Regression fix

Fix a bug by writing the failing regression test first, then making it pass.From its SKILL.md

Install

npx -y skills add ayaqen/Agents-Scripts --skill regression-fix

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

One thing to look at

2 stars2 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

1.7 KB, as published. Nobody here has run it

Test-first bug fixing. The failing test is both the proof you understood the bug and the guarantee it stays fixed.

Any confirmed bug in code that has (or should have) a test suite.
Especially when the bug already escaped once — a regression of a regression means the first fix shipped without a test.

Diagnose to root cause first (see debug-loop). A regression test written against a symptom pins the wrong behavior.
Write a test that fails for the right reason: run it, and check the failure message describes the actual bug, not a setup error or typo.
Name it so future readers find the story: reference the issue number or describe the scenario (test_parser_handles_crlf_only_input, not test_bug).
Put it where the suite conventions say it belongs — next to existing tests for the same module, matching their style and fixtures.
Apply the smallest fix that makes it pass. Resist bundling refactors; those go in a separate commit if genuinely needed.
Run the new test, then the surrounding suite. Both green → commit test and fix together (fix(...): ...) so the pair can never be separated by a revert.

Writing the test after the fix "to save time" — you never see it fail, so you don't know it tests anything. If you did fix first, git stash the fix and watch the test fail.
Over-broad tests that assert on incidental details; they'll break on unrelated changes and get deleted, taking your protection with them.
Skipping the test because "it's a one-liner". One-line bugs recur exactly as often as big ones.