diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index 7a0e0af..4021196 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "agentic-rtb-framework-service"
@@ -11,6 +11,7 @@ dependencies = [
  "futures-util",
  "hyper 0.14.32",
  "prost",
+ "prost-reflect",
  "rustc-hash",
  "serde_json",
  "tokio",
@@ -18,6 +19,7 @@ dependencies = [
  "tonic",
  "tonic-prost",
  "tonic-prost-build",
+ "tonic-reflection",
 ]
 
 [[package]]
@@ -74,6 +76,12 @@ version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0"
 
+[[package]]
+name = "autocfg"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2032f911046de80f0a198e0901378627c33f59ea0ac00e363d481118bd70a53"
+
 [[package]]
 name = "axum"
 version = "0.8.8"
@@ -567,12 +575,30 @@ version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d87ecb2933e8aeadb3e3a02b828fed80a7528047e68b4f424523a0981a3a084"
 
+[[package]]
+name = "num-traits"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.21.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
 
+[[package]]
+name = "ordered-float"
+version = "2.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68f19d67e5a2795c94e73e0bb1cc1a7edeb2e28efd39e2e1c9b7a40c1108b11c"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.2"
@@ -685,6 +711,19 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "prost-reflect"
+version = "0.16.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "590aa145fee8f7a26b5a6055365e7c5e89a5c1caae9869de76ec0ee73181a2f9"
+dependencies = [
+ "base64",
+ "prost",
+ "prost-types",
+ "serde",
+ "serde-value",
+]
+
 [[package]]
 name = "prost-types"
 version = "0.14.3"
@@ -792,6 +831,16 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "serde-value"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3a1a3341211875ef120e117ea7fd5228530ae7e7036a779fdc9117be6b3282c"
+dependencies = [
+ "ordered-float",
+ "serde",
+]
+
 [[package]]
 name = "serde_core"
 version = "1.0.228"
@@ -939,9 +988,9 @@ dependencies = [
 
 [[package]]
 name = "tonic"
-version = "0.14.3"
+version = "0.14.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a286e33f82f8a1ee2df63f4fa35c0becf4a85a0cb03091a15fd7bf0b402dc94a"
+checksum = "ac2a5518c70fa84342385732db33fb3f44bc4cc748936eb5833d2df34d6445ef"
 dependencies = [
  "async-trait",
  "axum",
@@ -980,9 +1029,9 @@ dependencies = [
 
 [[package]]
 name = "tonic-prost"
-version = "0.14.3"
+version = "0.14.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d6c55a2d6a14174563de34409c9f92ff981d006f56da9c6ecd40d9d4a31500b0"
+checksum = "50849f68853be452acf590cde0b146665b8d507b3b8af17261df47e02c209ea0"
 dependencies = [
  "bytes",
  "prost",
@@ -1005,6 +1054,20 @@ dependencies = [
  "tonic-build",
 ]
 
+[[package]]
+name = "tonic-reflection"
+version = "0.14.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "acccd136a4bf19810a1fde9c74edc6129b42a66b44d0c1c8aaa67aeb49a146a7"
+dependencies = [
+ "prost",
+ "prost-types",
+ "tokio",
+ "tokio-stream",
+ "tonic",
+ "tonic-prost",
+]
+
 [[package]]
 name = "tower"
 version = "0.5.3"
diff --git a/rust/build.rs b/rust/build.rs
index c181492..426bd24 100644
--- a/rust/build.rs
+++ b/rust/build.rs
@@ -1,8 +1,13 @@
+use std::env;
+use std::path::PathBuf;
+
 fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let descriptor_path = PathBuf::from(env::var("OUT_DIR")?).join("artf_descriptor.bin");
     tonic_prost_build::configure()
         .build_server(true)
         .build_client(false)
         .out_dir("./src")
+        .file_descriptor_set_path(descriptor_path)
         .compile_protos(&["./proto/agenticrtbframeworkservices.proto"], &["proto"])?;
     Ok(())
-}
\ No newline at end of file
+}
diff --git a/rust/cargo.toml b/rust/cargo.toml
index 31bd579..7c412ef 100644
--- a/rust/cargo.toml
+++ b/rust/cargo.toml
@@ -21,6 +21,7 @@ tokio-stream = "0.1.17"
 async-stream = "0.3.6"
 futures = "0.3.31"
 futures-util = "0.3.31"
+tonic-reflection = "0.14.6"
 
