mcpbeat Sign in

Ouroboros MCP Server

local only

Ouroboros runs on your own machine — the client starts it, so there is no endpoint to ping. 38 424 installs a week from pypi. Last commit 25 Oct 2026.

Pins an acceptance spec; the verify command and expected output never enter the success contract.

Installs per day peak 7 700 · avg 3 955 · +18% w/w
a month agotoday
38 424
Installs / week
pypi · ouroboros-ai
6 270
Stars
74 open issues
25 Oct 2026
Last commit
from GitHub
MIT
License
Python

What the code does

We read the source, 16 h ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Runs a command on install [пакет] package.json:1
setup.py: выполняет код при установке пакета
File ships in the package but is absent from the source [пакет] src/ouroboros/_version.py:1
этот файл ставится пользователю, но в репозитории его нет
        loaded = yaml.load(snapshot.contents.decode("utf-8"), Loader=_UniqueKeyLoader)
    exec(compile(source, path, "exec", dont_inherit=True), main.__dict__)
Known vulnerability in the package ouroboros-ai · GHSA-c4m7-2gwp-vw76
Known vulnerability in the package ouroboros-ai · GHSA-jv2h-4p9v-wf5w
Known vulnerability in the package ouroboros-ai · PYSEC-2026-2857
    env = dict(os.environ if base_env is None else base_env)

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add ouroboros -- uvx ouroboros-ai
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "ouroboros": {
      "command": "uvx",
      "args": [
        "ouroboros-ai"
      ]
    }
  }
}
~/.codex/config.toml
[mcp_servers.ouroboros]
command = "uvx"
args = ["ouroboros-ai"]
.cursor/mcp.json
{
  "mcpServers": {
    "ouroboros": {
      "command": "uvx",
      "args": [
        "ouroboros-ai"
      ]
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "ouroboros": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "ouroboros-ai"
      ]
    }
  }
}

Alternatives to Ouroboros

same job, measured the same way
S
Srbryant86
by srbryant86

Sign AI output for EU AI Act + FRE 902 compliance, verify content authenticity provenance

19 installs/wk local only
Twothumbs
by asselwan

Verifies AI agent work end to end: real artifacts and outcomes checked, not self-reported success.

3 tools answering
1099Policy
by 1099policy

Verify, quote and track contractor insurance in your 1099Policy account.

answering
Correctover MCP Server
by correctover

Real-time LLM output verification with 6-dim contract validation and auto-failover across providers.

local only
NASA Earthdata MCP
by nasa

Discover, verify, and access NASA Earth science datasets via the Common Metadata Repository (CMR)

7 tools answering
Skim MCP
by helloderekg

Lossless skim-then-expand reading of big files, repos, and command output with far fewer tokens

125 installs/wk local only
droplinked
by droplinked-mcp

Agentic commerce + trust MCP: discover, verify, and transact across droplinked's merchant network.

38 tools answering
MCP Output Firewall
by tangfei7777-cell

Three-layer firewall for MCP: content, egress and action policy. Proxy or server.

17 installs/wk local only

Ouroboros — questions

Answers built from our own checks of this server.

Why is there no uptime for Ouroboros?
Ouroboros runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the pypi package ouroboros-ai was installed 38 424 times last week.
How do I connect Ouroboros?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls ouroboros-ai straight from pypi; nothing to host, nothing to sign up for.
How many people use Ouroboros?
The pypi package ouroboros-ai was installed 38 424 times in the last week. Week over week that is +18%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is Ouroboros open source?
Yes — it is published under the MIT licence, written in Python, 6 270 stars on GitHub and 74 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.