fix: cleanup error trace for no llm/embedding_config on POST (#2218)

letta/server/rest_api/app.py

@@ -6,7 +6,7 @@ from pathlib import Path
 from typing import Optional
 
 import uvicorn
-from fastapi import FastAPI
+from fastapi import FastAPI, Request
 from fastapi.responses import JSONResponse
 from starlette.middleware.base import BaseHTTPMiddleware
 from starlette.middleware.cors import CORSMiddleware
@@ -136,17 +136,18 @@ def create_application() -> "FastAPI":
             },
         )
 
+    debug_mode = "--debug" in sys.argv
     app = FastAPI(
         swagger_ui_parameters={"docExpansion": "none"},
         # openapi_tags=TAGS_METADATA,
         title="Letta",
         summary="Create LLM agents with long-term memory and custom tools 📚🦙",
         version="1.0.0",  # TODO wire this up to the version in the package
-        debug=True,
+        debug=debug_mode,  # if True, the stack trace will be printed in the response
     )
 
     @app.exception_handler(Exception)
-    async def generic_error_handler(request, exc):
+    async def generic_error_handler(request: Request, exc: Exception):
         # Log the actual error for debugging
         log.error(f"Unhandled error: {exc}", exc_info=True)
 
@@ -166,12 +167,16 @@ def create_application() -> "FastAPI":
             },
         )
 
+    @app.exception_handler(ValueError)
+    async def value_error_handler(request: Request, exc: ValueError):
+        return JSONResponse(status_code=400, content={"detail": str(exc)})
+
     @app.exception_handler(LettaAgentNotFoundError)
-    async def agent_not_found_handler(request, exc):
+    async def agent_not_found_handler(request: Request, exc: LettaAgentNotFoundError):
         return JSONResponse(status_code=404, content={"detail": "Agent not found"})
 
     @app.exception_handler(LettaUserNotFoundError)
-    async def user_not_found_handler(request, exc):
+    async def user_not_found_handler(request: Request, exc: LettaUserNotFoundError):
         return JSONResponse(status_code=404, content={"detail": "User not found"})
 
     settings.cors_origins.append("https://app.letta.com")

letta/server/server.py

@@ -826,6 +826,12 @@ class SyncServer(Server):
         if not user:
             raise ValueError(f"cannot find user with associated client id: {user_id}")
 
+        if request.llm_config is None:
+            raise ValueError("llm_config is required")
+
+        if request.embedding_config is None:
+            raise ValueError("embedding_config is required")
+
         # created and persist the agent state in the DB
         agent_state = PersistedAgentState(
             name=request.name,