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mcp: Implement server-side support for discover method (SEP-2575) (#987)

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## Summary
Part 3 of the SEP-2575 ("Make MCP Stateless") implementation. Builds on
PR #975 which landed the client-side discover/fallback flow and the
per-request `_meta` plumbing. This PR adds the **server-side**
counterparts:

- `server/discover` handler (replaces the
stub),ProtocolVersionSupporter`
- transport hook for per-transport version filtering,
- transport-agnostic version validation and method-removal enforcement
in `ServerSession.handle`,
- HTTP-level wire compliance for SEP-2575 error codes/status codes,
- bug fix in `internal/jsonrpc2`,`processResult` with an `MCPGODEBUG`
opt-out for backward compatibility.
This commit is contained in:
Guglielmo Colombo 2026-06-08 17:52:10 +02:00 • committed by GitHub
commit dd978160ab
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1 changed files with 702 additions and 187 deletions
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2
internal/jsonrpc2/wire.go
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@ -33,7 +33,7 @@ var (
// ErrServerClosing is returned for calls that arrive while the server is closing.
ErrServerClosing = NewError(-32006, "server is closing")
// ErrClientClosing is a dummy error returned for calls initiated while the client is closing.
ErrClientClosing = NewError(-32003, "client is closing")
ErrClientClosing = NewError(-32007, "client is closing")
// The following errors have special semantics for MCP transports