Hey. I am trying to create a simple agent inside a...

# koog-agentic-framework

[Priyanshu Jain]

Hey. I am trying to create a simple agent inside an android app using Ollama. I am facing this issue when following the Getting Started guide causing the app to crash on launch.

[Priyanshu Jain]

FATAL EXCEPTION: main
                                                                                                    Process: <http://com.test.app|com.test.app>, PID: 8654
                                                                                                    io.ktor.serialization.JsonConvertException: Illegal input: Fields [model, done] are required for type with serial name 'ai.koog.prompt.executor.ollama.client.dto.OllamaChatResponseDTO', but they were missing at path: $
                                                                                                    	at io.ktor.serialization.kotlinx.KotlinxSerializationConverter.deserialize(KotlinxSerializationConverter.kt:77)
                                                                                                    	at io.ktor.serialization.ContentConverterKt$deserialize$$inlined$map$1$2.emit(Emitters.kt:51)
                                                                                                    	at kotlinx.coroutines.flow.FlowKt__BuildersKt$asFlow$$inlined$unsafeFlow$3.collect(SafeCollector.common.kt:111)
                                                                                                    	at io.ktor.serialization.ContentConverterKt$deserialize$$inlined$map$1.collect(SafeCollector.common.kt:109)
                                                                                                    	at kotlinx.coroutines.flow.FlowKt__ReduceKt.firstOrNull(Reduce.kt:247)
                                                                                                    	at kotlinx.coroutines.flow.FlowKt.firstOrNull(Unknown Source:1)
                                                                                                    	at io.ktor.serialization.ContentConverterKt.deserialize(ContentConverter.kt:99)
                                                                                                    	at io.ktor.client.plugins.contentnegotiation.ContentNegotiationKt.ContentNegotiation$lambda$13$convertResponse(ContentNegotiation.kt:234)
                                                                                                    	at io.ktor.client.plugins.contentnegotiation.ContentNegotiationKt.access$ContentNegotiation$lambda$13$convertResponse(ContentNegotiation.kt:1)
                                                                                                    	at io.ktor.client.plugins.contentnegotiation.ContentNegotiationKt$ContentNegotiation$2$2.invokeSuspend(ContentNegotiation.kt:249)
                                                                                                    	at io.ktor.client.plugins.contentnegotiation.ContentNegotiationKt$ContentNegotiation$2$2.invoke(Unknown Source:19)
                                                                                                    	at io.ktor.client.plugins.contentnegotiation.ContentNegotiationKt$ContentNegotiation$2$2.invoke(Unknown Source:10)
                                                                                                    	at io.ktor.client.plugins.api.TransformResponseBodyHook$install$1.invokeSuspend(KtorCallContexts.kt:105)
                                                                                                    	at io.ktor.client.plugins.api.TransformResponseBodyHook$install$1.invoke(Unknown Source:11)
                                                                                                    	at io.ktor.client.plugins.api.TransformResponseBodyHook$install$1.invoke(Unknown Source:6)
                                                                                                    	at io.ktor.util.pipeline.DebugPipelineContext.proceedLoop(DebugPipelineContext.kt:79)
                                                                                                    	at io.ktor.util.pipeline.DebugPipelineContext.proceed(DebugPipelineContext.kt:57)
                                                                                                    	at io.ktor.client.HttpClient$4.invokeSuspend(HttpClient.kt:1379)
                                                                                                    	at io.ktor.client.HttpClient$4.invoke(Unknown Source:11)
                                                                                                    	at io.ktor.client.HttpClient$4.invoke(Unknown Source:6)
                                                                                                    	at io.ktor.util.pipeline.DebugPipelineContext.proceedLoop(DebugPipelineContext.kt:79)
                                                                                                    	at io.ktor.util.pipeline.DebugPipelineContext.proceed(DebugPipelineContext.kt:57)
                                                                                                    	at io.ktor.client.plugins.logging.ReceiveHook$Context.proceed(Logging.kt:290)
                                                                                                    	at io.ktor.client.plugins.logging.LoggingKt$Logging$2$3.invokeSuspend(Logging.kt:209)
                                                                                                    	at io.ktor.client.plugins.logging.LoggingKt$Logging$2$3.invoke(Unknown Source:13)
                                                                                                    	at io.ktor.client.plugins.logging.LoggingKt$Logging$2$3.invoke(Unknown Source:6)
                                                                                                    	at io.ktor.client.plugins.logging.ReceiveHook$install$1.invokeSuspend(Logging.kt:298)
                                                                                                    	at io.ktor.client.plugins.logging.ReceiveHook$install$1.invoke(Unknown Source:11)
                                                                                                    	at io.ktor.client.plugins.logging.ReceiveHook$install$1.invoke(Unknown Source:6)
                                                                                                    	at io.ktor.util.pipeline.DebugPipelineContext.proceedLoop(DebugPipelineContext.kt:79)
                                                                                                    	at io.ktor.util.pipeline.DebugPipelineContext.proceed(DebugPipelineContext.kt:57)
                                                                                                    	at io.ktor.client.plugins.ReceiveError$install$1.invokeSuspend(HttpCallValidator.kt:149)
                                                                                                    	at io.ktor.client.plugins.ReceiveError$install$1.invoke(Unknown Source:11)
                                                                                                    	at io.ktor.client.plugins.ReceiveError$install$1.invoke(Unknown Source:6)
                                                                                                    	at io.ktor.util.pipeline.DebugPipelineContext.proceedLoop(DebugPipelineContext.kt:79)
                                                                                                    	at io.ktor.util.pipeline.DebugPipelineContext.proceed(DebugPipelineContext.kt:57)
                                                                                                    	at io.ktor.util.pipeline.DebugPipelineContext.execute$ktor_utils(DebugPipelineContext.kt:63)
                                                                                                    	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:79)
                                                                                                    	at io.ktor.client.call.HttpClientCall.bodyNullable(HttpClientCall.kt:86)
                                                                                                    	at ai.koog.prompt.executor.ollama.client.OllamaClient.execute(OllamaClient.kt:171)
                                                                                                    	at ai.koog.prompt.executor.ollama.client.OllamaClient$execute$1.invokeSuspend(Unknown Source:15)

