Borrowing it
Nothing to install: this file belongs to majorcontext/moat. 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/majorcontext/moat/main/CLAUDE.mdgit clone --depth 1 https://github.com/majorcontext/moatWrote 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/majorcontext/moat/claude-md)<a href="https://agentmods.dev/instructions/majorcontext/moat/claude-md"><img src="https://agentmods.dev/badge/instructions/majorcontext/moat/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/majorcontext/moat/claude-md"><img src="https://agentmods.dev/badge/instructions/majorcontext/moat/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 | $0.03199 | $0.03199 |
| Opus 5.5 | $0.01280 | $0.01280 |
| Sonnet 5.5 | $0.00640 | $0.00640 |
| Haiku 4.5 | $0.00320 | $0.00320 |
Grade A, and why
moat 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.
How it starts
The opening of the file, as written. The whole thing — 216 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
Moat runs AI agents in isolated containers with credential injection and full observability. Key features:
- Isolated Execution - Each moat runs in its own container (Docker or Apple containers) with workspace mounting
- Credential Injection - Transparent auth header injection via TLS-intercepting proxy (agent never sees raw tokens)
- Smart Image Selection - Automatically selects container images based on
moat.yamlruntime config - Full Observability - Captures logs, network requests, and traces for every run
- Declarative Config - Configure agents via
moat.yamlmanifests - Multi-Runtime Support - Automatically uses Apple containers (macOS 26+) or Docker
Architecture
cmd/moat/ CLI entry point (Cobra commands)
internal/
audit/ Tamper-proof audit logging with cryptographic verification
claude/ Claude Code settings and Dockerfile generation
cli/ Shared CLI helpers (environment parsing, mount helpers)
codex/ Codex CLI settings and Dockerfile generation
config/ moat.yaml parsing, mount string parsing
container/ Container runtime abstraction (Docker and Apple containers)
credential/ Secure credential storage (GitHub, Anthropic, AWS)
daemon/ Proxy daemon lifecycle, Unix socket API, and run registration
image/ Runtime-based image selection (node/python/go → base image)
log/ Structured logging (slog wrapper)
provider/ Provider registry and interfaces (CredentialProvider, AgentProvider)
providers/ Provider implementations:
aws/ AWS IAM role assumption and credential endpoint
claude/ Claude Code CLI, grants, and config generation
codex/ Codex CLI, grants, and config generation
github/ GitHub token management and refresh
run/ Run lifecycle management (create/start/stop/destroy)
storage/ Per-run storage for logs, traces, network requests
ui/ TTY-aware colored output and formatting helpers
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 First seen · 216 lines · 3,199 tokens per session scan A aa1716770564
moat CLAUDE.md is an instructions file published in the GitHub repository majorcontext/moat (49 stars, last pushed 4d ago), licensed MIT. It adds 3,199 tokens to every session, about $0.0128 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 2026-09-01.
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Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
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Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
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AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
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Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.