| Filename | Latest commit message | Latest commit date |
|---|---|---|
ec606dbc24Bumps `kotlin` from 2.2.21 to 2.3.21. Updates `org.jetbrains.kotlin.jvm` from 2.2.21 to 2.3.21 <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md">org.jetbrains.kotlin.jvm's changelog</a>.</em></p> <blockquote> <h2>2.3.21</h2> <h3>Backend. Wasm</h3> <ul> <li><a href="https://youtrack.jetbrains.com/issue/KT-84610"><code>KT-84610</code></a> [Wasm] Failed to compile klibs in IC mode</li> </ul> <h3>Compiler</h3> <ul> <li><a href="https://youtrack.jetbrains.com/issue/KT-84566"><code>KT-84566</code></a> Prevent launching Default dispatcher threads from IJ SDK in kotlin compiler</li> <li><a href="https://youtrack.jetbrains.com/issue/KT-85358"><code>KT-85358</code></a> Native: roll back the workaround for KT-84678 once MapLibre has been properly fixed</li> <li><a href="https://youtrack.jetbrains.com/issue/KT-85626"><code>KT-85626</code></a> <code>@JvmRecord</code> in commonMain breaks compileCommonMainKotlinMetadata with "Cannot access 'java.lang.Record'"</li> <li><a href="https://youtrack.jetbrains.com/issue/KT-85405"><code>KT-85405</code></a> Postpone/Revert <code>DontIgnoreUpperBoundViolatedOnImplicitArguments</code></li> <li><a href="https://youtrack.jetbrains.com/issue/KT-84678"><code>KT-84678</code></a> K/N: Undefined symbol from SPM-added ObjC frameworks when linking iOS target</li> <li><a href="https://youtrack.jetbrains.com/issue/KT-85021"><code>KT-85021</code></a> False positive SUBCLASS_CANT_CALL_COMPANION_PROTECTED_NON_STATIC error in multi-module project</li> </ul> <h3>JavaScript</h3> <ul> <li><a href="https://youtrack.jetbrains.com/issue/KT-82395"><code>KT-82395</code></a> Support top-level declarations from compiler plugins in JS incremental compilation</li> <li><a href="https://youtrack.jetbrains.com/issue/KT-84475"><code>KT-84475</code></a> K/JS: false-positive exportability warnings in multi-module project</li> <li><a href="https://youtrack.jetbrains.com/issue/KT-84633"><code>KT-84633</code></a> Kotlin/JS: "Serializer for class not found" error when IR output granularity is <code>whole-program</code></li> <li><a href="https://youtrack.jetbrains.com/issue/KT-85047"><code>KT-85047</code></a> Kotlin/JS: <code>@JsStatic</code> on suspend fun of class companion generates incorrect d.ts</li> <li><a href="https://youtrack.jetbrains.com/issue/KT-84517"><code>KT-84517</code></a> K/JS: bad mappings data in outputted Kotlin stdlib source map</li> </ul> <h3>Libraries</h3> <ul> <li><a href="https://youtrack.jetbrains.com/issue/KT-71848"><code>KT-71848</code></a> Kotlinx.metadata: Add <code>CompilerPluginData</code> into Km API</li> </ul> <h3>Native. C and ObjC Import</h3> <ul> <li><a href="https://youtrack.jetbrains.com/issue/KT-85399"><code>KT-85399</code></a> Kotlin/Native: TypeCastException when casting ObjC Protocol MetaClass with genericSafeCasts enabled</li> <li><a href="https://youtrack.jetbrains.com/issue/KT-85508"><code>KT-85508</code></a> K/N: TypeCastException when using nw_parameters_create_secure_tcp block parameter on 2.3.20</li> </ul> <h3>Tools. Gradle</h3> <ul> <li><a href="https://youtrack.jetbrains.com/issue/KT-84729"><code>KT-84729</code></a> Update Gradle plugin-publish version to enable configuration cache badge on Gradle plugins portal</li> </ul> <h3>Tools. Gradle. Compiler plugins</h3> <ul> <li><a href="https://youtrack.jetbrains.com/issue/KT-85257"><code>KT-85257</code></a> AGP/Compose: MergeMappingFileTask clears R8 artifacts due to <code>@OutputDirectory</code> annotation on AGP 9.1+</li> </ul> <h3>Tools. Scripts</h3> <ul> <li><a