fix: solves the malformed json output and pydantic validation error produced by the 'planner' node by forcing the llm response to strictly comply with the pydantic 'Plan' model (bytedance#322)

Author: taxman20000

src/graph/nodes.py

@@ -104,7 +104,8 @@ def planner_node(
     if AGENT_LLM_MAP["planner"] == "basic":
         llm = get_llm_by_type(AGENT_LLM_MAP["planner"]).with_structured_output(
             Plan,
-            method="json_mode",
+            method="json_schema",
+            strict=True,
         )
     else:
         llm = get_llm_by_type(AGENT_LLM_MAP["planner"])