What is claude-plugins CLAUDE.md?

Repository instructions for a Claude plugin marketplace, where plugins are stored in separate directories and distributed through a central registry.

Use them when adding or editing plugins, skills, marketplace entries, or the files that control what gets packaged.

They clarify which files ship to users, how plugins and skills must be laid out, and how plugins should remain independent. This prevents local documentation or cross-plugin references from accidentally becoming part of a release.

How Londeren/claude-plugins configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Londeren/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/Londeren/claude-plugins/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/Londeren/claude-plugins

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/londeren/claude-plugins/claude-md/github.svg)](https://agentmods.dev/instructions/londeren/claude-plugins/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/londeren/claude-plugins/claude-md"><img src="https://agentmods.dev/badge/instructions/londeren/claude-plugins/claude-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/londeren/claude-plugins/claude-md"><img src="https://agentmods.dev/badge/instructions/londeren/claude-plugins/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,456 This file is loaded in full into every session.

When invoked 1,456 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.

Model	Per session	Once invoked
Fable 5.1	$0.01456	$0.01456
Opus 5.5	$0.00582	$0.00582
Sonnet 5.5	$0.00291	$0.00291
Haiku 4.5	$0.00146	$0.00146

Measured 1mo ago against content hash 85bd4f1b0532, 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 CLAUDE.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 1mo 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.

CLAUDE.md · 88 lines

How it starts

The opening of the file, as written. The whole thing — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Repository-wide guidance for Claude Code. Each plugin's own editing rules live in a separate file under docs/, imported below; read the one for a plugin before changing anything inside its directory.

@docs/prompt-writer-editing-rules.md @docs/book-to-skill-editing-rules.md

What this is

A plugin marketplace for Claude: .claude-plugin/marketplace.json at the root, one entry per plugin. Markdown only, no build, no tests, no dependencies.

This repository holds meta-skills only: skills that build or improve other prompts and skills. A domain skill, one that carries a method taken from a book, a course or an author, lives in Londeren/bookshelf-skills, one plugin per method, with its build pipeline next to it. Here it gets a marketplace entry with a git-subdir source, a row in the root README table and its install routes in the root README, nothing else.

Only what lives inside a plugins/<name>/ directory ships to users. docs/, tmp/, this file and the root README never do.

Plugins in the repository:

plugins/prompt-writer/ - a methodology for writing LLM prompts. Editing rules: docs/prompt-writer-editing-rules.md.
plugins/book-to-skill/ - turns a Markdown knowledge source into a generated Claude skill. Editing rules: docs/book-to-skill-editing-rules.md.

Adding a plugin

A meta-skill in this repository:

plugins/<name>/ with .claude-plugin/plugin.json, skills/<skill>/SKILL.md, README.md, LICENSE.
An entry in the plugins[] array of .claude-plugin/marketplace.json.
docs/<name>-editing-rules.md if the skill needs its own editing rules, imported from this file and listed above.
A row in the plugin table of the root README.

A domain skill is built in bookshelf-skills by that repository's own rules. Here it takes steps 2 and 4 plus its install routes in the root README. Its marketplace entry carries an English description whatever the language of the skill, and its source points into the other repository:

Read the full file on GitHub · 88 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.

1mo ago Changed · +16 lines · +299 tokens per session 85bd4f1b0532
2mo ago First seen · 72 lines · 1,157 tokens per session scan A e060b8006a67

Subscribe to this mod's changes

claude-plugins CLAUDE.md is an instructions file published in the GitHub repository Londeren/claude-plugins (5 stars, last pushed 1mo ago), licensed MIT. It adds 1,456 tokens to every session, about $0.0058 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-plugins CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
claude-plugins CLAUDE.mdLonderen/claude-plugins	Instructions file	5	1mo ago	MIT	A	1,456	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

claude-plugins: Instructions file for Claude Code