# Test A Skill > Field-test a skill by running it cold in parallel agent sessions, then turn what they hit into edits. - Skill: `will-ness-ai/test-a-skill` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add will-ness-ai/test-a-skill` - Raw SKILL.md: https://api.skillmd.com/api/skills/will-ness-ai/test-a-skill/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: AI & ML - Author: will-ness-ai (https://skillmd.com/u/will-ness-ai) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/will-ness-ai/test-a-skill --- A skill is a process, so reading it proves nothing. Run it. `/test-a-skill ` puts the skill in front of agents that have never seen it, on work you would really bring to it. What they produce shows whether it works. **What they had to guess shows what to fix** — that is the deliverable. ## 1. Pick three realistic scenarios Three inputs you would genuinely hand this skill, spread across the range you would genuinely use it on. Let them differ the way real work differs: in size, in subject, in how much explaining material happens to come with them. Three similar inputs test one thing three times. Realistic beats adversarial. A pathological input tells you how the skill behaves somewhere it will never go, then tempts you to spend the skill's words fixing that instead of the path every run takes. **Done when** each subject is work you would actually bring to this skill, and no two are alike. ## 2. Run it cold Pin the skill first — a copy, or a fixed commit. The working tree moves under a long run: another session switches branch and the folder is gone mid-flight. Then one agent per subject, in parallel, on your strongest model, as a **dynamic workflow**. Keep the whole fan-out in that one script: its agents are given no `Agent` or `Workflow` tool of their own, so a script that expects them to spawn anything quietly comes back empty. Where you are already inside a workflow, spawn `claude -p` headless instead. Give each agent a schema, so the gap reports arrive structured rather than parsed out of prose. Give each one the tools it needs rather than only a directory: a permission wall reads back as a defect in the skill, in every report at once. Each prompt carries the path to the skill file, plus enough to **mock the context window this skill would really fire into**: the request a human would type, the repo and branch they sit on, what they were doing just before, what they had already decided or read. A skill is never invoked into an empty session, so testing it against one tests a situation that never happens. The line runs at the skill's own job. Context is what the window would already hold before anyone typed the command. Briefing is what you add because you doubt the agent will do the right thing — and each of those is a gap you just found, so put it in the skill and let the next run prove it landed. A well-briefed agent only tests your briefing. Ask each agent to return, alongside its output: - what it actually ran: the commands, and the files it wrote - where the skill was silent on a decision it had to make - what it guessed - the hardest part - what was wrong, missing, or awkward in the skill, in its reference files, and in the skills it calls Say the gaps matter more than the deliverable, and that you want them blunt. **Done when** every agent has shown what it ran, or is named as having failed. A confident report proves a read, not a run. ## 3. Verify, then rank Check every claim against the skill, its reference files, and whatever code or tool it drives. Do this before you believe any of it. Then rank what survives by convergence: a gap three agents hit independently is real, where one agent's may be one agent's taste. Keep that order and never the reverse — agents sharing one sandbox manufacture identical false positives, so a unanimous gap is as likely to be a property of the harness you gave them as of the skill. The run this skill came from ranked "this file is unreadable" first on a 3/3 vote. The file was fine; the tester's own permission flag was not. **Done when** every reported gap is confirmed against the source or dismissed with a reason. ## 4. Offer the edits Call `/writing-for-agents`. Then hand the human one ranked list — the fix, the evidence, and how many agents hit it — and wait for their picks. **Done when** the human has chosen.