fix: record the external memory summary inside of the context viewer (#2306)

letta/agent.py

@@ -1042,6 +1042,7 @@ class Agent(BaseAgent):
             num_archival_memory=agent_manager_passage_size,
             num_recall_memory=message_manager_size,
             num_tokens_external_memory_summary=num_tokens_external_memory_summary,
+            external_memory_summary=external_memory_summary,
             # top-level information
             context_window_size_max=self.agent_state.llm_config.context_window,
             context_window_size_current=num_tokens_used_total,

letta/schemas/memory.py

@@ -30,6 +30,9 @@ class ContextWindowOverview(BaseModel):
     num_tokens_external_memory_summary: int = Field(
         ..., description="The number of tokens in the external memory summary (archival + recall metadata)."
     )
+    external_memory_summary: str = Field(
+        ..., description="The metadata summary of the external memory sources (archival + recall metadata)."
+    )
 
     # context window breakdown (in tokens)
     # this should all add up to context_window_size_current

tests/test_server.py

@@ -515,6 +515,7 @@ def test_get_context_window_overview(server: SyncServer, user, agent_id):
     assert overview.num_archival_memory is not None
     assert overview.num_recall_memory is not None
     assert overview.num_tokens_external_memory_summary is not None
+    assert overview.external_memory_summary is not None
     assert overview.num_tokens_system is not None
     assert overview.system_prompt is not None
     assert overview.num_tokens_core_memory is not None