Developer launches Vexyo, an open-source conformance and regression tester for MCP servers

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A developer has released Vexyo, a free, open-source testing harness designed to catch specification violations and behavioral regressions in Model Context Protocol (MCP) servers before they affect AI clients. The tool was born out of repeated debugging sessions where MCP servers appeared healthy in logs but caused subtle misbehavior in connected AI clients. Vexyo runs 16 conformance rules against the MCP spec (version 2025-11-25), covering initialization, discovery, error semantics, and transport, and cites the exact spec section for every finding. It also supports regression testing by recording golden output sets and flagging schema, behavioral, or coverage drift on each commit, integrating natively with CI pipelines via a GitHub Action. The project is licensed under Apache-2.0, works with servers written in any language over stdio or HTTP, and is available at github.com/vexyohq/vexyo.

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