part: Message(
-                " returned",
+                " with",
             ),
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-                ":",
+                " the",
             ),
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             part: Message(
-                " \"",
+                " argument",
             ),
             metadata: {},
         },
         Part {
             index: 1,
             part: Message(
-                "working",
+                " {\"",
             ),
             metadata: {},
         },
         Part {
             index: 1,
             part: Message(
-                "!\"\n\n",
+                "bar",
             ),
             metadata: {},
         },
         Part {
             index: 1,
             part: Message(
-                "Arguments",
+                "\":\"",
             ),
             metadata: {},
         },
         Part {
             index: 1,
             part: Message(
-                " used",
+                "foo",
             ),
             metadata: {},
         },
         Part {
             index: 1,
             part: Message(
-                " when",
+                "\"}",
             ),
             metadata: {},
         },
         Part {
             index: 1,
             part: Message(
-                " calling",
+                " and",
             ),
             metadata: {},
         },
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             index: 1,
             part: Message(
-                " the",
+                " it",
             ),
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             index: 1,
             part: Message(
-                " tool",
+                " returned",
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@@ -298,41 +221,6 @@ expression: v
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-            part: Message(
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-            part: Message(
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-            metadata: {},
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@@ -343,140 +231,140 @@ expression: v
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             part: Message(
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+                "working",
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             metadata: {},
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             part: Message(
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-                "foo",
+                " you",
             ),
             metadata: {},
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             index: 1,
             part: Message(
-                "\"}\n\n",
+                " want",
             ),
             metadata: {},
         },
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-                "Do",
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+                " to",
             ),
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             index: 1,
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+                " again",
             ),
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             part: Message(
-                " run",
+                " with",
             ),
             metadata: {},
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             part: Message(
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             index: 1,
             part: Message(
-                " again",
+                " arguments",
             ),
             metadata: {},
         },
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             index: 1,
             part: Message(
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+                " or",
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         Part {
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         Part {
             index: 1,
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