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.
npx agentmods add instructions/expo/skills/agents-mdgit clone --depth 1 https://github.com/expo/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/expo/skills/agents-md)<a href="https://agentmods.dev/instructions/expo/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/expo/skills/agents-md.svg" alt="Measured on agentmods" 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 | $0.02543 | $0.02543 |
| Opus 5 | $0.01272 | $0.01272 |
| Sonnet 5 | $0.00509 | $0.00509 |
| Haiku 4.5 | $0.00254 | $0.00254 |
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 4d 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 — 277 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Expo Skills Repository
This repository contains official Expo AI agent skills. The primary distribution format is a Claude Code plugin marketplace, but the skills should stay useful to any agent that can consume SKILL.md files.
Repository Structure
.claude-plugin/
marketplace.json # Claude Code marketplace catalog
.agents/
plugins/
marketplace.json # Codex marketplace catalog
.cursor-plugin/
marketplace.json # Cursor marketplace catalog
plugins/
expo/
.claude-plugin/
plugin.json # Claude Code plugin manifest
.codex-plugin/
plugin.json # Codex plugin manifest
.cursor-plugin/
plugin.json # Cursor plugin manifest
.grok-plugin/
plugin.json # Grok Build plugin manifest
.mcp.json # Claude Code and Codex MCP server configuration
mcp.json # Cursor MCP server configuration
skills/
README.md # Grouped index of all skills
skill-name/
SKILL.md # Main skill file
references/ # Optional supporting documentation
scripts/ # Optional utility scripts
agents/
openai.yaml # Codex trigger metadata
README.md # Plugin documentation
README.md # User-facing installation instructions
CONTRIBUTING.md # Contributor guidance (adding skills, naming, free vs paid)
skills.sh.json # skills.sh catalog groupings
scripts/ # CI checks (skill limits, plugin version bump)
The Claude Code marketplace currently exposes expo as the active plugin. It also keeps deprecated aliases such as expo-app-design, upgrading-expo, and expo-deployment pointing at ./plugins/expo for backward compatibility. The Codex and Cursor marketplaces expose only the active expo plugin because their marketplace entries must match the plugin manifest name.
Plugin Manifest
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.
- 4d ago First seen · 277 lines · 2,543 tokens per session scan A 6a3a17d7d935
skills AGENTS.md is an instructions file published in the GitHub repository expo/skills (2,497 stars, last pushed today), licensed MIT. It adds 2,543 tokens to every session, about $0.0127 per session on Opus 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).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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 oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.