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Consider exact version pins for MCP dependencies in .mcp.json #3307

Description

@tomelias10

The committed .mcp.json currently includes mutable package references including:

  • @upstash/context7-mcp@latest
  • @playwright/mcp@latest
  • bare @modelcontextprotocol/server-sequential-thinking

This is not a vulnerability report. It is a reproducibility/review-boundary issue: an unchanged MCP config can resolve to newer package code later. For teams that review MCP tooling before use, that makes the reviewed artifact non-deterministic.

Suggested control: pin external npm/npx MCP packages to reviewed exact versions and bump them deliberately.

I checked the config statically only; no servers were started and no packages were downloaded. Author disclosure: the passive checker used was https://github.com/tomelias10/mcp-drift-check.

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