Source verified. Facts shown were checked against the linked official source. Source verified does not mean that AC Circuit operationally tested this capability or endorses it. AC Circuit does not verify security, performance, availability, or fitness for a particular use.
Unclaimed directory record. AC Circuit does not represent or endorse this provider.
AC Circuit has not operationally tested security, performance, availability, or fitness for a particular use.
Anthropic Excel (XLSX) skill
An official Anthropic skill package for reading, creating, editing, calculating, formatting, charting, cleaning, and validating spreadsheet files.
Delivery
Source-available skill folder in Anthropic's official GitHub repository
Supported buyer outcomes
Works with
- Claude Code
- Claude.ai
- Claude API
- XLSX, XLSM, XLTX, CSV, and TSV files
Includes
- SKILL.md instructions
- Spreadsheet scripts
- Recalculation and validation guidance
- License terms
Capability circuit
Review the source and license → Install or load the skill in a compatible Claude product → Provide the spreadsheet task and files → Recalculate, inspect, and validate the workbook
Source and review record
Evidence
Source facts
Anthropic XLSX skill source
Anthropic publishes an XLSX skill covering spreadsheet reading, creation, editing, formulas, formatting, charting, data cleaning, recalculation, and validation.
- Retrieved
- 2026-08-13
- Limitation
- Source review only; the proprietary license terms, dependencies, runtime behavior, security, formulas, and workbook output were not independently assessed.
- Provenance
- Source record
Editorial estimates
No editorial estimates are recorded.
Buyer assumptions
No buyer assumptions are recorded.
Security and business risk
Source verification is not a security assessment. Review the package and its dependencies in your own environment before use.
- Security status
- Not independently assessed
- Business risk
- Context-dependent
- Data exposure
- Workbook values, formulas, and metadata, Macros and external-link references, Financial or operational data and local file paths
The instructions can invoke spreadsheet libraries and LibreOffice and can encounter macros or external links. AC Circuit did not inspect every dependency or execute the skill.
Risk rationale: AC Circuit editorial classification: a routine tracker and a finance model use the same file format but carry very different business consequences.
Human review: Verify formulas, assumptions, source data, macros, external links, and decision-critical outputs with an accountable human reviewer.
Record details
- Asset form
- AI skill
- Maintenance owner
- shared
- Access method
- Downloadable skill package
- Commercial status
- Not confirmed
- Last reviewed
- 2026-08-13
- Provider
- Anthropic
Requirements
- A compatible Claude product with Agent Skills support
- The spreadsheet libraries and office tools named by the skill
- Permission to process the supplied workbook data
Verification scope
Reviewed the official skill's spreadsheet triggers, creation and editing tools, formula and recalculation requirements, macro and external-link cautions, and proprietary license declaration.
Limitations
- AC Circuit reviewed the official source description only; it did not run the capability or verify security, performance, or availability.
- Anthropic describes the document skills as source-available rather than open source; complete terms are in the included license.
- A clean recalculation does not prove formulas, assumptions, links, or financial conclusions are correct.