MCP Multiagent Bridge

Production-ready Python MCP server for secure multi-agent coordination with comprehensive safeguards.

Overview

Enables multiple LLM agents (Claude, Codex, GPT, etc.) to collaborate safely through the Model Context Protocol without sharing workspaces or credentials. Built with security-first architecture and production-grade safeguards.

Use cases:

• Backend agent coordinating with frontend agent on different codebases

• Security review agent validating changes from development agent

• Specialized agents collaborating on complex multi-step workflows

• Any scenario requiring isolated agents to communicate securely

Key Features

🔒 Security Architecture

Authentication & Authorization:

• HMAC-SHA256 session token authentication

• Automatic secret redaction (API keys, passwords, tokens, private keys)

• 3-hour session expiration with automatic cleanup

• SQLite WAL mode for atomic, race-condition-free operations

4-Stage YOLO Guard™: Command execution (optional) requires multiple confirmation layers:

1. Environment gate - explicit YOLO_MODE=1 opt-in

2. Interactive typed confirmation phrase

3. One-time validation code (prevents automation)

4. Time-limited approval tokens (5-minute TTL, single-use)

Rate Limiting:

• Token bucket algorithm with configurable windows

• Default: 10 requests/minute, 100/hour, 500/day

• Per-session tracking with automatic reset

• Prevents abuse while allowing legitimate bursts

Audit Trail:

• Comprehensive JSONL logging of all operations

• Timestamps, session IDs, actions, results

• Tamper-evident sequential logging

• Supports compliance and forensic analysis

🏗️ Production-Ready Architecture

• Message-only bridge - No auto-execution, returns proposals only

• Schema validation - Strict JSON schemas for all MCP tools

• Command validation - Configurable whitelist/blacklist patterns

• Comprehensive error handling - Graceful degradation, informative errors

• Extensible design - Plugin architecture for future backends

📦 Platform Support

Works with any MCP-compatible LLM:

• Claude Code, Claude Desktop, Claude API

• OpenAI models (via MCP adapters)

• Anthropic API models

• Custom/future models (not tied to specific backend)

Installation

Full setup: See QUICKSTART.md

Documentation

Getting Started:

• QUICKSTART.md - 5-minute setup guide

• EXAMPLE_WORKFLOW.md - Real-world collaboration scenarios

• PRODUCTION.md - Production deployment & test results ⭐ NEW

Production Hardening:

• scripts/production/README.md - Keep-alive daemons, watchdog, task reassignment ⭐ NEW

• PRODUCTION.md - Complete test results with IF.TTT citations

Security & Compliance:

• SECURITY.md - Threat model, responsible disclosure policy

• YOLO_MODE.md - Command execution safety guide

• Policy compliance: Anthropic AUP, OpenAI Usage Policies

Contributing:

• CONTRIBUTING.md - Development setup, PR workflow

• LICENSE - MIT License

Technical Stack

• Python 3.11+ - Modern Python with type hints

• SQLite - Atomic operations with WAL mode

• MCP Protocol - Model Context Protocol integration

• pytest - Comprehensive test suite

• CI/CD - GitHub Actions (tests, security scanning, linting)

Project Statistics

• Lines of Code: ~6,700 (including tests, production scripts + documentation)

• Test Coverage: ✅ Core security validated (482 operations, zero failures)

• Documentation: 3,500+ lines across 11 markdown files

• Dependencies: 1 (mcp>=1.0.0, pinned for reproducibility)

• License: MIT

Production Test Results (November 2025)

10-Agent Stress Test:

• ✅ 1.7ms average latency (58x better than 100ms target)

• ✅ 100% message delivery (zero failures)

• ✅ 482 concurrent operations (zero race conditions)

• ✅ Perfect data integrity (SQLite WAL validated)

9-Agent S² Production Hardening:

• ✅ 90-minute test (idle recovery, keep-alive, watchdog)

• ✅ <5 min task reassignment (automated worker failure recovery)

• ✅ 100% keep-alive delivery (30-minute validation)

• ✅ <50ms push notifications (filesystem watcher, 428x faster than polling)

Full Report: See PRODUCTION.md

Development

See CONTRIBUTING.md for complete development workflow.

Production Status

✅ Production-Ready (Validated November 2025)

Successfully tested with:

• ✅ 10-agent stress test (94 seconds, 100% reliability)

• ✅ 9-agent production deployment (90 minutes, full hardening)

• ✅ 1.7ms average latency (58x better than target)

• ✅ Zero data corruption in 482 concurrent operations

• ✅ Automated recovery from worker failures (<5 min)

Recommended for:

• Production multi-agent coordination

• Development and testing workflows

• Isolated workspaces (recommended)

• Human-supervised operations

• 24/7 autonomous agent systems (with production scripts)

Production deployment:

• See PRODUCTION.md for complete deployment guide

• Use scripts/production/ for keep-alive, watchdog, and task reassignment

• Follow SECURITY.md security best practices

Support

• Issues: GitHub Issues

• Discussions: GitHub Discussions

• Security: See SECURITY.md for responsible disclosure

License

MIT License - Copyright © 2025 Danny Stocker

See LICENSE for full terms.

Acknowledgments

Built with Claude Code and Model Context Protocol.