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Dockerfile

@@ -1,31 +1,28 @@
+# Dockerfile
 FROM python:3.10-slim
 
-# Set working directory in the container
 WORKDIR /app
+# tells the system to treat /app as the "home" directory, so Streamlit will create /app/.streamlit instead of /.streamlit.
+# /app is already writable as root, so no permission issues.
+ENV HOME=/app
 
-# Unbuffer STDIO for subprocess pipes (fixes hanging in MCP stdio)
-ENV PYTHONUNBUFFERED=1
 
-# Copy requirements and install dependencies
-COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
 
-# Create group and non-root user for HF Spaces, then make /app writable
-RUN addgroup --gid 1000 user && \
-    adduser --disabled-password --gecos '' --uid 1000 --gid 1000 user && \
-    chown -R user:user /app
+# (Optional) system deps if you need them; safe to remove if not needed
+RUN apt-get update && apt-get install -y --no-install-recommends curl && rm -rf /var/lib/apt/lists/*
 
-# Copy application files
-COPY . .
+# Install Python deps
+COPY requirements.txt /app/
+RUN pip install --upgrade pip && pip install --no-cache-dir -r requirements.txt
 
-# Switch to non-root user
-USER user
+# Copy code
+COPY . /app
 
-# Expose Streamlit port
-EXPOSE 8501
+# Do NOT set STREAMLIT_SERVER_PORT here.
+# Spaces will inject $PORT at runtime.
 
-# Health check for Streamlit
-HEALTHCHECK CMD curl --fail http://localhost:8501/_stcore/health || exit 1
 
-# Run Streamlit
-CMD ["streamlit", "run", "frontend.py", "--server.port=8501", "--server.address=0.0.0.0"]
+# Start Streamlit on the port Spaces provides, and bind to 0.0.0.0
+# CMD ["bash", "-lc", "streamlit run /app/frontend.py --server.port $PORT --server.address 0.0.0.0"]
+# CMD ["sh", "-c", "streamlit run /app/frontend.py --server.port $PORT --server.address 0.0.0.0"]
+CMD ["streamlit", "run", "/app/frontend.py", "--server.port", "8501", "--server.address", "0.0.0.0"]

arithmetic_server.py

@@ -1,8 +1,4 @@
 from mcp.server.fastmcp import FastMCP
-from starlette.applications import Starlette
-from starlette.routing import Mount
-import contextlib
-import uvicorn
 
 # Creates a server named "Arithmetic"
 mcp = FastMCP("Arithmetic")
@@ -29,16 +25,6 @@ def divide(a: int, b: int) -> float:
         raise ValueError("Division by zero is not allowed.")
     return a / b
 
-@contextlib.asynccontextmanager
-async def lifespan(app: Starlette):
-    async with contextlib.AsyncExitStack() as stack:
-        await stack.enter_async_context(mcp.session_manager.run())
-        yield
-
-app = Starlette(
-    routes=[Mount("/", mcp.streamable_http_app())],
-    lifespan=lifespan,
-)
 
 if __name__ == "__main__":
     mcp.run(transport="stdio")

stock_server.py

@@ -2,10 +2,6 @@ from mcp.server.fastmcp import FastMCP
 import aiohttp
 import json
 from typing import Optional
-from starlette.applications import Starlette
-from starlette.routing import Mount
-import contextlib
-import uvicorn
 
 mcp = FastMCP("StockMarket")
 
@@ -63,16 +59,5 @@ async def get_company_news(symbol: str, limit: int = 3) -> str:
     2. Analysts upgrade {symbol} to 'Buy' rating
     3. {symbol} unveils new product line for 2025"""
 
-@contextlib.asynccontextmanager
-async def lifespan(app: Starlette):
-    async with contextlib.AsyncExitStack() as stack:
-        await stack.enter_async_context(mcp.session_manager.run())
-        yield
-
-app = Starlette(
-    routes=[Mount("/", mcp.streamable_http_app())],
-    lifespan=lifespan,
-)
-
 if __name__ == "__main__":
-    mcp.run(transport="stdio")
+    mcp.run(transport="stdio")