tim-smart · Oct 4, 2026 · Oct 4, 2026
diff --git a/.changeset/anthropic-streamed-tool-json-errors.md b/.changeset/anthropic-streamed-tool-json-errors.md
diff --git a/.changeset/anthropic-system-history.md b/.changeset/anthropic-system-history.md
diff --git a/.changeset/cache-tool-response-schemas.md b/.changeset/cache-tool-response-schemas.md
diff --git a/.changeset/cached-interruption-abandonment.md b/.changeset/cached-interruption-abandonment.md
diff --git a/.changeset/cached-invalidate-with-ttl-callback.md b/.changeset/cached-invalidate-with-ttl-callback.md
diff --git a/.changeset/cloudflare-clef-decision-model.md b/.changeset/cloudflare-clef-decision-model.md
diff --git a/.changeset/cluster-entity-built-after-shard-release.md b/.changeset/cluster-entity-built-after-shard-release.md
diff --git a/.changeset/cluster-workflow-unawaited-checkpoints.md b/.changeset/cluster-workflow-unawaited-checkpoints.md
diff --git a/.changeset/fix-cluster-defect-replay-recovery.md b/.changeset/fix-cluster-defect-replay-recovery.md
diff --git a/.changeset/fix-cluster-reset-lock-order.md b/.changeset/fix-cluster-reset-lock-order.md
diff --git a/.changeset/fix-datetime-missing-fractional-seconds.md b/.changeset/fix-datetime-missing-fractional-seconds.md
diff --git a/.changeset/fix-duplex-reader-reentrancy.md b/.changeset/fix-duplex-reader-reentrancy.md
diff --git a/.changeset/fix-fiber-async-context-leak.md b/.changeset/fix-fiber-async-context-leak.md
diff --git a/.changeset/fix-hashring-deterministic-shards.md b/.changeset/fix-hashring-deterministic-shards.md
diff --git a/.changeset/fix-http-api-schema-error-reporting.md b/.changeset/fix-http-api-schema-error-reporting.md
diff --git a/.changeset/fix-http-client-abort-logging.md b/.changeset/fix-http-client-abort-logging.md
diff --git a/.changeset/fix-http-trace-context.md b/.changeset/fix-http-trace-context.md
diff --git a/.changeset/fix-interrupted-uninterruptible-failure.md b/.changeset/fix-interrupted-uninterruptible-failure.md
diff --git a/.changeset/fix-json-schema-pattern-source.md b/.changeset/fix-json-schema-pattern-source.md
diff --git a/.changeset/fix-mcp-schema-optional-encode.md b/.changeset/fix-mcp-schema-optional-encode.md
diff --git a/.changeset/fix-mssql-connection-lifecycle.md b/.changeset/fix-mssql-connection-lifecycle.md
diff --git a/.changeset/fix-node-file-response-stream-lifetime.md b/.changeset/fix-node-file-response-stream-lifetime.md
diff --git a/.changeset/fix-openapi-include-response.md b/.changeset/fix-openapi-include-response.md
diff --git a/.changeset/fix-process-group-nonzero-exit-cleanup.md b/.changeset/fix-process-group-nonzero-exit-cleanup.md
diff --git a/.changeset/fix-sharding-refresh-acquire-race.md b/.changeset/fix-sharding-refresh-acquire-race.md
diff --git a/.changeset/fix-singleton-shard-reassignment-cancellation.md b/.changeset/fix-singleton-shard-reassignment-cancellation.md
diff --git a/.changeset/fix-static-server-if-range.md b/.changeset/fix-static-server-if-range.md
diff --git a/.changeset/fix-stream-scan-empty.md b/.changeset/fix-stream-scan-empty.md
diff --git a/.changeset/fix-stream-throttle-shape-rate.md b/.changeset/fix-stream-throttle-shape-rate.md
