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This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## @langchain/langgraph-supervisor@1.1.0 ### Minor Changes - [#2521](https://github.com/langchain-ai/langgraphjs/pull/2521) [`56682a6`](https://github.com/langchain-ai/langgraphjs/commit/56682a69a24d0dfb210f1fb5187c51e3adc356bf) Thanks [@open-swe](https://github.com/apps/open-swe)! - feat(langgraph-supervisor): Add `addHandoffMessages` to `createSupervisor` and `createHandoffTool`, allowing supervisor-to-agent handoff bookkeeping messages to be omitted from the expert agent's message history. When `addHandoffBackMessages` is not provided, it now defaults to the same value as `addHandoffMessages`, matching the Python package behavior. `createHandoffTool` now also accepts `description` as the preferred option name while continuing to support the existing `agentDescription` option as deprecated for backwards compatibility. ### Patch Changes - [#2407](https://github.com/langchain-ai/langgraphjs/pull/2407) [`59d4765`](https://github.com/langchain-ai/langgraphjs/commit/59d4765870bc0cddf3ef594b128ab3280533cb6c) Thanks [@pragnyanramtha](https://github.com/pragnyanramtha)! - Normalize all whitespace in supervisor handoff tool names. ## @langchain/langgraph@1.4.1 ### Patch Changes - [#2520](https://github.com/langchain-ai/langgraphjs/pull/2520) [`2da5c33`](https://github.com/langchain-ai/langgraphjs/commit/2da5c3374f7b91ba0afa607c507e2ff1591baca7) Thanks [@christian-bromann](https://github.com/christian-bromann)! - fix(state): validate Zod state updates from nodes Validate node return values and Command updates against Zod state schema constraints before applying them to graph state. Fixes [#2519](https://github.com/langchain-ai/langgraphjs/issues/2519) - [#2511](https://github.com/langchain-ai/langgraphjs/pull/2511) [`ef04db3`](https://github.com/langchain-ai/langgraphjs/commit/ef04db316d680ab32b812c88cadda75638294dd3) Thanks [@christian-bromann](https://github.com/christian-bromann)! - feat(ToolNode): forward graph state to tools via `runtime.state` `ToolNode` now forwards its input to each tool through the second argument as `runtime.state`. When using `ToolNode` as a node in a LangGraph graph, this gives tools access to the current graph state for workflows that need tool-call support in LangGraph proper. Tools can type the second parameter as `ToolRuntime<StateType>` from `@langchain/core/tools` and read `runtime.state` directly. This works in every runtime, including web browsers, and removes the need for `getCurrentTaskInput()` (which relies on `node:async_hooks`/`AsyncLocalStorage`). `getCurrentTaskInput(config)` continues to work for backwards compatibility. - Updated dependencies \[[`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e), [`7c3e9e9`](https://github.com/langchain-ai/langgraphjs/commit/7c3e9e93f3c7ec1dc654dac8ee8c03562ee8337b), [`17c44a3`](https://github.com/langchain-ai/langgraphjs/commit/17c44a38b7478e2bc4fe908a54c78ef33fb68ba3)]: - @langchain/langgraph-sdk@1.9.21 ## @langchain/langgraph-sdk@1.9.21 ### Patch Changes - [#2522](https://github.com/langchain-ai/langgraphjs/pull/2522) [`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e) Thanks [@christian-bromann](https://github.com/christian-bromann)! - feat(stream): add per-event side-effect selector Add `useChannelEffect` (React/Svelte/Vue) / `injectChannelEffect` (Angular), a side-effect counterpart to `useChannel` that invokes an `onEvent` callback once per raw protocol event without re-rendering. This is the idiomatic v1 replacement for the old `onLangChainEvent` / `onCustomEvent` callbacks for analytics and logging. Backed by a new framework-agnostic `acquireChannelEffect` helper in `@langchain/langgraph-sdk/stream` that shares a ref-counted subscription with matching `useChannel` consumers. - [#2523](https://github.com/langchain-ai/langgraphjs/pull/2523) [`7c3e9e9`](https://github.com/langchain-ai/langgraphjs/commit/7c3e9e93f3c7ec1dc654dac8ee8c03562ee8337b) Thanks [@christian-bromann](https://github.com/christian-bromann)! - fix(sdk): stop re-streaming seeded messages on idle-thread submit An idle (finished) thread defers its root SSE pump, so the first `submit()` brings it up and the transport replays