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Build and Test an MCP Server in TypeScript: Zod Schemas, Validation Errors, isError Results and an In-Memory Client

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Self-Hosting & Infra intermediate 8 min read $0.01 Updated 2026-10-20

Run with @modelcontextprotocol/sdk 1.32: registerTool with zod, the generated inputSchema, validation errors as isError results with code -32602, tool failures returned versus thrown, unknown tool errors, and a linked in-memory client and server test harness.

Register tools with the official MCP SDK, see the exact JSON schema it publishes, observe how bad arguments, thrown exceptions and unknown tools are reported, and test everything in-process without spawning a server.

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