Ask HN: With Promptfoo acquired by OpenAI, what are MCP devs using for testing?

2 points

3 months ago

With OpenAI's acquisition of Promptfoo last week, I've been thinking about the testing gap for MCP servers specifically. Promptfoo was great for LLM evaluation but didn't handle MCP's transport layer, tool schema validation, or MCP-specific vulnerabilities like Tool Poisoning.

What are people using to test their MCP servers in CI? The MCP Inspector is interactive-only.

I've personally been building MCPSpec [https://light-handle.github.io/mcpspec/] but curious what approaches others are taking custom scripts, unit tests on server internals, something else?

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