feat: update Koog trip planning agent example (#1401)

Update Koog trip planning agent example
---

#### Type of the changes
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
- [ ] Tests improvement
- [ ] Refactoring
- [x] CI/CD changes
- [ ] Dependencies update

#### Checklist
- [ ] The pull request has a description of the proposed change
- [x] I read the [Contributing
Guidelines](https://github.com/JetBrains/koog/blob/main/CONTRIBUTING.md)
before opening the pull request
- [x] The pull request uses **`develop`** as the base branch
- [ ] Tests for the changes have been added
- [ ] All new and existing tests passed

##### Additional steps for pull requests adding a new feature
- [ ] An issue describing the proposed change exists
- [ ] The pull request includes a link to the issue
- [ ] The change was discussed and approved in the issue
- [ ] Docs have been added / updated

Author: siarhei-luskanau

.github/workflows/trip-planning-example.yml

@@ -9,6 +9,10 @@ on:
     paths:
       - 'examples/trip-planning-example/**'
 
+env:
+  JAVA_VERSION: 17
+  JAVA_DISTRIBUTION: 'corretto'
+
 jobs:
   app-compilation:
 
@@ -21,11 +25,11 @@ jobs:
         run: |
           git config --global core.autocrlf input
       - uses: actions/checkout@v6
-      - name: Set up JDK 17
+      - name: Set up JDK ${{ env.JAVA_VERSION }}
         uses: actions/setup-java@v5
         with:
-          java-version: '17'
-          distribution: 'corretto'
+          java-version: ${{ env.JAVA_VERSION }}
+          distribution: ${{ env.JAVA_DISTRIBUTION }}
 
       # Configure Gradle for optimal use in GitHub Actions, including caching of downloaded dependencies.
       # See: https://github.com/gradle/actions/blob/main/setup-gradle/README.md
@@ -35,3 +39,7 @@ jobs:
       - name: Assemble
         working-directory: ./examples/trip-planning-example
         run: ./gradlew assemble
+
+      - name: ktlintCheck
+        working-directory: ./examples/trip-planning-example
+        run: ./gradlew ktlintCheck

examples/trip-planning-example/build.gradle.kts

@@ -1,26 +1,23 @@
 plugins {
     alias(libs.plugins.kotlin.jvm)
     alias(libs.plugins.kotlin.serialization)
+    alias(libs.plugins.ktlint)
     application
 }
 
 application.mainClass.set("ai.koog.agents.examples.tripplanning.MainKt")
 
 dependencies {
+    implementation(libs.koog.agents)
     implementation(libs.kotlin.bom)
-
-    implementation(libs.kotlinx.serialization.json)
-
     implementation(libs.kotlinx.coroutines.core)
-
-    implementation(libs.ktor.client.core)
+    implementation(libs.kotlinx.datetime)
+    implementation(libs.kotlinx.serialization.json)
     implementation(libs.ktor.client.cio)
     implementation(libs.ktor.client.content.negotiation)
-    implementation(libs.ktor.serialization.kotlinx.json)
+    implementation(libs.ktor.client.core)
     implementation(libs.ktor.client.logging)
-
-    implementation(libs.koog.all)
-
+    implementation(libs.ktor.serialization.kotlinx.json)
     implementation(libs.logback.classic)
     implementation(libs.oshai.logging)
 }

examples/trip-planning-example/gradle/libs.versions.toml

@@ -1,34 +1,28 @@
 [versions]
-kotlin = "2.3.10"
-ktor = "3.1.2"
 coroutines = "1.10.2"
-koog = "0.4.2-feat-1-3"
-logback = "1.5.13"
-oshai-logging = "7.0.7"
+koog = "0.8.0"
+kotlin = "2.3.21"
+kotlinx-datetime = "0.7.1"
+ktlint = "14.2.0"
+ktor = "3.4.2"
+logback = "1.5.32"
+oshai-logging = "8.0.01"
 
 [libraries]
+koog-agents = { module = "ai.koog:koog-agents", version.ref = "koog" }
 kotlin-bom = { module = "org.jetbrains.kotlin:kotlin-bom", version.ref = "kotlin" }
-
-# Serialization
+kotlinx-coroutines-core = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-core", version.ref = "coroutines" }
+kotlinx-datetime = { module = "org.jetbrains.kotlinx:kotlinx-datetime", version.ref = "kotlinx-datetime" }
 kotlinx-serialization-json = { module = "org.jetbrains.kotlinx:kotlinx-serialization-json"}
-
-# Ktor
-ktor-client-core = { group = "io.ktor", name = "ktor-client-core", version.ref = "ktor" }
 ktor-client-cio = { group = "io.ktor", name = "ktor-client-cio", version.ref = "ktor" }
 ktor-client-content-negotiation = { group = "io.ktor", name = "ktor-client-content-negotiation", version.ref = "ktor" }
-ktor-serialization-kotlinx-json = { group = "io.ktor", name = "ktor-serialization-kotlinx-json", version.ref = "ktor" }
+ktor-client-core = { group = "io.ktor", name = "ktor-client-core", version.ref = "ktor" }
 ktor-client-logging = { group = "io.ktor", name = "ktor-client-logging", version.ref = "ktor" }
-
-# Koog (meta-dependency to get all core modules)
-koog-all = { module = "ai.koog:koog-agents", version.ref = "koog" }
-
-# Coroutines
-kotlinx-coroutines-core = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-core", version.ref = "coroutines" }
-
-# Logging
+ktor-serialization-kotlinx-json = { group = "io.ktor", name = "ktor-serialization-kotlinx-json", version.ref = "ktor" }
 logback-classic = { module = "ch.qos.logback:logback-classic", version.ref = "logback" }
 oshai-logging = { module = "io.github.oshai:kotlin-logging", version.ref = "oshai-logging" }
 
 [plugins]
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
+ktlint = { id = "org.jlleitschuh.gradle.ktlint", version.ref = "ktlint" }

examples/trip-planning-example/gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,7 @@
-#Mon Jun 16 13:32:43 CEST 2025
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists