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Update dependency io.modelcontextprotocol:kotlin-sdk to v0.12.0#478

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Update dependency io.modelcontextprotocol:kotlin-sdk to v0.12.0#478
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renovate/mcp

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@renovate renovate Bot commented Jan 23, 2026 •
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This PR contains the following updates:

Package Change Age Confidence
io.modelcontextprotocol:kotlin-sdk 0.8.1 → 0.12.0 age confidence

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Release Notes

modelcontextprotocol/kotlin-sdk (io.modelcontextprotocol:kotlin-sdk)

v0.12.0

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Description

Adds sampling-with-tools per SEP-1577, JSON Schema dialect declaration on tool schemas, server-side tool name validation, and capability extensions; fixes SSE reconnect on the same session and stops swallowing CancellationException.

Breaking Changes

Sampling messages can carry tool calls and results (SEP-1577) by @​devcrocod in #​718

SamplingMessage.content is now typed as a new SamplingMessageContent supertype, with MediaContent (text/image/audio), ToolUseContent, and ToolResultContent as variants. MediaContent still exists and now extends SamplingMessageContent, so most source code that constructs sampling messages compiles unchanged — but the binary signatures of SamplingMessage, CreateMessageResult, and related types have changed. ClientCapabilities.sampling is also now a typed Sampling object instead of a raw JsonObject. Recompilation is required; consumers reading sampling as JsonObject must migrate to the typed accessors.

watchosX64 and tvosX64 Kotlin/Native targets removed by @​devcrocod in #​727

These targets have been deprecated upstream. Migrate to the corresponding ARM/simulator targets (watchosArm64, watchosSimulatorArm64, tvosArm64, tvosSimulatorArm64).

Features
  • Add $schema field to ToolSchema, declaring JSON Schema 2020-12 as the default dialect (SEP-1613) by @​devcrocod in #​696
  • Validate tool names at registration time on the server, following the MCP tool naming standard (SEP-986) by @​devcrocod in #​695
  • Add extensions field to ClientCapabilities and ServerCapabilities for advertising supported MCP extensions during the initialize handshake by @​eritscher in #​678
Fixed
  • Validate the mcp-protocol-version HTTP header on initialization requests and correct DEFAULT_NEGOTIATED_PROTOCOL_VERSION to match the spec by @​devcrocod in #​697
  • Propagate CancellationException instead of logging it as an error by @​devcrocod in #​706
  • Evict stale GET SSE stream mapping on reconnect so a new GET on the same session is no longer silently rejected by the leftover entry from the previous stream by @​amr in #​716
Maintenance
Dependencies
New Contributors

Full Changelog: modelcontextprotocol/kotlin-sdk@0.11.1...0.12.0

v0.11.1

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Description

Fixes an SSE stream crash on Netty when clients connect to the Streamable HTTP GET endpoint.

Fixed
  • Fixed GET SSE stream crash on Netty in Streamable HTTP where appendSseHeaders() was called after response headers were already committed, causing UnsupportedOperationException and client retry loops by @​devcrocod in #​681
Dependencies

Full Changelog: modelcontextprotocol/kotlin-sdk@0.11.0...0.11.1

v0.11.0

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Adds URL-mode elicitation with typed schema definitions, configurable server payload size limits, and upgrades core dependencies to Kotlin 2.3.

Breaking Changes

ElicitRequestParams is now a sealed interface by @​devcrocod in #​660

Restructured to support both form-based and URL-based elicitation modes per the MCP specification. ElicitRequestParams changed from a data class to a sealed interface with two variants: ElicitRequestFormParams and ElicitRequestUrlParams. A deprecated factory function preserves source compatibility for existing calls.

- val params = ElicitRequestParams(message = "...", requestedSchema = schema)
+ val params = ElicitRequestFormParams(message = "...", requestedSchema = schema)

RequestedSchema.properties type changed by @​devcrocod in #​660

Changed from JsonObject to Map<String, PrimitiveSchemaDefinition> for type safety.

macosX64 target removed by @​devcrocod in #​625

The macosX64 native target was removed following its deprecation in Kotlin 2.2 and scheduled removal in Kotlin 2.3. Use macosArm64 instead.

