add client sample (#55)

* add mcp Client example

* Add sample links for weather-stdio-server and kotlin-mcp-client to main readme

README.md

@@ -14,6 +14,8 @@ The Model Context Protocol allows applications to provide context for LLMs in a
 ## Samples
 
 - [kotlin-mcp-server](./samples/kotlin-mcp-server): shows how to set up a Kotlin MCP server with different tools and other features.
+- [weather-stdio-server](./samples/weather-stdio-server): shows how to build a Kotlin MCP server providing weather forecast and alerts using STDIO transport.
+- [kotlin-mcp-client](./samples/kotlin-mcp-client): demonstrates building an interactive Kotlin MCP client that connects to an MCP server via STDIO and integrates with Anthropic’s API.
 
 ## Installation
 

samples/kotlin-mcp-client/.gitignore

@@ -0,0 +1,42 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Kotlin ###
+.kotlin
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

samples/kotlin-mcp-client/README.md

@@ -0,0 +1,69 @@
+# Kotlin MCP Client
+
+This project demonstrates how to build a Model Context Protocol (MCP) client in Kotlin that interacts with an MCP server
+via a STDIO transport layer while leveraging Anthropic's API for natural language processing. The client uses the MCP
+Kotlin SDK to communicate with an MCP server that exposes various tools, and it uses Anthropic's API to process user
+queries and integrate tool responses into the conversation.
+
+For more information about the MCP SDK and protocol, please refer to
+the [MCP documentation](https://modelcontextprotocol.io/introduction).
+
+## Prerequisites
+
+- **Java 17 or later**
+- **Gradle** (or the Gradle wrapper provided with the project)
+- An Anthropic API key set in your environment variable `ANTHROPIC_API_KEY`
+- Basic understanding of MCP concepts and Kotlin programming
+
+## Overview
+
+The client application performs the following tasks:
+
+- **Connecting to an MCP server** —
+  launches an MCP server process (implemented in JavaScript, Python, or Java) using STDIO transport.
+  It connects to the server, retrieves available tools, and converts them to Anthropic’s tool format.
+- **Processing queries** — 
+  accepts user queries, sends them to Anthropic’s API along with the registered tools, and handles responses.
+  If the response indicates a tool should be called, it invokes the corresponding MCP tool and continues the
+  conversation based on the tool’s result.
+- **Interactive chat loop** —
+  runs an interactive command-line loop, allowing users to continuously submit queries and receive responses.
+
+## Building and Running
+
+Use the Gradle wrapper to build the application. In a terminal, run:
+
+```shell
+./gradlew clean build -x test
+```
+
+To run the client, execute the jar file and provide the path to your MCP server script.
+
+To run the client with any MCP server:
+
+```shell
+java -jar build/libs/<your-jar-name>.jar path/to/server.jar # jvm server
+java -jar build/libs/<your-jar-name>.jar path/to/server.py # python server
+java -jar build/libs/<your-jar-name>.jar path/to/build/index.js # node server
+```
+
+> [!NOTE]
+> The client uses STDIO transport, so it launches the MCP server as a separate process.
+> Ensure the server script is executable and is a valid `.js`, `.py`, or `.jar` file.
+
+## Configuration for Anthropic
+
+Ensure your Anthropic API key is available in your environment:
+
+```shell
+export ANTHROPIC_API_KEY=your_anthropic_api_key_here
+```
+
+The client uses `AnthropicOkHttpClient.fromEnv()` to automatically load the API key from `ANTHROPIC_API_KEY` and
+`ANTHROPIC_AUTH_TOKEN` environment variables.
+
+## Additional Resources
+
+- [MCP Specification](https://spec.modelcontextprotocol.io/)
+- [Kotlin MCP SDK](https://github.com/modelcontextprotocol/kotlin-sdk)
+- [Anthropic Java SDK](https://github.com/anthropics/anthropic-sdk-java/tree/main)

