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mu: Instructions file for Claude Code

CLAUDE.md

mu CLAUDE.md is an instructions file for Claude Code from micro/mu. It costs 39 tokens per session, scanned A, original, AGPL-3.0.

A set of Claude Code instructions for micro/mu, described as one home for agents, tools, and services.

In plain words
What is it for?
Use it to provide project-specific instructions to Claude Code while working on micro/mu.
Why use it?
The available information only identifies the project and its instruction context, so the specific problems it removes are unclear.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is micro/mu's own configuration. It tells Claude Code how to work on mu 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 mu configures →

not rated 438repo yesterday A scan 39 tokens AGPL-3.0
View source ↗ micro/mu micro.mu
Reuse

Borrowing it

Nothing to install: this file belongs to micro/mu. 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/micro/mu/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/micro/mu

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.

agentmods badge for mu CLAUDE.md

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

agentmods 80×15 button for mu CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/micro/mu/claude-md"><img src="https://agentmods.dev/badge/instructions/micro/mu/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 39 This file is loaded in full into every session.
When invoked 39 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 unknown 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 $0.00039 $0.00039
Opus 5.5 $0.00016 $0.00016
Sonnet 5.5 $0.00008 $0.00008
Haiku 4.5 $0.00004 $0.00004

Measured 2mo ago against content hash 6eeb4d2a7d8f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mu 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 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.

CLAUDE.md · 5 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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 · 5 lines · 39 tokens per session scan A 6eeb4d2a7d8f

Subscribe to this mod's changes

mu CLAUDE.md is an instructions file published in the GitHub repository micro/mu (438 stars, last pushed yesterday), licensed AGPL-3.0. It adds 39 tokens to every session, about $0.0002 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.

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