fix: catch protobuf TypeError on optional streamlit import

README.md

@@ -73,19 +73,28 @@ OPENAI_API_KEY="sk-..."
 ARRAYLAKE_API_KEY="your-arraylake-key"
 ```
 
-### 4. Start the FastAPI backend
+### 4. Install frontend dependencies
 
 ```bash
-uvicorn api.main:app --host 0.0.0.0 --port 8000 --reload
+cd frontend
+npm install
+cd ..
+```
+
+> **Important:** Run `npm install` *before* starting the backend. If uvicorn is already running with `--reload`, the creation of `node_modules/` triggers a server restart, causing temporary `ETIMEDOUT` proxy errors in the frontend.
+
+### 5. Start the FastAPI backend
+
+```bash
+uvicorn api.main:app --host 0.0.0.0 --port 8000 --reload --reload-exclude 'frontend/node_modules/*'
 ```
 
 The API runs on `http://localhost:8000`. Health check: `GET /health`.
 
-### 5. Start the React frontend
+### 6. Start the React frontend
 
 ```bash
 cd frontend
-npm install
 npm run dev
 ```
 

environment.yml

@@ -69,7 +69,6 @@ dependencies:
 
     # pip-only packages (not available on conda-forge)
     - pip:
-        - langchain-classic
-        - langchain-anthropic
+        - langchain-anthropic<1.0.0
         - arraylake
         - aitta-client

src/climsight/tools/destine_retrieval_tool.py

@@ -29,7 +29,7 @@
 
 try:
     import streamlit as st
-except ImportError:
+except Exception:
     st = None
 
 logger = logging.getLogger(__name__)

src/climsight/tools/era5_retrieval_tool.py

@@ -25,7 +25,7 @@
     # Optional: Check for Streamlit to support session state if available
     try:
         import streamlit as st
-    except ImportError:
+    except Exception:
         st = None
 except ImportError as e:
     install_command = "pip install --upgrade xarray zarr arraylake pandas numpy pydantic langchain-core"