Enhance agent prompts (#68)

* Enhance prompts for hierarchical and sequential worker and leader so that they stick to their personas better.

* Fix potential error in SummariserNode if team_responses exceed the context_length of the model

backend/app/core/graph/members.py

@@ -60,7 +60,7 @@ class GraphPerson(BaseModel):
 
     @property
     def persona(self) -> str:
-        return f"Name: {self.name}\nRole: {self.role}\nBackstory: {self.backstory}\n"
+        return f"<persona>\nName: {self.name}\nRole: {self.role}\nBackstory: {self.backstory}\n</persona>"
 
 
 class GraphMember(GraphPerson):
@@ -163,14 +163,18 @@ class WorkerNode(BaseNode):
                     "You are a team member of {team_name} and you are one of the following team members: {team_members_name}.\n"
                     "Your team members (and other teams) will collaborate with you with their own set of skills. "
                     "You are chosen by one of your team member to perform this task. Try your best to perform it using your skills. "
-                    "Stay true to your persona and role:\n"
-                    "{persona}"
-                    "\nBEGIN!\n"
+                    "Stay true to your persona and role:\n{persona}\n"
+                    "<conversation>"
                 ),
             ),
             MessagesPlaceholder(variable_name="task"),
             MessagesPlaceholder(variable_name="messages"),
-            ("human", "?"),
+            (
+                "human",
+                "</conversation>\n"
+                "Remember to stay true to your persona and role:\n{persona}\n"
+                "BEGIN!",
+            ),
         ]
     )
 
@@ -216,12 +220,17 @@ class SequentialWorkerNode(WorkerNode):
                     "If you are unable to perform the task, that's OK, another member with different tools "
                     "will help where you left off. Do not attempt to communicate with other members. "
                     "Execute what you can to make progress. "
-                    "Stay true to your persona and role:\n"
-                    "{persona}"
-                    "\nBEGIN!\n"
+                    "Stay true to your persona and role:\n{persona}\n"
+                    "<conversation>"
                 ),
             ),
             MessagesPlaceholder(variable_name="messages"),
+            (
+                "human",
+                "</conversation>\n"
+                "Remember to stay true to your persona and role:\n{persona}\n"
+                "BEGIN!",
+            ),
         ]
     )
 
@@ -240,9 +249,7 @@ async def work(self, state: TeamState) -> ReturnTeamState:
         name = state["next"]
         member = team.members[name]
         assert isinstance(member, GraphMember), "member is unexpectedly not a Member"
-        team_members_name = self.get_team_members_name(team.members)
         prompt = self.worker_prompt.partial(
-            team_members_name=team_members_name,
             persona=member.persona,
         )
         # If member has no tools, then use a regular model instead of an agent
@@ -289,7 +296,10 @@ class LeaderNode(BaseNode):
             ),
             MessagesPlaceholder(variable_name="main_task"),
             MessagesPlaceholder(variable_name="messages"),
-            ("human", "?"),
+            (
+                "human",
+                "Who should act next? Or should we FINISH? Select one of: {options}.",
+            ),
         ]
     )
 
@@ -385,25 +395,19 @@ class SummariserNode(BaseNode):
                     "Here is the team's task:"
                     "\n\n{team_task}\n\n"
                     "These are the responses from your team members:"
-                    "\n\n{team_responses}\n"
-                    "Your role is to interpret all the responses and give the final answer to the team's task.\n"
                 ),
             ),
-            ("human", "?"),
+            MessagesPlaceholder(variable_name="messages"),
+            (
+                "human",
+                "Your role is to interpret all the responses and give the final answer to the team's task.\n",
+            ),
         ]
     )
 
-    def get_team_responses(self, messages: list[AnyMessage]) -> str:
-        """Create a string containing the team's responses."""
-        result = ""
-        for message in messages:
-            result += f"{message.name}: {message.content}\n"
-        return result
-
     async def summarise(self, state: TeamState) -> dict[str, list[AnyMessage]]:
         team = state["team"]
         team_members_name = self.get_team_members_name(team.members)
-        team_responses = self.get_team_responses(state["messages"])
         # TODO: optimise looking for task
         team_task = state["main_task"][0].content
 
@@ -412,7 +416,6 @@ async def summarise(self, state: TeamState) -> dict[str, list[AnyMessage]]:
                 team_name=team.name,
                 team_members_name=team_members_name,
                 team_task=team_task,
-                team_responses=team_responses,
             )
             | self.final_answer_model
             | RunnableLambda(self.tag_with_name).bind(name=f"{team.name}_answer")  # type: ignore[arg-type]