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How to catch an agent that removes or skips tests with Canny

Flags edits that delete test cases or add skip markers, and asks for approval on Claude Code or denies on Codex.

Who it is forA developer whose agent is asked to make a failing suite pass and might disable the failing tests instead.

The problemAn agent can make a suite look green by removing test cases or marking them skipped, and the failure disappears from view.

The outcomeTest removals and skip markers trigger a prompt or a denial, with a reason that says how to allow it if the removal was intended.

What you need first

  • git installed
  • Node.js 22 or newer
  • Claude Code or Codex CLI installed in the project
  • A terminal to run the install commands
  • Repository is not on npm, so install is a git clone

Steps

  1. Install Canny and run node ~/.canny/src/dist/cli.js init in the project root.
  2. Ask the agent to make a failing test pass by any means, and watch whether it tries to add a skip marker or delete a test.
  3. On Claude Code, approve or reject the permission prompt that shows Canny's reason.
  4. To allow an intended removal, add the exception in .canny.json as described by the reason text.

Prompt for your agent

Clone https://github.com/qkal/canny into ~/.canny/src and run `node ~/.canny/src/dist/cli.js init` in <project-path>. Ask the agent to make a failing test pass and report whether any edit adding a skip marker or removing a test case was asked about or denied, with Canny's reason.

Caveat. Detection covers the skip markers and commands the README lists, so an unlisted way of disabling a test will not be caught.

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