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count_tokens_approximately: missing handler for tool_use content blocks causes ~2.4x overcounting

external

Status: Open.

#35558 In langchain-ai/langchain;

· Fabian Biebl (fbiebl) opened on Mar 4, 2026

Review, improvement, and migration of SemanticChunker to a non-experimental langchain pachage

external

feature requestRequest for an enhancement / additional functionalityRequest for an enhancement / additional functionality

text-splittersRelated to the package `text-splitters`Related to the package `text-splitters`

Status: Open.

Feature

#35553 In langchain-ai/langchain;

· Rodrigo Brocchi (brocchirodrigo) opened on Mar 4, 2026

Inconsistent multimodal image format: JS camelCase vs Python snake_case

external

Status: Open.

#35548 In langchain-ai/langchain;

· huyiZhang (huge0612) opened on Mar 4, 2026

Args with default_factory in a tool's args_schema should not be required

core`langchain-core` package issues & PRs`langchain-core` package issues & PRs

external

feature requestRequest for an enhancement / additional functionalityRequest for an enhancement / additional functionality

langchain`langchain` package issues & PRs`langchain` package issues & PRs

Status: Open.

Feature

#35547 In langchain-ai/langchain;

· Wang Liao (liaowang11) opened on Mar 4, 2026

LangChain v1.1-1.12 create_agent with response_format hardcodes tool_choice="any" for structured output tool, breaking Anthropic thinking + structured output.

anthropic`langchain-anthropic` package issues & PRs`langchain-anthropic` package issues & PRs

bugRelated to a bug, vulnerability, unexpected error with an existing featureRelated to a bug, vulnerability, unexpected error with an existing feature

external

langchain`langchain` package issues & PRs`langchain` package issues & PRs

Status: Open.

Bug

#35539 In langchain-ai/langchain;

· stoyan-atanasov-beye opened on Mar 3, 2026

PydanticSerializationUnexpectedValue warning when using structured output

bugRelated to a bug, vulnerability, unexpected error with an existing featureRelated to a bug, vulnerability, unexpected error with an existing feature

external

langchain`langchain` package issues & PRs`langchain` package issues & PRs

openai`langchain-openai` package issues & PRs`langchain-openai` package issues & PRs

Status: Open.

Bug

#35538 In langchain-ai/langchain;

· John Ayoub (johnayoub-wtw) opened on Mar 3, 2026

AzureChatOpenAI initialization is not backwards compatible - forcing User-Agent header override

external

Status: Open.

#35521 In langchain-ai/langchain;

· Liraz Aharoni (appliraz) opened on Mar 2, 2026

Add Capsule to safely run untrusted code using WebAssembly sandboxes

external

feature requestRequest for an enhancement / additional functionalityRequest for an enhancement / additional functionality

langchain`langchain` package issues & PRs`langchain` package issues & PRs

Status: Open.

Feature

#35518 In langchain-ai/langchain;

· Mohamed Diallo (mavdol) opened on Mar 2, 2026

Streaming tool call executed with empty args {} due to SSE fragmentation of tool call arguments

bugRelated to a bug, vulnerability, unexpected error with an existing featureRelated to a bug, vulnerability, unexpected error with an existing feature

core`langchain-core` package issues & PRs`langchain-core` package issues & PRs

external

openai`langchain-openai` package issues & PRs`langchain-openai` package issues & PRs

Status: Open.

Bug

#35514 In langchain-ai/langchain;

· backer-and opened on Mar 2, 2026

ChatAnthropic in streaming output scenarios, usage input_tokens is always 0

anthropic`langchain-anthropic` package issues & PRs`langchain-anthropic` package issues & PRs

bugRelated to a bug, vulnerability, unexpected error with an existing featureRelated to a bug, vulnerability, unexpected error with an existing feature

external

Status: Open.

Bug

#35509 In langchain-ai/langchain;

· deku0818 opened on Mar 2, 2026

Nested subgraph rendering fails for 3+ levels with <code>draw_mermaid</code> and <code>xray=True</code>

bugRelated to a bug, vulnerability, unexpected error with an existing featureRelated to a bug, vulnerability, unexpected error with an existing feature

core`langchain-core` package issues & PRs`langchain-core` package issues & PRs

external

Status: Open.

Bug

#35492 In langchain-ai/langchain;

· Taehan (Hank) Kim (taehan79-kim) opened on Mar 1, 2026

RunnableRetry.batch/abatch can return corrupted outputs when some items succeed on retry and others still fail

bugRelated to a bug, vulnerability, unexpected error with an existing featureRelated to a bug, vulnerability, unexpected error with an existing feature

core`langchain-core` package issues & PRs`langchain-core` package issues & PRs

external

Status: Open.

Bug

#35475 In langchain-ai/langchain;

· yangbaechu opened on Feb 28, 2026