Adds optional token_limit and event_retention_size fields to EventsCompactionConfig. When the latest prompt token count meets/exceeds the threshold, ADK compacts older raw events after the invocation and keeps the last N events un-compacted. Updates prompt history building to apply compaction ranges correctly so retained events remain visible.
Close#4146
Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 868297968
When there are multiple intervals and compactions, the original implementation only keep the last one. The right implementation is to keep as many compaction events/summary as the requested internals.
PiperOrigin-RevId: 816516662
If `EventsCompactionConfig` is provided without a `compactor`, a `SlidingWindowCompactor` is now automatically instantiated using the `root_agent`'s LLM. This simplifies configuration by providing a sensible default.
PiperOrigin-RevId: 816038579
The class is now named `LlmEventSummarizer` to better reflect that its primary function is to use an LLM to summarize events. The docstring has been updated to clarify that this class is responsible *only* for the LLM-based summarization of a given set of events, while the logic for determining *when* and *which* events form the sliding window is handled by an external component, such as an ADK Runner.
PiperOrigin-RevId: 815976264
George WealeandCopybara-Service
Hangfei LinandCopybara-Service