{
    "action": "tool_call",
    "reasoning": "Profile the columns of the single table (types, roles, null counts, distinct counts, ranges) from the column overview metadata.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT column_name, phys_type, semantic_role, null_count, distinct_count, min_value, max_value FROM analytics.column_overview WHERE table_name = 'semi_conductor_se'",
        "purpose": "List columns with types, roles, null counts, and ranges",
        "source": "raw"
    }
}