MCPSpec – Ship reliable MCP servers without writing test code
Hi HN, I've been building MCPSpec, an open-source CLI for MCP server reliability. Record sessions, generate mock servers, catch Tool Poisoning, and fail your CI build when something's wrong — without writing test code. There are ways to validate MCP servers today — the MCP Inspector, ad-hoc SDK scripts, unit tests for server internals — but nothing that handles regression detection, security auditing, mock generation, and CI pass/fail checks in one tool. MCPSpec does that: 1. Record a session against your real server, replay it after changes to catch regressions 2. Generate a standalone…
MCPSpec – Ship reliable MCP servers without writing test code launched on February 25, 2026 with 7 votes, #1,385 of 16,627 launches that month and more than 75% of that year's launches.
What it does
Record sessions, generate mock servers, gate your CI pipeline, and catch Tool Poisoning. The reliability platform for Model Context Protocol servers.
In the maker’s words, at launch
Hi HN, I've been building MCPSpec, an open-source CLI for MCP server reliability. Record sessions, generate mock servers, catch Tool Poisoning, and fail your CI build when something's wrong — without writing test code. There are ways to validate MCP servers today — the MCP Inspector, ad-hoc SDK scripts, unit tests…
Pricing, as stated on its site
Free — MCPSpec is an open-source CLI tool available via npm with no pricing page found. It is distributed under MIT License.
checked September 2026 · prices change
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