google-adk-kotlin-core/com.google.adk.kt.summarizer/LlmEventSummarizer

LlmEventSummarizer

class LlmEventSummarizer(val model: Model, val promptTemplate: String = DEFAULT_PROMPT_TEMPLATE) : EventSummarizer

An LLM-based event summarizer for context compaction.

This class is responsible for summarizing a provided list of events into a single compacted event. It is designed to be used as part of a context-compaction process such as sliding-window or tail-retention compaction.

When summarizeEvents is called with a list of events, this class formats the events, generates a summary using the model, and returns a new Event containing the summary within a com.google.adk.kt.events.EventCompaction on its Event.actions.

Constructors

LlmEventSummarizer

constructor(model: Model, promptTemplate: String = DEFAULT_PROMPT_TEMPLATE)

constructor(model: Model)

Creates a summarizer using the default prompt template. Java callers need this because promptTemplate's default is not visible to them and its value is private.

Properties

model

val model: Model

The LLM used for summarization.

promptTemplate

val promptTemplate: String

An optional template string for the summarization prompt. If not provided, a default template will be used. The template must contain a "{conversation_history}" placeholder, which is replaced with the formatted event history.

Functions

summarizeEvents

open suspend override fun summarizeEvents(events: List<Event>): Event?

Compacts the given events into a single Event.