the finished run from `seq=0`. The replayed `messages` channel carries no step (unlike `values`, guarded by `maxStep`), so it rebuilt each already-complete message from an empty `message-start` and re-streamed the whole turn token-by-token — a visible "messages replay" of the existing conversation. Seal the message ids seeded from the idle `getState()` snapshot so replayed deltas can't downgrade the complete tail; the seal lifts once a newer checkpoint advances the timeline or on thread rebind, and ids from the next run are never sealed. - [#2462](https://github.com/langchain-ai/langgraphjs/pull/2462) [`17c44a3`](https://github.com/langchain-ai/langgraphjs/commit/17c44a38b7478e2bc4fe908a54c78ef33fb68ba3) Thanks [@christian-bromann](https://github.com/christian-bromann)! - fix(sdk): reconnect v2 SSE and WebSocket thread streams after disconnect Add automatic reconnect with resume (`since` for SSE) for protocol transports, wire `AsyncCaller` through `client.threads.stream`, and expose optional reconnect tuning on `ThreadStreamOptions`. Includes integration tests against an in-process mock langgraph-api server. ## @langchain/angular@1.0.22 ### Patch Changes - [#2522](https://github.com/langchain-ai/langgraphjs/pull/2522) [`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e) Thanks [@christian-bromann](https://github.com/christian-bromann)! - feat(stream): add per-event side-effect selector Add `useChannelEffect` (React/Svelte/Vue) / `injectChannelEffect` (Angular), a side-effect counterpart to `useChannel` that invokes an `onEvent` callback once per raw protocol event without re-rendering. This is the idiomatic v1 replacement for the old `onLangChainEvent` / `onCustomEvent` callbacks for analytics and logging. Backed by a new framework-agnostic `acquireChannelEffect` helper in `@langchain/langgraph-sdk/stream` that shares a ref-counted subscription with matching `useChannel` consumers. - Updated dependencies \[[`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e), [`7c3e9e9`](https://github.com/langchain-ai/langgraphjs/commit/7c3e9e93f3c7ec1dc654dac8ee8c03562ee8337b), [`17c44a3`](https://github.com/langchain-ai/langgraphjs/commit/17c44a38b7478e2bc4fe908a54c78ef33fb68ba3)]: - @langchain/langgraph-sdk@1.9.21 ## @langchain/react@1.0.22 ### Patch Changes - [#2522](https://github.com/langchain-ai/langgraphjs/pull/2522) [`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e) Thanks [@christian-bromann](https://github.com/christian-bromann)! - feat(stream): add per-event side-effect selector Add `useChannelEffect` (React/Svelte/Vue) / `injectChannelEffect` (Angular), a side-effect counterpart to `useChannel` that invokes an `onEvent` callback once per raw protocol event without re-rendering. This is the idiomatic v1 replacement for the old `onLangChainEvent` / `onCustomEvent` callbacks for analytics and logging. Backed by a new framework-agnostic `acquireChannelEffect` helper in `@langchain/langgraph-sdk/stream` that shares a ref-counted subscription with matching `useChannel` consumers. - Updated dependencies \[[`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e), [`7c3e9e9`](https://github.com/langchain-ai/langgraphjs/commit/7c3e9e93f3c7ec1dc654dac8ee8c03562ee8337b), [`17c44a3`](https://github.com/langchain-ai/langgraphjs/commit/17c44a38b7478e2bc4fe908a54c78ef33fb68ba3)]: - @langchain/langgraph-sdk@1.9.21 ## @langchain/svelte@1.0.22 ### Patch Changes - [#2522](https://github.com/langchain-ai/langgraphjs/pull/2522) [`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e) Thanks [@christian-bromann](https://github.com/christian-bromann)! - feat(stream): add per-event side-effect selector Add `useChannelEffect` (React/Svelte/Vue) / `injectChannelEffect` (Angular), a side-effect counterpart to `useChannel` that invokes an `onEvent` callback once per raw protocol event without re-rendering. This is the idiomatic v1 replacement for the old `onLangChainEvent` / `onCustomEvent` callbacks for analytics and logging. Backed by a new framework-agnostic `acquireChannelEffect` helper in `@langchain/langgraph-sdk/stream` that shares a ref-counted subscription with matching `useChannel` consumers. - Updated dependencies \[[`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e), [`7c3e9e9`](https://github.com/langchain-ai/langgraphjs/commit/7c3e9e93f3c7ec1dc654dac8ee8c03562ee8337b), [`17c44a3`](https://github.com/langchain-ai/langgraphjs/commit/17c44a38b7478e2bc4fe908a54c78ef33fb68ba3)]: - @langchain/langgraph-sdk@1.9.21 ## @langchain/vue@1.0.22 ### Patch Changes - [#2522](https://github.com/langchain-ai/langgraphjs/pull/2522) [`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e) Thanks [@christian-bromann](https://github.com/christian-bromann)! - feat(stream): add per-event side-effect selector Add `useChannelEffect` (React/Svelte/Vue) / `injectChannelEffect` (Angular), a side-effect counterpart to `useChannel` that invokes an `onEvent` callback once per raw protocol event without re-rendering. This is the idiomatic v1 replacement for the old `onLangChainEvent` / `onCustomEvent` callbacks for analytics and logging. Backed by a new framework-agnostic `acquireChannelEffect` helper in `@langchain/langgraph-sdk/stream` that shares a ref-counted subscription with matching `useChannel` consumers. - Updated dependencies \[[`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e), [`7c3e9e9`](https://github.com/langchain-ai/langgraphjs/commit/7c3e9e93f3c7ec1dc654dac8ee8c03562ee8337b), [`17c44a3`](https://github.com/langchain-ai/langgraphjs/commit/17c44a38b7478e2bc4fe908a54c78ef33fb68ba3)]: - @langchain/langgraph-sdk@1.9.21 ## @example/ai-elements@0.1.37 ### Patch Changes - Updated dependencies \[[`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e), [`2da5c33`](https://github.com/langchain-ai/langgraphjs/commit/2da5c3374f7b91ba0afa607c507e2ff1591baca7), [`ef04db3`](https://github.com/langchain-ai/langgraphjs/commit/ef04db316d680ab32b812c88cadda75638294dd3)]: - @langchain/react@1.0.22 - @langchain/langgraph@1.4.1 ## @examples/assistant-ui-claude@0.1.37 ### Patch Changes - Updated dependencies \[[`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e), [`2da5c33`](https://github.com/langchain-ai/langgraphjs/commit/2da5c3374f7b91ba0afa607c507e2ff1591baca7), [`ef04db3`](https://github.com/langchain-ai/langgraphjs/commit/ef04db316d680ab32b812c88cadda75638294dd3)]: - @langchain/react@1.0.22 - @langchain/langgraph@1.4.1 ## @examples/ui-angular@0.0.47 ### Patch Changes - Updated dependencies \[[`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e), [`7c3e9e9`](https://github.com/langchain-ai/langgraphjs/commit/7c3e9e93f3c7ec1dc654dac8ee8c03562ee8337b), [`2da5c33`](https://github.com/langchain-ai/langgraphjs/commit/2da5c3374f7b91ba0afa607c507e2ff1591baca7), [`ef04db3`](https://github.com/langchain-ai/langgraphjs/commit/ef04db316d680ab32b812c88cadda75638294dd3), [`17c44a3`](https://github.com/langchain-ai/langgraphjs/commit/17c44a38b7478e2bc4fe908a54c78ef33fb68ba3)]: - @langchain/langgraph-sdk@1.9.21 - @langchain/angular@1.0.22 - @langchain/langgraph@1.4.1 ## @examples/ui-multimodal@0.0.23 ### Patch Changes - Updated dependencies \[[`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e), [`2da5c33`](https://github.com/langchain-ai/langgraphjs/commit/2da5c3374f7b91ba0afa607c507e2ff1591baca7), [`ef04db3`](https://github.com/langchain-ai/langgraphjs/commit/ef04db316d680ab32b812c88cadda75638294dd3)]: - @langchain/react@1.0.22 - @langchain/langgraph@1.4.1 ## @examples/ui-react@0.0.23 ### Patch Changes - Updated dependencies \[[`3855985`](https://github.com/langchain-ai/langgraphjs/commit/3855985dd049739f145295d236ce6aa02ae2fb0e), [`7c3e9e9`](https://github.com/langchain-ai/langgraphjs/commit/7c3e9e93f3c7ec1dc654dac8ee8c03562ee8337b), [`2da5c33`](https://github.com/langchain-ai/langgraphjs/commit/2da5c3374f7b91ba0afa607c507e2ff1591baca7), [`ef04db3`](https://github.com/langchain-ai/langgraphjs/commit/ef04db316d680ab32b812c88cadda75638294dd3), [`17c44a3`](https://github.com/langchain-ai/langgraphjs/commit/17c44a38b7478e2bc4fe908a54c78ef33fb68ba3)]: - @langchain/langgraph-sdk@1.9.21 - @langchain/react@1.0.22 - @langchain/langgraph@1.4.1 ## langgraph@1.0.41 ### Patch Changes - Updated dependencies \[[`2da5c33`](https://github.com/langchain-ai/langgraphjs/commit/2da5c3374f7b91ba0afa607c507e2ff1591baca7), [`ef04db3`](https://github.com/langchain-ai/langgraphjs/commit/ef04db316d680ab32b812c88cadda75638294dd3)]: - @langchain/langgraph@1.4.1 Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>