Borrowing it
Nothing to install: this file belongs to comma-compliance/arc-relay. 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/comma-compliance/arc-relay/main/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/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/comma-compliance/arc-relay/agents-md"><img src="https://agentmods.dev/badge/instructions/comma-compliance/arc-relay/agents-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 | $0.01305 | $0.01305 |
| Opus 5.5 | $0.00522 | $0.00522 |
| Sonnet 5.5 | $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 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 — 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.
- 1mo 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 (53 stars, last pushed 23d ago), licensed MIT. It adds 1,305 tokens to every session, about $0.0052 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
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.
vscode oss-third-party-notices.instructions.md
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).
langchain AGENTS.md
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).
vscode design-tokens.instructions.md
Design-system size tokens (spacing, corner radius, font size, codicon size, stroke). Use when writing or editing CSS to size, space, or round UI — prefer the --vscode- token vars over hardcoded px values.