{
    "action": "tool_call",
    "reasoning": "I need to list all columns, their data types, and their meanings (semantic roles). The previous result was truncated to 50 rows, and the dataset has 61 columns. I will query meta.columns to get the full list.",
    "tool": "query_sql",
    "args": {
        "purpose": "Get all columns, types, and semantic roles for raw.ai_supercomputers",
        "source": "raw",
        "sql": "SELECT column_name, phys_type, semantic_role FROM meta.columns WHERE table_name = 'ai_supercomputers' ORDER BY column_name;"
    }
}