mirage-playtest SKILL.md skillA
mirage-playtest from paraldameta/mirage-engine is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add paraldameta/mirage-engine/mirage-playtest@git:20261025.cd36420Pins git:20261025.cd36420 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- paraldameta/mirage-engine
- Path
agent/mirage-playtest/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261025.cd36420, committed Oct 25, 2026
- Size
- 6,462 bytes
- Repository stars
- 16
- License
- MIT
The agent self-test loop for a Mirage world - build, run it in the real Chrome, drive it with a scripted JSON scenario (walk routes, keys, interactions), collect screenshots, a contact sheet and metrics (positions, collision, console errors, flicker along a path, frame time), read the pass/fail report, fix, rerun. Use after any change to a Mirage world, before saying a world or module is done, and when the user says "test it", "playtest", "does it work", "check collisions", "is it flickering…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Playtest loop
**build → run → scripted inputs → screenshots + metrics → pass / fail → fix → rerun.** A world is done when its
scenario passes with 0 console errors *and* you have looked at the contact sheet. Tools drive the local Chrome
headless with the GPU (macOS default path, or `$CHROME`).
```bash
cd $MIRAGE/examples/<world>
npx vite build # or --outDir out/dist-<module> when others build too
node ../../packages/tools/src/playtest.mjs scenarios/playtest.json dist --out out/playtest
# -> out/playtest/report.md (read this), report.json, NN-<step>.png, sheet.png (look at this); exit 1 = fail
node ../../packages/tools/src/snap.mjs dist --out out/snap --game # every plan viewpoint, still path, sheet.png
```
The page contract: `window.__mirage = { world, built, play, g? }` and `window.__READY = true` (the skeleton's
`main.js` and every example do it). A `.html` single file works as the target too (opened from file://).
## Scenario (`scenarios/*.json`)
```json
{ "title": "pier: deck and rails", "query": "mode=walk&ui=0&grain=0&modules=shore,pier", "w": 1440, "h": 900,
"steps": [
…Read the whole file at its exact version.
How to install
mdr add paraldameta/mirage-engine/mirage-playtest@sha256:a9f8456ce5b587d1The line at the top of this page pins the label git:20261025.cd36420, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ct7cbzbi4lyjkgtw)
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Versions
The registry has recorded 1 version of this file, committed on Oct 25, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6462 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
paraldameta/mirage-engine · 16 stars · license MIT · pushed 2026-11-09 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ct7cbzbi4lyjkgtw GET https://markdownregistry.com/api/v1/resolve?ref=paraldameta/mirage-engine/mirage-playtest GET https://markdownregistry.com/api/v1/blob/a9f8456ce5b587d17b52ce2ffb57fc408fdc8bae521c0737b314168cc5a01292
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.