All Things MCP
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MCP specification coverage now tracks version and verification dates.

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MCP ecosystem diagram connecting hosts, clients, servers, tools, prompts, and resources around a secure protocol core.

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Popular guides

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Build a minimal MCP server

Create and inspect a focused server in small steps.

4 steps · 55 min · Beginner

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What is MCP?

A practical mental model for the protocol and where it fits.

Concepts · 10 min

MCP architecture

Hosts, clients, servers, sessions, and primitives in context.

Architecture · 18 min

MCP in production

What changes when identities, networks, and failures become real.

Production · 22 min

Latest from Spec Watch

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Tracked revisionStable

MCP Protocol Revision 2025-11-25

Review the changes that affect authorization, schemas, elicitation, metadata, and polling behavior.

  • What changed
  • Why it matters
  • What implementers should review
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