This file is byte-identical to the first copy the registry indexed, one of 8 indexed copies. Same content hash, so the same checks give both the same grade.
xlsx from frankxai/claude-skills-library is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
Comprehensive spreadsheet creation, editing, and analysis with support for formulas, formatting, data analysis, and visualization. When Claude needs to work with spreadsheets (.xlsx, .xlsm, .csv, .tsv, etc) for: (1) Creating new spreadsheets with formulas and formatting, (2) Reading or analyzing data, (3) Modify existing spreadsheets while preserving formulas, (4) Data analysis and visualization in spreadsheets, or (5) Recalculating formulas.
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
# Requirements for Outputs
## All Excel files
### Zero Formula Errors
- Every Excel model MUST be delivered with ZERO formula errors (#REF!, #DIV/0!, #VALUE!, #N/A, #NAME?)
### Preserve Existing Templates (when updating templates)
- Study and EXACTLY match existing format, style, and conventions when modifying files
- Never impose standardized formatting on files with established patterns
- Existing template conventions ALWAYS override these guidelines
## Financial models
### Color Coding Standards
Unless otherwise stated by the user or existing template
#### Industry-Standard Color Conventions
- **Blue text (RGB: 0,0,255)**: Hardcoded inputs, and numbers users will change for scenarios
- **Black text (RGB: 0,0,0)**: ALL formulas and calculations
- **Green text (RGB: 0,128,0)**: Links pulling from other worksheets within same workbook
- **Red text (RGB: 255,0,0)**: External links to other files
- **Yellow background (RGB: 255,255,0)**: Key assumptions needing attention or cells that need to be updated
### Number Formatting Standards
#### Required Format Rules
- **Years**: Format as text strings (e.g., "2024" not "2,024")
…
The line at the top of this page pins the label git:20260525.468c26e, 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.
GET https://markdownregistry.com/api/v1/artifacts/art_5epkeuwnnfnks3e3
GET https://markdownregistry.com/api/v1/resolve?ref=frankxai/claude-skills-library/xlsx
GET https://markdownregistry.com/api/v1/blob/020ccdb5932257b66c638ec1157ea248d57fa52c8c01f1f68b559b5970c7df35
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.
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frankxai/claude-skills-library · absorbed/harness/santa-method/SKILL.md · Send a finished change to two reviewers who did not write it, using one rubric, and stop after three rounds. Use before…
frankxai/claude-skills-library · absorbed/harness/search-first/SKILL.md · Look for an existing repo, package, and skill before writing a new one. Use when starting a feature, adding a…
frankxai/claude-skills-library · absorbed/harness/security-review/SKILL.md · Scan a port or a diff before it lands, and apply the narrow deny list for this machine. Use before copying upstream…
frankxai/claude-skills-library · absorbed/harness/strategic-compact/SKILL.md · Write what worked, what failed, and what is still open to a file, then compact at a phase boundary. Use when a long…
anthropics/skills · skills/xlsx/SKILL.md · Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to…
eigent-ai/eigent · resources/example-skills/xlsx/SKILL.md · Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to…
thinkinaixyz/deepchat · resources/skills/xlsx/SKILL.md · Comprehensive spreadsheet creation, editing, and analysis with support for formulas, formatting, data analysis, and…
davepoon/buildwithclaude · plugins/all-skills/skills/xlsx/SKILL.md · Comprehensive spreadsheet creation, editing, and analysis with support for formulas, formatting, data analysis, and…
ginlix-ai/langalpha · plugins/langalpha_deliverables/skills/xlsx/SKILL.md · Excel workbooks with live formulas: build or edit .xlsx models with openpyxl, recalculate with IronCalc or LibreOffice…
fcakyon/claude-codex-settings · plugins/anthropic-office-skills/skills/xlsx/SKILL.md · Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to…
mateaix/mateclaw · mateclaw-server/src/main/resources/skills/xlsx/SKILL.md · Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to…
