# Syn CSV Merge

> Skill for joining and merging CSV files in the context of CSV data. Use when the user's task is specifically about joining and merging CSV files.

- Skill: `legendtkl/syn-csv-merge` (Agent Skill)
- Install (CLI): `npx skillmds@latest add legendtkl/syn-csv-merge`
- Raw SKILL.md: https://api.skillmd.com/api/skills/legendtkl/syn-csv-merge/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Data & Analytics
- Author: legendtkl (https://skillmd.com/u/legendtkl)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/legendtkl/syn-csv-merge

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# CSV data: joining and merging CSV files

## When to use

Use this skill for joining and merging CSV files in CSV data. This skill
specifically handles joining and merging CSV files and nothing else in the
CSV data family.

## Procedure

Join multiple CSVs on a key column, handle inner/outer joins, and reconcile mismatched schemas.

## Notes

This is the CSV data skill dedicated to joining and merging CSV files.
Sibling skills cover other CSV data capabilities; this one
is the right choice only when the task is about joining and merging CSV files.