href="https://youtrack.jetbrains.com/issue/KT-85105"><code>KT-85105</code></a> Scripts: JVM backend internal error (IR lowering) when scratch file contains anonymous object</li> <li><a href="https://youtrack.jetbrains.com/issue/KT-85103"><code>KT-85103</code></a> Exception while generating code when explain destructuring decls</li> <li><a href="https://youtrack.jetbrains.com/issue/KT-84842"><code>KT-84842</code></a> scriptCompilationClasspathFromContext behavior changed from 2.3.10 to 2.3.20</li> <li><a href="https://youtrack.jetbrains.com/issue/KT-85029"><code>KT-85029</code></a> Kotlin Scripting: ScriptDiagnostic reports "at null" instead of error location</li> </ul> <h3>Tools. Statistics (FUS)</h3> <ul> <li><a href="https://youtrack.jetbrains.com/issue/KT-85628"><code>KT-85628</code></a> KGP: composite build FUS metrics fail on access of 'configurationTimeMetrics'</li> </ul> <!-- raw HTML omitted --> </blockquote> <p>... (truncated)</p> </details> <details> <summary>Commits</summary> <ul> <li><a href=" |
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| .. | ||
| kotlin-mcp-client | ||
| kotlin-mcp-server | ||
| kotlinlang-mcp-server | ||
| notebooks | ||
| simple-streamable-server | ||
| weather-stdio-server | ||
| README.md | ||
Kotlin MCP SDK Samples
Runnable projects demonstrating MCP server and client implementations with the Kotlin MCP SDK. For background on the protocol itself, see the MCP documentation.
Overview
| Sample | Type | Transport | MCP Features |
|---|---|---|---|
| simple-streamable-server | Server | Streamable HTTP | Tools, Resources, Prompts, Logging |
| kotlinlang-mcp-server | Server | Streamable HTTP | Tools |
| kotlin-mcp-server | Server | STDIO, SSE | Tools, Resources, Prompts |
| weather-stdio-server | Server | STDIO | Tools |
| kotlin-mcp-client | Client | STDIO | Tool discovery & invocation |
| notebooks | Client (Notebook) | Streamable HTTP | Tool discovery & invocation |
Getting Started
- Building a server? Start with simple-streamable-server — it uses the recommended Streamable HTTP transport and covers tools, resources, prompts, and logging.
- Building a client? Open the notebooks sample for a step-by-step walkthrough, or see kotlin-mcp-client for a full CLI client with Anthropic API integration.
Samples
Simple Streamable HTTP Server
A minimal Streamable HTTP server with optional Bearer token authentication. Demonstrates tools
(greet, multi-greet), a prompt template, a resource, and server-to-client logging notifications.
Read more →
Kotlinlang MCP Server
A Streamable HTTP server that exposes the official Kotlin documentation (kotlinlang.org) to LLM clients — full-text search via Algolia and page retrieval in markdown. Demonstrates wrapping a real external API in an MCP server with in-memory caching. Read more →
Kotlin MCP Server
A multi-transport server supporting STDIO, SSE (plain), and SSE (Ktor plugin). Useful for exploring different transport modes side by side. Read more →
Weather STDIO Server
A focused STDIO server that exposes weather forecast and alert tools backed by the weather.gov API. Includes Claude Desktop integration instructions. Read more →
Kotlin MCP Client
An interactive CLI client that connects to any MCP server over STDIO and routes queries through Anthropic's Claude API, bridging MCP tools with LLM conversations. Read more →
MCP Client Notebook
A Kotlin notebook that connects to a remote MCP server via Streamable HTTP and demonstrates ping, tool listing, and tool invocation — all in an interactive cell-by-cell format. Read more →