 [build-dependencies]
 tonic-prost-build = "0.14.2"
@@ -30,3 +31,6 @@ strip = true  # Automatically strip symbols from the binary.
 opt-level = "z"  # Optimize for size.
 lto = true  # Enable link-time optimization.
 codegen-units = 1  # Use a single codegen unit to reduce binary size.
+
+[dev-dependencies]
+prost-reflect = { version = "0.16.4", features = ["serde"] }
diff --git a/rust/src/bidder/evaluator.rs b/rust/src/bidder/evaluator.rs
index 0eaeb5b..85b0975 100644
--- a/rust/src/bidder/evaluator.rs
+++ b/rust/src/bidder/evaluator.rs
@@ -13,7 +13,16 @@ pub async fn evaluate(req: RtbRequest) -> RtbResponse {
     // and determine the appropriate mutations based on the request data.
     let metadata = build_metadata();
 
-    match req.id.as_str() {
+    // Route on the auction id carried by the enclosed bid request; the
+    // top-level `req.id` is the extension point envelope id assigned by the
+    // exchange and is only echoed back in the response.
+    let auction_id = req
+        .bid_request
+        .as_ref()
+        .and_then(|bid_request| bid_request.id.clone())
+        .unwrap_or_default();
+
+    match auction_id.as_str() {
         "auction-123" => RtbResponse {
             id: req.id,
             mutations: vec![
@@ -49,7 +58,7 @@ pub async fn evaluate(req: RtbRequest) -> RtbResponse {
             ],
             metadata: Some(metadata),
         },
-        "app-123" => RtbResponse {
+        "auction-native-123" => RtbResponse {
             id: req.id,
             mutations: vec![
                 activate_segments(&["demo-18-24"]),
@@ -64,3 +73,99 @@ pub async fn evaluate(req: RtbRequest) -> RtbResponse {
         },
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::mutation::types::{PATH_IMP_1, PATH_SEATBID_BID_ABC, PATH_USER_SEGMENT};
+    use crate::proto::com::iabtechlab::bidstream::mutation::v1::{
+        mutation::Value, Intent, Operation,
+    };
+    use crate::proto::com::iabtechlab::openrtb::v2::BidRequest;
+
+    fn request(envelope_id: &str, auction_id: &str) -> RtbRequest {
+        RtbRequest {
+            id: envelope_id.to_string(),
+            bid_request: Some(BidRequest {
+                id: Some(auction_id.to_string()),
+                ..Default::default()
+            }),
+            ..Default::default()
+        }
+    }
+
+    #[tokio::test]
+    async fn known_auctions_produce_expected_mutation_counts() {
+        let cases = [
+            ("auction-123", 2),
+            ("auction-456", 2),
+            ("auction-789", 3),
+            ("auction-multi-123", 4),
+            ("auction-native-123", 2),
+        ];
+        for (auction_id, expected) in cases {
+            let response = evaluate(request("req-1", auction_id)).await;
+            assert_eq!(response.mutations.len(), expected, "auction {auction_id}");
+            assert!(response.metadata.is_some(), "auction {auction_id}");
+        }
+    }
+
+    #[tokio::test]
+    async fn response_echoes_envelope_id_not_auction_id() {
+        let response = evaluate(request("envelope-42", "auction-123")).await;
+        assert_eq!(response.id, "envelope-42");
+    }
+
+    #[tokio::test]
+    async fn segment_and_deal_mutations_carry_expected_fields() {
+        let response = evaluate(request("req-1", "auction-123")).await;
+
+        let segments = &response.mutations[0];
+        assert_eq!(segments.intent, Intent::ActivateSegments as i32);
+        assert_eq!(segments.op, Operation::Add as i32);
+        assert_eq!(segments.path, PATH_USER_SEGMENT);
+        match segments.value.as_ref() {
+            Some(Value::Ids(ids)) => {
+                assert_eq!(ids.id, vec!["seg-sports", "demo-25-35", "gender-male"])
+            }
+            other => panic!("expected IDs payload, got {other:?}"),
+        }
+
+        let deals = &response.mutations[1];
+        assert_eq!(deals.intent, Intent::ActivateDeals as i32);
+        assert_eq!(deals.op, Operation::Add as i32);
+        assert_eq!(deals.path, PATH_IMP_1);
+    }
+
+    #[tokio::test]
+    async fn bid_shade_mutation_replaces_price_at_bid_path() {
+        let response = evaluate(request("req-1", "auction-789")).await;
+
+        let shade = response.mutations.last().expect("bid shade mutation");
+        assert_eq!(shade.intent, Intent::BidShade as i32);
+        assert_eq!(shade.op, Operation::Replace as i32);
+        assert_eq!(shade.path, PATH_SEATBID_BID_ABC);
+        match shade.value.as_ref() {
+            Some(Value::AdjustBid(adjust)) => assert_eq!(adjust.price, 4.675),
+            other => panic!("expected AdjustBid payload, got {other:?}"),
+        }
+    }
+
+    #[tokio::test]
+    async fn unknown_auction_returns_no_mutations() {
+        let response = evaluate(request("req-1", "auction-unknown")).await;
+        assert!(response.mutations.is_empty());
+        assert!(response.metadata.is_some());
+    }
+
+    #[tokio::test]
+    async fn missing_bid_request_returns_no_mutations() {
+        let request = RtbRequest {
+            id: "req-1".to_string(),
+            ..Default::default()
+        };
+        let response = evaluate(request).await;
+        assert_eq!(response.id, "req-1");
+        assert!(response.mutations.is_empty());
+    }
+}
diff --git a/rust/src/main.rs b/rust/src/main.rs
index c182fe9..fd81025 100644
--- a/rust/src/main.rs
+++ b/rust/src/main.rs
@@ -10,12 +10,18 @@ mod bidder;
 mod config;
 mod mutation;
 mod proto;
+#[cfg(test)]
+mod sample_tests;
 mod service;
 
