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Agent Server: cancelling a run with a subagent in flight crashes the JS sidecar — the abort rejects a subagent handle nothing is left to await

Status: Open.

#2873 In langchain-ai/langgraphjs;

· Alejandro Esteban Salazar (The-Best-Joke) opened on Sep 22, 2026

fix(sdk): block-delta events overwrite tool_call_chunk args instead of accumulating them

Status: Open.

#2866 In langchain-ai/langgraphjs;

· Leo Camus (Dev-next-gen) opened on Sep 22, 2026

sdk: a nested messagesProjection applies child namespace values events and rebuilds the parent's store

Status: Open.

#2859 In langchain-ai/langgraphjs;

· Harry Yep (okisdev) opened on Sep 21, 2026

SDK: isThreadLoading stays true when hydrate() and submit() overlap for the same thread

Status: Open.

#2845 In langchain-ai/langgraphjs;

· Rahul Raj Purohit (rrajpuro) opened on Sep 16, 2026

SDK v2: hydrated interrupt stays pending after another client resumes the thread

Status: Open.

#2842 In langchain-ai/langgraphjs;

· Rahul Raj Purohit (rrajpuro) opened on Sep 16, 2026

[langgraph-checkpoint-mongodb] npm mongodb dependency version frozen to ^6.21

Status: Open.

#2840 In langchain-ai/langgraphjs;

· Jérôme HENAFF (paztis) opened on Sep 15, 2026

Checkpointer write rejections fire as process-level unhandledRejection even on fully awaited runs (durability: "async")

Status: Open.

#2838 In langchain-ai/langgraphjs;

· SipgateSteffenPaul opened on Sep 14, 2026

SDK v2: hydration treats an active run's empty next checkpoint as idle and never subscribes

Status: Open.

#2804 In langchain-ai/langgraphjs;

· Simon Vollmer (simon-lighthouse) opened on Sep 8, 2026

[SDK] applyCoreContentDelta appends tool_call_chunk args while applyCoreEventDelta's block-delta overwrites them

Status: Open.

#2766 In langchain-ai/langgraphjs;

· darkobardic opened on Aug 31, 2026

CustomAdapterOptions types defaultHeaders/client as never, but the client base built by useStream reads them — self-hosted custom-transport servers get unauthenticated getHistory → 401

Status: Open.

#2754 In langchain-ai/langgraphjs;

· duohelingdukele opened on Aug 27, 2026

CI: tracing.test.ts 'does not double stream tokens' fails on Node 26.8.x — all PR unit-test jobs red since runners moved off 26.7.0

Status: Open.

#2752 In langchain-ai/langgraphjs;

· t3s7r opened on Aug 27, 2026

updateState on the root checkpoint merges DeltaChannel writes from parallel branches

Status: Open.

#2737 In langchain-ai/langgraphjs;

· Jason Pickens (steinybot) opened on Aug 23, 2026