Update services/pipeline_executor.py

services/pipeline_executor.py

@@ -75,7 +75,8 @@ Pipeline components will be in format:
             ("system", "File path: {file_path}"),
             ("system", "Pipeline to execute: {pipeline_json}"),
             ("system", "Session ID: {session_id}"),
-            ("human", "Execute the pipeline. Process each component in order and finalize with complete JSON results.")
+            ("human", "Execute the pipeline. Process each component in order and finalize with complete JSON results."),
+            MessagesPlaceholder(variable_name="agent_scratchpad")  # REQUIRED for LangChain agent
         ])
         
         agent = create_tool_calling_agent(llm, tools, prompt)
@@ -147,7 +148,8 @@ You must call tools, not generate descriptions. This is mandatory."""
             ("system", system_instructions),
             ("system", "File to process: {file_path}"),
             ("system", "Pipeline configuration: {pipeline_json}"),
-            ("human", "Execute ALL the tools in the pipeline. Call each tool and get real results. Do not describe, actually execute!")
+            ("human", "Execute ALL the tools in the pipeline. Call each tool and get real results. Do not describe, actually execute!"),
+            MessagesPlaceholder(variable_name="agent_scratchpad")  # REQUIRED for LangChain agent
         ])
         
         agent = create_tool_calling_agent(llm, tools, prompt)