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[langchan-core] Breaking change: Tool with argument tool_call_id forces <code>invoke</code> to use different call pattern

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

coreRelated to the package `langchain-core`Related to the package `langchain-core`

langchainRelated to the package `langchain`Related to the package `langchain`

Status: Open.

Bug

#34169 In langchain-ai/langchain;

· cristianocca opened on Dec 2, 2025

tool_call_id not passed to on_tool_start callback in BaseTool.run()

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

coreRelated to the package `langchain-core`Related to the package `langchain-core`

Status: Open.

Bug

#34168 In langchain-ai/langchain;

· gustavhartz opened on Dec 2, 2025

[langchain-deepseek] Missing <code>reasoning_content</code> in request payload when using deepseek-reasoner with tool calling

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

deepseek

Status: Open.

Bug

#34166 In langchain-ai/langchain;

· yefengzi7 opened on Dec 2, 2025

"End" exit behaviour in AgentMiddleware does not trigger <code>on_agent_finish</code> hook of AsyncCallbackHandler

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

coreRelated to the package `langchain-core`Related to the package `langchain-core`

langchainRelated to the package `langchain`Related to the package `langchain`

openai

Status: Open.

Bug

#34165 In langchain-ai/langchain;

· samaksh-khatri-simform opened on Dec 2, 2025

ToolCallLimitMiddleware with end behavior makes State invalid

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

langchainRelated to the package `langchain`Related to the package `langchain`

Status: Open.

Bug

#34159 In langchain-ai/langchain;

· filippopellizzari opened on Dec 1, 2025

Custom state schema passed to <code>create_agent</code> doesnt come within middleware

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

coreRelated to the package `langchain-core`Related to the package `langchain-core`

langchainRelated to the package `langchain`Related to the package `langchain`

openai

Status: Open.

Bug

#34156 In langchain-ai/langchain;

· thisisayushg opened on Dec 1, 2025

Groq <code>openai/gpt-oss-120b</code> model incompatible with structured output (<code>create_agent</code>, <code>ChatGroq.with_structured_output</code>)

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

groq

langchainRelated to the package `langchain`Related to the package `langchain`

Status: Open.

Bug

#34155 In langchain-ai/langchain;

· cosasha97 opened on Dec 1, 2025

Openai compatible models: "reasoning" block missing in AIMessageChunk, and AIMessage

feature requestrequest for an enhancement / additional functionalityrequest for an enhancement / additional functionality

langchainRelated to the package `langchain`Related to the package `langchain`

openai

Status: Open.

Feature

#34153 In langchain-ai/langchain;

· mkc-cho opened on Dec 1, 2025

ActionAgent: aplan: unsupported operand type(s) for +=: 'dict' and 'dict'

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

langchain-classic

openai

Status: Open.

Bug

#34151 In langchain-ai/langchain;

· Spikhalskiy opened on Nov 30, 2025

Implementing the tool_select_tool tool

feature requestrequest for an enhancement / additional functionalityrequest for an enhancement / additional functionality

langchainRelated to the package `langchain`Related to the package `langchain`

Status: Open.

Feature

#34147 In langchain-ai/langchain;

· arkonchen opened on Nov 30, 2025

<code>ProviderStrategy</code> does not allow passing <code>strict=True</code> into the OpenAI JSON Schema <code>response_format</code>

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

langchainRelated to the package `langchain`Related to the package `langchain`

Status: Open.

Bug

#34146 In langchain-ai/langchain;

· hjerbii opened on Nov 29, 2025

ClearToolUsesEdit add option to select specific tools instead of having to exclude tools

feature requestrequest for an enhancement / additional functionalityrequest for an enhancement / additional functionality

langchainRelated to the package `langchain`Related to the package `langchain`

Status: Open.

Feature

#34145 In langchain-ai/langchain;

· valentingoelz opened on Nov 29, 2025