ai-agent-book 精选快照（<2MB 代码与文档，来自 github.com/bojieli/ai-agent-book）

2026-08-20 13:12:50 +00:00
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+---
+title: "Output Format"
+description: ""
+icon: "arrow-right-to-bracket"
+mode: "wide"
+---
+
+## Agent History
+
+The `run()` method returns an `AgentHistoryList` object with the complete execution history:
+
+```python
+history = await agent.run()
+
+# Access useful information
+history.urls()                    # List of visited URLs
+history.screenshot_paths()        # List of screenshot paths  
+history.screenshots()             # List of screenshots as base64 strings
+history.action_names()            # Names of executed actions
+history.extracted_content()       # List of extracted content from all actions
+history.errors()                  # List of errors (with None for steps without errors)
+history.model_actions()           # All actions with their parameters
+history.model_outputs()           # All model outputs from history
+history.last_action()             # Last action in history
+
+# Analysis methods
+history.final_result()            # Get the final extracted content (last step)
+history.is_done()                 # Check if agent completed successfully
+history.is_successful()           # Check if agent completed successfully (returns None if not done)
+history.has_errors()              # Check if any errors occurred
+history.model_thoughts()          # Get the agent's reasoning process (AgentBrain objects)
+history.action_results()          # Get all ActionResult objects from history
+history.action_history()          # Get truncated action history with essential fields
+history.number_of_steps()         # Get the number of steps in the history
+history.total_duration_seconds()  # Get total duration of all steps in seconds
+
+# Structured output (when using output_model_schema)
+history.structured_output         # Property that returns parsed structured output
+```
+
+See all helper methods in the [AgentHistoryList source code](https://github.com/browser-use/browser-use/blob/main/browser_use/agent/views.py#L301).
+
+## Structured Output
+
+For structured output, use the `output_model_schema` parameter with a Pydantic model. [Example](https://github.com/browser-use/browser-use/blob/main/examples/features/custom_output.py).