What problem does it solve?
Building an MCP server that other agents can reliably use is hard because tool discovery, naming, schemas, context handling, pagination, and error messages must all work together for successful end-to-end tasks.
Core Features & Use Cases
- Plan quality MCP tool design: Balance broad API coverage with workflow-oriented tools so agents can complete real tasks efficiently.
- Implement robust tools with correct schemas: Define clear input/output schemas (Zod or Pydantic) and return structured data when supported by the SDK.
- Harden reliability with best practices: Use consistent naming conventions, actionable errors, pagination, and transport guidance (stdio vs streamable HTTP).
- Create evaluations for correctness: Generate stable, read-only evaluation questions to test whether an LLM can use your tools effectively.
Quick Start
Use the mcp-builder skill to create an MCP server that exposes a third-party API as well-named tools with strong schemas and pagination, then verify it by writing an evaluation XML with 10 complex read-only QA pairs.