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# transcript

The structured transcript from the model session.

```
var transcript: StructuredTranscript?
```

## Discussion

This transcript is required when using [`ToolCallEvaluator`](/documentation/Evaluations/ToolCallEvaluator). If `nil`, [`ToolCallEvaluator`](/documentation/Evaluations/ToolCallEvaluator) throws
[`EvaluationError.missingTranscript(evaluatorType:)`](/documentation/Evaluations/EvaluationError/missingTranscript(evaluatorType:)).

---

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