Borrowing it
Nothing to install: this file belongs to Grail-Computer/FastClaw. 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/Grail-Computer/FastClaw/main/AGENTS.mdgit clone --depth 1 https://github.com/Grail-Computer/FastClawWrote 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/grail-computer/fastclaw/agents-md)<a href="https://agentmods.dev/instructions/grail-computer/fastclaw/agents-md"><img src="https://agentmods.dev/badge/instructions/grail-computer/fastclaw/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/grail-computer/fastclaw/agents-md"><img src="https://agentmods.dev/badge/instructions/grail-computer/fastclaw/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 | $0.02029 | $0.02029 |
| Opus 5.5 | $0.00812 | $0.00812 |
| Sonnet 5.5 | $0.00406 | $0.00406 |
| Haiku 4.5 | $0.00203 | $0.00203 |
Grade A, and why
FastClaw 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 — 192 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md — FastClaw
What This Is
FastClaw is a Slack/Telegram bot backed by an autonomous AI agent (OpenAI Codex CLI). It receives messages from Slack or Telegram, queues them as tasks in a SQLite database, runs Codex in a sandboxed subprocess to produce answers, and posts the results back. It ships with an admin dashboard for configuration, monitoring, and approvals.
Production deployment: Railway (Docker).
Repo Layout
FastClaw/
├── grail/ # Main Rust workspace (this is the product)
│ ├── Cargo.toml # Workspace root
│ └── crates/
│ ├── grail-server/ # Core: web server, worker, admin UI, DB
│ │ ├── src/ # All Rust source (see below)
│ │ ├── (no templates)
│ │ └── migrations/ # SQLite migrations (applied on startup)
│ ├── grail-slack-mcp/ # MCP tool server for Slack API
│ └── grail-web-mcp/ # MCP tool server for Brave search + web fetch
├── frontend/ # React admin dashboard source
├── codex/ # Vendored OpenAI Codex CLI (Git submodule)
├── guardrails/ # Vendored Guardrails AI library (Git submodule)
├── nanobot/ # Vendored Nanobot agent (Git submodule)
├── coworker/ # Coworker agent (Git submodule)
├── Dockerfile # Multi-stage: build Rust → Debian slim + Codex CLI
├── entrypoint.sh # Drops privileges, runs grail-server
├── railway.json # Railway deploy config (Dockerfile builder, healthcheck)
├── slack-app-manifest.yaml # Slack app scopes and event subscriptions
└── .env.example # All supported environment variables
Source Files (grail/crates/grail-server/src/)
| File | Purpose |
|---|---|
main.rs |
Axum web server, /admin React SPA serving, admin JSON API mount, Slack/Telegram webhooks, health, Slack signature verification |
worker.rs |
Background task processor: claims tasks, builds Codex prompts, spawns Codex CLI subprocess, parses agent output, sends replies |
db.rs |
All SQLite operations (settings CRUD, task queue, sessions, cron, guardrails, approvals, secrets) |
models.rs |
Shared structs (Task, Session, Settings, etc.) |
slack.rs |
SlackClient — post messages, upload files, download files, fetch channel history |
telegram.rs |
Telegram webhook payload types and message-sending client |
codex.rs |
Codex CLI subprocess management: spawn, stream output, parse structured responses |
codex_login.rs |
ChatGPT device login / OAuth flow for Codex authentication |
approvals.rs |
Approval request lifecycle (create, decide, check) |
config.rs |
CLI args via clap (--port, --data-dir, etc.) |
crypto.rs |
AES-GCM encryption/decryption for stored secrets |
secrets.rs |
Secret retrieval (env vars → encrypted SQLite fallback) |
guardrails.rs |
Apply guardrail rules to shell commands before execution |
cron_expr.rs |
Cron expression parsing helpers |
bootstrap.rs |
First-run setup and data directory initialization |
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 · 192 lines · 2,029 tokens per session scan A 7d98485121cf
FastClaw AGENTS.md is an instructions file published in the GitHub repository Grail-Computer/FastClaw (11 stars, last pushed 8mo ago), licensed Apache-2.0. It adds 2,029 tokens to every session, about $0.0081 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).
deno copilot-instructions.md
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.