diff --git a/packages/effect/README.md b/packages/effect/README.md
index 4c7b750..a9e0f43 100644
--- a/packages/effect/README.md
+++ b/packages/effect/README.md
@@ -23,8 +23,8 @@ against their concrete API shapes:
 | `effect`                 | `3.22.2` | `Effect`, `Layer`, `Stream`, `Schema`, `Context`, `Data`                                                   |
 | `@effect/ai`             | `0.37.0` | `LanguageModel.make` (`ProviderOptions` → encoded response parts), `AiError`, `Prompt`, `Response`, `Tool` |
 | `@ai-sdk/provider`       | `4.0.14` | `LanguageModelV4` spec types (same pin as `@coder/ai-sdk-provider`)                                        |
-| `@coder/ai-sdk-provider` | `0.4.14` | `createCoder`, `CoderProviderSettings` (published release, not `workspace:*` — see below)                  |
-| `@coder/ai-sdk-sandbox`  | `0.4.17` | `ensureCoderWorkspace`, `createCoderWorkspace`, `CoderTransport`                                           |
+| `@coder/ai-sdk-provider` | `0.4.15` | `createCoder`, `CoderProviderSettings` (published release, not `workspace:*` — see below)                  |
+| `@coder/ai-sdk-sandbox`  | `0.4.18` | `ensureCoderWorkspace`, `createCoderWorkspace`, `CoderTransport`                                           |
 
 The spike depends on the _published_ `@coder/ai-sdk-*` releases rather than
 `workspace:*` so that repo-wide `typecheck`/`test` need no cross-package build
diff --git a/packages/effect/package.json b/packages/effect/package.json
index e81d197..ca69632 100644
--- a/packages/effect/package.json
+++ b/packages/effect/package.json
@@ -43,8 +43,8 @@
   },
   "dependencies": {
     "@ai-sdk/provider": "4.0.14",
-    "@coder/ai-sdk-provider": "0.4.14",
-    "@coder/ai-sdk-sandbox": "0.4.17",
+    "@coder/ai-sdk-provider": "0.4.15",
+    "@coder/ai-sdk-sandbox": "0.4.18",
     "@effect/ai": "0.37.0",
     "effect": "3.22.2"
   },
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index add9a81..c3285ea 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -66,11 +66,11 @@ importers:
         specifier: 4.0.14
         version: 4.0.14
       '@coder/ai-sdk-provider':
-        specifier: 0.4.14
-        version: 0.4.14(ai@7.0.100(zod@4.6.5))(zod@4.6.5)
+        specifier: 0.4.15
+        version: 0.4.15(ai@7.0.100(zod@4.6.5))(zod@4.6.5)
       '@coder/ai-sdk-sandbox':
-        specifier: 0.4.17
-        version: 0.4.17(@ai-sdk/harness@1.0.110(ws@8.21.3)(zod@4.6.5))(@ai-sdk/provider-utils@5.0.40(zod@4.6.5))
+        specifier: 0.4.18
+        version: 0.4.18(@ai-sdk/harness@1.0.110(ws@8.21.3)(zod@4.6.5))(@ai-sdk/provider-utils@5.0.40(zod@4.6.5))
       '@effect/ai':
         specifier: 0.37.0
         version: 0.37.0(@effect/experimental@0.61.1(@effect/platform@0.97.2(effect@3.22.2))(effect@3.22.2))(@effect/platform@0.97.2(effect@3.22.2))(@effect/rpc@0.76.2(@effect/platform@0.97.2(effect@3.22.2))(effect@3.22.2))(effect@3.22.2)
@@ -343,8 +343,8 @@ packages:
   '@braidai/lang@1.1.2':
     resolution: {integrity: sha512-qBcknbBufNHlui137Hft8xauQMTZDKdophmLFv05r2eNmdIv/MlPuP4TdUknHG68UdWLgVZwgxVe735HzJNIwA==}
 
-  '@coder/ai-sdk-provider@0.4.14':
-    resolution: {integrity: sha512-SZwgLhXpK2BAV3XCCr497KQSIP/d6ZNPzr57vK3eNro6GACfrxbmni8nEzqXvinDzq201sFrQsd7c20ZT4k1DQ==}
+  '@coder/ai-sdk-provider@0.4.15':
+    resolution: {integrity: sha512-5g0tL7CaqrfGOImMIDWC1dvfVEzG5Exuu4bWSGjXv5ic7ZdfXuvZl8ElBR/eNtg1e3UscpU1VnzoUk3gXlBPMA==}
     engines: {node: '>=22'}
     peerDependencies:
       ai: ^7.0.0
@@ -353,8 +353,8 @@ packages:
       zod:
         optional: true
 
-  '@coder/ai-sdk-sandbox@0.4.17':
-    resolution: {integrity: sha512-L1IEPoD+7SntR7NPmSu0ONzZzVV9ubunW8T3os5CWeSv/CGUECG8/QkKSrRGAcNNUlNHQCw1iJQbaiXJPFaPkw==}
+  '@coder/ai-sdk-sandbox@0.4.18':
+    resolution: {integrity: sha512-xOPW/xd4EBZ5eL0QwEl8PpxO/cXZqdT+LIF+r3Cixfxn7YUVSZD23v4qJohLg2bjRPENnb708eibygLvDBDLMg==}
     engines: {node: '>=22'}
     peerDependencies:
       '@ai-sdk/harness': ^1.0.0
@@ -2575,7 +2575,7 @@ snapshots:
 
   '@braidai/lang@1.1.2': {}
 
-  '@coder/ai-sdk-provider@0.4.14(ai@7.0.100(zod@4.6.5))(zod@4.6.5)':
+  '@coder/ai-sdk-provider@0.4.15(ai@7.0.100(zod@4.6.5))(zod@4.6.5)':
     dependencies:
       '@ai-sdk/anthropic': 4.0.53(zod@4.6.5)
       '@ai-sdk/openai-compatible': 3.0.48(zod@4.6.5)
@@ -2584,7 +2584,7 @@ snapshots:
     optionalDependencies:
       zod: 4.6.5
 
-  '@coder/ai-sdk-sandbox@0.4.17(@ai-sdk/harness@1.0.110(ws@8.21.3)(zod@4.6.5))(@ai-sdk/provider-utils@5.0.40(zod@4.6.5))':
+  '@coder/ai-sdk-sandbox@0.4.18(@ai-sdk/harness@1.0.110(ws@8.21.3)(zod@4.6.5))(@ai-sdk/provider-utils@5.0.40(zod@4.6.5))':
     dependencies:
       '@ai-sdk/harness': 1.0.110(ws@8.21.3)(zod@4.6.5)
       '@ai-sdk/provider-utils': 5.0.40(zod@4.6.5)
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index 39126ab..32124d1 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -38,5 +38,5 @@ minimumReleaseAgeExclude:
   - "@ai-sdk/tui"
   - "ai"
   - "@ai-sdk/mcp@2.0.32 || 2.0.37 || 2.0.39 || 2.0.40 || 2.0.41 || 2.0.42 || 2.0.43 || 2.0.44 || 2.0.45 || 2.0.46"
-  - "@coder/ai-sdk-provider@0.4.14"
-  - "@coder/ai-sdk-sandbox@0.4.17"
+  - "@coder/ai-sdk-provider@0.4.15"
+  - "@coder/ai-sdk-sandbox@0.4.18"