Fable Mode MCP Server

by rex-codebase Your server? Claim it

local only

Fable Mode runs on your own machine — the client starts it, so there is no endpoint to ping. Last commit 18 Sep 2026.

Mechanical write gates, evidence receipts, and adversarial review for AI coding agents.

—

Installs / week

pypi · fable-engine

Stars

2 open issues

18 Sep 2026

Last commit

no recent releases

MIT

License

Python

What the code does

We read the source, 18 h ago · rules 3dff92dd89df

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

Runs an external command fable_mode/adapters.py:123, fable_mode/launcher.py:140, fable_v2/coder_fleet/receipt_attestor.py:45 и ещё 9

        proc = subprocess.Popen(argv, **kwargs)

Executes code built at runtime fable_v2/coder_fleet/sandbox_executor.py:267, [пакет] fable_v2/coder_fleet/sandbox_executor.py:267

        exec(compile(str(init.get("source", "")), "<fable-sandbox-target>", "exec"), namespace)

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.

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.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add fable-mode -- uvx fable-engine

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "fable-mode": {
      "args": [
        "fable-engine"
      ],
      "command": "uvx"
    }
  }
}

~/.codex/config.toml

[mcp_servers.fable-mode]
command = "uvx"
args = ["fable-engine"]

.cursor/mcp.json

{
  "mcpServers": {
    "fable-mode": {
      "args": [
        "fable-engine"
      ],
      "command": "uvx"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "fable-mode": {
      "args": [
        "fable-engine"
      ],
      "command": "uvx"
    }
  }
}

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Fable Mode — questions

Answers built from our own checks of this server.

Why is there no uptime for Fable Mode?

Fable Mode 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 fable-engine.

How do I connect Fable Mode?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls fable-engine straight from pypi; nothing to host, nothing to sign up for.

Is Fable Mode open source?

Yes — it is published under the MIT licence, written in Python, 24 stars on GitHub and 2 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.