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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

A cancelled request is still answered

Status: Open.

#1259 In modelcontextprotocol/go-sdk;

· jmrplens opened on Sep 13, 2026

mcp: the declared protocol version, not the negotiated one, decides what a session is served

Status: Open.

#1258 In modelcontextprotocol/go-sdk;

· jmrplens opened on Sep 13, 2026

Index: nine findings from one audit of a large MCP server against the specification

Status: Open.

#1257 In modelcontextprotocol/go-sdk;

· jmrplens opened on Sep 13, 2026

stdio: a JSON-RPC batch holding a notification is never answered, or breaks the connection

Status: Open.

#1256 In modelcontextprotocol/go-sdk;

· daFish opened on Sep 13, 2026

Streamable HTTP: an x-mcp-header in a non-reachable schema position (items, oneOf, $ref, ...) is silently accepted instead of rejected

P3Nice to haves, rare edge casesNice to haves, rare edge cases

Status: Open.

#1250 In modelcontextprotocol/go-sdk;

· arpankernel opened on Sep 9, 2026

proposal: auth: support SEP-2350 request-time scope challenges

Status: Open.

Enhancement

#1248 In modelcontextprotocol/go-sdk;

· panyam opened on Sep 7, 2026

mcp: CallToolResult structuredContent loses large integer precision

Status: Open.

#1236 In modelcontextprotocol/go-sdk;

· CaliLuke opened on Sep 4, 2026

A response is still written for a request after notifications/cancelled

P2Moderate issues, valuable feature requestsModerate issues, valuable feature requests

Status: Open.

#1235 In modelcontextprotocol/go-sdk;

· romanidis opened on Sep 3, 2026