samples/kotlin-mcp-client/build.gradle.kts

@@ -0,0 +1,31 @@
+plugins {
+    kotlin("jvm") version "2.1.10"
+    application
+    id("com.github.johnrengelman.shadow") version "8.1.1"
+}
+
+application {
+    mainClass.set("io.modelcontextprotocol.sample.client.MainKt")
+}
+
+
+group = "org.example"
+version = "0.1.0"
+
+val mcpVersion = "0.3.0"
+val slf4jVersion = "2.0.9"
+val anthropicVersion = "0.8.0"
+
+dependencies {
+    implementation("io.modelcontextprotocol:kotlin-sdk:$mcpVersion")
+    implementation("org.slf4j:slf4j-nop:$slf4jVersion")
+    implementation("com.anthropic:anthropic-java:$anthropicVersion")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+kotlin {
+    jvmToolchain(17)
+}

samples/kotlin-mcp-client/gradle.properties

@@ -0,0 +1 @@
+kotlin.code.style=official

samples/kotlin-mcp-client/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

samples/kotlin-mcp-client/gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

samples/kotlin-mcp-client/gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

samples/kotlin-mcp-client/settings.gradle.kts

@@ -0,0 +1,11 @@
+rootProject.name = "kotlin-mcp-client"
+
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version "0.8.0"
+}
+
+dependencyResolutionManagement {
+    repositories {
+        mavenCentral()
+    }
+}

samples/kotlin-mcp-client/src/main/kotlin/io/modelcontextprotocol/sample/client/MCPClient.kt

