split proxy + MCP-over-ACP RFDs #364
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Extract MCP transport mechanism from proxy-chains RFD into standalone mcp-over-acp.mdx. This separation reflects that MCP-over-ACP is useful for any ACP component, not just proxies. New mcp-over-acp.mdx covers: - ACP as MCP transport type (transport: acp with UUID) - Capability advertising via mcpCapabilities.acp - mcp/connect, mcp/message, mcp/disconnect protocol - Bridging for agents without native support proxy-chains.mdx now references mcp-over-acp for MCP-specific details and focuses on the proxy architecture and conductor design.
- Rewrite status quo to clarify ACP/MCP relationship (front/behind framing) - Add capability advertisement flow to 'How it works' section - Add 'Bridging and compatibility' subsection early in the doc - Rename uuid field to id (no format restriction) - Rename acpUrl to acpId (simpler, no acp: prefix) - Link mcpCapabilities to schema docs
- Rename to 'Agent Extensions via ACP Proxies' - Lead with agent extensions concept, proxies as mechanism - Tighten status quo section (~50% shorter) - Move MCP-over-ACP content to FAQ with bridging explanation
- Add diagrams showing proxy chain structure and conductor abstraction - Define terminal vs non-terminal roles upfront - Explain conductor's role and reference canonical Rust implementation - Minor wording improvements throughout
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codefromthecrypt
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codefromthecrypt
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this is interesting work. I will share it with the transports interest group in MCP since this is about adding a new transport and has overlap with other routine things like the wasm question.
one nit is maybe we should rename the proxy-chain doc as well?
(this isn't a full review, just a note as I looked at this briefly)
benbrandt
approved these changes
Jan 8, 2026
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This splits out the proxy support from MCP-over-ACP, as they are conceptually distinct, and produces two independent RFDs.