output_format support for AgentDefinition (subagents)?

[pixelsoccupied]

ClaudeAgentOptions supports output_format for structured JSON outputs:

ClaudeAgentOptions(
    output_format={"type": "json_schema", "schema": {...}} 
)

However, AgentDefinition (for subagents) does not:

  AgentDefinition(
      description="...",
      prompt="...",
      tools=["Read"],
      model="haiku",
      # output_format=???  # -------------------------->Not available
  )

I'm building a data processing pipeline where specialized subagents extract and transform data. Each step needs to produce structured JSON that the next step (or external systems) can reliably consume.

Questions

1. Is this a deliberate design decision? If so, what's the reasoning?
2. Is there a recommended pattern for getting structured data from subagents?
3. Are there plans to add output_format support to AgentDefinition?