Agent OS: the agent gets smarter on its own. We just hold the line: Interview-gated, staged evaluation, budgeted evolution loop. MCP server, 14 runtimes: Claude Code, Codex CLI, Gemini CLI, OpenCode, Copilot, Kiro and more.
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Agent OS: the agent gets smarter on its own. We just hold the line: Interview-gated, staged evaluation, budgeted evolution loop. MCP server, 14 runtimes: Claude Code, Codex CLI, Gemini CLI, OpenCode,
Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.
Does Ouroboros need an API key?
No required environment variable is listed on this record.
What transport does Ouroboros use?
Ouroboros runs locally over stdio.
When was Ouroboros last checked?
Last checked 2026-11-08. English | 한국어 | 简体中文 ◯ ─────────── ◯ O U R O B O R O S ◯ ─────────── ◯ It gets smarter on its own. We just hold the line. Skip the prompt engineering. The agent runs, fails, and gets smarter every generation. The grading command and expected result never make it into the success contract we hand it. The Agent OS for replayable AI coding workflows Quick Start · Why · Results · How It Works · Comman
From the publisher
Documentation
# Windows (PowerShell) — no Python needed; installs Git and uv for you
irm https://raw.githubusercontent.com/Q00/ouroboros/main/scripts/install.ps1 | iex
Demo videos for each runtime.
Turn a vague idea into a verified, working codebase -- across Claude Code, Codex CLI, OpenCode, Hermes, Gemini, Kiro, Copilot, Pi, OMP, Zcode, Goose, GJC, Antigravity, and Grok.
Ouroboros is an Agent OS for AI coding: a local-first runtime layer that
turns non-deterministic agent work into a replayable, observable, policy-bound
execution contract. It replaces ad-hoc prompting with a structured
specification-first workflow: interview, crystallize, execute, evaluate,
evolve.
The Ouroboros Agent OS Stack
Like any OS, Ouroboros is split into a stable OS layer of primitives, an
application layer of domain workflows, and a shell that humans actually
sit in front of. Three repos, one stack:
Layer
Repo
Role
What it gives you
Key features
01. Agent OS: the agent gets smarter on its own
02. We just hold the line: Interview-gated, staged evaluation, budgeted evolution loop
03. MCP server, 14 runtimes: Claude Code, Codex CLI, Gemini CLI, OpenCode, Copilot, Kiro and more
04. English | 한국어 | 简体中文 ◯ ─────────── ◯ O U R O B O R O S ◯ ─────────── ◯ It gets smarter on its own
The kernel (ouroboros) owns the contract: every action becomes a
Seed-bound, ledger-recorded, replayable event — regardless of which LLM
executes it.
Plugins (ouroboros-plugins) declare scoped capabilities against that
contract, so domain workflows (review a PR, triage a Linear ticket, run a
release) stay auditable and policy-bound instead of being one-off prompts.
Ourocode is the terminal shell: it surfaces MCP state, interview
questions, and wonderTool decisions as first-class TUI elements, so you can
drive the OS without leaving the keyboard or switching between CLIs.
Use ouroboros alone with any supported CLI, layer plugins on for domain
workflows, or install ourocode when you want a unified terminal cockpit.
Disclaimer. The Ouroboros project and community are not affiliated with
any cryptocurrency, token, memecoin, or trading community — including, but
not limited to, any "ouroboros" tickers on pump.fun or other launchpads. This
is an open-source developer tool. We do not issue, endorse, or hold any
coins. Any token claiming association with this project is unauthorized.
Naming note. A separate, unaffiliated open-source project also uses the
name "Ouroboros" — Anton Razzhigaev's self-modifying, autonomous-memory agent
at github.com/razzant/ouroboros. No shared code, no relationship. This
project locks a specification before executing rather than rewriting its own
architecture; if you're looking for the latter, that's the other one.
Why Ouroboros?
Most AI coding fails at the input, not the output. The bottleneck is not AI capability -- it is human clarity.
# Windows (PowerShell 5.1+ or pwsh 7+) — nothing to install first
irm https://raw.githubusercontent.com/Q00/ouroboros/main/scripts/install.ps1 | iex
The Windows installer installs Git and uv through winget when they are missing,
lets uv download its own Python, then installs ouroboros-ai and wires the
host it finds. Native Windows is experimental and Codex CLI needs WSL 2; see
platform support.
First command — open your AI coding agent and run these in order:
> ooo setup
> ooo interview "I want to build a task management CLI"
ooo setup is a one-time configuration step. ooo interview is the first
workflow command and starts the Socratic interview. After setup, Codex follows
its currently selected model and Claude Code starts with its recommended model
settings. Choose Directly configure models only when you want to pin a
stage to a specific model; it opens the local settings screen in your browser.
