agents-md

agents-md is a skill for Claude Code, Codex from canonical/charm-tech. It costs 62 tokens per session (1,044 once invoked), scanned A, a copy of agents-md, Apache-2.0.

A skill for creating and maintaining AGENTS.md, the project instruction file used by coding agents, with CLAUDE.md linked to it.

In plain words
What is it for?
Use it to create or update AGENTS.md, set up the CLAUDE.md link, inspect package managers and build commands, and document monorepo structure or existing project rules.
Why use it?
It helps keep agent instructions short and based on the project’s actual tools, commands, layout, and conventions instead of copying unnecessary documentation.

Skill for Claude CodeCodex ✓ vendor

Written for no agent in particular: nothing here depends on one. Also seen: mentions CLAUDE.md; mentions AGENTS.md.

Good fit Use it to create or update AGENTS.md, set up the CLAUDE.md link, inspect package managers and build commands, and document monorepo structure or existing project rules.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/canonical/charm-tech/agents-md
About the project

canonical/charm-tech is a shared repository that stores the common standards, decisions, specifications, style guides, and templates used across Canonical Charm Tech repositories. The Charm Tech team uses it as a central source so its repositories can reference or reuse the same documentation, Python and Go conventions, security policies, and CI configuration.

canonical/charm-tech · 4 stars · on GitHub

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add canonical/charm-tech --skill agents-md
Clone the repo
git clone --depth 1 https://github.com/canonical/charm-tech

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for agents-md

README.md
[![agentmods](https://agentmods.dev/badge/skills/canonical/charm-tech/agents-md/github.svg)](https://agentmods.dev/skills/canonical/charm-tech/agents-md)
Your own site
<a href="https://agentmods.dev/skills/canonical/charm-tech/agents-md"><img src="https://agentmods.dev/badge/skills/canonical/charm-tech/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.

agentmods 80×15 button for agents-md

Your own site · 80×15
<a href="https://agentmods.dev/skills/canonical/charm-tech/agents-md"><img src="https://agentmods.dev/badge/skills/canonical/charm-tech/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 62 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,044 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 88% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00062 $0.01044
Opus 5.5 $0.00025 $0.00418
Sonnet 5.5 $0.00012 $0.00209
Haiku 4.5 $0.00006 $0.00104

Measured 1mo ago against content hash 79095aa8a8a9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

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.

Origin

This is a copy

88% identical to agents-md — 19 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/meta/agents-md/SKILL.md · 122 lines

How it starts

The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.

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.

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` |

Read the full file on GitHub · 122 lines

Changes

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.

  1. 1mo ago First seen · 122 lines · 62 tokens per session scan A 79095aa8a8a9

Subscribe to this mod's changes

agents-md is a skill published in the GitHub repository canonical/charm-tech (4 stars, last pushed 7d ago), licensed Apache-2.0. It adds 62 tokens to every session and 1,044 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 88% identical to agents-md, differing in 19 lines, and is treated as a copy.

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