Bumps `mcp-kotlin` from 0.12.0 to 0.13.0.
Updates `io.modelcontextprotocol:kotlin-sdk-client` from 0.12.0 to
0.13.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/modelcontextprotocol/kotlin-sdk/releases">io.modelcontextprotocol:kotlin-sdk-client's
releases</a>.</em></p>
<blockquote>
<h2>0.13.0</h2>
<h2>Description</h2>
<p>Adds a <code>tasks</code> capability and a typed
<code>elicitation</code> capability, hardens transport lifecycle,
dispatchers, and back-pressure, and enables DNS rebinding protection by
default.</p>
<h3>Breaking Changes</h3>
<p><strong>Typed <code>elicitation</code> capability and new
<code>tasks</code> capability</strong> by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/732">#732</a></p>
<p><code>ClientCapabilities.elicitation</code> is now a typed
<code>ClientCapabilities.Elicitation</code> (<code>form</code>,
<code>url</code>) instead of a raw <code>JsonObject?</code>, and both
<code>ClientCapabilities</code> and <code>ServerCapabilities</code>
gained a typed <code>tasks</code> capability. The constructors of both
types changed and are binary-incompatible; recompilation is
required.</p>
<p><strong>Transport handlers now run on
<code>Dispatchers.Default</code></strong> by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/778">#778</a></p>
<p>Handlers moved from <code>Dispatchers.IO</code> to
<code>Dispatchers.Default</code> (override via
<code>handlerDispatcher</code>), <code>send()</code> now suspends under
back-pressure instead of buffering unbounded, and the two-argument
<code>StdioServerTransport(input, output)</code> constructor is
deprecated in favor of the builder-lambda form. Also fixes a
<code>start()</code>/<code>close()</code> race, consistent
<code>CancellationException</code> propagation, and an
input-<code>Source</code> leak (closes <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/573">#573</a>,
<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/574">#574</a>,
<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/708">#708</a>).</p>
<p><strong>DNS rebinding protection enabled by default</strong> by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/659">#659</a></p>
<p><code>enableDnsRebindingProtection</code> now defaults to
<code>true</code> on
<code>mcpStreamableHttp</code>/<code>mcpStatelessStreamableHttp</code>,
and the <code>Route.mcp()</code> / <code>Application.mcp()</code>
overloads gained <code>enableDnsRebindingProtection</code>,
<code>allowedHosts</code>, and <code>allowedOrigins</code> parameters
(binary-incompatible on JVM). Only <code>localhost</code>,
<code>127.0.0.1</code>, and <code>[::1]</code> are allowed by default;
opt out with <code>enableDnsRebindingProtection = false</code>. The
<code>Configuration.enableDnsRebindingProtection</code>,
<code>.allowedHosts</code>, and <code>.allowedOrigins</code> properties
are deprecated in favor of the new <code>DnsRebindingProtection</code>
plugin.</p>
<h3>Features</h3>
<ul>
<li>Add a <code>tasks</code> capability (<code>list</code>,
<code>cancel</code>, and per-request augmentation for sampling and
elicitation) on <code>ClientCapabilities</code> and
<code>ServerCapabilities</code>, with assertions for
<code>tasks/*</code> and <code>notifications/tasks/status</code>
enforced by <code>Client</code> and <code>ServerSession</code> by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/732">#732</a></li>
<li>Configurable <code>handlerDispatcher</code> and
<code>ioDispatcher</code>, plus an optional caller-supplied
<code>CoroutineScope</code>, on transports by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/778">#778</a></li>
</ul>
<h3>Fixed</h3>
<ul>
<li>Fire <code>onClose</code> callbacks on
<code>SseClientTransport</code> when the SSE session ends — whether
closed gracefully or terminated by an error — matching the other client
transports by <a
href="https://github.com/jskjw157"><code>@jskjw157</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/738">#738</a></li>
</ul>
<h3>Security</h3>
<ul>
<li>Enable DNS rebinding protection by default across all HTTP
transports, including the SSE endpoints that previously had none (see
Breaking Changes for migration) by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/659">#659</a></li>
<li>Cap a single stdio JSON-RPC frame at 16 MiB, throwing the new
<code>TooLongFrameException</code> instead of buffering unbounded when a
peer never sends a newline terminator by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="6e6f80512f">6e6f805</a></li>
</ul>
<h3>Maintenance</h3>
<ul>
<li>Remove the test-only <code>dev.mokksy:mokksy</code> dependency in
favor of <code>MockEngine</code> and <code>embeddedServer</code> by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/754">#754</a></li>
</ul>
<h3>Dependencies</h3>
<ul>
<li>Ktor to v3.4.3 in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/785">#785</a></li>
