Ouroboros
local MCP serverOuroboros is a local MCP server: Pins an acceptance spec; the verify command and expected output never enter the success contract. Install it from pypi as ouroboros-ai.
Installation
Terminal
claude mcp add ouroboros -- uvx ouroboros-ai
Run in your project folder. Add --scope user to use it everywhere.
Claude Desktop, Cursor & other clients
Add to claude_desktop_config.json or .cursor/mcp.json.
{
"mcpServers": {
"ouroboros": {
"command": "uvx",
"args": [
"ouroboros-ai"
]
}
}
}What you need
- Runtime: Python with uv (runs with uvx).
- MCP client: Claude Code, Codex, Antigravity, Claude Desktop, Cursor or any other client that speaks MCP over stdio.
Summary
Pins an acceptance spec; the verify command and expected output never enter the success contract.
Ouroboros vs similar servers
| Server | Stars | Type | API key | Runtime |
|---|---|---|---|---|
| Ouroboros | 6,120 | Local | No | pypi |
| mockserver | 4,976 | Local | No | oci |
| agent-device | 4,793 | Local | No | npm |
| Emilia Protocol | 616 | Local | Yes | npm |
| Martin Loop | 410 | Local | No | npm |
Questions
No. The registry entry lists no keys or environment variables.
Python with uv (runs with uvx), plus an MCP client such as Claude Code, Codex, Claude Desktop or Cursor.
Ouroboros is a local MCP server distributed as the pypi package ouroboros-ai.
Run: claude mcp add ouroboros -- uvx ouroboros-ai
Run: codex mcp add ouroboros -- uvx ouroboros-ai
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NameStars
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