 use crate::config::{Config, API_VERSION, MODEL_VERSION};
 use crate::proto::com::iabtechlab::bidstream::mutation::services::v1::rtb_extension_point_server::RtbExtensionPointServer;
 use crate::service::{handle_rest, RtbExtensionPointService};
 
+/// File descriptor set emitted by `build.rs`, served via gRPC reflection so
+/// clients like grpcurl can discover the service without local proto files.
+const FILE_DESCRIPTOR_SET: &[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/artf_descriptor.bin"));
+
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let config = Config::from_env();
@@ -41,11 +47,16 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         address, config.http_port
     );
 
+    let reflection_service = tonic_reflection::server::Builder::configure()
+        .register_encoded_file_descriptor_set(FILE_DESCRIPTOR_SET)
+        .build_v1()?;
+
     let max_server_connection = config.max_server_connection;
     let grpc_server = tokio::spawn(async move {
         Server::builder()
             .concurrency_limit_per_connection(max_server_connection as usize)
             .add_service(agentic_rtb_framework_service)
+            .add_service(reflection_service)
             .serve(grpc_addr)
             .await
 
diff --git a/rust/src/mutation/builder.rs b/rust/src/mutation/builder.rs
index 1763cf2..4237468 100644
--- a/rust/src/mutation/builder.rs
+++ b/rust/src/mutation/builder.rs
@@ -49,3 +49,51 @@ fn ids_payload(ids: &[&str]) -> IDsPayload {
         id: ids.iter().map(|id| id.to_string()).collect(),
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn metadata_uses_configured_versions() {
+        let metadata = build_metadata();
+        assert_eq!(metadata.api_version, API_VERSION);
+        assert_eq!(metadata.model_version, MODEL_VERSION);
+    }
+
+    #[test]
+    fn activate_segments_adds_ids_at_user_segment_path() {
+        let mutation = activate_segments(&["seg-1", "seg-2"]);
+        assert_eq!(mutation.intent, Intent::ActivateSegments as i32);
+        assert_eq!(mutation.op, Operation::Add as i32);
+        assert_eq!(mutation.path, PATH_USER_SEGMENT);
+        match mutation.value {
+            Some(Value::Ids(ids)) => assert_eq!(ids.id, vec!["seg-1", "seg-2"]),
+            other => panic!("expected IDs payload, got {other:?}"),
+        }
+    }
+
+    #[test]
+    fn activate_deals_adds_ids_at_given_path() {
+        let mutation = activate_deals("/imp/imp-1", &["deal-1"]);
+        assert_eq!(mutation.intent, Intent::ActivateDeals as i32);
+        assert_eq!(mutation.op, Operation::Add as i32);
+        assert_eq!(mutation.path, "/imp/imp-1");
+        match mutation.value {
+            Some(Value::Ids(ids)) => assert_eq!(ids.id, vec!["deal-1"]),
+            other => panic!("expected IDs payload, got {other:?}"),
+        }
+    }
+
+    #[test]
+    fn bid_shade_replaces_price_at_given_path() {
+        let mutation = bid_shade("/seatbid/dsp-001/bid/bid-abc", 4.675);
+        assert_eq!(mutation.intent, Intent::BidShade as i32);
+        assert_eq!(mutation.op, Operation::Replace as i32);
+        assert_eq!(mutation.path, "/seatbid/dsp-001/bid/bid-abc");
+        match mutation.value {
+            Some(Value::AdjustBid(adjust)) => assert_eq!(adjust.price, 4.675),
+            other => panic!("expected AdjustBid payload, got {other:?}"),
+        }
+    }
+}
diff --git a/rust/src/sample_tests.rs b/rust/src/sample_tests.rs
new file mode 100644
index 0000000..f28b746
--- /dev/null
+++ b/rust/src/sample_tests.rs
@@ -0,0 +1,94 @@
+//! Tests that exercise the bundled sample payloads in `samples/`.
+//!
+//! Each sample must decode as a schema-valid `RtbRequest` (proto3 JSON
+//! mapping, unknown fields rejected) and drive the demo evaluator to the
+//! mutations its scenario describes. This keeps the shared sample payloads
+//! and the reference implementation from drifting apart.
+
+use prost_reflect::{DescriptorPool, DynamicMessage};
+
+use crate::bidder::evaluate;
+use crate::proto::com::iabtechlab::bidstream::mutation::v1::{mutation::Value, Intent, RtbRequest};
