Update mcp_server_sqlite to use robust text encoding by default

The Claude Desktop client will hang in Windows when utilizing extended/multibyte characters in sqlite as a result of decoding errors. The decoding errors are resolved by using UTF-8 encoding.

Configuring Windows to use UTF-8 in place of windows-1252 makes the default server behavior consistent with macOS.  

os.environ PYTHONIOENCODING is checked as to not interfere with an environment override, such as:

{
  "mcpServers": {
    "sqlite": {
      "command": "uvx",
      "args": [
        "mcp-server-sqlite", "--db-path", "./example.db"
      ],
      "env": {
        "PYTHONIOENCODING": "utf-8" 
      }
    }
  }
}

Author: interrobot

src/sqlite/src/mcp_server_sqlite/server.py

@@ -1,3 +1,5 @@
+import os
+import sys
 import sqlite3
 import logging
 from contextlib import closing
@@ -9,6 +11,12 @@
 from pydantic import AnyUrl
 from typing import Any
 
+# reconfigure UnicodeEncodeError prone default (i.e. windows-1252) to utf-8
+if sys.platform == "win32" and os.environ.get('PYTHONIOENCODING') is None:
+    sys.stdin.reconfigure(encoding="utf-8")
+    sys.stdout.reconfigure(encoding="utf-8")
+    sys.stderr.reconfigure(encoding="utf-8")
+
 logger = logging.getLogger('mcp_sqlite_server')
 logger.info("Starting MCP SQLite Server")