Ouroboros

Ouroboros is an open-source Agent OS that adds a disciplined, replayable workflow layer on top of AI coding agents. Launched in 2026, it has about 6,300 stars on GitHub and is under very active development.

Overview

Ouroboros starts from a simple diagnosis: most AI coding fails at the input, not the output. Instead of letting an agent guess at a vague request, Ouroboros runs a Socratic interview that exposes hidden assumptions and reports an ambiguity score, then crystallizes the answers into an immutable Seed specification before any code is written. Execution is Seed-bound and recorded in a ledger, so runs are replayable and auditable, and results pass through a three-stage automated evaluation gate rather than a human shrug. A budgeted evolution loop then lets the agent iterate across generations while the grading criteria stay out of the success contract handed to it. The layer works across 14 runtimes — Claude Code, Codex CLI, Gemini CLI, OpenCode, Copilot, Kiro, Goose, Antigravity, Grok, and more — and exposes an MCP server for integration.

Key Features

• Interview-gated workflow: a Socratic interview with an ambiguity score turns vague ideas into testable specs
• Immutable Seed specs: intent is locked before execution, so architecture does not drift mid-build
• Staged evaluation: a three-stage automated gate verifies results instead of trusting appearances
• Budgeted evolution loop: the agent iterates and improves across generations within set budgets
• 14 runtimes: Claude Code, Codex CLI, Gemini CLI, OpenCode, Copilot, Kiro, Goose, Antigravity, and more
• Replayable ledger: every action is Seed-bound and recorded, making runs observable and auditable
• MCP server: integrate the workflow into any MCP-compatible host

💳 Pricing

Ouroboros is free and open source under the MIT license. You pay only for the underlying coding-agent and model usage it orchestrates.

Who Is It For

Developers who run coding agents on real projects and want spec-first discipline, verification, and a replayable record instead of prompt-and-pray.