Fix PORT env var by reading in Python instead of shell expansion

Author: ewalid

Dockerfile.mcp

@@ -28,5 +28,5 @@ ENV PATH="/app/.venv/bin:$PATH"
 # Expose port (Railway sets this dynamically)
 EXPOSE 8080
 
-# Run the MCP HTTP server directly using the venv python
-CMD sh -c 'python -m uvicorn rosetta.api.mcp_http:app --host 0.0.0.0 --port ${PORT:-8080}'
+# Run the MCP HTTP server - use Python to run the module which reads PORT from env
+CMD ["python", "-c", "import os; import uvicorn; uvicorn.run('rosetta.api.mcp_http:app', host='0.0.0.0', port=int(os.environ.get('PORT', 8080)))"]

src/rosetta/api/mcp_http.py

@@ -327,5 +327,6 @@ async def mcp_options():
 
 if __name__ == "__main__":
     import uvicorn
-    port = int(os.getenv("PORT", 8001))
+    port = int(os.getenv("PORT", "8080"))
+    logger.info(f"Starting MCP HTTP server on port {port}")
     uvicorn.run(app, host="0.0.0.0", port=port)