Individual skill
possible-worlds-qa
Use when a product surface must be tested against extreme or hostile worlds. Not for design disputes: use possible-worlds. Not for remote, credential, publish, deploy, or irreversible changes.
.devin/skills/possible-worlds-qa/SKILL.md
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- Last checked
- Nov 4, 2026
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- Sep 28, 2026
- License
- Apache-2.0
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# Possible worlds QA
A passing test is not evidence that a surface is sound; it is evidence that one world was survivable.
This skill enumerates the worlds a surface can find itself in, then either measures what the surface
fails to cover or proves it can be broken.
## Contract
| Field | Bound contract |
|---|---|
| Trigger | A named product surface must be tested against extreme or hostile worlds rather than a green-check suite. |
| Authority | Reversible local: writes only named local test cases and report artifacts; rollback is deleting them. No remote mutation. No source or VCS mutation; states the rollback path before the first write. |
| Side effect | Test-case files and one report written to the local working tree. Deleting them reverses the run. |
| Done (completeness) | Every enumerated world is classified covered, gap, or untestable against a stated criterion, and the report names the world, observed behaviour, violated criterion or blocker, and test-case path for each. |