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MCP in Practice (2026-07-28 Spec)
The Model Context Protocol went stateless in the 2026-07-28 revision. This guide covers the architecture, the three server primitives, both transports, authorization, a small working server, the security model, production operations, and when not to use MCP at all.
Designing Tools for Agents: The Agent-Computer Interface
Tool definitions are the interface an agent actually programs against. This guide covers which tools to build, how to name and describe them, parameter design that prevents bad calls, response shaping, actionable errors, safe repeats, and how to evaluate a tool surface.