Hi again! I have a custom node which writes an llm...

# koog-agentic-framework

[Chrylo]

Hi again! I have a custom node which writes an llmSession and tries to restore some data from a "withPersistence" block. The last part are optional data. This works well during productive. However when using the koog testing framwork I don't want to install the persistence feature because I don't need it. Can I check somehow inside the node if the persistence feature is available?

Error executing node (name: RestoreCreateRequirementsHistoryNode): Feature ai.koog.agents.core.agent.entity.AIAgentStorageKey@1e041cd2(name=agents-features-snapshot) is not found.
java.util.NoSuchElementException: Feature ai.koog.agents.core.agent.entity.AIAgentStorageKey@1e041cd2(name=agents-features-snapshot) is not found.
at ai.koog.agents.snapshot.feature.PersistenceKt.persistence(Persistence.kt:404)
at ai.koog.agents.snapshot.feature.PersistenceKt.withPersistence(Persistence.kt:375)

[Jakub Amanowicz]

Hey Mark!
> Can I check somehow inside the node if the persistence feature is available?
Yes 🙂 You can use feature(someAgentFeature) function in your node - it returns nullable feature (depending if it was installed or not). In case of Persistence it would look like this

// in your node
val persistence = feature(Persistence)
if(persistence == null) { 
   // ...
}

Take a look on how `withPersistence` block is implemented - it uses featureOrThrow(Persistence) - a throwable cousin of nullable feature(Persistence)