modelcontextprotocol.io is the public MCP spec home

Tool listing and invocation. Payment is still not a core message type.

The public MCP documentation site is the protocol’s human/machine getting-started surface. It describes hosts, clients, servers, tools, resources and prompts. It does not specify settlement.

Why it matters

Paid MCP remains a market category until this spec names a payment profile.

Source: MCP documentation

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