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claudekit: Instructions file for Claude Code

AGENTS.md

claudekit AGENTS.md is an instructions file for Claude Code, Codex, OpenCode from duthaho/claudekit. It costs 916 tokens per session, scanned A, original, MIT.

A project guide for claudekit, a Claude Code plugin containing skills, agents, output styles, and hook scripts. It also documents the website and validation commands.

In plain words
What is it for?
Use it to understand the plugin structure, run validation and evidence checks, build the documentation website, and install the plugin locally.
Why use it?
It gives coding agents the project's build, test, architecture, and convention details needed to work on the repository safely.

Instructions file for Claude CodeCodexOpenCode

Written for Claude Code and Codex and OpenCode: PostToolUse hook event, but also the file is AGENTS.md. Also seen: mentions .claude-plugin; mentions Claude Code; mentions AGENTS.md.

This is duthaho/claudekit's own configuration. It tells Claude Code, Codex and OpenCode how to work on claudekit itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything claudekit configures →

not rated 97repo 3mo ago A scan 916 tokens original MIT
View source ↗ duthaho/claudekit claudekit.duthaho.dev
Reuse

Borrowing it

Nothing to install: this file belongs to duthaho/claudekit. 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/duthaho/claudekit/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/duthaho/claudekit

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.

agentmods badge for claudekit AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/duthaho/claudekit/agents-md/github.svg)](https://agentmods.dev/instructions/duthaho/claudekit/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/duthaho/claudekit/agents-md"><img src="https://agentmods.dev/badge/instructions/duthaho/claudekit/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 claudekit AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/duthaho/claudekit/agents-md"><img src="https://agentmods.dev/badge/instructions/duthaho/claudekit/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 916 This file is loaded in full into every session.
When invoked 916 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00916 $0.00916
Opus 5.5 $0.00366 $0.00366
Sonnet 5.5 $0.00183 $0.00183
Haiku 4.5 $0.00092 $0.00092

Measured 2mo ago against content hash 37245d654f16, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

claudekit 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 · 59 lines

How it starts

The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

What this is

claudekit — a Claude Code plugin (not an app): 15 skills, 8 agents, 5 output styles, and 3 hook scripts, distributed via a plugin marketplace. Almost everything is markdown consumed by Claude Code at runtime; the only buildable code is the docs website (website/, Astro Starlight). The only repo-level check is scripts/validate-plugin.cjs (skill anatomy + version sync).

Build, test, run

  • Plugin: nothing to build. Lint before committing: node scripts/validate-plugin.cjs — validates every SKILL.md against the 8-section anatomy and plugin/marketplace version sync; node scripts/token-report.cjs --check — enforces token budgets on skill/agent frontmatter; node scripts/test-verify-evidence.cjs — exercises the evidence gate (scripts/verify-evidence.cjs: citation resolution, fake-green tripwires, and --rerun claim-vs-actual test diffing). All three run in CI, .github/workflows/validate.yml.
  • Test by installing locally: /plugin marketplace add <path-or-repo> → /plugin install claudekit → /claudekit:init
  • Website (cd website/): npm install, npm run dev, npm run build, npm run preview. Deployed to Cloudflare via wrangler.jsonc (assets from ./dist).

Architecture

  • .claude-plugin/plugin.json — plugin manifest; .claude-plugin/marketplace.json — marketplace listing. Version lives in both files; bump them together.
  • skills/<name>/SKILL.md — one dir per skill. Only skills/init/ has extras: templates/ (hooks.json, mcp-servers.json, rules/*.md) that init scaffolds into a user's .claude/ dir.
  • agents/<name>.md — YAML frontmatter (name, description with embedded <example> blocks as an escaped single-line string, tools, memory: project)
    • system prompt body. See agents/tester.md.
  • output-styles/<name>.md — frontmatter must keep keep-coding-instructions: true.
  • scripts/*.cjs — Node hook scripts (PostToolUse etc.); they fail open — errors are swallowed by design (see scripts/auto-format.cjs).
  • website/src/content/docs/ — docs pages; reference/{skills,agents,output-styles,mcp-servers}.md mirror the plugin contents.

Read the full file on GitHub · 59 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. 2mo ago First seen · 59 lines · 916 tokens per session scan A 37245d654f16

Subscribe to this mod's changes

claudekit AGENTS.md is an instructions file published in the GitHub repository duthaho/claudekit (97 stars, last pushed 3mo ago), licensed MIT. It adds 916 tokens to every session, about $0.0037 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.

ai-assistantai-codingai-toolsanthropicautomationclaude
Related

claudekit AGENTS.md compared with instructions from other repositories

claudekit AGENTS.md next to 6 instructions from other repositories
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claudekit AGENTS.mdduthaho/claudekitInstructions file973mo agoMITA916Claude Code, Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143ktodayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode