Agent with Structured Output

Return a validated Pydantic MovieScript from a WatsonX agent using output_schema.

Code

from typing import List

from agno.agent import Agent, RunOutput  # noqa
from agno.models.ibm import WatsonX
from pydantic import BaseModel, Field
from rich.pretty import pprint  # noqa

class MovieScript(BaseModel):
    setting: str = Field(
        ..., description="Provide a nice setting for a blockbuster movie."
    )
    ending: str = Field(
        ...,
        description="Ending of the movie. If not available, provide a happy ending.",
    )
    genre: str = Field(
        ...,
        description="Genre of the movie. If not available, select action, thriller or romantic comedy.",
    )
    name: str = Field(..., description="Give a name to this movie")
    characters: List[str] = Field(..., description="Name of characters for this movie.")
    storyline: str = Field(
        ..., description="3 sentence storyline for the movie. Make it exciting!"
    )

movie_agent = Agent(
    model=WatsonX(id="mistralai/mistral-small-3-1-24b-instruct-2503"),
    description="You help people write movie scripts.",
    output_schema=MovieScript,
)

response: RunOutput = movie_agent.run("New York")
if not isinstance(response.content, MovieScript):
    raise ValueError("The model did not return a valid MovieScript")
pprint(response.content)

Usage

Set up your virtual environment

uv venv --python 3.12
source .venv/bin/activate

Set your API key

export IBM_WATSONX_API_KEY=xxx
export IBM_WATSONX_PROJECT_ID=xxx

Install dependencies

uv pip install -U ibm-watsonx-ai pydantic rich agno

Run Agent

Save the code above as structured_output.py, then run:

python structured_output.py

The example defines a Pydantic model MovieScript and uses it as the agent's output_schema. Agno attempts to parse the response into a MovieScript object. Invalid output can remain text, so the example checks its type before consuming it.