**Description:**
- Using @21st-dev/magic@latest via MCP stdio transport
- Calling 21st_magic_component_builder with valid search queries ("button variants", "card component", "input text field")
- First call returns [object Object] with no actual component code — just a generic shadcn install instruction
- Second and third calls fail entirely with [Tool result missing due to internal error]
- Concurrent/parallel calls seem to exacerbate the issue (3 calls made simultaneously)
- Environment: Windows 11, Node v22.22.2, Claude Code
