What is airut CLAUDE.md?

Project instructions for Airut, a self-hosted gateway that runs Claude Code in isolated environments through email and Slack. They cover its security, deployment, channel setup, and repository workflows.

Use them when developing, configuring, deploying, or troubleshooting Airut’s email, Slack, container, security, networking, and repository-onboarding features.

They give a coding agent the project’s operating rules and documentation paths, including network restrictions and execution isolation.

airut CLAUDE.md — Instructions file for coding agents by airutorg: Project instructions for Airut, a self-hosted gateway that runs…

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add instructions/airutorg/airut/claude-md

Clone the repo

git clone --depth 1 https://github.com/airutorg/airut

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/airutorg/airut/claude-md.svg)](https://agentmods.dev/instructions/airutorg/airut/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/airutorg/airut/claude-md"><img src="https://agentmods.dev/badge/instructions/airutorg/airut/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 3,702 This file is loaded in full into every session.

When invoked 3,702 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

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	$0.03702	$0.03702
Opus 5	$0.01851	$0.01851
Sonnet 5	$0.00740	$0.00740
Haiku 4.5	$0.00370	$0.00370

Measured 5d ago against content hash c9f4d2e70beb, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

airut 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 5d 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 · 369 lines

How it starts

The opening of the file, as written. The whole thing — 369 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md - Operating Instructions for Airut

Project Overview

Airut is a self-hosted gateway that runs sandboxed Claude Code over email and Slack. Named "Airut" (Finnish: herald/messenger).

Network requests from containers are sandboxed; if requests fail, check .airut/network-allowlist.yaml. See doc/network-sandbox.md for details.

Documentation

High-level documentation in doc/ (see doc/README.md for full list):

doc/architecture.md — system architecture and data flow
doc/security.md — security model (channel auth, isolation, credentials)
doc/execution-sandbox.md — container isolation and resource limits
doc/network-sandbox.md — network allowlist and proxy architecture
doc/ci-sandbox.md — sandboxing GitHub Actions and CI pipelines
doc/deployment.md — installation and server configuration
doc/github-app-setup.md — GitHub App setup for agent identity
doc/email-setup.md — email channel setup (IMAP/SMTP, DMARC)
doc/slack-setup.md — Slack channel setup (Socket Mode, authorization rules)
doc/m365-oauth2.md — Microsoft 365 OAuth2 setup for email (IMAP/SMTP)
doc/repo-onboarding.md — onboarding new repositories
doc/gerrit-onboarding.md — Gerrit-specific onboarding
doc/agentic-operation.md — message-to-PR workflow patterns
doc/periodic-tasks.md — cron-triggered scheduled tasks with email delivery
doc/testing.md — test strategy, coverage enforcement, config migration testing

Implementation specs in spec/ (see spec/README.md for full list):

spec/gateway-architecture.md — core gateway design, channel abstraction, data flow, container execution
spec/authentication.md — DMARC verification and sender authorization
spec/repo-config.md — per-repo schema in server config
spec/declarative-config.md — declarative config layer (schema metadata, migration, diffing, round-trip, config variables)
spec/config-reload.md — live config reload (file watching, scope-aware application, deferred reload)
spec/multi-repo.md — multi-repository support design
spec/slack-channel.md — Slack channel implementation (Socket Mode)
spec/integration-tests.md — end-to-end test specification
spec/periodic-tasks.md — cron-triggered periodic tasks (scheduler, prompt/script modes, email delivery)
spec/sandbox.md — sandbox library for safe containerized Claude Code execution
spec/sandbox-action.md — reusable GitHub Action wrapping airut-sandbox
spec/sandbox-cli.md — standalone sandbox CLI for CI and other environments
spec/image.md — two-layer container image build strategy
spec/network-sandbox.md — proxy lifecycle, resource scoping, log format, crash recovery
spec/masked-secrets.md — scope-restricted credentials with proxy-level token replacement
spec/aws-sigv4-resigning.md — AWS SigV4/SigV4A credential masking via proxy re-signing
spec/request-body-filters.md — request-body filter pipeline (shared structure for service-specific payload filtering at the proxy layer)
spec/graphql-operation-allowlist.md — generic GraphQL operation filtering at the proxy layer
spec/anthropic-tool-domain-trim.md — proxy-side trimming of Anthropic server-side-tool allowed_domains to the airut network allowlist
spec/github-app-credential.md — GitHub App credential support with proxy-managed token rotation
spec/dashboard.md — web dashboard for task monitoring
spec/cli.md — CLI subcommands, service management, self-update
spec/pr-workflow-tool.md — PR workflow automation (ci.py, pr.py)
spec/local-ci-runner.md — CI runner (single source of truth for all CI checks)

Read the full file on GitHub · 369 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.

5d ago First seen · 369 lines · 3,702 tokens per session scan A c9f4d2e70beb

Subscribe to this mod's changes

airut CLAUDE.md is an instructions file published in the GitHub repository airutorg/airut (82 stars, last pushed today), licensed MIT. It adds 3,702 tokens to every session, about $0.0185 per session on Opus 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.

Cloud DevOps and cloud Security

airut CLAUDE.md

Getting it into your agent

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

CLAUDE.md - Operating Instructions for Airut

Project Overview

Documentation

What this file has done since we first saw it

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