csv-excel-merger SKILL.md skillA
csv-excel-merger from onewave-ai/claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add onewave-ai/claude-skills/csv-excel-merger@git:20260923.537406aPins git:20260923.537406a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- onewave-ai/claude-skills
- Path
csv-excel-merger/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260923.537406a, committed Sep 23, 2026
- First version recorded
- Oct 22, 2025
- Size
- 6,554 bytes
- Repository stars
- 421
- License
- MIT
Merges, appends, joins, and deduplicates multiple CSV, TSV, and Excel files (including multi-sheet workbooks) with pandas - mapping mismatched column names to one schema, normalizing keys, resolving conflicting values, tracking which file each row came from, and verifying the row math. Use when the user wants to combine spreadsheets or exports, stack monthly files, consolidate contact or lead lists, VLOOKUP-style join two sheets on an ID or email, or dedupe records across sources, even if they…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# CSV/Excel Merger Combine tabular files into one clean output without silently losing, duplicating, or corrupting rows. ## Workflow Copy this checklist and track progress: ``` - [ ] 1. Profile inputs - [ ] 2. Choose append vs join - [ ] 3. Map columns and normalize keys - [ ] 4. Merge and resolve conflicts - [ ] 5. Verify row math - [ ] 6. Write output and report ``` 1. **Profile inputs.** Run the bundled profiler first; it reports encoding, delimiter, rows, headers, candidate keys, and header overlap without changing anything: ```bash python scripts/profile_inputs.py file1.csv file2.xlsx ``` Excel files are profiled per sheet. Confirm with the user which sheets count if a workbook has more than one. 2. **Choose the operation.** This is the decision that most often goes wrong: - **Append (stack)** - same kind of records from different sources or periods (Jan + Feb exports, three lead lists). Use `pd.concat`, then dedupe. - **Join (enrich)** - different facts about the same entities (contacts + their deal values). Use `pd.merge` on a key. - Unsure? If the files share most columns, append. If they share only an ID column, join. …
Read the whole file at its exact version.
How to install
mdr add onewave-ai/claude-skills/csv-excel-merger@sha256:fe129e3529151a9eThe line at the top of this page pins the label git:20260923.537406a, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_o5iify3eojwdubgs)
6 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Oct 22, 2025 and Sep 23, 2026, about one every 168 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260923.537406a latest | 2026-09-23 | 537406a | 6,554 B | A | view · diff |
| git:20260605.5afd849 | 2026-06-05 | 5afd849 | 4,309 B | A | view · diff |
| git:20251022.14b7f5b | 2025-10-22 | 14b7f5b | 8,029 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6554 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
onewave-ai/claude-skills · 421 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_o5iify3eojwdubgs GET https://markdownregistry.com/api/v1/resolve?ref=onewave-ai/claude-skills/csv-excel-merger GET https://markdownregistry.com/api/v1/blob/fe129e3529151a9e07adc8d9cbe5dabc5ec87324d026a0df2653feb765cc5dbd
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.