Problems / AI systems, hard
Agents call MCP tools 10 times per task. A 1% tool error rate becomes a 10% task failure rate.
Free to open. Runs in your browser, no sign-up.
Success ≥ 95%, p99 ≤ 60 s.
4 requests a second for 60 seconds: 100% task (writes).
What each component does in this design, and what calls it. The simulator mimics each one from these settings.
| Component | Its job here | Settings |
|---|---|---|
| Load balancerLoad balancer | Traffic enters here.Calls Agent API.Layer 4 balancers route by IP and port; layer 7 balancers read HTTP and can route by path or header. | – |
| Agent APIApp service | Load balancer forwards to it.Calls Agent orchestrator, S3 (task results).Little's law: throughput ≈ concurrency ÷ latency. 200 slots at 50 ms serve about 4,000 req/s. | 2 replicas × 400 slots · timeout 120 s |
| Agent orchestratorAgent orchestrator | Agent API calls it.Calls Agent memory (vector), Model, MCP gateway (auth, tool registry).An agent loops: think, call a tool, read the result, repeat until done. | 300 slots · 10 steps |
| ModelLLM endpoint | Agent orchestrator calls it.Latency has two parts: time to the first token, then a steady stream of tokens per second. | 200 streams · 1,200 calls/min |
| MCP gateway (auth, tool registry)MCP gateway | Agent orchestrator calls it.Calls MCP tool servers.MCP (Model Context Protocol) is an open standard for connecting models to tools and data. | 500 slots · 30,000 calls/min |
| MCP tool serversTool / MCP server | MCP gateway (auth, tool registry) calls it.Tools give the model actions such as search or database queries; each call is another round trip. | 40 slots |
| Agent memory (vector)Agent memory store | Agent orchestrator calls it.Agent memory keeps facts across sessions so the agent does not start from scratch. | 500 slots |
| S3 (task results)Object storage | Agent API calls it.Object stores like S3 keep copies across devices and facilities for very high durability. | 5000 slots · 300,000 calls/min |
Try it first. Open one hint at a time if you get stuck.
1 − 0.99¹⁰ ≈ 10%.
Fewer steps, fewer chances to fail.
Cap the agent’s steps.