<li>kotlinx.coroutines to v1.11.0 in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/760">#760</a></li>
<li>kotlin-logging to v8.0.03 in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/752">#752</a>,
<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/783">#783</a></li>
<li>24 further Dependabot updates across sample projects, TypeScript
conformance-test fixtures, and build/test tooling (JUnit, slf4j-simple,
Gradle wrapper, anthropic-java)</li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/modelcontextprotocol/kotlin-sdk/compare/0.12.0...0.13.0">https://github.com/modelcontextprotocol/kotlin-sdk/compare/0.12.0...0.13.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="b7eeeb1205"><code>b7eeeb1</code></a>
release: 0.13.0 (<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/796">#796</a>)</li>
<li><a
href="6e6f80512f"><code>6e6f805</code></a>
Merge commit from fork</li>
<li><a
href="0eb1822853"><code>0eb1822</code></a>
Update Ktor to version 3.4.3 (<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/785">#785</a>)</li>
<li><a
href="0adfb3bcdb"><code>0adfb3b</code></a>
fix!: harden lifecycle, dispatchers, back-pressure (<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/778">#778</a>)</li>
<li><a
href="37ee423308"><code>37ee423</code></a>
chore(deps): bump the infrastructure group with 2 updates (<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/783">#783</a>)</li>
<li><a
href="ff4b6232ba"><code>ff4b623</code></a>
chore(deps): bump the other-dependencies group across 3 directories with
3 up...</li>
<li><a
href="78066a9cf6"><code>78066a9</code></a>
chore(deps): bump the all-dependencies group across 1 directory with 2
update...</li>
<li><a
href="1ff5f003b6"><code>1ff5f00</code></a>
chore(deps): bump qs from 6.14.2 to 6.15.2 in
/integration-test/src/jvmTest/t...</li>
<li><a
href="6d5bac1e67"><code>6d5bac1</code></a>
chore(deps): bump gradle-wrapper from 9.5.0 to 9.5.1 (<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/776">#776</a>)</li>
<li><a
href="c8545606bb"><code>c854560</code></a>
chore(deps): bump the all-dependencies group across 1 directory with 2
update...</li>
<li>Additional commits viewable in <a
href="https://github.com/modelcontextprotocol/kotlin-sdk/compare/0.12.0...0.13.0">compare
view</a></li>
</ul>
</details>
<br />
Updates `io.modelcontextprotocol:kotlin-sdk-server` from 0.12.0 to
0.13.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/modelcontextprotocol/kotlin-sdk/releases">io.modelcontextprotocol:kotlin-sdk-server's
releases</a>.</em></p>
<blockquote>
<h2>0.13.0</h2>
<h2>Description</h2>
<p>Adds a <code>tasks</code> capability and a typed
<code>elicitation</code> capability, hardens transport lifecycle,
dispatchers, and back-pressure, and enables DNS rebinding protection by
default.</p>
<h3>Breaking Changes</h3>
<p><strong>Typed <code>elicitation</code> capability and new
<code>tasks</code> capability</strong> by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/732">#732</a></p>
<p><code>ClientCapabilities.elicitation</code> is now a typed
<code>ClientCapabilities.Elicitation</code> (<code>form</code>,
<code>url</code>) instead of a raw <code>JsonObject?</code>, and both
<code>ClientCapabilities</code> and <code>ServerCapabilities</code>
gained a typed <code>tasks</code> capability. The constructors of both
types changed and are binary-incompatible; recompilation is
required.</p>
<p><strong>Transport handlers now run on
<code>Dispatchers.Default</code></strong> by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/778">#778</a></p>
<p>Handlers moved from <code>Dispatchers.IO</code> to
<code>Dispatchers.Default</code> (override via
<code>handlerDispatcher</code>), <code>send()</code> now suspends under
back-pressure instead of buffering unbounded, and the two-argument
<code>StdioServerTransport(input, output)</code> constructor is
deprecated in favor of the builder-lambda form. Also fixes a
<code>start()</code>/<code>close()</code> race, consistent
<code>CancellationException</code> propagation, and an
input-<code>Source</code> leak (closes <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/573">#573</a>,
<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/574">#574</a>,
<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/708">#708</a>).</p>
<p><strong>DNS rebinding protection enabled by default</strong> by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/659">#659</a></p>
<p><code>enableDnsRebindingProtection</code> now defaults to
<code>true</code> on
<code>mcpStreamableHttp</code>/<code>mcpStatelessStreamableHttp</code>,
and the <code>Route.mcp()</code> / <code>Application.mcp()</code>
overloads gained <code>enableDnsRebindingProtection</code>,
<code>allowedHosts</code>, and <code>allowedOrigins</code> parameters
(binary-incompatible on JVM). Only <code>localhost</code>,
<code>127.0.0.1</code>, and <code>[::1]</code> are allowed by default;
opt out with <code>enableDnsRebindingProtection = false</code>. The