+
+const DESCRIPTOR_BYTES: &[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/artf_descriptor.bin"));
+
+const SAMPLES: [&str; 5] = [
+    "banner-basic.json",
+    "video-deals.json",
+    "bid-shading.json",
+    "multi-impression.json",
+    "native-ad.json",
+];
+
+fn load_sample(name: &str) -> RtbRequest {
+    let path = format!("{}/../samples/{}", env!("CARGO_MANIFEST_DIR"), name);
+    let json = std::fs::read_to_string(&path)
+        .unwrap_or_else(|error| panic!("failed to read {path}: {error}"));
+
+    let pool = DescriptorPool::decode(DESCRIPTOR_BYTES).expect("descriptor set");
+    let descriptor = pool
+        .get_message_by_name("com.iabtechlab.bidstream.mutation.v1.RTBRequest")
+        .expect("RTBRequest descriptor");
+
+    let mut deserializer = serde_json::Deserializer::from_str(&json);
+    let message = DynamicMessage::deserialize(descriptor, &mut deserializer)
+        .unwrap_or_else(|error| panic!("{name} is not a valid RtbRequest payload: {error}"));
+    deserializer.end().expect("trailing JSON content");
+
+    message.transcode_to().expect("transcode to RtbRequest")
+}
+
+#[test]
+fn all_samples_decode_as_rtb_requests() {
+    for name in SAMPLES {
+        let request = load_sample(name);
+        assert!(!request.id.is_empty(), "{name} carries an envelope id");
+        assert!(
+            request.bid_request.is_some(),
+            "{name} carries a bid_request"
+        );
+        assert!(
+            !request.applicable_intents.is_empty(),
+            "{name} declares applicable intents"
+        );
+    }
+}
+
+#[tokio::test]
+async fn samples_drive_demo_evaluator_mutations() {
+    let cases = [
+        ("banner-basic.json", 2),
+        ("video-deals.json", 2),
+        ("bid-shading.json", 3),
+        ("multi-impression.json", 4),
+        ("native-ad.json", 2),
+    ];
+    for (name, expected_mutations) in cases {
+        let request = load_sample(name);
+        let envelope_id = request.id.clone();
+
+        let response = evaluate(request).await;
+
+        assert_eq!(response.id, envelope_id, "{name} echoes the envelope id");
+        assert_eq!(
+            response.mutations.len(),
+            expected_mutations,
+            "{name} produces the demo mutations for its scenario"
+        );
+        assert!(response.metadata.is_some(), "{name} carries metadata");
+    }
+}
+
+#[tokio::test]
+async fn bid_shading_sample_produces_bid_shade_mutation() {
+    let response = evaluate(load_sample("bid-shading.json")).await;
+    let shade = response
+        .mutations
+        .iter()
+        .find(|mutation| mutation.intent == Intent::BidShade as i32)
+        .expect("bid shade mutation");
+    match shade.value.as_ref() {
+        Some(Value::AdjustBid(adjust)) => assert!(adjust.price > 0.0),
+        other => panic!("expected AdjustBid payload, got {other:?}"),
+    }
+}
diff --git a/samples/multi-impression.json b/samples/multi-impression.json
index e6681a0..e9157b5 100644
--- a/samples/multi-impression.json
+++ b/samples/multi-impression.json
@@ -111,7 +111,7 @@
       "devicetype": 2,
       "ip": "203.0.113.50",
       "language": "en",
-      "js": 1,
+      "js": true,
       "geo": {
         "country": "USA",
         "region": "TX",
@@ -119,12 +119,12 @@
       }
     },
     "regs": {
-      "coppa": 0,
-      "gdpr": 0,
+      "coppa": false,
+      "gdpr": false,
       "us_privacy": "1YNN"
     },
     "source": {
-      "fd": 1,
+      "fd": true,
       "tid": "transaction-abc-123"
     },
     "at": 1,
diff --git a/samples/native-ad.json b/samples/native-ad.json
index f06420d..9fa4040 100644
--- a/samples/native-ad.json
+++ b/samples/native-ad.json
@@ -60,7 +60,7 @@
       "w": 390,
       "h": 844,
       "pxratio": 3.0,
-      "js": 1,
+      "js": true,
       "language": "en",
       "connectiontype": 6,
       "ifa": "8A2E0A2B-3C4D-5E6F-7A8B-9C0D1E2F3A4B",
@@ -75,7 +75,7 @@
       }
     },
     "regs": {
-      "coppa": 0
+      "coppa": false
     }
   }
 }