Simulating Cloud Architecture Over MCP Before Deployment Using a Traffic Spike Test

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A developer built Cloud World Model, a hosted simulator that AI assistants can call over the MCP protocol to test infrastructure changes before deployment. The write-up walks through a test of a small AWS stack with an internal load balancer, two m5.large application servers, and a db.r5.large MySQL 8.0 database in us-east-2. At a baseline of 200 requests per second, the simulation reported 0% errors, a p95 latency of 15.01 ms, and app CPU near 10% per node. When traffic was spiked to 600 requests per second, p95 latency rose to 38 ms, error rate reached 10%, and each app node hit 100% CPU, while the database remained at roughly 18.5% CPU. The author notes that baseline numbers are fit to the author's own k6 load tests, and that keyless simulations are temporary demos with resource and step limits.

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