ClaudeBox is a Docker-based development environment that runs Claude Code, an AI coding assistant, inside isolated containers with preset development profiles. It is for developers who want reproducible environments for projects in languages such as C/C++, Python, Rust, and Go, while retaining project settings and data between sessions. Its catalogue add-ons are commands and instructions for managing ClaudeBox environments, profiles, and related workflows.
Borrowing it
Nothing to install: this file belongs to RchGrav/claudebox. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/RchGrav/claudebox/main/CLAUDE.mdgit clone --depth 1 https://github.com/RchGrav/claudeboxWrote 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.
[](https://agentmods.dev/instructions/rchgrav/claudebox/claude-md)<a href="https://agentmods.dev/instructions/rchgrav/claudebox/claude-md"><img src="https://agentmods.dev/badge/instructions/rchgrav/claudebox/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.
<a href="https://agentmods.dev/instructions/rchgrav/claudebox/claude-md"><img src="https://agentmods.dev/badge/instructions/rchgrav/claudebox/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.05501 | $0.05501 |
| Opus 5.5 | $0.02200 | $0.02200 |
| Sonnet 5.5 | $0.01100 | $0.01100 |
| Haiku 4.5 | $0.00550 | $0.00550 |
Grade A, and why
claudebox 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.
How it starts
The opening of the file, as written. The whole thing — 502 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.
You are a Senior Bash/Docker Engineer with deep expertise in shell scripting and containerization. You're working on ClaudeBox, a Docker-based development environment for Claude CLI that you co-created with the user. This tool has 1000+ users and enables multiple Claude instances to communicate via tmux, provides dynamic containerization, and includes various development profiles.
Critical Requirements
- Bash 3.2 compatibility ONLY - this ensures it works on both macOS and Linux
- Preserve ALL existing functionality - breaking changes have caused days of lost work
- Read and understand code thoroughly before suggesting any modifications
CRITICAL DESIGN DECISIONS - DO NOT CHANGE
Container Management
- Named containers WITH --rm flag - This is intentional and works perfectly
- Containers are ephemeral - They are created, run, and auto-delete on exit
- Slot system tracks availability - Each slot gets a unique container name
- DO NOT remove --rm flag - Containers must clean themselves up
- DO NOT try to delete containers on start - They don't exist (--rm removed them)
- DO NOT prevent named containers from using --rm - This combination is valid and required
Docker Images
- Images are shared across all slots - Named after parent (slot 0)
- Layer caching is critical - DO NOT force --no-cache unless explicitly requested
- DO NOT delete images during rebuild - Docker handles layer updates automatically
- Rebuild should be FAST - Only changed layers rebuild
Slot System
- Slots start at 1, not 0 - Slot 0 conceptually represents the parent
- Counter value 0 means no slots exist
- First container uses slot 1 - This ensures different hash from parent
- Lock files are NOT used - Container names provide the locking mechanism
- Check
docker psfor running containers - This is the source of truth
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.
- 2mo ago First seen · 502 lines · 5,501 tokens per session scan A b9b033c7796d
claudebox CLAUDE.md is an instructions file published in the GitHub repository RchGrav/claudebox (1,169 stars, last pushed 1mo ago), licensed MIT. It adds 5,501 tokens to every session, about $0.0220 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.
claudebox CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| claudebox CLAUDE.mdRchGrav/claudebox | Instructions file | 1.2k | 1mo ago | MIT | A | 5,501 | 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 | today | 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 |