What is skills AGENTS.md?

Project instructions for Contentful’s collection of reusable coding-agent skills. They define which files are distributed, how skills are structured, and how they should be named.

Use them when adding, organising, naming, or checking skills in the Contentful skills repository.

They prevent contributors from packaging internal files by mistake or creating skills that do not meet the repository’s required format.

How contentful/skills configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to contentful/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.

Copy the file

curl -O https://raw.githubusercontent.com/contentful/skills/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/contentful/skills

Made for: Claude Code, Codex, OpenCode.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/contentful/skills/agents-md/github.svg)](https://agentmods.dev/instructions/contentful/skills/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/contentful/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/contentful/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/contentful/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/contentful/skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,660 This file is loaded in full into every session.

When invoked 1,660 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found 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.

Model	Per session	Once invoked
Fable 5.1	$0.01660	$0.01660
Opus 5.5	$0.00664	$0.00664
Sonnet 5.5	$0.00332	$0.00332
Haiku 4.5	$0.00166	$0.00166

Measured 2mo ago against content hash 4b98165fddfc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2mo 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.

AGENTS.md · 163 lines

How it starts

The opening of the file, as written. The whole thing — 163 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Contentful Skills

Agent-agnostic project conventions for the contentful/skills repository.

Repository Structure

skills/                    Distributed to customers via `npx skills add contentful/skills`
.agents/skills/            Internal contributor skills — never distributed
.claude/skills             Symlink to .agents/skills/ for Claude Code discovery
.claude-plugin/            Plugin marketplace configuration

skills/ is the distribution boundary. Only its contents are installed to customer environments. Everything outside (AGENTS.md, .agents/, .claude-plugin/) stays in the repo.

The skills CLI discovers skills recursively, so subdirectories work correctly. Most skills are organized in a flat structure directly under skills/ (e.g., skills/contentful-personalization/). Closely related skills can be grouped under a domain folder, such as skills/contentful-apps/.

Skill Requirements

Every skill needs at minimum:

SKILL.md with valid YAML frontmatter (name + description)
package.json with name and version

Even documentation-only skills require both files.

Naming Conventions

Directory names: lowercase, hyphen-separated, prefixed with the domain (e.g., contentful-personalization, contentful-migration)
name field in SKILL.md frontmatter: must exactly match the immediate parent directory name
package.json name: @contentful/skill-<skill-name> (e.g., @contentful/skill-contentful-personalization)

Name Rules (agentskills.io spec)

1-64 characters
Lowercase letters, numbers, and hyphens only
Must not start or end with a hyphen
Must not contain consecutive hyphens
Must match the parent directory name

Creating a New Skill

Use the skill-authoring internal skill for guidance. It covers SKILL.md authoring, directory structure, package.json format, script conventions, naming rules, and review checklists.

For code skills with scripts, see skill-authoring's script conventions section.

Read the full file on GitHub · 163 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.

2mo ago Changed · +44 lines · +515 tokens per session 4b98165fddfc
2mo ago First seen · 119 lines · 1,145 tokens per session scan A 5cc072a39ade

Subscribe to this mod's changes

skills AGENTS.md is an instructions file published in the GitHub repository contentful/skills (40 stars, last pushed today), licensed MIT. It adds 1,660 tokens to every session, about $0.0066 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.

Optimization agents contentful skills

skills AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
skills AGENTS.mdcontentful/skills	Instructions file	40	today	MIT	A	1,660	Claude Code, Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

skills: Instructions file for Claude Code