Extend the compaction summarizer section to Kotlin - #2161
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The Define a Summarizer group showed Python, Java and TypeScript but not Kotlin, and two lines of surrounding prose understated Kotlin as a result: one attributed LlmEventSummarizer to Python and Java only, the other said only Python and Java can customize the prompt template. Kotlin has had LlmEventSummarizer since v0.3.0 and exposes promptTemplate as a constructor parameter. This is partial coverage rather than an untouched page - the page is already Kotlin-badged and has a Kotlin tab for the token-threshold config. That tab is inline, as are all four siblings in this group, so the new tab is inline too rather than the new .kt file the backlog suggested; mixing forms between two Kotlin tabs on one page would be worse than either choice on its own.
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wikaaaaa
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Aug 24, 2026
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| You can further refine the compactor by modifying its summarizer. In Python, Java | ||
| and Kotlin, customize the prompt template on `LlmEventSummarizer` — the property is | ||
| `prompt_template` in Python and Java, and `promptTemplate` in Kotlin. In TypeScript, |
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Its actually promptTemplate in Java as well - https://github.com/google/adk-java/blob/c1bda9c14dd16a46849dbd6e74773e5595c050b8/core/src/main/java/com/google/adk/summarizer/LlmEventSummarizer.java#L53
adk-java's LlmEventSummarizer exposes promptTemplate, not prompt_template; only Python uses the snake_case name.
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Good catch — fixed. Java uses |
joefernandez
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Aug 28, 2026
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Thanks for the updates!
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What
docs/context/compaction.md.Why
The group showed Python, Java and TypeScript only, and the prose around it repeated the omission:
LlmEventSummarizer(Python/Java) orLlmSummarizer(TypeScript)"LlmEventSummarizerprompt_template"promptTemplateas a constructor parameterKotlin has had
LlmEventSummarizersince v0.3.0. This complements the earlier work that covered only the token-threshold config.Inline, not a new .kt file
The backlog row suggested creating
CompactionSummarizer.kt. I did not, deliberately:A reader switching between the two Kotlin tabs on one page should not see one transcluded and one inline. Both snippets also reference an undefined
rootAgent, exactly as their siblings do, so neither could compile standalone anyway.The cost is that this tab gets L0 rather than the compiler. L0 does validate every import and named argument against real v0.8.0 signatures — which is the failure mode that matters here — but it cannot see type mismatches.
LlmEventSummarizer(model: Model, promptTemplate: String)andEventsCompactionConfig(compactionInterval, overlapSize, summarizer, ...)were both read directly from the v0.8.0 tag.Verification
Ladder: L0, L3, L5, L6 PASS; L1/L2 PASS across the snippet tree; L4
runSnippetsSKIP (no such Gradle task in this repo).Tracked as KT-28.