You can return to those settings any time with ooo config.
Or from a plain terminal, without an agent host:
$ ouroboros init start --orchestrator "I want to build a task management CLI tool"
Works with Claude Code, Codex CLI, GitHub Copilot CLI, OpenCode, Hermes, Gemini, Kiro CLI, Pi CLI, OMP CLI, Zcode, Goose, GJC, Antigravity CLI, and Grok Build CLI. The installer detects available runtimes and registers the MCP server where the host supports it. For explicit selection, run ouroboros setup --runtime <opencode|kiro|copilot|gemini|pi|omp|zcode|goose|gjc|antigravity|grok> after installation. Copilot live-discovers its subscription catalog via the GitHub Copilot models API; Kiro's settings picker queries the authenticated CLI with kiro-cli chat --listmodels -f json, so account and enterprise allow-list changes appear without a hardcoded model table.
DeepSeek support. Ouroboros speaks DeepSeek two ways. Point the interview/Seed/QA pipeline at DeepSeek's own models with --llm-backend dsh (ouroboros mcp serve --runtime claude-cli --llm-backend dsh, or OUROBOROS_LLM_BACKEND=dsh) — this drives DeepSeek Harness's ACP server under the hood. Or go the other way: install the dsh-ouroboros plugin (dsh plugin --profile <your-profile> add "github:Q00/ouroboros#main&path:integrations/dsh-plugin") and type ooo interview / ooo auto directly in the DeepSeek Harness chat — the same ouroboros_interview / ouroboros_auto tools run natively inside it, Socratic questions and all. Both directions, including what the dsh backend needs beyond the one variable, are in the DeepSeek Harness guide.
Needs codex on your PATH and uvx on the host (the plugin's MCP descriptor
launches the server with it). Install uv with pipx install uv,
pip install --user uv, or brew install uv.
Start a new Codex session, then run these commands in order:
ooo setup
ooo interview "Build a task management CLI"
ooo setup is the one-time runtime preparation. Once ready, Ouroboros follows
Codex's current default model; choose Directly configure models only when
you want to pin a specific model for a pipeline stage.
pipx install 'ouroboros-ai[mcp]' # or: uv tool install 'ouroboros-ai[mcp]'
ouroboros setup --runtime kiro # detects Kiro CLI, registers MCP server, and
# writes OUROBOROS_RUNTIME=kiro into
# ~/.kiro/settings/mcp.json (the trusted,
# setup-managed location -- a project .env
# is untrusted input and this key is ignored there)
Then use ooo commands inside a Kiro CLI session.
gh auth login # one-time GitHub auth (used for live model discovery)
pipx install 'ouroboros-ai[mcp]' # or: uv tool install 'ouroboros-ai[mcp]'
ouroboros setup --runtime copilot # discovers models live, picks a default,
# registers MCP server in ~/.copilot/mcp-config.json
Restart your Copilot CLI session, then use ooo commands inside it. Model-ID mapping is catalog-gated: the prior direct and OpenRouter Opus 5 pins resolve to claude-opus-5 when that ID is present; current Anthropic API pins convert only their trailing numeric separator and only when the discovered catalog contains the exact candidate. Unknown IDs remain unchanged so Copilot reports an explicit unavailable-model error instead of silently selecting a different model. Leave role models unset so setup writes a discovered ID, or set a Copilot-valid ID explicitly. See the Copilot runtime guide.
Claude Code plugin only (no Python package or global Python to install; the
host needs uv, which provides both uvx for the MCP server and the skills'
Python >= 3.12 fallback):
claude plugin marketplace add Q00/ouroboros && claude plugin install ouroboros@ouroboros
Then run ooo setup inside a Claude Code session.
pip / uv / pipx:
pip install 'ouroboros-ai[mcp,tui]' && ouroboros setup --runtime claude-cli # recommended MCP v2 default
pip install 'ouroboros-ai[claude]' # Claude Agent SDK profile (MCP 1.x, isolated)
pip install 'ouroboros-ai[claude-cli]' # dependency-free Claude CLI worker
pip install 'ouroboros-ai[claude-sdk]' # explicit alias for the Claude SDK profile
pip install 'ouroboros-ai[litellm]' # + LiteLLM multi-provider; Python 3.12-3.13
pip install 'ouroboros-ai[mcp]' # MCP v2 server/client without the GUI
pip install 'ouroboros-ai[tui]' # settings GUI only
pip install 'ouroboros-ai[all]' # MCP 1.x app bundle; excludes MCP 2 by design
ouroboros setup # configure runtime
Core and non-LiteLLM installs support Python 3.12-3.14. LiteLLM-bearing installs ([litellm], [all], and source --extra all) support Python 3.12-3.13; use Python 3.13 for current examples. See Platform Support.
