Soak-testing MCP servers before AI agents connect

On October 3, 2026, the AI section of DEV Community published an article on how to soak-test an MCP server before it goes in front of an AI agent. The piece opens with a pattern its author treats as the norm: most MCP servers get tested the same way — someone connects a single client, calls a few tools by hand, and ships it. The trouble starts later, when real agents show up. Dozens of sessions arrive at once, three tool calls run in parallel, and sessions never get closed.

What follows, according to the article, does not look like a crash. Instead the failures are slow and easy to miss: memory that creeps up over a period of hours, a p95 latency that slowly doubles, and Session not found errors that appear only once two replicas are running behind a load balancer. Each of these shows up under conditions a single hand-driven client never creates, which is why a server can look healthy during manual checks and still fall over in production.

The article's stated purpose is to let teams reproduce these failure modes locally, so that the problems surface during soak testing rather than after an agent is connected. That is where the available material ends: it frames the issue as pre-integration validation for MCP servers and names the three failure shapes, while the excerpt does not lay out the specific reproduction steps or tooling used.