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ResourceLink, EmbeddedResource Metadata Loss During MCP to LangChain Conversion

Status: Open.

#606 In langchain-ai/langchain-mcp-adapters;

· Athvaith2828 opened on Aug 12, 2026

[BUG] Duplicate tool names are silently overwritten across MCP servers

Status: Open.

#605 In langchain-ai/langchain-mcp-adapters;

· HackHuang (GoogTech) opened on Aug 11, 2026

tool() got an unexpected keyword argument 'handle_tool_error'

Status: Open.

#598 In langchain-ai/langchain-mcp-adapters;

· karani Abdellah (KaraniAbdellah) opened on Aug 3, 2026

Calling _convert_mcp_content_to_lc_block with a ResourceLink conflicts with langchain-aws _messages_to_bedrock (and possibly others)

Status: Open.

#591 In langchain-ai/langchain-mcp-adapters;

· samuelcm-bflexion opened on Jul 30, 2026

Question: does the adapter preserve extra/unknown fields on a tool response?

Status: Open.

#581 In langchain-ai/langchain-mcp-adapters;

· Tal Mogendorff (Lulu-The-Narwhal) opened on Jul 23, 2026

Support for upcoming Python MCP SDK v2.0.0

Status: Open.

#578 In langchain-ai/langchain-mcp-adapters;

· Dan Leehr (dleehr) opened on Jul 21, 2026

StructuredTool does not support sync invocation when using MCP tools with create_react_agent

Status: Open.

#576 In langchain-ai/langchain-mcp-adapters;

· hyx1249207016-netizen opened on Jul 18, 2026

MCPToolCallResult is rejected as a type expression by strict type checkers

Status: Open.

#564 In langchain-ai/langchain-mcp-adapters;

· Ricardo (ricayanzon) opened on Jul 3, 2026

[Bug] Resource Leak (FD/Zombie Processes) in MultiServerMCPClient.get_tools during concurrent task failures

Status: Open.

#551 In langchain-ai/langchain-mcp-adapters;

· Qiu Yucheng (QiuYucheng2003) opened on Jun 23, 2026

MCP tools with a parameter named "config" silently broken by LangChain's RunnableConfig injection

Status: Open.

#532 In langchain-ai/langchain-mcp-adapters;

· Apoorv Garg (apoorv-garg) opened on May 30, 2026

Misleading "api_key not set" error when connection config is malformed

Status: Open.

#526 In langchain-ai/langchain-mcp-adapters;

· BlendTreeD opened on May 27, 2026

StructuredTool._run() raises NotImplementedError when only coroutine is available, instead of falling back to async execution

Status: Open.

#524 In langchain-ai/langchain-mcp-adapters;

· yxb945 (lsf1001) opened on May 27, 2026