v0.1.0 · available on PyPI

Stop your AI agents from
burning money in loops.

A runtime circuit breaker for multi-agent systems. Sits between your agents, validates every handoff, fingerprints every payload, and trips before $400 becomes $4,000.

View source ↗ See the demo →

python demo.py bash

$ 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 ──────────────────────────────────────────── 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 ✓ saved vs run 1: $0.07

01 — Features

Three things, sitting
between your agents.

Schema shield

Every handoff validated against a strict Pydantic contract. Malformed payloads get a structured 422 before they reach the next agent.

Loop detection

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

Runtime breaker

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

02 — Integrate

Five lines to add it
to your orchestrator.

        your_orchestrator.py
        Python
      
from agenttrafficcop import Guard, LoopDetected

guard = Guard(url="http://localhost:8000", 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)

Works with LangGraph, CrewAI, AutoGen, or raw asyncio. Runs as a standalone service.

04 — Pricing

Free to start.
Scale when you need to.

The middleware and SDK are open source. The managed service is coming soon.

Free

forever

10,000 messages / month
Single instance
Self-hosted
Community support

Get started

Pro

Recommended

$49/mo

coming soon

250,000 messages / month
Multi-instance
30-day audit log
Email support

Join waitlist

Team

$199/mo

coming soon

2M messages / month
1-year audit log
Priority support
Slack Connect

Contact

Enterprise

Custom

talk to us

Unlimited messages
SSO / SAML
On-prem or VPC
DPA, BAA

Contact

Stop your AI agents from
burning money in loops.

Three things, sitting
between your agents.

Schema shield

Loop detection

Runtime 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 your AI agents from burning money in loops.

Three things, sitting between your agents.

Schema shield

Loop detection

Runtime 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 your AI agents from
burning money in loops.

Three things, sitting
between your agents.

Five lines to add it
to your orchestrator.

Tested, observable,
hardened.

Free to start.
Scale when you need to.