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mcp: 2026-only server silently serves legacy clients instead of returning -32022

Status: Open.

#1313 In modelcontextprotocol/go-sdk;

· Enigmage opened on Sep 28, 2026

mcp: tool schemas and metadata lose JSON number precision

Status: Open.

#1310 In modelcontextprotocol/go-sdk;

· Tangerg opened on Sep 28, 2026

mcp: client receiving middleware doesn't see input requests on 2026-07-28

Status: Open.

#1305 In modelcontextprotocol/go-sdk;

· po-et opened on Sep 27, 2026

mcp: requests to the client aren't checked against the capabilities it declared

Status: Open.

#1303 In modelcontextprotocol/go-sdk;

· po-et opened on Sep 26, 2026

mcp: the streamable client does not start a new session after a 404, which the 2025-11-25 transport requires

P2Moderate issues, valuable feature requestsModerate issues, valuable feature requests

Status: Open.

#1299 In modelcontextprotocol/go-sdk;

· jmrplens opened on Sep 25, 2026

Annotations.Priority of 0 is dropped on marshal (omitempty)

Status: Open.

#1294 In modelcontextprotocol/go-sdk;

· wdawson opened on Sep 24, 2026

mcp: custom methods registered with AddReceivingCustomMethod are rejected over the SSE transport

Status: Open.

#1291 In modelcontextprotocol/go-sdk;

· fadiroot opened on Sep 24, 2026

proposal: ClientOptions.ResourceSubscriptionEndedHandler for observing resource-subscription termination

Status: Open.

#1284 In modelcontextprotocol/go-sdk;

· jeremy opened on Sep 20, 2026

mcp: a resource update cannot be delivered to one session, and the caller's context never reaches the sending middleware

Status: Open.

Enhancement

#1265 In modelcontextprotocol/go-sdk;

· jmrplens opened on Sep 13, 2026

proposal: mcp: expose the JSON-RPC request id to receiving middleware and handlers

Status: Open.

#1264 In modelcontextprotocol/go-sdk;

· jmrplens opened on Sep 13, 2026

mcp: a server cannot send the notifications/cancelled that 2026-07-28 requires when it tears down a subscriptions/listen stream

Status: Open.

#1263 In modelcontextprotocol/go-sdk;

· jmrplens opened on Sep 13, 2026

mcp: an SSE response keeps http.Server.WriteTimeout armed, so a long-lived stream dies before its first notification

Status: Open.

#1262 In modelcontextprotocol/go-sdk;

· jmrplens opened on Sep 13, 2026