Allow chat history to be sent to AI engine (#6128)

# Description of Changes
Add an extra parameter to every agent to receive the conversation
history in addition to the current message. This will make it possible
to answer followup questions from the AI without needing to give full
context in your message.

engine/src/stirling/agents/orchestrator.py

@@ -23,6 +23,7 @@ from stirling.contracts import (
     SupportedCapability,
     ToolOperationStep,
     UnsupportedCapabilityResponse,
+    format_conversation_history,
 )
 from stirling.contracts.pdf_edit import EditPlanResponse
 from stirling.models.agent_tool_models import AgentToolId, MathAuditorAgentParams
@@ -117,7 +118,11 @@ class OrchestratorAgent:
 
     async def _run_pdf_edit(self, request: OrchestratorRequest) -> PdfEditResponse:
         return await PdfEditAgent(self.runtime).handle(
-            PdfEditRequest(user_message=request.user_message, file_names=request.file_names)
+            PdfEditRequest(
+                user_message=request.user_message,
+                file_names=request.file_names,
+                conversation_history=request.conversation_history,
+            )
         )
 
     async def delegate_pdf_question(self, ctx: RunContext[OrchestratorDeps]) -> PdfQuestionResponse:
@@ -130,6 +135,7 @@ class OrchestratorAgent:
                 question=request.user_message,
                 file_names=request.file_names,
                 page_text=extracted_text.files if extracted_text is not None else [],
+                conversation_history=request.conversation_history,
             )
         )
 
@@ -137,7 +143,12 @@ class OrchestratorAgent:
         return await self._run_agent_draft(ctx.deps.request)
 
     async def _run_agent_draft(self, request: OrchestratorRequest) -> AgentDraftWorkflowResponse:
-        return await UserSpecAgent(self.runtime).draft(AgentDraftRequest(user_message=request.user_message))
+        return await UserSpecAgent(self.runtime).draft(
+            AgentDraftRequest(
+                user_message=request.user_message,
+                conversation_history=request.conversation_history,
+            )
+        )
 
     async def math_auditor_agent(self, ctx: RunContext[OrchestratorDeps]) -> EditPlanResponse:
         return EditPlanResponse(
@@ -167,7 +178,13 @@ class OrchestratorAgent:
     def _build_prompt(self, request: OrchestratorRequest) -> str:
         artifact_summary = self._describe_artifacts(request)
         file_names = ", ".join(request.file_names) if request.file_names else "Unknown files"
-        return f"User message: {request.user_message}\nFiles: {file_names}\nAvailable artifacts:\n{artifact_summary}"
+        history = format_conversation_history(request.conversation_history)
+        return (
+            f"Conversation history:\n{history}\n"
+            f"User message: {request.user_message}\n"
+            f"Files: {file_names}\n"
+            f"Available artifacts:\n{artifact_summary}"
+        )
 
     def _describe_artifacts(self, request: OrchestratorRequest) -> str:
         if not request.artifacts:

engine/src/stirling/agents/pdf_edit.py

@@ -13,6 +13,7 @@ from stirling.contracts import (
     PdfEditRequest,
     PdfEditResponse,
     ToolOperationStep,
+    format_conversation_history,
 )
 from stirling.models import OPERATIONS, ApiModel, ParamToolModel, ToolEndpoint
 from stirling.services import AppRuntime
@@ -146,6 +147,7 @@ class PdfEditAgent:
     def _build_selection_prompt(self, request: PdfEditRequest) -> str:
         file_names = ", ".join(request.file_names) if request.file_names else "No file names were provided."
         return (
+            f"Conversation history:\n{format_conversation_history(request.conversation_history)}\n"
             f"User request: {request.user_message}\n"
             f"Files: {file_names}\n"
             f"Supported operations: {self._supported_operations_prompt()}\n"

engine/src/stirling/agents/pdf_questions.py

@@ -12,6 +12,7 @@ from stirling.contracts import (
     PdfQuestionNotFoundResponse,
     PdfQuestionRequest,
     PdfQuestionResponse,
+    format_conversation_history,
 )
 from stirling.services import AppRuntime
 
