Issues

• Question: release timeline and JVM requirements for 2026-07-28 server support

  modelcontextprotocol/kotlin-sdk#1147 · Filter by author Sparkle6979 opened on Oct 30, 2026

• Client.callTool sends "_meta": {} on every call, which strict servers reject

  modelcontextprotocol/kotlin-sdk#1121 · Filter by author anzal1 opened on Oct 16, 2026

• stdio: the time to receive a message grows with the square of its size

  bug
  modelcontextprotocol/kotlin-sdk#1093 · Filter by author rea9r opened on Oct 3, 2026

• Client.connect does not apply the negotiated protocol version to Streamable HTTP transport

  bug
  modelcontextprotocol/kotlin-sdk#1090 · Filter by author xu-baolin opened on Oct 1, 2026

• kotlin-sdk-server iOS Support

  enhancement
  modelcontextprotocol/kotlin-sdk#1088 · Filter by author Stengo opened on Oct 1, 2026

• The client cannot receive results of extension methods

  apienhancementP2
  Enhancement

  modelcontextprotocol/kotlin-sdk#1087 · Filter by author devcrocod opened on Sep 30, 2026 · 0.17.0

• A cancelled handler stops StdioServerTransport

  bugP3
  Bug

  modelcontextprotocol/kotlin-sdk#1086 · Filter by author devcrocod opened on Sep 30, 2026 · 0.22.0

• An empty URI matches a single-variable resource template

  bugP3
  Bug

  modelcontextprotocol/kotlin-sdk#1085 · Filter by author devcrocod opened on Sep 30, 2026 · 0.21.0

• Remove dead branches in resource-template matching

  P3refactoring
  Task

  modelcontextprotocol/kotlin-sdk#1084 · Filter by author devcrocod opened on Sep 30, 2026 · 0.21.0

• AbstractClientTransport.checkState builds a broken error message

  apibugP3
  Bug

  modelcontextprotocol/kotlin-sdk#1083 · Filter by author devcrocod opened on Sep 30, 2026 · 0.19.0
  1

• Dropped resource-updated notifications are never logged

  bugP3
  Bug

  modelcontextprotocol/kotlin-sdk#1082 · Filter by author devcrocod opened on Sep 30, 2026 · 0.18.0

• ModelPreferences reports an invalid speedPriority as costPriority

  bugP3
  Bug

  modelcontextprotocol/kotlin-sdk#1081 · Filter by author devcrocod opened on Sep 30, 2026 · 0.18.0

• Raise the Kover coverage threshold

  P2tests
  Task

  modelcontextprotocol/kotlin-sdk#1077 · Filter by author devcrocod opened on Sep 30, 2026 · 1.0.0

• Document the 2026-07-28 features

  documentationP2
  Task

  modelcontextprotocol/kotlin-sdk#1076 · Filter by author devcrocod opened on Sep 30, 2026 · 1.0.0

• Document ping, log levels, progress, cancellation and version negotiation

  documentationP2
  Task

  modelcontextprotocol/kotlin-sdk#1075 · Filter by author devcrocod opened on Sep 30, 2026 · 1.0.0

• Document elicitation

  documentationP2
  Task

  modelcontextprotocol/kotlin-sdk#1074 · Filter by author devcrocod opened on Sep 30, 2026 · 1.0.0

• Document prompt content: embedded resources and images

  documentationP2
  Task

  modelcontextprotocol/kotlin-sdk#1073 · Filter by author devcrocod opened on Sep 30, 2026 · 1.0.0

• Document resources: binary content, templates and subscriptions

  documentationP2
  Task

  modelcontextprotocol/kotlin-sdk#1072 · Filter by author devcrocod opened on Sep 30, 2026 · 1.0.0

• Document tool results: images, audio, embedded resources and errors

  documentationP2
  Task

  modelcontextprotocol/kotlin-sdk#1071 · Filter by author devcrocod opened on Sep 30, 2026 · 1.0.0

• Decide the default protocol version negotiation for the client

  apiP2
  Task

  modelcontextprotocol/kotlin-sdk#1070 · Filter by author devcrocod opened on Sep 30, 2026 · 1.0.0-RC1

• Gate CI on the legacy, 2026-07-28 and backcompat conformance suites

  P1tests
  Task

  modelcontextprotocol/kotlin-sdk#1069 · Filter by author devcrocod opened on Sep 30, 2026 · 1.0.0-RC1

• Review @ExperimentalMcpApi before 1.0

  apiP1
  Task

  modelcontextprotocol/kotlin-sdk#1068 · Filter by author devcrocod opened on Sep 30, 2026 · 1.0.0-RC1

• Add VERSIONING.md

  documentationP1
  Task

  modelcontextprotocol/kotlin-sdk#1067 · Filter by author devcrocod opened on Sep 30, 2026 · 1.0.0-RC1

• Add an auth hook to the client HTTP transport

  apibreakingenhancementP2
  Enhancement

  modelcontextprotocol/kotlin-sdk#1066 · Filter by author devcrocod opened on Sep 30, 2026 · 0.20.0

• Add a replacement for the buildXxx request builders

  apienhancementP2
  Enhancement

  modelcontextprotocol/kotlin-sdk#1065 · Filter by author devcrocod opened on Sep 30, 2026 · 0.19.0