Developer Discovers Two Core API Helpers in MCP Server Had No Error Handling

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A developer building an MCP server recently found that two critical API helper functions, one for GitHub and one for DEV.to, contained no try-except error handling whatsoever. The gap meant that any failed API call — whether a 404, 401, 422, or 429 — would propagate a raw Python traceback directly to the MCP client instead of a readable error message. Seven of the server's eight tools relied on these unprotected functions for nearly every invocation. The issue went unnoticed because both helpers worked correctly under normal conditions, masking the underlying vulnerability. The developer had previously hardened a separate function through three iterative fixes, and only discovered the blind spot while auditing whether that safer pattern had been applied elsewhere in the codebase.

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