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claude-plugins: Instructions file for Claude Code

AGENTS.md

claude-plugins AGENTS.md is an instructions file for Claude Code, Codex, OpenCode from jontsai/claude-plugins. It costs 762 tokens per session, scanned A, original, MIT.

A set of working instructions for the jontsai/claude-plugins codebase, a marketplace that contains Claude Code plugins and validation scripts.

In plain words
What is it for?
Use it when editing plugins, skills, hooks, marketplace metadata, or validation-related files in that repository.
Why use it?
It helps coding agents follow the repository’s required file structure, configuration formats, and checks before changes are committed.

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: reads .claude/ paths; mentions .claude-plugin; mentions Claude Code.

This is jontsai/claude-plugins's own configuration. It tells Claude Code, Codex and OpenCode how to work on claude-plugins 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 claude-plugins 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 6repo changed yesterday A scan 762 tokens original MIT
View source ↗ jontsai/claude-plugins
Reuse

Borrowing it

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

Made for: Claude Code, Codex, OpenCode.

Wrote this? Show the measurements

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README.md
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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.

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<a href="https://agentmods.dev/instructions/jontsai/claude-plugins/agents-md"><img src="https://agentmods.dev/badge/instructions/jontsai/claude-plugins/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 762 This file is loaded in full into every session.
When invoked 762 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 $0.00762 $0.00762
Opus 5.5 $0.00305 $0.00305
Sonnet 5.5 $0.00152 $0.00152
Haiku 4.5 $0.00076 $0.00076

Measured yesterday against content hash 411c57adbf8d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

claude-plugins 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 yesterday.

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 · 97 lines

How it starts

The opening of the file, as written. The whole thing — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent Guidelines

Guidelines for LLMs working on this codebase.

Project Overview

This is a Claude Code plugins marketplace. It contains:

  • Marketplace definition: .claude-plugin/marketplace.json
  • Plugins: plugins/<name>/ directories
  • Validation scripts: scripts/validate_*.py
  • CI workflow: .github/workflows/validate.yml

Key Constraints

Plugin Structure

  1. Each plugin needs .claude-plugin/plugin.json with:

    • name, description, version, author

  2. Skills are auto-discovered from skills/*/SKILL.md

    • Do NOT add explicit skills array to marketplace.json
    • Each SKILL.md needs frontmatter with name and description

  3. hooks.json format is specific:

    • Must be object keyed by event name, NOT an array
    • Use ${CLAUDE_PLUGIN_ROOT} for paths in commands

Portability

Skills in this repo are used from several coding agents and many machines, so the portable unit is plugins/<name>/skills/<skill>/ and it must stay agent-agnostic:

  1. SKILL.md and bundled scripts must not name or assume a specific agent (no "Claude", "Codex", ~/.claude/... paths, or agent-only features). Refer to bundled files relative to the skill directory, e.g. scripts/foo.sh.
  2. Anything agent-specific (permission allowlists, hooks, marketplace metadata) lives outside the skill directory: in .claude-plugin/, hooks/, or as an adapter in install.sh.
  3. install.sh symlinks skills into each agent's skill directory. To support a new agent, add its parent directory to the detection list there; nothing inside a skill should change.
  4. Scripts should need only bash and python3. If a script is OS-specific, say so in the plugin README and fail clearly on other platforms.

Validation

Always run before committing:

./scripts/validate.sh

Or run individual validators:

python3 scripts/validate_json.py
python3 scripts/validate_marketplace.py
python3 scripts/validate_skills.py
python3 scripts/validate_hooks.py

Read the full file on GitHub · 97 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. yesterday Changed · +15 lines · +223 tokens per session 411c57adbf8d
  2. 1mo ago First seen · 82 lines · 539 tokens per session scan A e64c8b992fe4

Subscribe to this mod's changes

claude-plugins AGENTS.md is an instructions file published in the GitHub repository jontsai/claude-plugins (6 stars, last pushed yesterday), licensed MIT. It adds 762 tokens to every session, about $0.0030 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.

Claude Codeclaude-code-marketplaceclaude-code-pluginclaude-code-pluginsdeveloper-toolsplugins
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