fix: When using deepseek-reasoner, an error is reported when viewing the agent log.

Author: jiandanfeng

api/core/agent/cot_agent_runner.py

@@ -172,7 +172,11 @@ def increase_usage(final_llm_usage_dict: dict[str, Optional[LLMUsage]], usage: L
 
             self.save_agent_thought(
                 agent_thought=agent_thought,
-                tool_name=scratchpad.action.action_name if scratchpad.action else "",
+                tool_name=(
+                    scratchpad.action.action_name
+                    if scratchpad.action and scratchpad.action.action_name != "Final Answer"
+                    else ""
+                ),
                 tool_input={scratchpad.action.action_name: scratchpad.action.action_input} if scratchpad.action else {},
                 tool_invoke_meta={},
                 thought=scratchpad.thought or "",