Correct error message for invalid output types with strict JSON schema

[DanielHashmi]

Problem

1. Incorrect parameter reference: Suggests passing output_schema_strict=False to Agent(), but this parameter doesn't exist
2. Vague guidance: The phrase "make the output type strict" doesn't explain HOW to make types strict

Solution

Updated the error message to provide accurate, actionable guidance:

Before:

"Either make the output type strict, or pass output_schema_strict=False to your Agent()"

After:

"Either use a dataclass, Pydantic model, or TypedDict, or wrap your type with AgentOutputSchema(your_type, strict_json_schema=False)"

[seratch]

LGTM. @rm-openai what do you think?

[rm-openai]

Agree with the AgentOutputSchema... stuff, but we shouldn't recommend using a dataclass/pydantic etc, because any type is generally valid

[DanielHashmi]

@rm-openai Updated to only include AgentOutputSchema stuff 👍