AiMatch

AgentTrafficCop

AgentTrafficCop checks handoffs in multi-agent systems, rejecting malformed payloads and stopping detected loops. Python developers use it to add runtime controls to agent orchestrators.

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AgentTrafficCop screenshot

Who it's for

  • Python developers building multi-agent orchestrators who need to validate messages between agents.
  • Teams using LangGraph, CrewAI, or AutoGen that want runtime loop detection for agent handoffs.
  • Developers using raw asyncio who want to add a Guard check between agents.

Not the right fit if…

  • Teams running Python earlier than 3.11: the page lists Python 3.11+.

How it fits your workflow

Install the Python package and create a Guard with the AgentTrafficCop service URL and an API key. The page also says the middleware and SDK can be self-hosted.

Call `guard.check` with a session ID, sender, recipient, and payload before passing a handoff to the next agent. AgentTrafficCop validates the payload and checks for repeats, ping-pongs, and step thresholds.

If a loop is detected, handle the `LoopDetected` exception and its error code. The page says the orchestrator can halt, alert, or escalate.

Pricing

Free: Free forever, with up to 5 agents, 10,000 messages per month, and 60 requests per minute.

Free

$0 forever

  • · Protect up to 5 agents
  • · 10,000 messages per month
  • · 60 requests per minute

Pro

$49/month; coming soon

  • · Protect up to 25 agents
  • · 250,000 messages per month
  • · 120 requests per minute
  • · Usage analytics

Team

$199/month; coming soon

  • · Protect up to 100 agents
  • · 2,000,000 messages per month
  • · 300 requests per minute
  • · Priority support

Prices checked on Nov 3, 2026 from the vendor's site. They can change; confirm before you buy.

Key features

Schema shield
Validates every agent handoff against a strict Pydantic v2 contract and rejects malformed payloads before they reach the next agent.
Loop detection
Uses SHA-256 payload fingerprinting to detect identical repeats and A↔B ping-pongs. Step counters are also used to catch loops.
Circuit breaker with diagnostics
Trips when thresholds are breached and returns structured diagnostics, leaving the orchestrator to decide whether to halt, alert, or escalate.
Python SDK and LangGraph adapter
The SDK provides a Guard that checks a handoff using a session ID, sender, recipient, and payload. A LangGraph adapter can wrap a node.
Pluggable session store
The page lists Redis or memory as session-store options.

Works with

  • LangGraph
  • CrewAI
  • AutoGen
  • Redis

Limitations to know

  • The free plan is limited to 5 agents, 10,000 messages per month, and 60 requests per minute.
  • The Pro and Team managed tiers are marked as coming soon.
  • Python 3.11+ is listed on the page.

Alternatives to consider

  • AI Circuit Breaker

    Choose it if you want a reverse proxy for OpenAI-compatible agent traffic with hourly and daily spend caps.

  • AgentGuard

    Choose it if you need per-workflow budgets, credential isolation, token metering, or MCP policy enforcement.

Compare AgentTrafficCop side by side

Getting started

pip install agenttrafficcop

Python 3.11+.

  1. Install AgentTrafficCop from PyPI.
  2. Generate a free API key; the page says no credit card is required.
  3. Initialize a Guard with the service URL and API key.
  4. Call `guard.check` for handoffs and handle `LoopDetected`.