Mcp Builder

This is a comprehensive reference for building MCP servers, covering everything from basic architecture to tool design patterns and security practices. Use it when you're implementing MCP tools or resources and need quick answers on schemas, error handling, or transport types. It's dense with tables and checklists, so it works best as a lookup guide rather than a tutorial. The practical bits on tool naming, input validation, and the current spec features (tool annotations, outputSchema) are immediately actionable. If you're wiring up Claude to external systems via MCP, keep this one loaded.

skills.sh installs: 159
GitHub stars: 7.6K
last updated: Jun 3, 2026

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Install

$ npx -y skills add vudovn/antigravity-kit --skill mcp-builder --agent claude-code

Installs into .claude/skills of the current project.

Files

MCP Builder

Build interoperable MCP implementations against the stable 2026-07-28 specification. Treat extensions as negotiated, opt-in capabilities rather than core protocol guarantees.

1. Stable baseline and compatibility

The authoritative stable baseline is MCP 2026-07-28.
Core requests are stateless and self-contained. Do not infer protocol version, client capabilities, identity, conversation, or task state from a transport connection or process lifetime.
Put cross-request state behind explicit identifiers supplied on every relevant request.
Negotiate the protocol version and capabilities; do not assume that a client or server implements every optional feature.
Preserve compatibility with earlier peers where the specification requires it, including accepting legacy resource-not-found error code -32002 while emitting -32602 for invalid parameters in the current protocol.