"""
Output Guardrail
=============================
Output Guardrail.
"""
from agno.agent import Agent
from agno.exceptions import CheckTrigger, OutputCheckError
from agno.models.openai import OpenAIResponses
from agno.run.agent import RunOutput
def enforce_non_empty_output(run_output: RunOutput) -> None:
"""Reject empty or very short responses."""
content = (run_output.content or "").strip()
if len(content) < 20:
raise OutputCheckError(
"Output is too short to be useful.",
check_trigger=CheckTrigger.OUTPUT_NOT_ALLOWED,
)
# ---------------------------------------------------------------------------
# Create Agent
# ---------------------------------------------------------------------------
agent = Agent(
name="Output-Checked Agent",
model=OpenAIResponses(id="gpt-5.2"),
post_hooks=[enforce_non_empty_output],
)
# ---------------------------------------------------------------------------
# Run Agent
# ---------------------------------------------------------------------------
if __name__ == "__main__":
agent.print_response("Summarize the key ideas in clean architecture.", stream=True)
Run the Example
# Clone and setup repo
git clone https://github.com/agno-agi/agno.git
cd agno/cookbook/02_agents/08_guardrails
# Create and activate virtual environment
./scripts/demo_setup.sh
source .venvs/demo/bin/activate
python output_guardrail.py