v1.0.0 · now available on PyPI

Stop AI agents from burning money in loops.

AgentTrafficCop is a runtime circuit breaker for multi-agent systems. It validates every handoff, fingerprints every payload, and trips before a loop empties your API budget.

Generate Free API Key ↗

No credit card required 5 Agents free 213 tests passing

python demo.py

$ python demo.py ────────────────────────────────────────────── RUN 1 · WITHOUT AgentTrafficCop ────────────────────────────────────────────── coder → reviewer {diff: 'rename foo to bar'} reviewer → coder {feedback: 'add a docstring'} coder → reviewer {diff: 'add null check'} reviewer → coder {feedback: 'handle empty case'} ... 20 more rounds ... ✗ no breaker · 24 messages · cost: $0.10 (illustrative) ────────────────────────────────────────────── RUN 2 · WITH AgentTrafficCop ────────────────────────────────────────────── coder → reviewer {...} ✓ step=1 reviewer → coder {...} ✓ step=2 coder → reviewer {...} ✓ step=3 reviewer → coder {...} ✗ CYCLIC_PAYLOAD_LOOP 🛑 CIRCUIT BREAKER TRIPPED error_code : CYCLIC_PAYLOAD_LOOP session : demo-loop step : 8 ✓ session halted · 8 messages · cost: $0.03 (illustrative) ✓ saved vs run 1: $0.07

01 — Features

Three primitives,
sitting between your agents.

Schema shield

Every handoff validated against a strict Pydantic v2 contract before it reaches the next agent. Malformed payloads are rejected at the door.

Loop detection

SHA-256 fingerprinting on every payload. Identical repeats and A↔B ping-pongs trip the breaker. Step counters catch the rest.

Circuit breaker

When thresholds breach, the response carries structured diagnostics. Your orchestrator decides: halt, alert, or escalate.

02 — How it works

Five lines to add it
to your orchestrator.

        your_orchestrator.py
        
      
from agenttrafficcop import Guard, LoopDetected

guard = Guard(url="https://YOUR-RENDER-URL.onrender.com", api_key="your-key")

try:
    result = await guard.check(
        session_id="run-42",
        sender="coder",
        recipient="reviewer",
        payload={"diff": "fix typo"},
    )
    print("approved at step", result.step)
except LoopDetected as e:
    print("loop caught:", e.error_code)

Runs as a standalone FastAPI service. Works with LangGraph, CrewAI, AutoGen, or raw asyncio. The SDK ships a LangGraph adapter — wrap any node in one line.

04 — Pricing

Free to start.
Scale when you need to.

The middleware and SDK are open source and self-hostable today. Managed tiers are coming soon.

Free

forever

Protect up to 5 agents
10,000 messages / month
60 requests / minute
Hosted Cloud

Get started

Recommended

Pro

$49/mo

coming soon

Protect up to 25 agents
250,000 messages / month
120 requests / minute
Usage analytics + Email support

Upgrade

Team

$199/mo

coming soon

Protect up to 100 agents
2,000,000 messages / month
300 requests / minute
Priority support

Upgrade

Stop AI agents from burning money in loops.

Three primitives,
sitting between your agents.

Schema shield

Loop detection

Circuit breaker

Five lines to add it
to your orchestrator.

Tested, observable,
hardened.

Free to start.
Scale when you need to.

Try it in sixty seconds.

Stop AI agents from burning money in loops.

Three primitives, sitting between your agents.

Schema shield

Loop detection

Circuit breaker

Five lines to add it to your orchestrator.

Tested, observable, hardened.

Free to start. Scale when you need to.

Try it in sixty seconds.

Three primitives,
sitting between your agents.

Five lines to add it
to your orchestrator.

Tested, observable,
hardened.

Free to start.
Scale when you need to.