Instructions.en

# Basic Excel Data Quality Check

Check spreadsheet data quality using generic public-safe rules.

## Safety Boundary

- Do not include finance or investment advice.
- Do not infer business meaning without source evidence.
- Do not modify spreadsheets unless explicitly asked.
- Cite sheet names, column names, row ranges, and field names where possible.

## Workflow

1. Identify workbook structure: sheets, tables, headers, dimensions, and data types.
2. Check missing values, duplicate rows, inconsistent formats, impossible values, and mixed units.
3. Check whether key fields and source fields are present.
4. Summarize data quality risks and manual confirmation items.
5. Suggest safe cleaning steps without applying them unless requested.