diff --git a/.changeset/fix-vitest-assert-undefined-message.md b/.changeset/fix-vitest-assert-undefined-message.md
diff --git a/.changeset/mcp-stateful-extensions.md b/.changeset/mcp-stateful-extensions.md
diff --git a/.changeset/mcp-subscription-keepalive.md b/.changeset/mcp-subscription-keepalive.md
diff --git a/.changeset/openai-prompt-cache-diagnostics.md b/.changeset/openai-prompt-cache-diagnostics.md
diff --git a/.changeset/openrouter-transcription-json.md b/.changeset/openrouter-transcription-json.md
diff --git a/.changeset/pool-usage-idle-timeout.md b/.changeset/pool-usage-idle-timeout.md
diff --git a/.changeset/quiet-pandas-return.md b/.changeset/quiet-pandas-return.md
diff --git a/.changeset/rpc-abandoned-stream-buffer.md b/.changeset/rpc-abandoned-stream-buffer.md
diff --git a/.changeset/rpc-chunk-decode-isolation.md b/.changeset/rpc-chunk-decode-isolation.md
diff --git a/.changeset/rpc-client-protocol-error-broadcast.md b/.changeset/rpc-client-protocol-error-broadcast.md
diff --git a/.changeset/rpc-stdio-drain.md b/.changeset/rpc-stdio-drain.md
diff --git a/.changeset/scoped-cache-stamp-ttl-before-completing.md b/.changeset/scoped-cache-stamp-ttl-before-completing.md
diff --git a/.changeset/sql-pg-default-idle-timeout.md b/.changeset/sql-pg-default-idle-timeout.md
diff --git a/.changeset/sqlite-cached-statement-result-rows.md b/.changeset/sqlite-cached-statement-result-rows.md
diff --git a/.changeset/sqlite-node-prepare-failures.md b/.changeset/sqlite-node-prepare-failures.md
diff --git a/.changeset/sqlite-wal-initialization.md b/.changeset/sqlite-wal-initialization.md
diff --git a/.changeset/stream-aggregate-within-idle.md b/.changeset/stream-aggregate-within-idle.md
diff --git a/.changeset/ws-upgrade-refused.md b/.changeset/ws-upgrade-refused.md
diff --git a/packages/ai/anthropic/CHANGELOG.md b/packages/ai/anthropic/CHANGELOG.md
@@ -1,5 +1,15 @@
 # @effect/ai-anthropic
 
+## 4.0.1
+
+### Patch Changes
+
+- [#8683](https://github.com/Effect-TS/effect/pull/8683) [`97ee2bd`](https://github.com/Effect-TS/effect/commit/97ee2bd6840bdfb51b65ec35b9a19001ee93db60) Thanks @tim-smart! - Return an `AiError` with `ToolParameterValidationError` instead of a defect when streamed Anthropic tool arguments contain malformed JSON, including provider-executed tool calls.
+
+- [#8603](https://github.com/Effect-TS/effect/pull/8603) [`ed2cc2f`](https://github.com/Effect-TS/effect/commit/ed2cc2f322dfd24da550c8d0ac811c3130b79d74) Thanks @danieljvdm! - Preserve all Anthropic system instructions and support configurable mid-conversation system messages. Add optional `LanguageModel.supportsSystemMessagesInHistory` to query support with scoped overrides.
+- Updated dependencies [[`ed2cc2f`](https://github.com/Effect-TS/effect/commit/ed2cc2f322dfd24da550c8d0ac811c3130b79d74), [`58a2ee8`](https://github.com/Effect-TS/effect/commit/58a2ee8e0db8e0a90bae83c6cceeff6916772fee), [`bc44526`](https://github.com/Effect-TS/effect/commit/bc445262eeaaba6f7f28a154023a590e193e547d), [`073bb47`](https://github.com/Effect-TS/effect/commit/073bb475d1e84e09cdcd8303a4a558f2a73d8396), [`2ec021e`](https://github.com/Effect-TS/effect/commit/2ec021eff7fbd2206adc3e8bf4e803ed4bf07d6a), [`cad1118`](https://github.com/Effect-TS/effect/commit/cad111867a666cebe8ff9bf2237a997fa6e4cb14), [`1672d9c`](https://github.com/Effect-TS/effect/commit/1672d9ca8da3e5b536bf7afb73365cccc6c01f53), [`a81e4e6`](https://github.com/Effect-TS/effect/commit/a81e4e6cb3dfbf01b1c53c1c877fddeaced8a278), [`f5c2a91`](https://github.com/Effect-TS/effect/commit/f5c2a91621401a018b770446d35ef99806c5561f), [`498e72b`](https://github.com/Effect-TS/effect/commit/498e72ba14d0191d6bf66cc0e931c229a1ff442f), [`cabf123`](https://github.com/Effect-TS/effect/commit/cabf1230723e92684a4b0b836ccfde25c657f9f1), [`a5b1d4e`](https://github.com/Effect-TS/effect/commit/a5b1d4e4cae01dbe30890d3796f846bda00ad2ae), [`878cb33`](https://github.com/Effect-TS/effect/commit/878cb33f4f5f5a31d2c80a9ddb7d62a611230e1c), [`5e6f756`](https://github.com/Effect-TS/effect/commit/5e6f7568a4c895eab3087249b191c5dcba5e73ef), [`18dfb98`](https://github.com/Effect-TS/effect/commit/18dfb98cf6d2aeedbab8ef5734f9bc273a82d56e), [`04706ef`](https://github.com/Effect-TS/effect/commit/04706eff5da94b4d475b99eab8b0256bed97b080), [`f157482`](https://github.com/Effect-TS/effect/commit/f15748273a89afff4b05d5e6bec22c567c2a3cda), [`b5a2d4c`](https://github.com/Effect-TS/effect/commit/b5a2d4c1d62c9620a68d72b7f20248c69ef7663b), [`1c18c68`](https://github.com/Effect-TS/effect/commit/1c18c688df10b697c10283160dba143e049f3d50), [`43416c4`](https://github.com/Effect-TS/effect/commit/43416c4142f973f4988440716eb54a498659cd3a), [`d6ac8f9`](https://github.com/Effect-TS/effect/commit/d6ac8f923a33ff298a87f31230735e71d2d082e9), [`1d9fb8c`](https://github.com/Effect-TS/effect/commit/1d9fb8c540a11326650baa0866a17951665189e7), [`20dcd50`](https://github.com/Effect-TS/effect/commit/20dcd5060581077b46325a433f787ba10a56963d), [`42e5750`](https://github.com/Effect-TS/effect/commit/42e5750f7e2fbf349cfe45452d7cc9dce98d6fe9), [`888e326`](https://github.com/Effect-TS/effect/commit/888e326a3180aea9b117fe7c97aace5dd527596e), [`0b52bb4`](https://github.com/Effect-TS/effect/commit/0b52bb42fac5aecb8bcb8d899293c641b62c3f66), [`e823e69`](https://github.com/Effect-TS/effect/commit/e823e693773aa163c0081af00a5236118446c6ae), [`962647b`](https://github.com/Effect-TS/effect/commit/962647b6a16000f882e6999f001c513a8cccc711), [`43fdcdc`](https://github.com/Effect-TS/effect/commit/43fdcdc6c81b6ad22d54061d6c6c45d9243d7c33), [`1f89b8e`](https://github.com/Effect-TS/effect/commit/1f89b8ec64e6362da3eaaff8cbb235df88d3441c), [`e1a521a`](https://github.com/Effect-TS/effect/commit/e1a521a6886a281abee016ff9aa57c3b172057c8)]:
+  - effect@4.0.1
+
 ## 4.0.0
 
 ### Patch Changes

diff --git a/packages/ai/anthropic/package.json b/packages/ai/anthropic/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@effect/ai-anthropic",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "type": "module",
   "license": "MIT",
   "description": "An Anthropic provider integration for Effect AI SDK",

diff --git a/packages/ai/cloudflare/CHANGELOG.md b/packages/ai/cloudflare/CHANGELOG.md
@@ -0,0 +1,9 @@
+# @effect/ai-cloudflare
+
+## 4.0.1
+
+### Patch Changes
+
+- [#8677](https://github.com/Effect-TS/effect/pull/8677) [`480bba2`](https://github.com/Effect-TS/effect/commit/480bba2dfebba5b0e58695a9837895dfb65895ee) Thanks @danieljvdm! - Add a Cloudflare Workers AI decision provider for Clef and Clef-flash.
