Borrowing it
Nothing to install: this file belongs to leefowlercu/agent-kit. 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/leefowlercu/agent-kit/master/AGENTS.mdgit clone --depth 1 https://github.com/leefowlercu/agent-kitWrote 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/leefowlercu/agent-kit/agents-md)<a href="https://agentmods.dev/instructions/leefowlercu/agent-kit/agents-md"><img src="https://agentmods.dev/badge/instructions/leefowlercu/agent-kit/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/leefowlercu/agent-kit/agents-md"><img src="https://agentmods.dev/badge/instructions/leefowlercu/agent-kit/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 | $0.00976 | $0.00976 |
| Opus 5.5 | $0.00390 | $0.00390 |
| Sonnet 5.5 | $0.00195 | $0.00195 |
| Haiku 4.5 | $0.00098 | $0.00098 |
Grade A, and why
agent-kit 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.
How it starts
The opening of the file, as written. The whole thing — 125 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file provides guidance to Codex and Claude Code when working with code in this repository.
Project Overview
Agent Kit is a Claude Code and Codex plugin marketplace that extends agent capabilities through Skills, Subagents, Hooks, and MCP Server components. Plugins are organized in the plugins/ directory and registered in .claude-plugin/marketplace.json for Claude Code and .agents/plugins/marketplace.json for Codex.
Repository Architecture
.claude-plugin/
├── marketplace.json # Claude Code plugin registry
└── README.md
.agents/plugins/
├── marketplace.json # Codex plugin registry
└── README.md
plugins/
└── {plugin-name}/
├── .claude-plugin/
│ └── plugin.json # Claude Code plugin metadata
├── .codex-plugin/
│ └── plugin.json # Codex plugin metadata
├── README.md # Plugin documentation (required)
├── .mcp.json # MCP server configuration (optional)
├── agents/ # Custom agents or subagents (optional)
│ └── {agent}.md # Markdown with frontmatter
├── skills/ # Agent skills (optional)
│ └── {skill-name}/
│ ├── SKILL.md # Main skill definition (frontmatter + workflow)
│ ├── README.md # Skill documentation
│ ├── references/ # Supporting docs, schemas, templates
│ └── scripts/ # Validation/automation scripts
├── hooks/ # Event hooks (optional)
│ └── hooks.json # Hook configuration
└── scripts/ # Hook and utility scripts (optional)
└── {script}.sh|.py|.js
Repository Development
Updating marketplace.json
When modifying .claude-plugin/marketplace.json, reference the Claude Code plugin marketplace documentation. When modifying .agents/plugins/marketplace.json, reference the Codex plugin marketplace documentation.
Developing Plugins
When developing or updating plugins, reference the current Claude Code and Codex plugin documentation:
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 First seen · 125 lines · 976 tokens per session scan A 61adfb8c4a30
agent-kit AGENTS.md is an instructions file published in the GitHub repository leefowlercu/agent-kit (8 stars, last pushed 7d ago), licensed MIT. It adds 976 tokens to every session, about $0.0039 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 2026-08-31.
agent-kit AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| agent-kit AGENTS.mdleefowlercu/agent-kit | Instructions file | 8 | 7d ago | MIT | A | 976 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 5,649 | GitHub Copilot |
| 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 ai-customization.instructions.mdmicrosoft/vscode | Instructions file | 195k | today | MIT | A | 1,907 | GitHub Copilot |