mcollina/skills is a collection of reusable instructions that guide AI-assisted development for Node.js, Fastify, TypeScript, documentation, OAuth, GitHub, and related workflows. It is for developers using coding agents who want specialized guidance for these tasks, and the catalogue entries are skills and instructions from that collection.
Borrowing it
Nothing to install: this file belongs to mcollina/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/mcollina/skills/main/AGENTS.mdgit clone --depth 1 https://github.com/mcollina/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/mcollina/skills/agents-md)<a href="https://agentmods.dev/instructions/mcollina/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/mcollina/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/mcollina/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/mcollina/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 | $0.00652 | $0.00652 |
| Opus 5.5 | $0.00261 | $0.00261 |
| Sonnet 5.5 | $0.00130 | $0.00130 |
| Haiku 4.5 | $0.00065 | $0.00065 |
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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.
This file provides guidance to AI coding agents like Claude Code (claude.ai/code), Cursor AI, Codex, Gemini CLI, GitHub Copilot, and other AI coding assistants when working with code in this repository.
What this repository is
- This is a skills/prompt library for AI-assisted development (not a typical application service).
- Primary content lives under
skills/as Markdown skill definitions and rule documents. src/index.tsis minimal and only exportsversion; it is not where product logic lives.
High-level architecture
1) Skill packages (skills/<skill-name>/)
Each skill directory is a self-contained package of guidance:
SKILL.md: entrypoint for the skill (metadata, when-to-use, instructions, links)rules/*.md: detailed rule documents referenced fromSKILL.md
Current top-level skills include:
documentationfastifyinitlinting-neostandard-eslint9nodenodejs-coreoauthoctocatskill-optimizersnipgraphertypescript-magician
2) Minimal TypeScript package surface (src/)
src/index.tsexports package version only.- TypeScript config (
tsconfig.json) is strict andnoEmit; this repo uses TS checks, not a compile output pipeline.
3) Documentation-driven behavior
- Most “logic” is instruction text in Markdown.
- Internal cross-references in
SKILL.mdfiles (for examplerules/...) are part of the public skill structure and should stay valid.
Common commands
Run from repository root.
- Install deps:
npm install - Typecheck:
npm run typecheck - Lint:
npm run lint - Run tests:
npm test(alias fornode --test) - Run a single test file:
node --test path/to/file.test.ts - Run tests matching a name:
node --test --test-name-pattern "pattern"
Editing rules for this repo
- Treat
skills/*/SKILL.mdas an index contract.- Every
rules/*.mdfile must be explicitly mentioned and linked from that skill’s mainSKILL.md. - If you add/rename/remove any
rules/*.md, update the corresponding links inSKILL.mdin the same change.
- Every
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.
- 1mo ago First seen · 72 lines · 652 tokens per session scan A fd93e1fbc325
skills AGENTS.md is an instructions file published in the GitHub repository mcollina/skills (1,960 stars, last pushed 9d ago), licensed MIT. It adds 652 tokens to every session, about $0.0026 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).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.