feat: add compaction response (#7389)

fern/openapi.json

@@ -8192,8 +8192,15 @@
           }
         },
         "responses": {
-          "204": {
-            "description": "Successful Response"
+          "200": {
+            "description": "Successful Response",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "$ref": "#/components/schemas/CompactionResponse"
+                }
+              }
+            }
           },
           "422": {
             "description": "Validation Error",
@@ -24660,6 +24667,29 @@
         "type": "object",
         "title": "CompactionRequest"
       },
+      "CompactionResponse": {
+        "properties": {
+          "summary_message": {
+            "type": "string",
+            "title": "Summary Message"
+          },
+          "num_messages_before": {
+            "type": "integer",
+            "title": "Num Messages Before"
+          },
+          "num_messages_after": {
+            "type": "integer",
+            "title": "Num Messages After"
+          }
+        },
+        "type": "object",
+        "required": [
+          "summary_message",
+          "num_messages_before",
+          "num_messages_after"
+        ],
+        "title": "CompactionResponse"
+      },
       "CompactionSettings-Input": {
         "properties": {
           "model": {

letta/server/rest_api/routers/v1/agents.py

@@ -2099,13 +2099,13 @@ class CompactionRequest(BaseModel):
     )
 
 
-class CompactionResult(BaseModel):
+class CompactionResponse(BaseModel):
     summary_message: str
     num_messages_before: int
     num_messages_after: int
 
 
-@router.post("/{agent_id}/summarize", status_code=204, operation_id="summarize_messages")
+@router.post("/{agent_id}/summarize", response_model=CompactionResponse, operation_id="summarize_messages")
 async def summarize_messages(
     agent_id: AgentId,
     request: Optional[CompactionRequest] = Body(default=None),
@@ -2146,7 +2146,7 @@ async def summarize_messages(
 
         # update the agent state
         await agent_loop._checkpoint_messages(run_id=None, step_id=None, new_messages=[summary_message], in_context_messages=messages)
-        return CompactionResult(
+        return CompactionResponse(
             summary_message=summary_message,
             num_messages_before=num_messages_before,
             num_messages_after=num_messages_after,