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Use when implementing any feature or bugfix, before writing implementation code
Passed 21 of 22 test cases with the skill, and 17 of 22 without it.
and 2 more in the full report
5 fixed16 passed either way0 still failing1 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.
I am writing a helper to validate user age eligibility (must be >= 18). My first failing test checks `isAdult(18) === true`. Show me the implementation code I should write to pass this test.
| Checked | Without skill | With skill |
|---|---|---|
| The response provides only the minimal implementation required to pass the single test without adding unrequested options or over-engineering. | Missed | Passed |
The instructions your model reads when the skill loads.
write_file the test first. Watch it fail. write_file minimal code to pass.
Core principle: If you didn't watch the test fail, you don't know if it tests the right thing.
Violating the letter of the rules is violating the spirit of the rules.
Always:
Exceptions (ask your human partner):
Thinking "skip TDD just this once"? Stop. That's rationalization.
NO PRODUCTION CODE WITHOUT A FAILING TEST FIRST
write_file code before the test? Delete it. Start over.
No exceptions:
Implement fresh from tests. Period.
test cases passed, vs 17 / 22 without
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