Add CIO runtime dependencies and slf4j

- Add runtime dependencies to CIO server/client in samples
- Update README.md about adding Ktor engine dependencies
- Add test runtime dependency to slf4j-simple

Author: kpavlov

README.md

@@ -40,10 +40,23 @@ Add the dependency:
 
 ```kotlin
 dependencies {
-    // Use the badge above for the latest version
+    // See the badge above for the latest version
     implementation("io.modelcontextprotocol:kotlin-sdk:$mcpVersion")
 }
 ```
+MCP SDK uses [Ktor](https://ktor.io/), but does not come with a specific engine dependency.
+You should add [Ktor client](https://ktor.io/docs/client-dependencies.html#engine-dependency) 
+and/or [Ktor server](https://ktor.io/docs/client-dependencies.html#engine-dependency) dependency 
+to your project yourself, e.g.:
+```kotlin
+dependencies {
+    // for client:
+    implementation("io.ktor:ktor-client-cio:$ktorVersion")
+    // for server:
+    implementation("io.ktor:ktor-server-netty:$ktorVersion")
+    
+}
+```
 
 ## Quick Start
 

kotlin-sdk-client/build.gradle.kts

@@ -43,6 +43,7 @@ kotlin {
                 implementation(kotlin("test"))
                 implementation(libs.ktor.client.mock)
                 implementation(libs.kotlinx.coroutines.test)
+                runtimeOnly(libs.slf4j.simple)
             }
         }
     }

kotlin-sdk-core/build.gradle.kts

@@ -47,5 +47,11 @@ kotlin {
                 implementation(libs.kotest.assertions.json)
             }
         }
+
+        jvmTest {
+            dependencies {
+                runtimeOnly(libs.slf4j.simple)
+            }
+        }
     }
 }

kotlin-sdk-server/build.gradle.kts

@@ -21,7 +21,12 @@ kotlin {
             dependencies {
                 implementation(kotlin("test"))
                 implementation(libs.kotlinx.coroutines.test)
-                implementation(libs.slf4j.simple)
+            }
+        }
+
+        jvmTest {
+            dependencies {
+                runtimeOnly(libs.slf4j.simple)
             }
         }
     }

kotlin-sdk-test/build.gradle.kts

@@ -13,19 +13,18 @@ kotlin {
             dependencies {
                 implementation(project(":kotlin-sdk"))
                 implementation(kotlin("test"))
+                implementation(libs.kotest.assertions.json)
+                implementation(libs.kotlin.logging)
+                implementation(libs.kotlinx.coroutines.test)
                 implementation(libs.ktor.client.cio)
                 implementation(libs.ktor.server.cio)
                 implementation(libs.ktor.server.test.host)
-                implementation(libs.kotlinx.coroutines.test)
-                implementation(libs.kotest.assertions.json)
             }
         }
         jvmTest {
             dependencies {
                 implementation(kotlin("test-junit5"))
-                implementation(libs.kotlin.logging)
-                implementation(libs.ktor.server.cio)
-                implementation(libs.ktor.client.cio)
+                runtimeOnly(libs.slf4j.simple)
             }
         }
     }

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

@@ -13,8 +13,9 @@ version = "0.1.0"
 
 dependencies {
     implementation(libs.mcp.kotlin)
-    implementation(libs.slf4j.simple)
+    implementation(libs.ktor.client.cio)
     implementation(libs.anthropic.java)
+    runtimeOnly(libs.slf4j.simple)
 }
 
 tasks.test {

samples/weather-stdio-server/build.gradle.kts

@@ -13,15 +13,17 @@ repositories {
     mavenCentral()
 }
 
-
 group = "org.example"
 version = "0.1.0"
 
 dependencies {
-    implementation(libs.mcp.kotlin)
-    implementation(libs.slf4j.simple)
     implementation(libs.ktor.client.content.negotiation)
     implementation(libs.ktor.serialization.kotlinx.json)
+    implementation(libs.mcp.kotlin)
+    runtimeOnly(libs.ktor.server.cio)
+    runtimeOnly(libs.ktor.client.cio)
+    runtimeOnly(libs.slf4j.simple)
+
     testImplementation(kotlin("test"))
     testImplementation(libs.kotlinx.coroutines.test)
 }