Merge branch 'main' into lorenze/improve-docs-flows

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Lorenze Jay
2025-12-31 08:32:50 -08:00
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@@ -572,6 +572,55 @@ The `third_method` and `fourth_method` listen to the output of the `second_metho
When you run this Flow, the output will change based on the random boolean value generated by the `start_method`.
### Human in the Loop (human feedback)
The `@human_feedback` decorator enables human-in-the-loop workflows by pausing flow execution to collect feedback from a human. This is useful for approval gates, quality review, and decision points that require human judgment.
```python Code
from crewai.flow.flow import Flow, start, listen
from crewai.flow.human_feedback import human_feedback, HumanFeedbackResult
class ReviewFlow(Flow):
@start()
@human_feedback(
message="Do you approve this content?",
emit=["approved", "rejected", "needs_revision"],
llm="gpt-4o-mini",
default_outcome="needs_revision",
)
def generate_content(self):
return "Content to be reviewed..."
@listen("approved")
def on_approval(self, result: HumanFeedbackResult):
print(f"Approved! Feedback: {result.feedback}")
@listen("rejected")
def on_rejection(self, result: HumanFeedbackResult):
print(f"Rejected. Reason: {result.feedback}")
```
When `emit` is specified, the human's free-form feedback is interpreted by an LLM and collapsed into one of the specified outcomes, which then triggers the corresponding `@listen` decorator.
You can also use `@human_feedback` without routing to simply collect feedback:
```python Code
@start()
@human_feedback(message="Any comments on this output?")
def my_method(self):
return "Output for review"
@listen(my_method)
def next_step(self, result: HumanFeedbackResult):
# Access feedback via result.feedback
# Access original output via result.output
pass
```
Access all feedback collected during a flow via `self.last_human_feedback` (most recent) or `self.human_feedback_history` (all feedback as a list).
For a complete guide on human feedback in flows, including **async/non-blocking feedback** with custom providers (Slack, webhooks, etc.), see [Human Feedback in Flows](/en/learn/human-feedback-in-flows).
## Adding Agents to Flows
Agents can be seamlessly integrated into your flows, providing a lightweight alternative to full Crews when you need simpler, focused task execution. Here's an example of how to use an Agent within a flow to perform market research: