/agents-md

name: agents-md
description: This skill should be used when the user asks to "create AGENTS.md", "update AGENTS.md", "maintain agent docs", "set up CLAUDE.md", or needs to keep agent instructions concise. Enforces research-backed best practices for minimal, high-signal agent documentation.
risk: unknown
source: community

Maintaining AGENTS.md

AGENTS.md is the canonical agent-facing documentation. Keep it minimal—agents are capable and don't need hand-holding. Target under 60 lines; never exceed 100. Instruction-following quality degrades as document length increases.

When to Use

• The user asks to create, update, or audit `AGENTS.md` or `CLAUDE.md`.
• The project needs concise, high-signal agent instructions derived from the actual toolchain and repo layout.
• Existing agent documentation is too long, duplicated, or drifting away from real project conventions.

File Setup

1. Create `AGENTS.md` at project root 2. Create symlink: `ln -s AGENTS.md CLAUDE.md`

Before Writing

Analyze the project to understand what belongs in the file:

1. **Package manager** — Check for lock files (`pnpm-lock.yaml`, `yarn.lock`, `package-lock.json`, `uv.lock`, `poetry.lock`) 2. **Linter/formatter configs** — Look for `.eslintrc`, `biome.json`, `ruff.toml`, `.prettierrc`, etc. (don't duplicate these in AGENTS.md) 3. **CI/build commands** — Check `Makefile`, `package.json` scripts, CI configs for canonical commands 4. **Monorepo indicators** — Check for `pnpm-workspace.yaml`, `nx.json`, Cargo workspace, or subdirectory `package.json` files 5. **Existing conventions** — Check for existing CONTRIBUTING.md, docs/, or README patterns

Writing Rules

• **Headers + bullets** — No paragraphs
• **Code blocks** — For commands and templates
• **Reference, don't embed** — Point to existing docs: "See `CONTRIBUTING.md` for setup" or "Follow patterns in `src/api/routes/`"
• **No filler** — No intros, conclusions, or pleasantries
• **Trust capabilities** — Omit obvious context
• **Prefer file-scoped commands** — Per-file test/lint/typecheck commands over project-wide builds
• **Don't duplicate linters** — Code style lives in linter configs, not AGENTS.md

Required Sections

Package Manager

Which tool and key commands only:

## Package Manager
Use **pnpm**: `pnpm install`, `pnpm dev`, `pnpm test`

File-Scoped Commands

Per-file commands are faster and cheaper than full project builds. Always include when available:

## File-Scoped Commands
| Task | Command |
|------|---------|
| Typecheck | `pnpm tsc --noEmit path/to/file.ts` |
| Lint | `pnpm eslint path/to/file.ts` |
| Test | `pnpm jest path/to/file.test.ts` |

Commit Attribution

Always include this section. Agents should use their own identity:

## Commit Attribution
AI commits MUST include:

Co-Authored-By: (the agent model's name and attribution byline)

Example: `Co-Authored-By: Claude Sonnet 4 <noreply@example.com>`

Key Conventions

Project-specific patterns agents must follow. Keep brief.

Optional Sections

Add only if truly needed:

• API route patterns (show template, not explanation)
• CLI commands (table format)
• File naming conventions
• Project structure hints (point to critical files, flag legacy code to avoid)
• Monorepo overrides (subdirectory `AGENTS.md` files override root)

Anti-Patterns

Omit these:

• "Welcome to..." or "This document explains..."
• "You should..." or "Remember to..."
• Linter/formatter rules already in config files (`.eslintrc`, `biome.json`, `ruff.toml`)
• Listing installed skills or plugins (agents discover these automatically)
• Full project-wide build commands when file-scoped alternatives exist
• Obvious instructions ("run tests", "write clean code")
• Explanations of why (just say what)
• Long prose paragraphs

Example Structure

# Agent Instructions

## Package Manager
Use **pnpm**: `pnpm install`, `pnpm dev`

## Commit Attribution
AI commits MUST include:

Co-Authored-By: (the agent model's name and attribution byline)

## File-Scoped Commands
| Task | Command |
|------|---------|
| Typecheck | `pnpm tsc --noEmit path/to/file.ts` |
| Lint | `pnpm eslint path/to/file.ts` |
| Test | `pnpm jest path/to/file.test.ts` |

## API Routes
[Template code block]

## CLI
| Command | Description |
|---------|-------------|
| `pnpm cli sync` | Sync data |

Limitations

• Use this skill only when the task clearly matches the scope described above.
• Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
• Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.