Add checkInputUsage to Summarizer API - #97
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Add input measurement helper that checks if text fits within the model's limits before summarizing, mirroring the Prompt API's checkTokenUsage. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Pull request overview
Adds a Summarizer-side input measurement helper so callers can check whether a given input will fit within the model limits before running an actual summarization, analogous to the Prompt API’s token usage check.
Changes:
- Introduces
InputUsageInfoandCheckInputUsageResulttypes for summarizer input measurement results. - Adds
Summarizer.checkInputUsage()(throwing) andSafe.checkInputUsage()(Result-returning) implementations. - Documents the new input measurement feature in the README and re-exports new types from the package entrypoint.
Reviewed changes
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Show a summary per file
| File | Description |
|---|---|
| src/types.ts | Adds summarizer input-usage result types (InputUsageInfo, CheckInputUsageResult). |
| src/summarizer.ts | Exposes throwing checkInputUsage() that wraps the safe implementation. |
| src/summarizer-safe.ts | Implements safe checkInputUsage() using a temporary Summarizer instance and measureInputUsage(). |
| src/index.ts | Re-exports the new public types for library consumers. |
| README.md | Adds usage documentation for summarizer input measurement. |
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Add input measurement helper that checks if text fits within the model's limits before summarizing, mirroring the Prompt API's checkTokenUsage.