Features

  • URL-mode elicitation and typed PrimitiveSchemaDefinition hierarchy aligned with MCP specification by @​devcrocod in #​660
  • Configurable max request payload size for StreamableHttpServerTransport via Configuration.maxRequestBodySize by @​jskjw157 in #​646
  • Auto-install ContentNegotiation with McpJson in mcp(), mcpStreamableHttp(), and mcpStatelessStreamableHttp() — users no longer need to configure JSON serialization manually (#​664) by @​kpavlov in
    #​665
  • notifications/elicitation/complete notification from server to client for out-of-band elicitation completion by
    @​devcrocod in #​667

Fixed

  • Elicitation schema defaults are now applied for missing fields in client responses by @​devcrocod in #​661
  • Duplicate initialize requests are now rejected with INVALID_REQUEST error by @​devcrocod in #​624

Maintenance

Dependencies

Full Changelog: modelcontextprotocol/kotlin-sdk@0.10.0...0.11.0

v0.10.0

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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

Maintenance

Full Changelog: modelcontextprotocol/kotlin-sdk@0.9.0...0.10.0

v0.9.0

Compare Source

What's Changed

Breaking Changes
  • Server call handlers now receive a RequestContext — handler lambdas for tools, prompts, and resources have a new context parameter providing access to request metadata (#​515) by @​rnett
  • Ktor extension functions moved from Routing to Route — update call sites: routing { mcpSse() } → route("/mcp") { mcpSse() } or use directly in any Route block (#​531) by @​kpavlov
  • StdioServerTransport rethrows CancellationException — cancellation is no longer silently swallowed; ReadBuffer parsing was also fixed (#​571) by @​kpavlov
New Features
  • kotlin-sdk-testing module — new artifact providing an in-process, channel-based TestClientTransport / TestServerTransport for unit testing MCP servers and clients without network I/O (#​505) by @​kpavlov
  • StreamableHttpServerTransport.Configuration — configurable builder for the Streamable HTTP server transport (timeouts, session handling, etc.) (#​560) by @​kpavlov
  • Ktor extensions for Streamable HTTP — mcpStreamableHttp() Ktor plugin and routing DSL for mounting a Streamable HTTP MCP server (#​504 by @​devcrocod, #​568 by @​kpavlov)
  • $defs support in ToolSchema — JSON Schema $defs / definitions can now be expressed in tool input schemas (#​526) by @​i1bro
Bug Fixes
  • Fixed SSE transport endpoint resolution for non-root mount paths (#​565) by @​Amaneusz
  • Fixed StdioClientTransport hanging indefinitely by adding proper read timeouts (#​528) by @​kpavlov
Improvements
Dependency Updates
  • Kotest 6.1.2, MockK 1.14.9, AtomicFU 0.31.0, Gradle 9.3.1, Kover 0.9.7

New Contributors

Full Changelog: modelcontextprotocol/kotlin-sdk@0.8.4...0.9.0

v0.8.4

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Changes

Full Changelog: modelcontextprotocol/kotlin-sdk@0.8.3...0.8.4

v0.8.3

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What's Changed

Bugfixes

New features

Chores

New Contributors

Full Changelog: modelcontextprotocol/kotlin-sdk@0.8.1...0.8.2

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This PR was generated by Mend Renovate. View the repository job log.

@renovate renovate Bot changed the title Update dependency io.modelcontextprotocol:kotlin-sdk to v0.8.3 Update dependency io.modelcontextprotocol:kotlin-sdk to v0.8.4 Feb 17, 2026
@renovate renovate Bot changed the title Update dependency io.modelcontextprotocol:kotlin-sdk to v0.8.4 Update dependency io.modelcontextprotocol:kotlin-sdk to v0.9.0 Mar 5, 2026
@renovate renovate Bot changed the title Update dependency io.modelcontextprotocol:kotlin-sdk to v0.9.0 Update dependency io.modelcontextprotocol:kotlin-sdk to v0.10.0 Mar 26, 2026
@renovate renovate Bot force-pushed the renovate/mcp branch 2 times, most recently from f6388ec to 4a8856e Compare April 2, 2026 14:28
@renovate renovate Bot changed the title Update dependency io.modelcontextprotocol:kotlin-sdk to v0.10.0 Update dependency io.modelcontextprotocol:kotlin-sdk to v0.11.0 Apr 2, 2026
@renovate renovate Bot force-pushed the renovate/mcp branch 2 times, most recently from 0930926 to b433524 Compare April 13, 2026 13:06
@renovate renovate Bot changed the title Update dependency io.modelcontextprotocol:kotlin-sdk to v0.11.0 Update dependency io.modelcontextprotocol:kotlin-sdk to v0.11.1 Apr 13, 2026
@renovate renovate Bot changed the title Update dependency io.modelcontextprotocol:kotlin-sdk to v0.11.1 Update dependency io.modelcontextprotocol:kotlin-sdk to v0.12.0 Apr 29, 2026
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