@@ -0,0 +1,176 @@
+package io.modelcontextprotocol.sample.client
+
+import com.anthropic.client.okhttp.AnthropicOkHttpClient
+import com.anthropic.core.JsonValue
+import com.anthropic.models.messages.*
+import com.fasterxml.jackson.core.type.TypeReference
+import com.fasterxml.jackson.databind.ObjectMapper
+import io.modelcontextprotocol.kotlin.sdk.Implementation
+import io.modelcontextprotocol.kotlin.sdk.TextContent
+import io.modelcontextprotocol.kotlin.sdk.client.Client
+import io.modelcontextprotocol.kotlin.sdk.client.StdioClientTransport
+import kotlinx.coroutines.runBlocking
+import kotlinx.io.asSink
+import kotlinx.io.asSource
+import kotlinx.io.buffered
+import kotlinx.serialization.json.JsonObject
+import kotlin.jvm.optionals.getOrNull
+
+class MCPClient : AutoCloseable {
+    // Configures using the `ANTHROPIC_API_KEY` and `ANTHROPIC_AUTH_TOKEN` environment variables
+    private val anthropic = AnthropicOkHttpClient.fromEnv()
+
+    // Initialize MCP client
+    private val mcp: Client = Client(clientInfo = Implementation(name = "mcp-client-cli", version = "1.0.0"))
+
+    private val messageParamsBuilder: MessageCreateParams.Builder = MessageCreateParams.builder()
+        .model(Model.CLAUDE_3_5_SONNET_20241022)
+        .maxTokens(1024)
+
+    // List of tools offered by the server
+    private lateinit var tools: List<ToolUnion>
+
+    private fun JsonObject.toJsonValue(): JsonValue {
+        val mapper = ObjectMapper()
+        val node = mapper.readTree(this.toString())
+        return JsonValue.fromJsonNode(node)
+    }
+
+    // Connect to the server using the path to the server
+    suspend fun connectToServer(serverScriptPath: String) {
+        try {
+            // Build the command based on the file extension of the server script
+            val command = buildList {
+                when (serverScriptPath.substringAfterLast(".")) {
+                    "js" -> add("node")
+                    "py" -> add(if (System.getProperty("os.name").lowercase().contains("win")) "python" else "python3")
+                    "jar" -> addAll(listOf("java", "-jar"))
+                    else -> throw IllegalArgumentException("Server script must be a .js, .py or .jar file")
+                }
+                add(serverScriptPath)
+            }
+
+            // Start the server process
+            val process = ProcessBuilder(command).start()
+
+            // Setup I/O transport using the process streams
+            val transport = StdioClientTransport(
+                input = process.inputStream.asSource().buffered(),
+                output = process.outputStream.asSink().buffered()
+            )
+
+            // Connect the MCP client to the server using the transport
+            mcp.connect(transport)
+
+            // Request the list of available tools from the server
+            val toolsResult = mcp.listTools()
+            tools = toolsResult?.tools?.map { tool ->
+                ToolUnion.ofTool(
+                    Tool.builder()
+                        .name(tool.name)
+                        .description(tool.description ?: "")
+                        .inputSchema(
+                            Tool.InputSchema.builder()
+                                .type(JsonValue.from(tool.inputSchema.type))
+                                .properties(tool.inputSchema.properties.toJsonValue())
+                                .putAdditionalProperty("required", JsonValue.from(tool.inputSchema.required))
+                                .build()
+                        )
+                        .build()
+                )
+            } ?: emptyList()
+            println("Connected to server with tools: ${tools.joinToString(", ") { it.tool().get().name() }}")
+        } catch (e: Exception) {
+            println("Failed to connect to MCP server: $e")
+            throw e
+        }
+    }
+
+    // Process a user query and return a string response
+    suspend fun processQuery(query: String): String {
+        // Create an initial message with a user's query
+        val messages = mutableListOf(
+            MessageParam.builder()
+                .role(MessageParam.Role.USER)
+                .content(query)
+                .build()
+        )
+
+        // Send the query to the Anthropic model and get the response
+        val response = anthropic.messages().create(
+            messageParamsBuilder
+                .messages(messages)
+                .tools(tools)
+                .build()
+        )
+
+        val finalText = mutableListOf<String>()
+        response.content().forEach { content ->
+            when {
+                // Append text outputs from the response
+                content.isText() -> finalText.add(content.text().getOrNull()?.text() ?: "")
+
+                // If the response indicates a tool use, process it further
+                content.isToolUse() -> {
+                    val toolName = content.toolUse().get().name()
+                    val toolArgs =
+                        content.toolUse().get()._input().convert(object : TypeReference<Map<String, JsonValue>>() {})
+
+                    // Call the tool with provided arguments
+                    val result = mcp.callTool(
+                        name = toolName,
+                        arguments = toolArgs ?: emptyMap()
+                    )
+                    finalText.add("[Calling tool $toolName with args $toolArgs]")
+
+                    // Add the tool result message to the conversation
+                    messages.add(
+                        MessageParam.builder()
+                            .role(MessageParam.Role.USER)
+                            .content(
+                                """
+                                        "type": "tool_result",
+                                        "tool_name": $toolName,
+                                        "result": ${result?.content?.joinToString("\n") { (it as TextContent).text ?: "" }}
+                                    """.trimIndent()
+                            )
+                            .build()
+                    )
+
+                    // Retrieve an updated response after tool execution
+                    val aiResponse = anthropic.messages().create(
+                        messageParamsBuilder
+                            .messages(messages)
+                            .build()
+                    )
+
+                    // Append the updated response to final text
+                    finalText.add(aiResponse.content().first().text().getOrNull()?.text() ?: "")
+                }
+            }
+        }
+
+        return finalText.joinToString("\n", prefix = "", postfix = "")
+    }
+
+    // Main chat loop for interacting with the user
+    suspend fun chatLoop() {
+        println("\nMCP Client Started!")
+        println("Type your queries or 'quit' to exit.")
+
+        while (true) {
+            print("\nQuery: ")
+            val message = readLine() ?: break
+            if (message.lowercase() == "quit") break
+            val response = processQuery(message)
+            println("\n$response")
+        }
+    }
+
+    override fun close() {
+        runBlocking {
+            mcp.close()
+            anthropic.close()
+        }
+    }
+}

samples/kotlin-mcp-client/src/main/kotlin/io/modelcontextprotocol/sample/client/main.kt

@@ -0,0 +1,13 @@
+package io.modelcontextprotocol.sample.client
+
+import kotlinx.coroutines.runBlocking
+
+fun main(args: Array<String>) = runBlocking {
+    if (args.isEmpty()) throw IllegalArgumentException("Usage: java -jar <your_path>/build/libs/kotlin-mcp-client-0.1.0-all.jar <path_to_server_script>")
+    val serverPath = args.first()
+    val client = MCPClient()
+    client.use {
+        client.connectToServer(serverPath)
+        client.chatLoop()
+    }
+}