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January 21, 2026 20:16
The dev_mcp command was not loading the .env file before starting the MCP server, causing Lakebase MCP tools to fail authentication with Databricks. Users configure DATABRICKS_CONFIG_PROFILE in their .env file, but the MCP process never saw this environment variable. This fix adds load_dotenv() call before run_mcp_server(), consistent with how other dev commands like dev_start handle .env loading.
Fixes validation error when querying TIMESTAMP columns. The MCP server was passing raw Python datetime objects to the LakebaseSqlResult model, which expects JsonValue types. Added _serialize_row_value() helper to convert: - datetime/date/time -> ISO format string - timedelta -> string representation - Decimal -> float - UUID -> string - bytes/memoryview -> UTF-8 decoded string - nested lists/dicts -> recursively serialized This allows SELECT * queries on tables with TIMESTAMP columns to work without requiring workarounds like casting to text.
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