The recommended standalone installation is ouroboros-ai[mcp,tui] followed by
an explicit MCP v2-compatible runtime selection. The example uses
--runtime claude-cli; substitute another compatible runtime such as codex,
opencode, hermes, gemini, goose, kiro, copilot, pi, or gjc.
Use [claude] and [claude-sdk] only in isolated MCP 1.x environments.
pip install 'ouroboros-ai[mcp]' is valid for embedding the MCP client/server library in an already isolated Python environment, but host registration requires uvx --isolated --python '>=3.12' or pipx. Use pipx install 'ouroboros-ai[mcp]' or uv tool install 'ouroboros-ai[mcp]' before ouroboros setup --runtime <claude-cli|codex|opencode|hermes|gemini|goose|kiro|copilot|pi|gjc>; setup exits without changing runtime configuration when neither isolated launcher is available.
Legacy compatibility: ouroboros-ai[dashboard] is still accepted as a compatibility alias/no-op; it does not install dashboard runtime payload. ouroboros-ai[all] includes that no-op alias only for compatibility.
Installing as an MCP server: use 0.51.1 or later. Earlier versions can fail at startup with Failed to reconnect to plugin:ouroboros:ouroboros: -32000 when an existing environment shadows the [mcp] profile (#2012). This matters if you install through a downstream package rather than PyPI, since those can lag.
What You Get
After one loop of the Ouroboros cycle, a vague idea becomes a verified codebase:
Step
Before
After
Interview
"Build me a task CLI"
12 hidden assumptions exposed, ambiguity scored to 0.19
Seed
No spec
Immutable specification with acceptance criteria, ontology, constraints
Each cycle does not repeat -- it evolves. The output of evaluation feeds back as input for the next generation, until the system truly knows what it is building.
Phase
What Happens
Interview
Socratic questioning exposes hidden assumptions
Seed
Answers crystallize into an immutable specification
Wonder ("What do we still not know?") -> Reflect -> next generation
"This is where the Ouroboros eats its tail: the output of evaluationbecomes the input for the next generation's seed specification."
-- reflect.py
Convergence is reached when ontology similarity >= 0.95 -- when the system has questioned itself into clarity.
Ralph: The Loop That Never Stops
ooo ralph runs the evolutionary loop persistently -- across session boundaries -- until convergence is reached. Each step is stateless: the EventStore reconstructs the full lineage, so even if your machine restarts, the serpent picks up where it left off.
Ralph Cycle 1: evolve_step(lineage, seed) -> Gen 1 -> action=CONTINUE
Ralph Cycle 2: evolve_step(lineage) -> Gen 2 -> action=CONTINUE
Ralph Cycle 3: evolve_step(lineage) -> Gen 3 -> action=CONVERGED
+-- Ralph stops.
The ontology has stabilized.
Commands
Inside AI coding agent sessions, use ooo <cmd> skills. From the terminal, use the ouroboros CLI.
Skill (ooo)
CLI equivalent
What It Does
ooo setup
ouroboros setup
Register runtime and configure project (one-time)
ooo interview
ouroboros init start
Socratic questioning -- expose hidden assumptions
ooo auto
ouroboros auto
Goal → A-grade Seed → execution handoff with bounded loops
ooo seed
(generated by interview)
Crystallize into immutable spec
ooo run
ouroboros run seed.yaml
Execute via Double Diamond decomposition
ooo evaluate
(via MCP)
3-stage verification gate
ooo evolve
(via MCP)
Evolutionary loop until ontology converges
ooo unstuck
(via MCP)
5 lateral thinking personas when you are stuck
ooo status
ouroboros status executions / ouroboros status execution <id>
Session tracking + (MCP-only) drift detection
ooo resume-session
ouroboros resume
List in-flight sessions and re-attach commands
ooo cancel
ouroboros cancel execution [<id>|--all]
Cancel stuck or orphaned executions
ooo ralph
(via MCP)
Persistent loop until verified
ooo tutorial
(interactive)
Interactive hands-on learning
ooo help
ouroboros --help
Full reference
ooo pm
(via MCP)
PM-focused interview + PRD generation
ooo qa
(via skill)
General-purpose QA verdict for any artifact
ooo update
ouroboros update
Check for updates + upgrade to latest
ooo brownfield
(via skill)
Scan and manage brownfield repo/worktree defaults
ooo publish
(skill/runtime surface; uses gh CLI)
Publish a Seed as GitHub Epic/Task issues for team workflows
Not all skills have direct CLI equivalents. Some (evaluate, evolve, unstuck, ralph, publish) are available through agent skills, runtime rules, or MCP tools rather than a direct ouroboros <subcommand> shell command.
