MCP
Model Context Protocol. A convention for exposing tools and data to assistants.
What MCP does not show
Publishing an MCP endpoint is a capability, not a visibility measure.
Where MCP comes up on this site
- How to check an MCP server before an AI agent connects to itOn 7 October 2026 CrawlCheck read every remote endpoint in the official MCP Registry, 25,983 of them: 15,575 returned tool lists carrying 288,806 tools, and eleven servers carried tool text addressed to the model rather than the user .
- 25,983 MCP endpoints from the registry: what they answer, and the eleven whose tools talk to the modelThe official MCP Registry is where agents and their builders go to find servers.
- MCP servers that ask for a login: what 1,366 request firstAn agent that connects to an MCP server on someone’s behalf usually has to log in, and the login decides what the agent can do afterwards.
- Agent readiness checkers: Is It Agent Ready? vs CrawlCheckThe access layer comes first An agent that is refused never reaches your MCP card.
- The agentic web for site owners: permission, delivery, identity and toolsTools Sites and services now expose tools to agents directly through MCP servers.
Definitions that name MCP
MCP server · MCP client · MCP host · MCP tool · MCP transport · JSON-RPC · tool poisoning · tool lockfile · tool shadowing · MCP preflight · high-risk field · protected-resource metadata · PKCE
Related terms in Machine files
The files addressed to machines rather than readers, and what publishing one does and does not buy.
llms.txt · llms-full.txt · agents.md · entity map · entity map parity · machine layer · well-known URI · agent card · sitemap index · OpenAPI specification · ai.txt · Tool definition · SKILL.md · sitemap origin error · soft 404 on a machine file · tdmrep.json · TDM exception · security.txt · Content Signals · HTTP Message Signatures · changefreq and priority · staging leak · host duplicate
Questions about MCP
What is MCP?
Model Context Protocol. A convention for exposing tools and data to assistants.
What does MCP not show or guarantee?
Publishing an MCP endpoint is a capability, not a visibility measure.
Which area of the glossary does MCP belong to?
Machine files: The files addressed to machines rather than readers, and what publishing one does and does not buy.
← well-known URI · agent card →
See it in the full glossary · 731 terms across 19 areas.