Markdown / CSV verification guide

Repair AI Markdown table shifts before CSV handoff

Check the header, separator and body widths before handing off an AI-generated table. A pipe inside a cell is not a new column when escaped or quoted. Never invent an ambiguous missing value.

Import a table into Excel

Make the widths agree

Check	Valid	Negative
Header	3 columns	Missing separator
Separator	3 columns	2 columns
Body	3 columns every row	Rows differ
Pipe in cell	Text in one cell	New column by mistake

Validate parsed column counts, not the visual appearance alone.

Verify with fixtures

input.md is a valid example with an escaped pipe, negative.md has a short separator, and expected.csv is the checked output.

| id | name | note |
| --- | --- | --- |
| 001 | 山田 | "A | B" |

If a row has multiple plausible repairs, confirm the source and keep the repair basis.

Hand off with Web-Tool

Keep the original Markdown and make a working copy.
Use Table to Excel and verify output widths and values.
Confirm the pipe stayed in one cell and every row has the same width.
Give the recipient expected.csv and checklist.md.

This guide and Table to Excel work in the browser. Input is not sent to an external server.

Do not guess repairs

If the separator or body row has too few cells, do not fill blanks automatically. Confirm the source, generation conditions and sender first.