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My Scanner Passed Until I Built a Harness That Lied to It on Purpose

Every security tool has a dirty secret: nobody tests whether the detector detects. The tests pass, the CI is green, and everyone moves on.

  • Security scanner mcpscan failed one out of seven tests designed to deceive it.
  • Harness generator evaluates scanner output, matches findings to rule ids.
  • Fix includes pre-joining string literals, normalizing lines, and flagging discrepancies.

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