gru: Instructions file for Claude Code

CLAUDE.md

gru CLAUDE.md is an instructions file for Claude Code from fotoetienne/gru. It costs 4,135 tokens per session, scanned A, original, Apache-2.0.

Repository instructions for Gru, a Rust program that coordinates Claude Code sessions to work on GitHub issues and create pull requests.

In plain words
What is it for?
Use them when developing or reviewing Gru, especially when running its checks or installing it locally.
Why use it?
They give an agent the project context and the standard commands for building, testing, formatting, linting, and checking the code.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions Claude Code.

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

Reuse

Borrowing it

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

Made for: Claude Code.

Wrote this? Show the measurements

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Per session 4,135 This file is loaded in full into every session.
When invoked 4,135 The same file — it is already loaded in full.
Security scan A 1 finding. 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 $0.04135 $0.04135
Opus 5.5 $0.01654 $0.01654
Sonnet 5.5 $0.00827 $0.00827
Haiku 4.5 $0.00413 $0.00413

Measured 1mo ago against content hash 4908939acbf9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gru CLAUDE.md scanned grade A with 1 finding 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.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

- `child_process.rs` - Child process management utilities
CLAUDE.md · 345 lines

How it starts

The opening of the file, as written. The whole thing — 345 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

Gru is a local-first LLM agent orchestrator that autonomously works on GitHub issues using Claude Code. It manages "Minions" (agent sessions) that claim issues, implement fixes, create PRs, and respond to reviews.

Current Phase: V1 - Basic delegation to Claude Code CLI Language: Rust Architecture: Single binary, GitHub as state store, git worktrees for isolation

Build & Development Commands

# Build
just build

# Build with release optimizations
just build-release

# Run tests
just test

# Run tests with output
just test-verbose

# Run linter (with warnings as errors)
just lint

# Automatically fix clippy lints where possible
just fix-clippy

# Format code
just fmt

# Check formatting without modifying
just fmt-check

# Run all checks (format + lint + test + build)
just check

# Install locally
just install

# Clean build artifacts
just clean

# Show project information
just info

Pre-commit Hooks

The project uses git hooks from .githooks/ that automatically run:

  • Code formatting check (just fmt-check)
  • Linting (just lint)
  • Tests (just test)
  • Branch protection (blocks commits to main)
  • TODO/FIXME warnings (non-blocking)

To enable hooks:

git config core.hooksPath .githooks

When pre-commit hooks fail:

  1. Fix the issues using the suggested commands (e.g., just fmt or just fix-clippy)
  2. Review the diff with git diff to see what changed
  3. Stage the fixed files selectively with git add <files>
  4. Never use git add . or git add -A - always stage files explicitly
  5. Example workflow:
    git commit -m "Fix bug"
    # Pre-commit hook fails with formatting errors
    just fmt
    git diff              # Review what changed
    git add src/main.rs   # Stage only the files you want to commit
    git commit -m "Fix bug"
    

To bypass in emergencies:

git commit --no-verify

Read the full file on GitHub · 345 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. 1mo ago Changed · +1 lines · +25 tokens per session 4908939acbf9
  2. 2mo ago First seen · 344 lines · 4,110 tokens per session scan A d7c162cbc3b8

Subscribe to this mod's changes

gru CLAUDE.md is an instructions file published in the GitHub repository fotoetienne/gru (11 stars, last pushed 27d ago), licensed Apache-2.0. It adds 4,135 tokens to every session, about $0.0165 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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