About mcp-assert
mcp-assert is a command-line tool for testing the correctness of Model Context Protocol servers. It connects to a server over standard input/output, SSE, or HTTP, calls its tools, and checks the results against assertions defined in YAML. These assertions can be run in continuous-integration workflows, helping teams verify that tool behavior remains consistent as a server changes. The product is distributed as a single Go binary and can test servers written in any language that speaks MCP, with Go, TypeScript, Python, Rust, and Java listed as examples. This makes the test runner independent of the implementation language of the server. Its purpose is deterministic correctness checking rather than generating server code or providing a client interface for end users. mcp-assert is suited to developers maintaining MCP tools who need repeatable checks in local or CI workflows. The evidence does not detail the assertion syntax or the full protocol behaviors tested. It establishes transport options, YAML-defined assertions, and cross-language server compatibility.
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