/resume is reserved for Claude Code's built-in session picker; use ooo resume-session for Ouroboros in-flight sessions.
Claude Code also reserves /run, /status, /help, and /config. The safe
direct skill forms are /ouroboros:ouroboros-run,
/ouroboros:ouroboros-status, /ouroboros:ouroboros-help, and
/ouroboros:ouroboros-config; the familiar ooo run, ooo status,
ooo help, and ooo config phrases remain supported.
Brownfield -- Auto-detects config files across multiple language ecosystems
Evolution -- Up to 30 generations, convergence at ontology similarity >= 0.95
Stagnation -- Detects spinning, oscillation, no-drift, and diminishing returns patterns
Agent OS runtime -- Replayable execution contract across capability discovery, policy, directives, event journal, and agent processes
Runtime backends -- Pluggable abstraction layer (orchestrator.runtime_backend config) with first-class support for every canonical backend returned by runtime_backend_choices(), including GJC, Antigravity, Grok, and Zcode; same workflow spec, different execution engines
Wonder -> "How should I live?" -> "What IS 'live'?" -> Ontology
-- Socrates
Every great question leads to a deeper question -- and that deeper question is always ontological: not "how do I do this?" but "what IS this, really?"
Wonder Ontology
"What do I want?" -> "What IS the thing I want?"
"Build a task CLI" -> "What IS a task? What IS priority?"
"Fix the auth bug" -> "Is this the root cause, or a symptom?"
This is not abstraction for its own sake. When you answer "What IS a task?" -- deletable or archivable? solo or team? -- you eliminate an entire class of rework. The ontological question is the most practical question.
Ouroboros embeds this into its architecture through the Double Diamond:
The first diamond is Socratic: diverge into questions, converge into ontological clarity. The second diamond is pragmatic: diverge into design options, converge into verified delivery. Each diamond requires the one before it -- you cannot design what you have not understood.
The Interview does not end when you feel ready -- it ends when the math says you are ready. Ouroboros quantifies ambiguity as the inverse of weighted clarity:
Ambiguity = 1 - Sum(clarity_i * weight_i)
Each dimension is scored 0.0-1.0 by the LLM (temperature 0.1 for reproducibility), then weighted:
Dimension
Greenfield
Brownfield
Goal Clarity -- Is the goal specific?
40%
35%
Constraint Clarity -- Are limitations defined?
30%
25%
Success Criteria -- Are outcomes measurable?
30%
25%
Context Clarity -- Is the existing codebase understood?
--
15%
Threshold: Ambiguity <= 0.2. A score above that blocks Seed generation. Passing force explicitly is what gets past it, and the CLI puts that choice on screen next to continue and cancel. The gate is a default worth arguing with, not a lock.
Why 0.2? Because at 80% weighted clarity, the remaining unknowns are small enough that code-level decisions can resolve them. Above that threshold, you are still guessing at architecture.
The evolutionary loop does not run forever. It stops when consecutive generations produce ontologically identical schemas. Similarity is measured as a weighted comparison of schema fields:
Do the same field names exist in both generations?
Type match
30%
Do shared fields have the same types?
Exact match
20%
Are name, type, AND description all identical?
Threshold: Similarity >= 0.95 -- the loop converges and stops evolving.
But raw similarity is not the only signal. The system also detects pathological patterns:
Signal
Condition
What It Means
Stagnation
Similarity >= 0.95 for 3 consecutive generations
Ontology has stabilized
Oscillation
Gen N ~ Gen N-2 (period-2 cycle)
Stuck bouncing between two designs
Repetitive feedback
>= 70% question overlap across 3 generations
Wonder is asking the same things
Hard cap
30 generations reached
Safety valve
Gen 1: {Task, Priority, Status}
Gen 2: {Task, Priority, Status, DueDate} -> similarity 0.78 -> CONTINUE
Gen 3: {Task, Priority, Status, DueDate} -> similarity 1.00 -> CONVERGED
Two mathematical gates, one philosophy: do not build until you are clear (Ambiguity <= 0.2), do not stop evolving until you are stable (Similarity >= 0.95).
Contributing
git clone https://github.com/Q00/ouroboros
cd ouroboros
uv sync --python 3.13 --all-groups
uv run --python 3.13 --no-sync pytest
Ouroboros is MIT-licensed and built in the open. If it saves you rework — or you want the loop to keep evolving — consider sponsoring. Sponsorship directly funds maintenance, new runtime integrations, and sponsor-only deep-dive content.
Every sponsor keeps the serpent evolving. Thank you.
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