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R1/R2: Implement SDK-backed MCP extension on Restlet transports #1558
Description
Follow-up to R0 draft PR #1556. MCP SDK 2.1.0 stateless HTTP/2, Streamable initialization/POST SSE, bounded GET notifications/replay and official STDIO round-trip are demonstrated. R0 does not authorize Ikanos migration: direct revision/session compatibility fails; the tools fixture matches 19/20 corpus responses, with one Jackson diagnostic difference and an explicit null-ID SDK restriction.
Acceptance: independent org.restlet.ext.mcp APIs; SDK-owned codecs/dispatch; explicit owned/borrowed connector lifecycle and finite byte/queue limits; supported module-path seams; strict revision/profile validation; R1 generic STDIO mechanics before R2 framing helpers; bounded Reactor bridges and cancellation; preserve no-session notifications/error semantics. Recheck complete profile, identity/capability checks and parser diagnostics before any migration. Production SSE/reconnect conformance remains R6. No common RPC API, duplicate dispatcher or SDK-owned HTTP engine. No Ikanos source-copy/header decision is needed for the R0 fixtures; agree attribution before any later copying.
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jlouvel commentedon Nov 5, 2026
R1 (#1562) and R2 (#1627) are merged into
3.0, covering this issue's acceptance:org.restlet.ext.mcpuses SDK-owned codecs and dispatch:McpServerAdapter,McpClientAdapter,McpInterceptorandMcpRequestContext, with no common RPC API and no duplicate dispatcher.org.restlet.ext.mcp.GETstreams, replay and server-initiated requests are deliberately not advertised.StreamTransport, with the framing helpers (StdioServerHelper,StdioClientHelper) in R2.The remaining production SSE and reconnect conformance belongs to R6, which will be tracked separately: sessionful Streamable HTTP behind a spike of the SDK's
McpStreamableServerTransportProvider, streamed replies, listening streams and bounded stdio push. Re-checking the profile and attribution before any Ikanos migration stay with Ikanos.🤖 Generated with Claude Code
jlouvel commentedon Nov 5, 2026
The remaining R6 work is tracked in #1640.