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grimoire: Instructions file for Claude Code

AGENTS.md

grimoire AGENTS.md is an instructions file for Claude Code, Codex, OpenCode from hon454/grimoire. It costs 1,983 tokens per session, scanned A, original, MIT.

A repository instruction file that defines how coding agents should work in the grimoire project. It covers the project's purpose, maintenance rules, commits, branches, manifests, and pull requests.

In plain words
What is it for?
Use it when making changes in the grimoire repository, especially when naming skills, preparing commits or branches, validating JSON manifests, or creating pull requests.
Why use it?
It gives agents one shared set of project-specific rules, reducing inconsistent changes and overlooked review or validation steps.

Instructions file for Claude CodeCodexOpenCode

Written for Claude Code and Codex and OpenCode: ${CLAUDE_PLUGIN_ROOT} variable, but also the file is AGENTS.md. Also seen: mentions .claude-plugin; mentions CLAUDE.md; mentions Claude Code.

This is hon454/grimoire's own configuration. It tells Claude Code, Codex and OpenCode how to work on grimoire 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 grimoire configures →

Runs only inside a plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else, and the catalogue could not identify which plugin ships it.

not rated 0repo changed 17d ago A scan 1,983 tokens original MIT
View source ↗ hon454/grimoire
Reuse

Borrowing it

Nothing to install: this file belongs to hon454/grimoire. 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/hon454/grimoire/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/hon454/grimoire

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 grimoire AGENTS.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/hon454/grimoire/agents-md"><img src="https://agentmods.dev/badge/instructions/hon454/grimoire/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 grimoire AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/hon454/grimoire/agents-md"><img src="https://agentmods.dev/badge/instructions/hon454/grimoire/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,983 This file is loaded in full into every session.
When invoked 1,983 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 $0.01983 $0.01983
Opus 5.5 $0.00793 $0.00793
Sonnet 5.5 $0.00397 $0.00397
Haiku 4.5 $0.00198 $0.00198

Measured 17d ago against content hash 056084058cfb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

grimoire 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 17d 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 · 87 lines

How it starts

The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.

grimoire: agent and contributor instructions

grimoire is a multi-plugin repository (a "spellbook") that ships the same plugins to Claude Code and Codex at the same time. Every plugin under plugins/ is a book. archmage is the required reading: it carries the meta skills that teach an agent how to use and extend the grimoire.

Human-facing docs (README, docs/) are written in Korean. Everything a harness reads (SKILL.md, hooks, manifests, scripts, this file) is written in English.

Layout

.claude-plugin/marketplace.json     generated: Claude Code marketplace (name: grimoire)
.agents/plugins/marketplace.json    generated: Codex marketplace (same plugin list)
plugins/<plugin>/                   one plugin per directory
  VERSION                           single source of the plugin version (semver)
  CHANGELOG.md                      Keep a Changelog; newest entry must equal VERSION
  .claude-plugin/plugin.json        Claude Code manifest
  .codex-plugin/plugin.json         Codex manifest (never a root plugin.json, see rules)
  skills/<skill>/SKILL.md           shared body, read by both harnesses
  skills/<skill>/agents/openai.yaml Codex UI metadata sidecar
  hooks/hooks.json                  shared body, read by both harnesses (optional)
  scripts/*.mjs                     Node scripts called by hooks and skills
claude-code-mods/<mod>/             Claude-only function-hook mod (ADR 0010): Claude manifest, hooks/hooks.json with "modules", tests/*.test.ts; never in the Codex marketplace
tools/grimoire.mjs                  maintainer tool: check, stamp, new-book, new-mod, dev-install (tools/dev.mjs)
tests/                              node --test suites for the tool, templates and hooks
docs/ARCHITECTURE.md                living overview of the current shape (Korean)
docs/PLUGIN-AUTHORING.md            how to make a book (Korean)
docs/decisions/NNNN-*.md            immutable decision records, MADR minimal + Y-statement (Korean)
docs/research/YYYY-MM-DD-*.md       immutable research notes that feed decisions (Korean)

Read the full file on GitHub · 87 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. 17d ago Changed · +54 lines · +1,685 tokens per session 056084058cfb
  2. 2mo ago First seen · 33 lines · 298 tokens per session scan A 5b30a598a4fa

Subscribe to this mod's changes

grimoire AGENTS.md is an instructions file published in the GitHub repository hon454/grimoire (0 stars, last pushed 16d ago), licensed MIT. It adds 1,983 tokens to every session, about $0.0079 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.

Building agentsCommitsGit and workflow
Related

grimoire AGENTS.md compared with instructions from other repositories

grimoire AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
grimoire AGENTS.mdhon454/grimoireInstructions file016d agoMITA1,983Claude Code, Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143kyesterdayMITA7,461Codex, 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