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Backport server/discover / METHOD_NOT_FOUND fix (-32601) to pre-2.0 lines — HTTP 500 has no remedy without Spring Boot 4 migration

Status: Open.

#1085 In modelcontextprotocol/java-sdk;

· eashwar-mp opened on Aug 11, 2026

listTools() and the other no-arg list*() methods follow the cursor chain without any bound

Status: Open.

#1084 In modelcontextprotocol/java-sdk;

· harikrishna8121999 opened on Aug 10, 2026

McpServerSession never sends a response when a request handler's Mono completes empty — violates JSON-RPC 2.0's one-response-per-request contract

Status: Open.

#1081 In modelcontextprotocol/java-sdk;

· ChiragMoradiya opened on Aug 8, 2026

Add transportContextProvider to McpClient.AsyncSpec

area/client

area/transport

waiting for userWaiting for user feedback or more detailsWaiting for user feedback or more details

Status: Open.

#1075 In modelcontextprotocol/java-sdk;

· iuliiasobolevska opened on Aug 1, 2026

Request customizers can't tell which connection a request belongs to

area/client

area/transport

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

waiting for userWaiting for user feedback or more detailsWaiting for user feedback or more details

Status: Open.

Enhancement

#1074 In modelcontextprotocol/java-sdk;

· iuliiasobolevska opened on Aug 1, 2026

Allow composing request customizers on the HTTP client transport builders

area/client

area/transport

P2Moderate issues affecting some users, edge cases, potentially valuable featureModerate issues affecting some users, edge cases, potentially valuable feature

Status: Open.

Enhancement

#1073 In modelcontextprotocol/java-sdk;

· iuliiasobolevska opened on Aug 1, 2026

·  

2.1.0 Planning

[2026-07-28] Java SDK 2.0.0 returns HTTP 500 for OpenAI server/discover requests

Status: Open.

#1072 In modelcontextprotocol/java-sdk;

· morad3741 opened on Jul 30, 2026

Disable standalone GET SSE Stream option for Streamable HTTP client transport

Status: Open.

#1068 In modelcontextprotocol/java-sdk;

· leo237 opened on Jul 21, 2026

Reject listRoots if not supported by client, without sending any request

Status: Open.

#1067 In modelcontextprotocol/java-sdk;

· michaelboyles opened on Jul 19, 2026

Migrate null annotations to jspecify

Status: Open.

#1066 In modelcontextprotocol/java-sdk;

· michaelboyles opened on Jul 18, 2026

Un-deprecate/add no-arg builders

Status: Open.

#1065 In modelcontextprotocol/java-sdk;

· michaelboyles opened on Jul 18, 2026

Expose API to inspect and remove inactive server sessions

Status: Open.

#1063 In modelcontextprotocol/java-sdk;

· ArchForge286 opened on Jul 17, 2026