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MCP as substrate protocol

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@@ -12,13 +12,13 @@ last_edited: 2026-05-15
editor: pointsav-engineering
cites: []
references:
  - id: 1
    text: "Anthropic. 'Model Context Protocol Specification.' modelcontextprotocol.io, 2025."
    url: "https://modelcontextprotocol.io/specification/2025-11-25"
 - id: 1
 text: "Anthropic. 'Model Context Protocol Specification.' modelcontextprotocol.io, 2025."
 url: "https://modelcontextprotocol.io/specification/2025-11-25"
paired_with: mcp-substrate-protocol.es.md
---

**MCP-as-Substrate-Protocol** designates the Model Context Protocol (MCP) as the wire contract for all inter-service composition in the Foundry platform. Every Ring 1 and Ring 2 service exposes an MCP server interface as its primary external contract. The Doorman (`service-slm`) is the MCP gateway. Customer extensions plug in as additional MCP servers. This is not a preference or an implementation convenience — it is a structural decision encoded in Doctrine claim #46.
**MCP-as-Substrate-Protocol** designates the Model Context Protocol (MCP) as the wire contract for all inter-service composition in the Foundry platform. Every Ring 1 and Ring 2 service exposes an MCP server interface as its primary external contract. The Doorman (`service-slm`) is the MCP gateway. Customer extensions plug in as additional MCP servers. This is not a preference or an implementation convenience — it is a structural decision.

## Why MCP is substrate-level
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