Borrowing it
Nothing to install: this file belongs to playcanvas/skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/playcanvas/skills/main/AGENTS.mdgit clone --depth 1 https://github.com/playcanvas/skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/playcanvas/skills/agents-md)<a href="https://agentmods.dev/instructions/playcanvas/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/playcanvas/skills/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/playcanvas/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/playcanvas/skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00410 | $0.00410 |
| Opus 5.5 | $0.00164 | $0.00164 |
| Sonnet 5.5 | $0.00082 | $0.00082 |
| Haiku 4.5 | $0.00041 | $0.00041 |
Grade A, and why
skills AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 27d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
PlayCanvas Skills
This repository ships one portable set of PlayCanvas Engine skills through Claude Code, Codex, Cursor, and Agent Skills-compatible installers.
Repository layout
skills/<name>/SKILL.mdis the canonical skill source. Every direct child ofskills/ships.- Surface-specific guidance belongs in a skill's
references/directory. .claude-plugin/,.codex-plugin/, and.cursor-plugin/contain host distribution metadata..agents/plugins/marketplace.jsonis the Codex marketplace manifest.scripts/andtest/contain release, contract, and runtime verification.
Keep skills directly under skills/. Nested category buckets are not part of this repository's
contract because the native Codex plugin validates direct skill children.
Skill changes
- Keep canonical guidance agent-agnostic. Do not add host-specific instructions or metadata inside a skill.
- Keep
SKILL.mdfrontmatter tonameanddescription; the name must match its directory. - Prefer installed package declarations, exports, shipped scripts, and official examples over copied snippets or assumed APIs.
- Add deterministic scripts only when agents would otherwise need to reimplement the same work.
- Keep skills short: descriptions ≤ 25 words,
SKILL.mdbodies ≤ 300 words. State engine facts and gotchas, not process or taste; cross-reference a rule instead of restating it. - Keep skills task-agnostic. Describe Engine capabilities, defaults, and gotchas that help with any task; do not describe specific use cases, genres, or example scenes.
- When adding or removing a skill, update the top-level README and the Claude plugin's explicit
skillsinventory.
Verification
Run the repository checks documented in CONTRIBUTING.md. At minimum, validate every skill, run the
Node test suite, and validate both the Claude and Codex plugin contracts before release.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 27d ago Changed · +4 lines · +84 tokens per session 6b1c6107ecaa
- 1mo ago First seen · 32 lines · 326 tokens per session scan A 37a728aff54a
skills AGENTS.md is an instructions file published in the GitHub repository playcanvas/skills (31 stars, last pushed 7d ago), licensed MIT. It adds 410 tokens to every session, about $0.0016 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.