Csv Diff MCP tool

Compare two CSV or TSV tables by key column and list the rows that were added, removed or changed - a table diff, not a line diff, so rows in a different order are not changes. keys names one or more columns (a composite key, e.g. email + country); when omitted the tool picks a shared column named id, else a unique *_id column (customer_id), else one named email, sku, uuid, key or code, else the first shared column whose values are unique in both files, else it falls back to whole-row comparison and says so in notes. A row is changed when a non-key column present in both files differs (cells compared exactly; trim and ignore_case apply to key matching only). Duplicate keys within a file keep the first row and are reported in duplicate_keys. A quote that opens and never closes stops the comparison with UNCLOSED_QUOTE naming the file and line. mode "row" compares whole rows as a multiset, with no changed class. Returns counts, the rows (capped at max_rows), and diff_csv: comma-separated, header change_type, then every column of A followed by the new columns of B, then old_<column> for each column that changed anywhere; removed rows hold A's values, added and changed rows B's, and old_<column> holds A's value on changed rows. diff_csv lists every added, removed and changed row; unchanged rows are left out. Nothing is uploaded when used on the browser page.