<code>Configuration.enableDnsRebindingProtection</code>,
<code>.allowedHosts</code>, and <code>.allowedOrigins</code> properties
are deprecated in favor of the new <code>DnsRebindingProtection</code>
plugin.</p>
<h3>Features</h3>
<ul>
<li>Add a <code>tasks</code> capability (<code>list</code>,
<code>cancel</code>, and per-request augmentation for sampling and
elicitation) on <code>ClientCapabilities</code> and
<code>ServerCapabilities</code>, with assertions for
<code>tasks/*</code> and <code>notifications/tasks/status</code>
enforced by <code>Client</code> and <code>ServerSession</code> by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/732">#732</a></li>
<li>Configurable <code>handlerDispatcher</code> and
<code>ioDispatcher</code>, plus an optional caller-supplied
<code>CoroutineScope</code>, on transports by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/778">#778</a></li>
</ul>
<h3>Fixed</h3>
<ul>
<li>Fire <code>onClose</code> callbacks on
<code>SseClientTransport</code> when the SSE session ends — whether
closed gracefully or terminated by an error — matching the other client
transports by <a
href="https://github.com/jskjw157"><code>@jskjw157</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/738">#738</a></li>
</ul>
<h3>Security</h3>
<ul>
<li>Enable DNS rebinding protection by default across all HTTP
transports, including the SSE endpoints that previously had none (see
Breaking Changes for migration) by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/659">#659</a></li>
<li>Cap a single stdio JSON-RPC frame at 16 MiB, throwing the new
<code>TooLongFrameException</code> instead of buffering unbounded when a
peer never sends a newline terminator by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="6e6f80512f">6e6f805</a></li>
</ul>
<h3>Maintenance</h3>
<ul>
<li>Remove the test-only <code>dev.mokksy:mokksy</code> dependency in
favor of <code>MockEngine</code> and <code>embeddedServer</code> by <a
href="https://github.com/devcrocod"><code>@devcrocod</code></a> in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/754">#754</a></li>
</ul>
<h3>Dependencies</h3>
<ul>
<li>Ktor to v3.4.3 in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/785">#785</a></li>
<li>kotlinx.coroutines to v1.11.0 in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/760">#760</a></li>
<li>kotlin-logging to v8.0.03 in <a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/752">#752</a>,
<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/pull/783">#783</a></li>
<li>24 further Dependabot updates across sample projects, TypeScript
conformance-test fixtures, and build/test tooling (JUnit, slf4j-simple,
Gradle wrapper, anthropic-java)</li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/modelcontextprotocol/kotlin-sdk/compare/0.12.0...0.13.0">https://github.com/modelcontextprotocol/kotlin-sdk/compare/0.12.0...0.13.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="b7eeeb1205"><code>b7eeeb1</code></a>
release: 0.13.0 (<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/796">#796</a>)</li>
<li><a
href="6e6f80512f"><code>6e6f805</code></a>
Merge commit from fork</li>
<li><a
href="0eb1822853"><code>0eb1822</code></a>
Update Ktor to version 3.4.3 (<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/785">#785</a>)</li>
<li><a
href="0adfb3bcdb"><code>0adfb3b</code></a>
fix!: harden lifecycle, dispatchers, back-pressure (<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/778">#778</a>)</li>
<li><a
href="37ee423308"><code>37ee423</code></a>
chore(deps): bump the infrastructure group with 2 updates (<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/783">#783</a>)</li>
<li><a
href="ff4b6232ba"><code>ff4b623</code></a>
chore(deps): bump the other-dependencies group across 3 directories with
3 up...</li>
<li><a
href="78066a9cf6"><code>78066a9</code></a>
chore(deps): bump the all-dependencies group across 1 directory with 2
update...</li>
<li><a
href="1ff5f003b6"><code>1ff5f00</code></a>
chore(deps): bump qs from 6.14.2 to 6.15.2 in
/integration-test/src/jvmTest/t...</li>
<li><a
href="6d5bac1e67"><code>6d5bac1</code></a>
chore(deps): bump gradle-wrapper from 9.5.0 to 9.5.1 (<a
href="https://redirect.github.com/modelcontextprotocol/kotlin-sdk/issues/776">#776</a>)</li>
<li><a
href="c8545606bb"><code>c854560</code></a>
chore(deps): bump the all-dependencies group across 1 directory with 2
update...</li>
<li>Additional commits viewable in <a
href="https://github.com/modelcontextprotocol/kotlin-sdk/compare/0.12.0...0.13.0">compare
view</a></li>
</ul>
</details>
<br />
Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Runnable projects demonstrating MCP server and client implementations with the
Kotlin MCP SDK.
For background on the protocol itself, see the MCP documentation.
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 →
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