Testing an MCP Tool Server Without a Working mcp Package Import

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A developer whose MCP server file imports the mcp package at module scope found that the import failed in their publishing pipeline sandbox, even though pip reported the package as installed. Because the import blocked the whole file, including a 60-assertion self-test, they placed a minimal stub package on PYTHONPATH whose decorator returns functions unmodified. Running the self-test this way let 51 of the 60 assertions pass, covering duplicate-title checks, confirm gating, staleness detection, and credential-leak prevention. The remaining assertions failed because the stub lacked the SDK's argument validation, which the developer says is needed to catch a real bug involving a nullable string parameter.

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