Pin langchain-mcp-adapters and mcp versions - #25
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aviweit merged 2 commits intoJul 30, 2026
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mcp 2.0.0 removed RequestContext from mcp.shared.context which langchain-mcp-adapters 0.3.1 still imports, causing an ImportError that surfaces as HTTP 500 from the skillberry proxy agent. Capping at 0.3.0 keeps the dependency on the mcp 1.x-compatible adapter release.
mcp 2.0.0 removed RequestContext from mcp.shared.context. langchain-mcp-adapters <=0.3.0 still imports it at module load time, causing an ImportError on every request. Explicitly cap mcp to <2.0.0.
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Fix: Pin langchain-mcp-adapters and mcp versions
Why This PR Was Needed
Breaking Change in mcp 2.0.0: MCP 2.0.0 removed
RequestContextfrommcp.shared.context, which is still imported bylangchain-mcp-adaptersversions ≤0.3.0 at module load time. This causes anImportErroron every request.The Issue:
langchain-mcp-adapters0.3.1+ still imports the removedRequestContextThe Solution:
>= 1.9.2, < 2.0.0— Keeps the dependency on the mcp 1.x series which still exportsRequestContext>= 0.2.1, <= 0.3.0— Ensures we use adapter versions compatible with mcp 1.xThis maintains stability until
langchain-mcp-adaptersreleases a version compatible with mcp 2.0.0+.Description
This PR pins version constraints for
langchain-mcp-adaptersandmcpdependencies to prevent compatibility issues.mcpdependency with upper bound constraint< 2.0.0<= 0.3.0tolangchain-mcp-adaptersto prevent breaking changes in future releases