+- Updated dependencies [[`ed2cc2f`](https://github.com/Effect-TS/effect/commit/ed2cc2f322dfd24da550c8d0ac811c3130b79d74), [`58a2ee8`](https://github.com/Effect-TS/effect/commit/58a2ee8e0db8e0a90bae83c6cceeff6916772fee), [`bc44526`](https://github.com/Effect-TS/effect/commit/bc445262eeaaba6f7f28a154023a590e193e547d), [`073bb47`](https://github.com/Effect-TS/effect/commit/073bb475d1e84e09cdcd8303a4a558f2a73d8396), [`2ec021e`](https://github.com/Effect-TS/effect/commit/2ec021eff7fbd2206adc3e8bf4e803ed4bf07d6a), [`cad1118`](https://github.com/Effect-TS/effect/commit/cad111867a666cebe8ff9bf2237a997fa6e4cb14), [`1672d9c`](https://github.com/Effect-TS/effect/commit/1672d9ca8da3e5b536bf7afb73365cccc6c01f53), [`a81e4e6`](https://github.com/Effect-TS/effect/commit/a81e4e6cb3dfbf01b1c53c1c877fddeaced8a278), [`f5c2a91`](https://github.com/Effect-TS/effect/commit/f5c2a91621401a018b770446d35ef99806c5561f), [`498e72b`](https://github.com/Effect-TS/effect/commit/498e72ba14d0191d6bf66cc0e931c229a1ff442f), [`cabf123`](https://github.com/Effect-TS/effect/commit/cabf1230723e92684a4b0b836ccfde25c657f9f1), [`a5b1d4e`](https://github.com/Effect-TS/effect/commit/a5b1d4e4cae01dbe30890d3796f846bda00ad2ae), [`878cb33`](https://github.com/Effect-TS/effect/commit/878cb33f4f5f5a31d2c80a9ddb7d62a611230e1c), [`5e6f756`](https://github.com/Effect-TS/effect/commit/5e6f7568a4c895eab3087249b191c5dcba5e73ef), [`18dfb98`](https://github.com/Effect-TS/effect/commit/18dfb98cf6d2aeedbab8ef5734f9bc273a82d56e), [`04706ef`](https://github.com/Effect-TS/effect/commit/04706eff5da94b4d475b99eab8b0256bed97b080), [`f157482`](https://github.com/Effect-TS/effect/commit/f15748273a89afff4b05d5e6bec22c567c2a3cda), [`b5a2d4c`](https://github.com/Effect-TS/effect/commit/b5a2d4c1d62c9620a68d72b7f20248c69ef7663b), [`1c18c68`](https://github.com/Effect-TS/effect/commit/1c18c688df10b697c10283160dba143e049f3d50), [`43416c4`](https://github.com/Effect-TS/effect/commit/43416c4142f973f4988440716eb54a498659cd3a), [`d6ac8f9`](https://github.com/Effect-TS/effect/commit/d6ac8f923a33ff298a87f31230735e71d2d082e9), [`1d9fb8c`](https://github.com/Effect-TS/effect/commit/1d9fb8c540a11326650baa0866a17951665189e7), [`20dcd50`](https://github.com/Effect-TS/effect/commit/20dcd5060581077b46325a433f787ba10a56963d), [`42e5750`](https://github.com/Effect-TS/effect/commit/42e5750f7e2fbf349cfe45452d7cc9dce98d6fe9), [`888e326`](https://github.com/Effect-TS/effect/commit/888e326a3180aea9b117fe7c97aace5dd527596e), [`0b52bb4`](https://github.com/Effect-TS/effect/commit/0b52bb42fac5aecb8bcb8d899293c641b62c3f66), [`e823e69`](https://github.com/Effect-TS/effect/commit/e823e693773aa163c0081af00a5236118446c6ae), [`962647b`](https://github.com/Effect-TS/effect/commit/962647b6a16000f882e6999f001c513a8cccc711), [`43fdcdc`](https://github.com/Effect-TS/effect/commit/43fdcdc6c81b6ad22d54061d6c6c45d9243d7c33), [`1f89b8e`](https://github.com/Effect-TS/effect/commit/1f89b8ec64e6362da3eaaff8cbb235df88d3441c), [`e1a521a`](https://github.com/Effect-TS/effect/commit/e1a521a6886a281abee016ff9aa57c3b172057c8)]:
+  - effect@4.0.1
diff --git a/packages/ai/cloudflare/package.json b/packages/ai/cloudflare/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@effect/ai-cloudflare",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "type": "module",
   "license": "MIT",
   "description": "A Cloudflare Workers AI decision provider for Effect",