The MCP tools list_sources and get_source_info consistently fail with response validation errors, even though the underlying Unstructured API calls succeed.

The failure occurs during response unmarshalling, not during request handling.

Both tools return errors similar to:
Error executing tool <tool_name>: Response validation failed
<multiple> validation errors for Unmarshaller
body.config.<ConnectorConfig>.<required_field>\n  Field require

The errors reference required fields from multiple connector config schemas (e.g. Box, MongoDB, S3, Azure, etc.), even when the source being returned uses only a single connector type.