Comparison · both free
Diff Risk Reviewer vs Test Plan from the Prompt
The short answer
The Diff Risk Reviewer reads the code the model wrote and names what could break. Test Plan from the Prompt reads what you asked for and lists the cases you forgot to ask about. Use the test plan before or during the build, the risk review on the finished diff.
Diff Risk Reviewer
Read a vibe-coded diff for behavior risk: what changed, what can break, and which check to run before you push.
- You paste
- Copy the diff, not the whole repo. From your editor or git, copy the unified diff for the change you are about to push. Keep it under a few hundred lines. If it is larger, review one file at a time.
- You get
- The check. Send the old cart fixture and assert the stored total matches the server sum, not the body.
- When to use it
- Use it when Cursor or Claude just wrote a change you did not type yourself and you need to know which behavior moved before you push.
- When to skip it
- It is not a style linter and it does not know your production traffic. If the diff touches payments or auth, a human reviewer still signs off.
- Runs in
- Cursor, Claude, ChatGPT
- 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 Diff Risk Reviewer and Test Plan from the Prompt?
The Diff Risk Reviewer reads the code the model wrote and names what could break. Test Plan from the Prompt reads what you asked for and lists the cases you forgot to ask about. Use the test plan before or during the build, the risk review on the finished diff.
Are Diff Risk Reviewer and Test Plan from the Prompt free?
Yes. Both are free prompts from One Agent a Day under CC BY 4.0. Diff Risk Reviewer runs in Cursor, Claude, ChatGPT. Test Plan from the Prompt runs in Cursor, Claude, ChatGPT.
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