feat: migrate coderd MCP server to official MCP Go SDK - #28056
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feat: migrate coderd MCP server to official MCP Go SDK#28056ibetitsmike wants to merge 1 commit into
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Replace mark3labs/mcp-go with modelcontextprotocol/go-sdk v1.7.0 for the /api/experimental/mcp/http endpoint. The server now speaks MCP 2026-07-28 (stateless lifecycle, server/discover, -32022 rejection) while still negotiating down to 2024-11-05 for legacy clients. The endpoint was already effectively stateless (a fresh server per request, format-only session validation), so the SDK's stateless mode changes only spec-permitted surface behavior: no Mcp-Session-Id header and 405 for GET/DELETE. Tool schemas, annotations, and text result content are wire-identical (golden-diffed against the old server). mark3labs remains in go.mod for the not-yet-migrated surfaces and as the legacy test client.
This was referenced Aug 12, 2026
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Stack Context
PR 1 of 6 in a stack that migrates every Coder MCP surface from the archived
github.com/mark3labs/mcp-golibrary to the officialgithub.com/modelcontextprotocol/go-sdkv1.7.0, adding MCP 2026-07-28 support while keeping compatibility with clients speaking 2024-11-05 through 2025-06-18.Stack: #28056 -> #28057 -> #28058 -> #28059 -> #28060 -> #28061
Why
The coderd Streamable HTTP MCP server (
/api/experimental/mcp/http) is the foundation layer: it introduces the official SDK dependency and the sharedRegisterSDKToolhelper the CLI server reuses.JSONResponse: true, preserving the previousapplication/jsonPOST wire format. GET and DELETE return 405, and noMcp-Session-Idis issued, both permitted by the Streamable HTTP spec.DisableLocalhostProtectionis set because coderd commonly listens on loopback behind a reverse proxy with a public Host header; the endpoint's bearer authentication is the relevant access control.required, keepingtools/listoutput byte-identical to the previous server (verified with a golden comparison).cdr.dev/slog/v3; only warnings and errors are forwarded because the SDK logs several INFO lines per stateless request.-32022), and non-POST method behavior.