fix(python): cap mcp dependency to <2 across all Python servers - #4577
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fix(python): cap mcp dependency to <2 across all Python servers#4577cyforkk wants to merge 1 commit into
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mcp 2.0.0 renamed McpError to MCPError, breaking imports in servers with no upper bound. Cap mcp to <2 in all three Python servers (time, fetch, git) and regenerate lockfiles with the default PyPI index. Closes modelcontextprotocol#4560, modelcontextprotocol#4570 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This was referenced Jul 29, 2026
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Capping the dependency at mcp<2 is the right emergency triage for
unblocking local builds, but it highlights the larger enterprise supply
chain vulnerability.
Unpinned launcher resolutions taking down production endpoints is an
automatic red flag during enterprise vendor onboarding. Corporate clients
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clear migration path to the v2 spec.
We help dev teams resolve both the technical v2 migration and the CISO
compliance checks with our fixed-scope £395 MCP Readiness Audit:
*mcp.ecocitizenz.com
<http://mcp.ecocitizenz.com>*
…On Wed, Jul 29, 2026 at 1:50 PM cyforkk ***@***.***> wrote:
Description
Closes #4560 <#4560>,
#4570 <#4570>
The mcp SDK 2.0.0 renamed McpError to MCPError, breaking imports in
servers that had no upper bound on the mcp dependency. All unpinned
launchers (like uvx) resolved to 2.0.0 and failed at startup.
This PR caps the mcp dependency to <2 in all three Python servers:
- mcp-server-time: mcp>=1.23.0 → mcp>=1.23.0,<2
- mcp-server-fetch: mcp>=1.1.3 → mcp>=1.1.3,<2
- mcp-server-git: mcp>=1.0.0 → mcp>=1.0.0,<2
Lockfiles are regenerated with the default PyPI index to ensure CI
compatibility.
Changes
- src/time/pyproject.toml + src/time/uv.lock
- src/fetch/pyproject.toml + src/fetch/uv.lock
- src/git/pyproject.toml + src/git/uv.lock
Checklist
- PR title follows conventional commits
- Linked issues #4560
<#4560>, #4570
<#4570>
- Lockfiles regenerated with correct index
- Change is minimal and scoped
Co-Authored-By: Claude Fable 5 ***@***.***
------------------------------
You can view, comment on, or merge this pull request online at:
#4577
Commit Summary
- 4369d8c
<4369d8c>
fix(python): cap mcp dependency to <2 across all Python servers
File Changes
(6 files <https://github.com/modelcontextprotocol/servers/pull/4577/files>
)
- *M* src/fetch/pyproject.toml
<https://github.com/modelcontextprotocol/servers/pull/4577/files#diff-9ebddfcba7203950888834d646ce9cf07f061d6b2d7cc5c1964195da56b3ee1a>
(2)
- *M* src/fetch/uv.lock
<https://github.com/modelcontextprotocol/servers/pull/4577/files#diff-bd9bb40e7418b433b93cfa67471628876f3e75e1bfa7091a4a2487423a92fbdf>
(2)
- *M* src/git/pyproject.toml
<https://github.com/modelcontextprotocol/servers/pull/4577/files#diff-0258d4dd5dd89355c4fe5354fd894ef24ef2f494ad6962f69333008ad21bbbfb>
(2)
- *M* src/git/uv.lock
<https://github.com/modelcontextprotocol/servers/pull/4577/files#diff-3b2540c336df9745f92f5cd0eb5deb216ddc62016ff3454fbe967c39a0c5ab9e>
(2)
- *M* src/time/pyproject.toml
<https://github.com/modelcontextprotocol/servers/pull/4577/files#diff-6463bc847e7a4a1c35b85e14579034edeb1e232a77bfc02c0f41cc158e25e083>
(2)
- *M* src/time/uv.lock
<https://github.com/modelcontextprotocol/servers/pull/4577/files#diff-709add7eda7fc1270eba3d9548a17514844b3d7f3c8509e1aa41e92da80d5a22>
(2)
Patch Links:
- https://github.com/modelcontextprotocol/servers/pull/4577.patch
- https://github.com/modelcontextprotocol/servers/pull/4577.diff
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Description
Closes #4560, #4570
The
mcpSDK 2.0.0 renamedMcpErrortoMCPError, breaking imports in servers that had no upper bound on themcpdependency. All unpinned launchers (likeuvx) resolved to 2.0.0 and failed at startup.This PR caps the
mcpdependency to<2in all three Python servers:mcp-server-time:mcp>=1.23.0→mcp>=1.23.0,<2mcp-server-fetch:mcp>=1.1.3→mcp>=1.1.3,<2mcp-server-git:mcp>=1.0.0→mcp>=1.0.0,<2Lockfiles are regenerated with the default PyPI index to ensure CI compatibility.
Changes
src/time/pyproject.toml+src/time/uv.locksrc/fetch/pyproject.toml+src/fetch/uv.locksrc/git/pyproject.toml+src/git/uv.lockChecklist
Co-Authored-By: Claude Fable 5 noreply@anthropic.com