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ChatOpenAI drops reasoning_content field from reasoning models (o1, grok)

Status: Open.

#34706 In langchain-ai/langchain;

· fede-kamel opened on Jan 12, 2026

AssertionError: Please remove duplicate middleware instances in create_deep_agent with TodoListMiddleware and custom system_prompt

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

Status: Open.

Bug

#34698 In langchain-ai/langchain;

· fzozyurt opened on Jan 11, 2026

Bug Report: MCP Tools Return List Instead of String, Breaking Chat Model Serialization

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

Status: Open.

Bug

#34669 In langchain-ai/langchain;

· fzozyurt opened on Jan 8, 2026

Docs: JSON schema 'title' requirement not clearly documented

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

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

Status: Open.

Bug

#34662 In langchain-ai/langchain;

· HeenaRajan opened on Jan 8, 2026

When using OpenAI Responses API in streaming mode, there is no chunk from langchain that contains the entire function_call definition including arguments.

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

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

Status: Open.

Bug

#34660 In langchain-ai/langchain;

· nidhi-nair opened on Jan 8, 2026

Error in create_agent() when enable "messages" streaming mode: 'Error: is not a valid tool'

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

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

Status: Open.

Bug

#34654 In langchain-ai/langchain;

· Smpests opened on Jan 8, 2026

astream lose when useing deep-Thinking model

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

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

Status: Open.

Bug

#34648 In langchain-ai/langchain;

· LLLzxx opened on Jan 8, 2026

Langsmith <code>include_model</code> broken due to deserialization allowlist

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

Status: Open.

Bug

#34645 In langchain-ai/langchain;

· gabrielrfg opened on Jan 8, 2026

Request for Guidance: Reasoning Transparency After Migrating from <code>ZeroShotAgent</code> to <code>create_agent</code>

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

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

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

Status: Open.

Feature

#34630 In langchain-ai/langchain;

· Yuvashrikumar opened on Jan 7, 2026

OllamaEmbeddings doesnt support <code>output_dimensionality</code> in embed_documents method.

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

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

Status: Open.

Feature

#34623 In langchain-ai/langchain;

· fathurwithyou opened on Jan 7, 2026

Issue: Deprecation warning guides users to langchain.agents, breaking stream_mode="messages" token streaming

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

groq`langchain-groq` package issues & PRs`langchain-groq` package issues & PRs

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

Status: Open.

Bug

#34613 In langchain-ai/langchain;

· AmazyanAyoub opened on Jan 6, 2026

OpenAI.BadRequestError when using create_agent with structured output and tools with optional input parameters

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

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

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

Status: Open.

Bug

#34596 In langchain-ai/langchain;

· sabri-bruc-scacap opened on Jan 4, 2026