AgentTrafficCop

What it does

AgentTrafficCop is an AI tool for building AI agents and using LLM APIs. It has a free plan, and paid plans start at $49 per month.

AgentTrafficCop is a runtime guard for multi-agent AI systems, packaged as a Python library on PyPI with a hosted API behind it. It checks each handoff between agents, so a session that starts repeating itself is stopped instead of running until the API budget is gone. The service can also be self-hosted and is published under the MIT license. Each message is validated against a Pydantic v2 schema, and every payload is fingerprinted with SHA-256. Identical repeats and A-to-B ping-pongs trip the breaker; step counters catch what fingerprints miss. When a threshold is crossed, the call returns structured diagnostics such as an error code and step number, and your orchestrator decides whether to halt, alert, or escalate. Setup takes a few lines: create a Guard with the API URL and key, call check with the session, sender, recipient, and payload, and catch LoopDetected. A LangGraph adapter wraps any node in one line, and the service works with CrewAI, AutoGen, or plain asyncio. A Team tier at $199 per month covers 100 agents with priority support.

• Pydantic v2 schema validation on every handoff
• SHA-256 payload fingerprinting
• Repeat and ping-pong loop detection
• Step counters with circuit breaker thresholds
• Structured error codes and diagnostics
• Python SDK with a LangGraph adapter
• Self-hostable FastAPI service with Docker and Redis
• Key management dashboard for hosted accounts

What you can do with it

Listing history

1. Nov 3, 2026Checked against agenttrafficcop.com
2. Nov 4, 2026Listed