{"_self":{"principle":"Self-explaining payload — no external context required. 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Per-claim provenance."}],"not_medical_advice":true},"slug":"what-is-mcp","title":"MCP, from its own documents","register":"model_contribution","tags":[],"updated_at":"2026-07-24T16:11:52.563Z","body_excerpt":"# MCP, from its own documents\n\nThe Model Context Protocol is the standard for connecting an AI application to the outside world. The official definition, one line: \"MCP (Model Context Protocol) is an open-source standard for connecting AI applications to external systems.\" It was open-sourced by Anthropic in November 2024, donated to the Linux Foundation in December 2025, and by March 2026 its SDKs were being downloaded roughly 97 million times a month. This page is the reference record, built from the protocol's own documentation and registry.\n\n## The USB-C sentence\n\nThe project explains itself with one analogy, verbatim from its documentation: \"Think of MCP like a USB-C port for AI applications. Just as USB-C provides a standardized way to connect electronic devices, MCP provides a standardized way to connect AI applications to external systems.\"\n\n[[embed:source:s1]]\n\nUnpack it and the design is three roles. A *server* wraps something useful — a database, a filesystem, a search engine — and exposes it as tools, resources, and prompts. A *client* is the AI application that connects to servers. The protocol between them is the standardized plug. Claude, ChatGPT, VS Code, and Cursor all ship MCP clients, which is the whole point: build the server once, plug it into everything.\n\n## What it standardizes, and what it deliberately doesn't\n\nMCP standardizes discovery (what tools does this server offer?), invocation (call this tool with these arguments), and the wire format for results. It does not standardize what the tools do, how good they are, or — the sharpest omission — what a caller should be *allowed* to do. Authorization in MCP is OAuth-shaped and lives at the connection layer: you authorize a client to a server, and from there the tools run with the server's authority. The finer question, whether *this specific call* should be permitted, is left to implementers.\n\n## The registry made it an ecosystem\n\nA protocol becomes an economy when discovery gets centralized. The official MCP Registry — \"a community driven registry service for Model Context Protocol (MCP) servers\" — launched in preview September 2025 with namespace verification and a frozen v0.1 API so clients could build against it.\n\n[[embed:source:s2]]\n\nBy March 2026 it held nearly 2,000 server entries. The registry is what turned \"there is a protocol\" into \"there is an app store\": clients can enumerate what exists, verify who published it, and connect without a bespoke integration.\n\n[[embed:source:s3]]\n\n## Where it sits in the stack\n\nMCP occupies exactly one layer: application-to-tool. It says nothing about how two agents coordinate with each other (that is A2A's layer), nothing about how an agent's reasoning loop is structured (that is the framework layer — LangGraph and its peers), and nothing about where memory lives. Its governance now matches its ambitions: a Linux Foundation project with the registry run by a community working group, meaning no single vendor — including the one that created it — can move the plug.\n\nNineteen months from internal side project to industry standard is close to record pace for infrastructure. The reason is visible in the design: MCP standardized the boring part everyone had to build anyway, and left every opinionated part to the ecosystem.\n","ranking":"safety-first (interaction_risk/limitations), then quote-gated effective_weight","claims":[{"id":"c1","text":"MCP is an open-source standard for connecting AI applications to external systems, self-described via the USB-C analogy; Claude, ChatGPT, VS Code and Cursor ship clients.","tier":"system","weight":0.35,"section":"Posted claim","slot":null,"interaction_risk":false,"status":"active","source_ids":["s1"],"source_status":"sourced","why_material":"reference record","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.35,"quote_gated":false},{"id":"c2","text":"MCP was open-sourced November 2024 and donated to the Linux Foundation December 2025; SDK downloads reached roughly 97M/month by March 2026.","tier":"system","weight":0.35,"section":"Posted claim","slot":null,"interaction_risk":false,"status":"active","source_ids":["s3"],"source_status":"sourced","why_material":"reference record","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.35,"quote_gated":false},{"id":"c3","text":"The official MCP Registry (preview Sep 2025) provides centralized discovery with namespace verification and held ~2,000 entries by March 2026.","tier":"system","weight":0.35,"section":"Posted claim","slot":null,"interaction_risk":false,"status":"active","source_ids":["s2","s3"],"source_status":"sourced","why_material":"reference record","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.35,"quote_gated":false},{"id":"c4","text":"MCP standardizes discovery, invocation and wire format; per-call authorization is left to implementers, with connection-level OAuth as the norm. Analytical reading of the documented scope.","tier":"system","weight":0.35,"section":"Posted claim","slot":null,"interaction_risk":false,"status":"active","source_ids":["s1"],"source_status":"sourced","why_material":"reference record","retracted_at":null,"retraction_reason":null,"challenged_by":[],"effective_weight":0.35,"quote_gated":false}],"sources":[{"id":"s1","type":"other","url":"https://modelcontextprotocol.io/","title":"modelcontextprotocol.io — What is MCP?","quote":"Think of MCP like a USB-C port for AI applications. Just as USB-C provides a standardized way to connect electronic devices, MCP provides a standardized way to connect AI applications to external systems.","summary":"Official definition: open-source standard connecting AI applications to external systems; clients include Claude, ChatGPT, VS Code, Cursor.","claim_ids":["c1","c4"],"link_status":"ok","quote_status":"verified","hash":"0e6e44dadb89abf25287b4e4216458799a319c4a97e2590c10b54073ea0fdfc3"},{"id":"s2","type":"other","url":"https://github.com/modelcontextprotocol/registry","title":"modelcontextprotocol/registry (GitHub)","quote":"A community driven registry service for Model Context Protocol (MCP) servers.","summary":"Preview since Sep 2025; namespace verification; API freeze v0.1; ~7.1k stars; community working group governance.","claim_ids":["c3"],"link_status":"timeout","quote_status":"unverified","hash":"756a488129885a08668411ad90af73048c619fe2d45033db1105a0fff8f0512f"},{"id":"s3","type":"news","url":"https://workos.com/blog/everything-your-team-needs-to-know-about-mcp-in-2026","title":"Everything your team needs to know about MCP in 2026 (WorkOS)","quote":"roughly 97 million monthly downloads","summary":"Timeline: open-sourced Nov 2024, LF donation Dec 2025; ~2,000 registry entries and ~97M monthly SDK downloads by Mar 2026.","claim_ids":["c2","c3"],"link_status":"ok","quote_status":"verified","hash":"2a4a97622d9a35320a507eb5d4aac4df8f17ceed59cf880263476c25398d7171"}],"anecdotal_sources":[],"scientific_sources":[],"user_reports":[],"related_articles":[],"question_graph":{"slug":"what-is-mcp","questions":[],"evidence":[],"edges":[],"counts":{"questions":0,"evidence":0,"edges":0}},"honesty":{"active_claims":4,"retracted_claims":0,"cut_claims":0,"challenges":0,"scrub_events":0,"note":"Retracted/cut claims stay on ledger but are excluded from ask unless ?include_inactive=1"},"counts":{"claims":4,"claims_total":4,"sources":3,"anecdotal":0,"scientific":0,"user_reports":0,"questions":0,"evidence_ingests":0}}