@@ -70,7 +71,13 @@ class PdfQuestionAgent:
             for selection in file_text.pages
         ]
         pages = "\n\n".join(sections)
-        return f"Files: {file_names}\nQuestion: {request.question}\nExtracted page text:\n{pages}"
+        history = format_conversation_history(request.conversation_history)
+        return (
+            f"Conversation history:\n{history}\n"
+            f"Files: {file_names}\n"
+            f"Question: {request.question}\n"
+            f"Extracted page text:\n{pages}"
+        )
 
     def _has_page_text(self, page_text: list[ExtractedFileText]) -> bool:
         return any(selection.text.strip() for file_text in page_text for selection in file_text.pages)

engine/src/stirling/agents/user_spec.py

@@ -18,6 +18,7 @@ from stirling.contracts import (
     EditClarificationRequest,
     EditPlanResponse,
     PdfEditRequest,
+    format_conversation_history,
 )
 from stirling.models import ApiModel
 from stirling.services import AppRuntime
@@ -45,14 +46,15 @@ class UserSpecAgent:
         )
 
     async def draft(self, request: AgentDraftRequest) -> AgentDraftWorkflowResponse:
-        edit_plan = await self._build_edit_plan(request.user_message)
+        edit_plan = await self._build_edit_plan(request.user_message, request.conversation_history)
         if not isinstance(edit_plan, EditPlanResponse):
             return edit_plan
         return AgentDraftResponse(draft=await self._run_draft_agent(request, edit_plan))
 
     async def revise(self, request: AgentRevisionRequest) -> AgentRevisionWorkflowResponse:
         edit_plan = await self._build_edit_plan(
-            f"Current objective: {request.current_draft.objective}\nRevision request: {request.user_message}"
+            f"Current objective: {request.current_draft.objective}\nRevision request: {request.user_message}",
+            request.conversation_history,
         )
         if not isinstance(edit_plan, EditPlanResponse):
             return edit_plan
@@ -80,7 +82,7 @@ class UserSpecAgent:
     def _build_draft_prompt(self, request: AgentDraftRequest, edit_plan: EditPlanResponse) -> str:
         return (
             f"User request:\n{request.user_message}\n\n"
-            f"Conversation history:\n{self._format_conversation_history(request.conversation_history)}\n\n"
+            f"Conversation history:\n{format_conversation_history(request.conversation_history)}\n\n"
             f"Edit plan summary:\n{edit_plan.summary}\n\n"
             f"Edit plan rationale:\n{edit_plan.rationale or 'None'}\n\n"
             f"Edit plan steps:\n{edit_plan.model_dump_json(indent=2)}"
@@ -89,20 +91,18 @@ class UserSpecAgent:
     def _build_revision_prompt(self, request: AgentRevisionRequest, edit_plan: EditPlanResponse) -> str:
         return (
             f"Revision request:\n{request.user_message}\n\n"
-            f"Conversation history:\n{self._format_conversation_history(request.conversation_history)}\n\n"
+            f"Conversation history:\n{format_conversation_history(request.conversation_history)}\n\n"
             f"Current draft:\n{request.current_draft.model_dump_json(indent=2)}\n\n"
             f"Edit plan summary:\n{edit_plan.summary}\n\n"
             f"Edit plan rationale:\n{edit_plan.rationale or 'None'}\n\n"
             f"Edit plan steps:\n{edit_plan.model_dump_json(indent=2)}"
         )
 
-    def _format_conversation_history(self, conversation_history: list[ConversationMessage]) -> str:
-        if not conversation_history:
-            return "None"
-        return "\n".join(f"- {message.role}: {message.content}" for message in conversation_history)
-
     async def _build_edit_plan(
         self,
         user_message: str,
+        conversation_history: list[ConversationMessage],
     ) -> EditPlanResponse | EditClarificationRequest | EditCannotDoResponse:
-        return await self.pdf_edit_agent.handle(PdfEditRequest(user_message=user_message))
+        return await self.pdf_edit_agent.handle(
+            PdfEditRequest(user_message=user_message, conversation_history=conversation_history)
+        )