[Priyanshu Jain]

Here's my code:

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        enableEdgeToEdge()
        super.onCreate(savedInstanceState)

        setContent {
            val viewModel by viewModels<MainViewModel>()
            Box(modifier = Modifier.fillMaxSize()) {
                viewModel.runQuery("Hey!")
            }
        }
    }
}

And,

class MainViewModel: ViewModel() {

    private val agent = simpleSingleRunAgent(
        executor = simpleOllamaAIExecutor("<http://10.0.2.2:11434>"),
        systemPrompt = """            
            You are Beacon, a helpful assistant.
        """,
        llmModel = OllamaModels.Meta.LLAMA_3_2
    )

    fun runQuery(query: String) {
        viewModelScope.launch {
            agent.runAndGetResult(query)
        }
    }

}

I am using 10.0.2.2:11434 since I am testing this on an emulator and Ollama is running on the host system.

[Vadim Briliantov]

Hi! Thanks for your question. I’ll now try to reproduce your issue locally and come back with some suggestions

[Vadim Briliantov]

Hmm… Just run it locally without android target and it seems to work:

package ai.koog.agents.example.simpleapi

import ai.koog.agents.ext.agent.simpleSingleRunAgent
import ai.koog.prompt.executor.llms.all.simpleOllamaAIExecutor
import ai.koog.prompt.llm.OllamaModels
import kotlinx.coroutines.runBlocking

fun main() {
    val agent = simpleSingleRunAgent(
        executor = simpleOllamaAIExecutor("<http://localhost:11434>"),
        systemPrompt = """            
            You are Beacon, a helpful assistant.
        """,
        llmModel = OllamaModels.Meta.LLAMA_3_2
    )

    runBlocking {
        println(agent.runAndGetResult("Hey!"))
    }
}

…

15:13:15.213 [main] INFO  ai.koog.agents.core.agent.AIAgent - Sending final result [single_run, 23390380-b943-4945-adbe-9d05860c7dfa]
Hello! It's nice to meet you. Is there anything I can help you with or would you like to chat?

BUILD SUCCESSFUL in 3s

Also tried to run it from a separate repository with 0.1.0 published version of Koog — also works:

LF4J(W): See <https://www.slf4j.org/codes.html#noProviders> for further details.
Hello! How can I assist you today? Do you have any questions or need help with something specific?

Process finished with exit code 0

[Vadim Briliantov]

What version of Ollama are you running on your host machine?

[Vadim Briliantov]

Looks like your Ollama instance didn’t respond using the expected protocol and sent some unexpected fields. Might be related to some specific version..

Mine is:

╰─➤  ollama -v
ollama version is 0.6.8

[Vadim Briliantov]

Also, could you please try setting a breakpoint here in ai.koog.prompt.executor.ollama.client.OllamaClient ?
Before .body<OllamaChatResponseDTO>()

What would be the response if you evaluate the expression .bodyAsText() instead? Let’s check what data your Ollama version responds here:

[Priyanshu Jain]

Mine says 0.8.0

[caelum19]

side note, I recommend using LM Studio over Ollama, it's much more stable and more versatile too. Obviously it's important to know that Ollama works still, though trying with LM Studio might help isolate the cause

[Priyanshu Jain]

Okay. Found the issue

On debugging, it turns out that this is the message I get:

{
  "error": "model \"llama3.2\" not found, try pulling it first"
}

This is because when pulling the model from ollama, if I pull using

ollama pull llama3.2:3b

Ollama saves it as llama3.2:3b but if I pull using

ollama pull llama3.2

It pulls the same model but with the tag llama3.2:latest after which this is what I get:

{
  "model": "llama3.2",
  "created_at": "2025-05-29T14:13:01.195511Z",
  "message": {
    "role": "assistant",
    "content": "Hello! How can I assist you today? Do you have any questions or topics you'd like to discuss? I'm all ears (or in this case, all text)!"
  },
  "done_reason": "stop",
  "done": true,
  "total_duration": 1240903250,
  "load_duration": 26085459,
  "prompt_eval_count": 38,
  "prompt_eval_duration": 545364750,
  "eval_count": 36,
  "eval_duration": 668195541
}

So, it was a tag issue 🤦‍♂️.

But, this does mean that the error case isn't being serialized properly which causes a crash.

[Priyanshu Jain]

Thanks @Vadim Briliantov! Your suggestion helped me fix this.

[Vadim Briliantov]

Thanks @Priyanshu Jain for investigating this. Created an issue for that: https://github.com/JetBrains/koog/issues/190