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Npx passproof install: agent can't say tests passed unless the runner printed

Passproof, a new open-source tool released under the MIT license, blocks AI coding agents from claiming tests passed unless the test runner's output appears in the same chat turn. The tool, installable via `npx passproof install`, hooks into Cursor and Claude Code to enforce this rule, and is distinct from donegate and no-vibes.

read1 min views1 publishedAug 18, 2026
Npx passproof install: agent can't say tests passed unless the runner printed
Image: Michielbdejong (auto-discovered)

If it says the tests passed, the runner output has to be in the same turn.

Does not run your tests. Blocks the claim.

agent:  All tests passed.
passproof:  blocked. no runner output in this turn.

$ pytest -q
3 passed in 0.12s
agent:  All tests passed.
passproof:  ok.
npx passproof install

That copies one file into the repo and wires Cursor (stop

  • afterShellExecution

) and Claude Code (Stop

  • PostToolUse

on Bash). Chat is free. “Done” is free. “All tests passed” without pytest/jest/vitest/cargo/go output in that turn is not.

npx passproof install --global
npx passproof uninstall
  • Not donegate. It does not re-run your suite when the agent stops. - Not no-vibes. It does not police the word “done”. - Not a prompt. CLAUDE.md will not save you. This is a hook.
npx passproof demo
node --test

MIT

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