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Blob.as_bytes_io() raises NotImplementedError for string data

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

#36667 In langchain-ai/langchain;

· chang923 opened on Apr 11, 2026

Support OpenAI token count API

external

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

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

Status: Open.

Feature

#36661 In langchain-ai/langchain;

· Tharshan Muthulingam (viperfx) opened on Apr 10, 2026

bug(openai): _create_usage_metadata crashes with TypeError when service_tier is set and cached_tokens is missing

external

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

Status: Open.

#36657 In langchain-ai/langchain;

· Yunsu (Hybirdss) opened on Apr 10, 2026

bug(core): _batch and _abatch lack batch_size validation causing infinite loop

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

#36647 In langchain-ai/langchain;

· chang923 opened on Apr 10, 2026

bug(core): same-index tool_call chunks in one streamed delta can split into blank tool_calls and invalid_tool_calls

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

external

Status: Open.

#36627 In langchain-ai/langchain;

· Yuchen Lin (lyc280705) opened on Apr 9, 2026

feat(middleware): TodoListMiddleware should re-inject current todos into system prompt for deep/long-running agent compatibility

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

#36624 In langchain-ai/langchain;

· Chetan Reddy (chetanreddyv) opened on Apr 9, 2026

MongoDB Toolkit fails with Firestore MongoDB-compatible endpoint due to unsupported authorizedCollections option

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

#36609 In langchain-ai/langchain;

· deepa-invisibl opened on Apr 8, 2026

PydanticSerializationUnexpectedValue warning when using structured output for AzureChatOpenAI

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

external

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

Status: Open.

Bug

#36606 In langchain-ai/langchain;

· Natallia-Spichekova-vertex opened on Apr 8, 2026

Doesn't honour pydantic model field datatype and randomly throws langchain_core.exceptions.OutputParserException

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

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

Status: Open.

Bug

#36603 In langchain-ai/langchain;

· Teh Kok How (khteh) opened on Apr 8, 2026

ollama._types.ResponseError: Internal Server Error (ref: 3f380fc3-f1b8-4b9e-aa2c-5c4486b28c08) (status code: 500)

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

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

ollama`langchain-ollama` package issues & PRs`langchain-ollama` package issues & PRs

Status: Open.

Bug

#36602 In langchain-ai/langchain;

· Teh Kok How (khteh) opened on Apr 8, 2026

bug(anthropic): ChatAnthropic sends assistant prefill for models that don't support it

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

internal

Status: Open.

#36597 In langchain-ai/langchain;

· Caspar Broekhuizen (casparb) opened on Apr 7, 2026

Support Direct Conversation/Message Interaction for Subagents (Similar to OpenClaw’s Sub-Agent Session Feature)

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

#36583 In langchain-ai/langchain;

· lsc13020528317 opened on Apr 7, 2026