REX-codebase/fable-mode

Overview

Open-source MCP control plane for AI coding agents, built in Python. It enforces mechanical time-locks, requires evidence-gated proof receipts, supports red-team remediation, and maintains persistent engineering memory.

Best for

Best for
Developers who want hard guardrails and audit trails on AI coding agents.

Use cases

• Gate agent actions behind time-locks
• Require proof receipts before accepting completions
• Run red-team remediation on agent behavior

How to use

Install

uvx --from fable-engine==1.3.9 fable-mode setup --yes

Tested with

Claude Code, Cursor, VS Code

Notes

Open-source MCP control plane for AI coding agents, built in Python. It enforces mechanical time-locks, requires evidence-gated proof receipts, supports red-team remediation, and maintains persistent engineering memory.

24 stars on GitHub. Last updated 2026-09-18. Licensed MIT.

Use cases

• Gate agent actions behind time-locks
• Require proof receipts before accepting completions
• Run red-team remediation on agent behavior

Pros

• Explicit control mechanisms for agent workflows
• Persistent memory across sessions
• Open-source and auditable

Cons

• Very early-stage project (24 stars)
• Narrow community adoption
• Requires Python environment setup

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.