# Write Tests > Add or improve tests based on a feature spec's acceptance criteria. Use when this capability is needed. - Skill: `tomevault-io/write-tests-6` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/write-tests-6` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/write-tests-6/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/write-tests-6 --- 1) Read project `AGENTS.md`, `codex.toml` (if present), and the feature spec acceptance criteria. 2) Propose a test matrix (unit/integration/edge cases). 3) Implement tests under `tests/`. 4) Run the project test command (from `codex.toml` if present; otherwise `uv run pytest -q`). 5) Update the feature spec Test plan section with what was added. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/rafaie) — claim your Tome and manage your conversions.