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test-writer

Write and improve test-owned code: tests, test scripts, fixtures, evals, and test-only helpers. Use whenever Codex is asked to create or change test code. Its only job is to produce the strongest practical tests in the repository's existing harness, run them, and fix defects in the test code.

plugins/sno-ai/sno-station-skills/skills/test-writer/SKILL.md

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Last checked
Nov 4, 2026

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Repository last updated
Nov 6, 2026
License
Apache-2.0

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# Test Writer

Write the best test code for the requested behavior. Start with the repository and the
behavior.

## Test scope

- Run tests only for the changed behavior and its directly affected callers or integrations.
- Do not run full evaluation, unit, integration, repository, site, or all-module suites unless the owner explicitly requests them.
- A skill, PRD, reviewer, repository document, or default package script does not grant that permission.
- After a failure, rerun the failing case first. Once it passes, run only directly affected cases; do not expand by default.
- Build artifacts required for a requested deployment are not permission to run unrelated tests.
- Every development task has a finite budget including setup, execution, and reporting; before each run, estimate duration from available timings and name the changed behavior it verifies, using a stated estimate when timings are unknown rather than building a timing system or running a preliminary suite.
- Remove checks and repeated runs that neither establish the requested main function nor expose its defects; select the smallest useful test that fits the remaining development budget, never spend it on reassurance.