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GenerationSpanData

type GenerationSpanData = SpanDataBase & object;

Type Declaration

Section titled “Type Declaration”

input?

Section titled “input?”
optional input?: Record<string, any>[];

model?

Section titled “model?”
optional model?: string;

model_config?

Section titled “model_config?”
optional model_config?: Record<string, any>;

output?

Section titled “output?”
optional output?: Record<string, any>[];

type

Section titled “type”
type: "generation";

usage?

Section titled “usage?”
optional usage?: GenerationUsageData;

Usage fields are intentionally flexible in agents-core tracing.

Exporters are responsible for backend-specific mapping and validation. For example, the OpenAI tracing exporter in @openai/agents-openai keeps top-level generation usage to input_tokens and output_tokens for OpenAI traces ingest, and maps additional usage fields under usage.details. Third-party exporters can choose their own usage schema and transformation strategy.