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AgentTrafficCop
AgentTrafficCop is a runtime circuit breaker middleware that stops AI agents from running infinite loops and high API costs.
AgentTrafficCop is a runtime circuit breaker for multi-agent systems designed to prevent runaway API costs and infinite loops. It operates as a standalone FastAPI service and integrates with LangGraph, CrewAI, AutoGen, or raw asyncio, featuring a dedicated LangGraph adapter. The system validates every agent handoff against a strict Pydantic v2 contract, uses SHA-256 fingerprinting to detect identical repeats and ping-pong loops, and triggers step counters to catch remaining issues. When thresholds breach, it returns structured diagnostics for the orchestrator to handle. The middleware and SDK are open source and self-hostable, with managed tiers available.
AgentTrafficCop at a glance
- Best for: Software engineer
- Runs on: API, self-hosted, open source
- Pricing: Free tier available; Pro tier with 250000 messages per month; Team tier with 2000000 messages per month.
- Released: November 2026
- Category: AI coding tool
- Website: agenttrafficcop.com
Key features
- Schema shield for strict Pydantic v2 contract validation
- SHA-256 payload fingerprinting for loop detection
- Step counters for catching extended loops
- Structured diagnostics on threshold breach
- LangGraph adapter for node wrapping
- Standalone FastAPI service architecture
Use it for
- Prevent infinite loops in multi-agent systems
- Validate handoff payloads against Pydantic contracts
- Control runaway API costs during agent execution
Alternatives to AgentTrafficCop
- Agent Relay — It carries turns between different AI agents and stops for human decisions.
- HarnessRouter — One API to manage agent runtimes, sandboxes, and execution lifecycles.
- APIStack — Connect AI agents to over 100 tools using one API key or a single MCP endpoint.
- LLM Cost Firewall — Catches infinite tool loops and stops budget overruns instantly.
- AgentOps — Track token usage, costs, and traces across 400 plus LLMs and agent frameworks.
- Fluxix — Stops dangerous tool calls and data leaks before execution.
- Agentfork — It replays steps from cache and runs sweeps to provide pass rates instead of anecdotes.
- Agentloop — Provides a clean agent loop with provider-agnostic LLM access, hooks, and safety budgets.
- Aw1 Circuit Breaker — Stops prompt bypasses and dynamic execution attacks in under a millisecond.
- AgentField — Provides an open-source control plane and coding agent stack for production.
- Stop That Shit — Enforces task boundaries to stop unnecessary AI agent actions.
- Agentic Bug Hunter — It drives the reconnaissance, triage and reporting loop an agent would run.
All AgentTrafficCop alternatives