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.
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 skills/q00/ouroboros/pmnpx skills add Q00/ouroboros --skill pmgit 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/skills/q00/ouroboros/pm)<a href="https://agentmods.dev/skills/q00/ouroboros/pm"><img src="https://agentmods.dev/badge/skills/q00/ouroboros/pm.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 | $0.00042 | $0.05441 |
| Opus 5 | $0.00021 | $0.02721 |
| Sonnet 5 | $0.00008 | $0.01088 |
| Haiku 4.5 | $0.00004 | $0.00544 |
Grade A, and why
pm scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -s --max-time 3 https://api.github.com/repos/Q00/ouroboros/releases/latest | grep -o '"tag_name": "[^"]*"' | head -1 How it starts
The opening of the file, as written. The whole thing — 464 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/ouroboros:pm
PM-focused Socratic interview that produces a Product Requirements Document.
Instructions
Step 0: Version Check (runs before the PM interview)
Before starting the PM interview, check if a newer version is available:
# Fetch latest release tag from GitHub (timeout 3s to avoid blocking)
curl -s --max-time 3 https://api.github.com/repos/Q00/ouroboros/releases/latest | grep -o '"tag_name": "[^"]*"' | head -1
Compare the result with the current version in the active runtime's local plugin metadata (for Claude installs this is .claude-plugin/plugin.json).
- If a newer version exists, ask the user through the active runtime's
ask_usercapability:{ "questions": [{ "question": "Ouroboros <latest> is available (current: <local>). Update before starting?", "header": "Update", "options": [ {"label": "Update now", "description": "Update plugin to latest version (restart required to apply)"}, {"label": "Skip, start PM interview", "description": "Continue with current version"} ], "multiSelect": false }] }- If "Update now":
- On Claude-plugin installs only:
- Run
claude plugin marketplace update ouroborosvia the active runtime'srun_shellcapability (refresh marketplace index). If this fails, tell the user "⚠️ Marketplace refresh failed, continuing…" and proceed. - Run
claude plugin update ouroboros@ouroborosvia the active runtime'srun_shellcapability (update plugin/skills). If this fails, inform the user and stop — do NOT proceed to the package-manager step.
- Run
- On non-Claude runtimes, skip Claude plugin commands and proceed directly to the package-manager step for
ouroboros-ai; do not require Claude-only commands or tools.
- Detect the user's Python package manager and upgrade the MCP server:
- Check which tool installed
ouroboros-aiby running these in order:uv tool list 2>/dev/null | grep "^ouroboros-ai "→ if found, useuv tool upgrade ouroboros-aipipx list 2>/dev/null | grep "^ ouroboros-ai "→ if found, usepipx upgrade ouroboros-ai- Otherwise, print: "Also upgrade the MCP server:
pip install --upgrade ouroboros-ai" (do NOT run pip automatically)
- Check which tool installed
- Tell the user: "Updated! Restart your session to apply, then run
ooo pmagain."
- On Claude-plugin installs only:
- If "Skip": proceed immediately.
- If "Update now":
- If versions match, the check fails (network error, timeout, rate limit 403/429), or parsing fails/returns empty: silently skip and proceed.
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 · 464 lines · 42 tokens per session scan A b11cf575acb0
pm is a skill published in the GitHub repository Q00/ouroboros (5,765 stars, last pushed yesterday), licensed MIT. It adds 42 tokens to every session and 5,441 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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