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My MCP Tool's Empty-Payload Guard Checks Whether You Passed a Field. It Never Checked Whether the Field Would Actually Change Anything.
Back in early August I fixed a bug in update_article , one of the tools in this repo's DEV.to MCP server. The bug was straightforward: the tool built its PUT payload from three optional parameters, and if a caller passed none of them, it still fired a GET and a PUT with an empty {"article": {}} body against a live published post, then logged a no-op entry to the audit trail as if something had happened. The fix was a guard: raise before either network call if the built payload dict ends up em...
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