Q00/ouroboros is an Agent OS for running coding agents through interviews, staged evaluation, and repeated improvement cycles. It helps developers turn vague requests into tested code across multiple agent runtimes. Its catalogue add-ons provide workflows, agents, hooks, instructions, and integrations for operating those processes.
Borrowing it
Nothing to install: this file belongs to Q00/ouroboros. 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/Q00/ouroboros/main/AGENTS.mdgit clone --depth 1 https://github.com/Q00/ouroborosWrote 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/q00/ouroboros/agents-md)<a href="https://agentmods.dev/instructions/q00/ouroboros/agents-md"><img src="https://agentmods.dev/badge/instructions/q00/ouroboros/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/q00/ouroboros/agents-md"><img src="https://agentmods.dev/badge/instructions/q00/ouroboros/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 | $0.02040 | $0.02040 |
| Opus 5.5 | $0.00816 | $0.00816 |
| Sonnet 5.5 | $0.00408 | $0.00408 |
| Haiku 4.5 | $0.00204 | $0.00204 |
Grade A, and why
ouroboros 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 8d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- ouroboros CLAUDE.md — 91% identical, 46 lines differ
How it starts
The opening of the file, as written. The whole thing — 159 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ouroboros - Development Environment
This AGENTS.md is for local development only. End users install via:
Codex plugin marketplace add Q00/ouroboros Codex plugin add ouroboros@ouroborosOnce installed as a plugin, skills/hooks/agents work natively without this file.
ooo Commands (Dev Mode)
When the user types any of these commands, read the corresponding SKILL.md file and follow its instructions exactly:
| Input | Action |
|---|---|
ooo (bare, no subcommand) |
Read skills/welcome/SKILL.md and follow it |
ooo auto ... |
Read skills/auto/SKILL.md and follow it |
ooo interview ... |
Read skills/interview/SKILL.md and follow it |
ooo seed |
Read skills/seed/SKILL.md and follow it |
ooo run |
Read skills/run/SKILL.md and follow it |
ooo evaluate or ooo eval |
Read skills/evaluate/SKILL.md and follow it |
ooo evolve ... |
Read skills/evolve/SKILL.md and follow it |
ooo unstuck or ooo stuck or ooo lateral |
Read skills/unstuck/SKILL.md and follow it |
ooo status or ooo drift |
Read skills/status/SKILL.md and follow it |
ooo ralph |
Read skills/ralph/SKILL.md and follow it |
ooo tutorial |
Read skills/tutorial/SKILL.md and follow it |
ooo setup |
Read skills/setup/SKILL.md and follow it |
ooo welcome |
Read skills/welcome/SKILL.md and follow it |
ooo cancel |
Read skills/cancel/SKILL.md and follow it |
ooo qa or ooo qa ... |
Read skills/qa/SKILL.md and follow it |
ooo help |
Read skills/help/SKILL.md and follow it |
ooo update |
Read skills/update/SKILL.md and follow it |
ooo pm or ooo pm ... |
Read skills/pm/SKILL.md and follow it |
ooo brownfield or ooo brownfield ... |
Read skills/brownfield/SKILL.md and follow it |
ooo publish or ooo publish ... |
Read skills/publish/SKILL.md and follow it |
ooo resume-session |
Read skills/resume-session/SKILL.md and follow it |
Important: Do NOT use the Skill tool. Read the file with the Read tool and execute its instructions directly.
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.
- 29d ago Changed · +2 lines · +47 tokens per session 22e69e2f4d93
- 1mo ago First seen · 159 lines · 2,040 tokens per session scan A 7f2601393df2
ouroboros AGENTS.md is an instructions file published in the GitHub repository Q00/ouroboros (6,279 stars, last pushed today), licensed MIT. It adds 2,040 tokens to every session, about $0.0082 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.