mcp-works

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mcp-worksTest your MCP servers like real software.

Mock, contract-test, validate and guard MCP tool servers. Zero runtime deps.

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API Reference
npm

Mock in 2 lines

In-process mock server. No live server in tests, latency simulation, AbortSignal support.

Contract + args

contractTest catches shape errors; validateArgs checks values — required, types, constraints, zero-dep.

Guard in prod

Allowlist, timeout, output cap, PII redact. Typed McpWorksError codes for retries.