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.
npx agentmods add instructions/comma-compliance/arc-relay/agents-mdgit clone --depth 1 https://github.com/comma-compliance/arc-relayWrote 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/comma-compliance/arc-relay/agents-md)<a href="https://agentmods.dev/instructions/comma-compliance/arc-relay/agents-md"><img src="https://agentmods.dev/badge/instructions/comma-compliance/arc-relay/agents-md.svg" alt="Measured on agentmods" 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 | $0.01305 | $0.01305 |
| Opus 5 | $0.00652 | $0.00652 |
| Sonnet 5 | $0.00261 | $0.00261 |
| Haiku 4.5 | $0.00130 | $0.00130 |
Grade A, and why
arc-relay AGENTS.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.
How it starts
The opening of the file, as written. The whole thing — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arc Relay - AI Contributor Guide
This file provides context for AI coding tools (Claude Code, Cursor, Copilot) working on Arc Relay.
What is Arc Relay?
An open-source MCP (Model Context Protocol) control plane. Not just a proxy - it provides auth, user management, middleware-based policy controls, traffic interception, and archiving for AI tool calls. Built in Go with SQLite storage and a server-rendered web UI.
Project Structure
cmd/
arc-relay/ Server binary (CGO required - SQLite)
arc-sync/ CLI tool (pure Go, no CGO)
internal/
config/ TOML config parsing + env var overrides
docker/ Docker container lifecycle management
mcp/ MCP protocol types and endpoint classification
middleware/ Bidirectional middleware pipeline
archive.go Archive middleware (observe-only, sends to webhook)
archive_dispatcher.go Durable delivery with retry + circuit breaker
archive_encrypt.go NaCl Box payload encryption
sanitizer.go Pattern-based PII redaction/blocking
sizer.go Response size enforcement
alerter.go Pattern + size alerting (log/webhook)
middleware.go Pipeline core, registry, factory pattern
proxy/ MCP proxy backends
proxy.go Server manager, lifecycle, enumeration
stdio_bridge.go Docker stdin/stdout bridge
http_proxy.go HTTP forward proxy
remote_proxy.go Remote servers with OAuth
sse.go SSE response parsing
health.go Health monitoring + auto-recovery
store/ SQLite persistence
db.go Connection, migrations, backups
users.go Users, passwords (bcrypt), API keys (SHA-256)
sessions.go Web sessions
crypto.go AES-256-GCM config encryption
middleware.go Middleware config + events
archive_queue.go Durable delivery queue
access.go Endpoint access tiers
request_logs.go Audit logging
web/ HTTP handlers + templates
handlers.go All route handlers
templates/ Server-rendered HTML (13 templates)
oauth_provider.go OAuth 2.1 authorization server
device_auth.go Device code flow for CLI auth
cli/ CLI shared packages
config/ arc-sync config (~/.config/arc-sync/)
sync/ .mcp.json sync logic
relay/ HTTP client for Arc Relay API
project/ Project detection (Claude Code, Cursor)
safety/ Git safety checks
oauth/ OAuth 2.1 client (PKCE, auto-discovery)
auth/ Auth utilities
catalog/ MCP server registry
migrations/ Embedded SQL migrations (001-012)
skills/arc-sync/ Claude Code skill definition
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 · 142 lines · 1,305 tokens per session scan A 7e4398a3d460
arc-relay AGENTS.md is an instructions file published in the GitHub repository comma-compliance/arc-relay (57 stars, last pushed 5d ago), licensed MIT. It adds 1,305 tokens to every session, about $0.0065 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.
Other instructions, from other repositories
agent CLAUDE.md
Claude Code instructions for 1mcp-app/agent, covering claude.md, repository information, development commands, setup and build & run.
one-mcp AGENTS.md
Instructions for burugo/one-mcp, covering repository guidelines, project structure & module organization, build, test, and development commands, coding style & naming conventions and testing guidelines.
muster CLAUDE.md
Claude Code instructions for giantswarm/muster, covering claude.md, what is muster, build & development commands, build and install and testing.
preloop AGENTS.md
AGENTS.md instructions for preloop/preloop, covering preloop development guide, commands, git workflow, keep sample data generic and code style.
helio AGENTS.md
AGENTS.md instructions for gethelio/helio, covering helio, architecture, monorepo structure, tech stack and commands.
MCPbundler AGENTS.md
Instructions for eugenepyvovarov/MCPbundler, covering repository guidelines, project structure & module organization, documentation (obsidian), build, test, and development commands and headless stdio environment flags.