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Pin mcp below v2 to fix pip resolution and avoid a breaking-API bump #2216

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Merged
JSv4 merged 1 commit into from
Aug 1, 2026
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Pin mcp below v2 to fix pip resolution and avoid a breaking-API bump #2216

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13 changes: 13 additions & 0 deletions changelog.d/2207-pin-mcp-below-v2.fixed.md
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Original file line number Diff line number Diff line change
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- `requirements/base.txt:85` — pinned `mcp` to `>=1.28.1,<2` (was unbounded).
Dependabot's `mcp>=2.0.0` bump (#2207) hit `pip`'s resolver as
`resolution-too-deep`: `pydantic-ai-slim[mcp]`'s `fastmcp-slim` dependency
caps `mcp<2.0` across its entire published range, so the unbounded pin was
resolving to 1.x only by transitive accident. `mcp` 2.0 is also a breaking
rewrite — `mcp.server.lowlevel.Server` drops decorator-based handler
registration (`@mcp_server.list_resources()` etc.) in favor of `on_*=`
constructor kwargs with a new `(ctx, params)` handler signature — which
`opencontractserver/mcp/server.py` does not yet speak (10 registration
sites across `create_mcp_server()` and `create_scoped_mcp_server()`), so
forcing the bump would fail at ASGI import time, not just in CI. PR #2207
is left open/unmerged; revisit the `mcp` 2.x migration as its own scoped
task once `fastmcp-slim` ships v2 support.
9 changes: 8 additions & 1 deletion requirements/base.txt
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Expand Up @@ -82,7 +82,14 @@ posthog==7.33.0 # https://github.com/posthog/posthog-python

# Model Context Protocol
# ------------------------------------------------------------------------------
mcp>=1.28.1 # https://github.com/anthropics/python-sdk
mcp>=1.28.1,<2 # https://github.com/modelcontextprotocol/python-sdk
# ^ pydantic-ai-slim[mcp] -> fastmcp-slim caps mcp<2.0 across its whole
# published range as of 2026-08; mcp 2.0 is a breaking rewrite (decorator-based
# handler registration on mcp.server.lowlevel.Server removed in favor of
# on_*= constructor kwargs) that opencontractserver/mcp/server.py does not yet
# speak. Bump this pin only alongside a migration of that file, once
# fastmcp-slim ships v2 support (or fastmcp-slim/mcp is dropped in favor of
# calling the v2 API directly).

# Not directly required, pinned by Snyk to avoid a vulnerability
# ------------------------------------------------------------------------------
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