Fable Mode runs on your own machine — the client starts it, so there is no endpoint to ping. 63 installs a week from pypi. Last commit 18 Sep 2026.
Mechanical write gates, evidence receipts, and adversarial review for AI coding agents.
What the code does
We read the source, 3 d ago · rules 995398eba69f
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.
setup.py: выполняет код при установке пакета
proc = subprocess.Popen(argv, **kwargs)
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 mcp add fable-mode -- uvx fable-engine{
"mcpServers": {
"fable-mode": {
"command": "uvx",
"args": [
"fable-engine"
]
}
}
}[mcp_servers.fable-mode]
command = "uvx"
args = ["fable-engine"]{
"mcpServers": {
"fable-mode": {
"command": "uvx",
"args": [
"fable-engine"
]
}
}
}{
"servers": {
"fable-mode": {
"type": "stdio",
"command": "uvx",
"args": [
"fable-engine"
]
}
}
}Alternatives to Fable Mode
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Deterministic release gate for AI-written code and coding agents.
Writes adversarial test suites for AI-built code. Your agent's test engineer.
Hand tasks, bugs and finished work to AI coding agents, and get back a write-up with evidence.
Local code-quality rules, findings, preview-first safe fixes and gate results for coding agents.
Read-only semantic filtering, code search, log triage and traceable evidence for AI agents.
Local QA workflows, test evidence, screenshot maps and confidence reports for AI coding agents.
Project memory for coding agents whose memories carry code evidence, re-checked on every recall.
Fable Mode — questions
Answers built from our own checks of this server.