0.10.0

Highlights

This release adds MCP conformance testing infrastructure, SSE reconnection support, Tasks protocol types, resource template matching, and
tool execution properties. It also completes a deprecation cycle — removing all previously deprecated (error-level) symbols from
io.modelcontextprotocol.kotlin.sdk in favor of their replacements in io.modelcontextprotocol.kotlin.sdk.types.

Breaking Changes

• Deprecation cycle completed — All symbols deprecated at ERROR level in 0.9.0 have been removed by @devcrocod (#615). This includes
  the entire io.modelcontextprotocol.kotlin.sdk.types.kt compatibility file (type aliases such as CallToolResult, CancelledNotification,
  ClientCapabilities, CompleteRequest, etc.) and the legacy McpJson in io.modelcontextprotocol.kotlin.sdk. Migrate to the equivalents
  in io.modelcontextprotocol.kotlin.sdk.types.
• SSE/Streamable HTTP transport changes — StreamableHttpClientTransport now accepts ReconnectionOptions for configurable retry
  behavior by @devcrocod (#585, #596). The previous constructor signatures remain available.

Features

• MCP conformance test infrastructure — Comprehensive conformance test suite covering core protocol operations, tool calls, elicitation,
  resources, prompts, and 20 OAuth/auth scenarios. Includes CI workflow, baseline tracking, and shell runner by @devcrocod (#585)
• SSE reconnection with retry support — Client transports now support configurable reconnection with exponential backoff via
  ReconnectionOptions (initial delay, max delay, multiplier, max retries) by @devcrocod (#596)
• Tasks protocol types — Added Task, TaskStatus, and related models per the MCP tasks specification by @devcrocod (#566)
• Resource templates with basic template matcher — Server-side support for URI template-based resource matching by @kpavlov (#502, #606)
• Tool execution properties — Tool now exposes execution properties for richer tool metadata by @devcrocod (#567)

Bug Fixes

• Notifications not delivered over Streamable HTTP — Fixed server-side notification delivery for Streamable HTTP transport sessions by
  @kpavlov (#587, #599)
• Conformance: SEP-1330 enum schemas — Corrected elicitation enum schemas in conformance tests by @kpavlov (#600)

Documentation

• New Streamable HTTP server sample by @devcrocod (#595)
• Updated client and server samples by @devcrocod (#598)
• Added Context7 config file by @devcrocod (#605)
• Updated AGENTS.md by @devcrocod (#612)
• Added missing KDoc for public API members by @kpavlov (#621)

Maintenance

• Simplified and cleaned up CI workflows by @devcrocod (#617)
• Modernized TypeScript integration tests, renamed SSE references to HTTP by @devcrocod (#618)
• Bumped Gradle wrapper from 9.3.1 to 9.4.1 by @dependabot (#614)
• Fix Kotlin language and api version to 2.1 by @kpavlov (#620)

Full Changelog: 0.9.0...0.10.0