Comparison · both free
Flake Hunter vs Test Plan from the Prompt
The short answer
Test Plan from the Prompt decides which tests a new feature needs. Flake Hunter figures out why an existing test fails at random. One is before you write tests, the other is after they start lying.
Flake Hunter
Paste a test that passes locally but fails in CI one run in five, plus the failure log. Get the likely causes ranked and a real fix, not another retry.
- You paste
- Grab the evidence. Copy the failing test, any setup or helpers it uses, and the exact CI failure output. Add how often it fails and anything you know about how CI runs tests (parallel workers, sharding, random order).
- You get
- Fix + repro. Sort by created_at, then id. Filter the list to this test's posts. Repro: run the file 50 times with 4 workers.
- When to use it
- Use it when a test passes on your machine every time and fails in CI one run in five, and everyone just hits re-run.
- When to skip it
- It ranks likely causes from the test and log you paste. It cannot run your CI, so confirm with the repro it gives you.
- Runs in
- Claude, ChatGPT, Cursor, Claude Code
- Difficulty
- Medium
- Shelf
- Coding & Vibe Coding
Test Plan from the Prompt
Paste the prompt you used to vibe-code a feature. Get the checks to run before merge, including the case that prompt forgot.
- You paste
- Paste the original prompt. Use the prompt you gave the coding agent, not a cleaned-up spec you wrote afterward. The gaps in that prompt are the point.
- You get
- Later. The 7-day boundary and the hidden button are listed as follow-ups, not pretended to be done.
- When to use it
- Use it right after you vibe-code a feature, when the happy path works and the cases you never mentioned are untested.
- When to skip it
- It writes the checks, not the test code. Ask your coding agent to implement the cases once you agree with the list.
- Runs in
- Cursor, Claude, ChatGPT
- Difficulty
- Medium
- Shelf
- Coding & Vibe Coding
Questions
What is the difference between Flake Hunter and Test Plan from the Prompt?
Test Plan from the Prompt decides which tests a new feature needs. Flake Hunter figures out why an existing test fails at random. One is before you write tests, the other is after they start lying.
Are Flake Hunter and Test Plan from the Prompt free?
Yes. Both are free prompts from One Agent a Day under CC BY 4.0. Flake Hunter runs in Claude, ChatGPT, Cursor, Claude Code. Test Plan from the Prompt runs in Cursor, Claude, ChatGPT.
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