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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

77

1.35x
Quality

88%

Does it follow best practices?

Impact

76%

1.35x

Average score across 10 eval scenarios

SecuritybySnyk

Passed

No known issues

SKILL.md
Quality
Evals
Security

Quality

Content

77%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

This is a solid, actionable skill with excellent workflow clarity including explicit validation loops via recalc.py. The code examples are executable and well-chosen. The main weakness is that the content is somewhat lengthy—particularly the financial modeling standards section—and could benefit from splitting detailed reference material into separate files for better progressive disclosure.

Suggestions

Move the financial model standards (color coding, number formatting, documentation requirements) into a separate FINANCIAL_MODELS.md reference file to reduce the main skill's token footprint.

Remove or condense the 'WRONG vs CORRECT' hardcoding examples—a single brief note with one example pair would suffice since Claude understands the concept of using formulas over hardcoded values.

DimensionReasoningScore

Conciseness

The skill contains some unnecessary verbosity—the 'WRONG vs CORRECT' examples are somewhat redundant for Claude, and the financial model color coding/documentation standards are quite lengthy. However, most content is relevant and not explaining basic concepts Claude already knows. Some tightening is possible (e.g., the checklist section repeats points already covered).

2 / 3

Actionability

The skill provides fully executable, copy-paste ready code examples for all major workflows (creating, editing, reading Excel files). Commands for recalc.py are concrete with example usage, and the JSON output format is explicitly shown. Formula examples are specific and executable.

3 / 3

Workflow Clarity

The common workflow is clearly sequenced (choose tool → create/load → modify → save → recalculate → verify/fix errors) with an explicit validation feedback loop: recalc.py returns error details, user fixes errors, then recalculates again. The verification checklist adds additional validation checkpoints. The 'MANDATORY IF USING FORMULAS' callout is a strong checkpoint.

3 / 3

Progressive Disclosure

The content is reasonably well-structured with clear section headers, but it's quite long and monolithic for a single file with no bundle files to offload detail into. The financial model standards section (color coding, number formatting, documentation requirements) could be split into a separate reference file. No external references are provided despite the content length warranting them.

2 / 3

Total

10

/

12

Passed

Description

100%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

This is a strong skill description that clearly defines its scope around spreadsheet operations, lists concrete capabilities, and provides explicit trigger conditions with a numbered list of use cases. The inclusion of specific file extensions and spreadsheet-specific terminology like 'preserving formulas' and 'recalculating formulas' makes it highly distinctive and easy for Claude to match appropriately.

DimensionReasoningScore

Specificity

Lists multiple specific concrete actions: creating spreadsheets with formulas and formatting, reading/analyzing data, modifying existing spreadsheets while preserving formulas, data analysis and visualization, and recalculating formulas.

3 / 3

Completeness

Clearly answers both 'what' (comprehensive spreadsheet creation, editing, analysis with formulas, formatting, visualization) and 'when' (explicit numbered list of trigger scenarios prefaced by 'When Claude needs to work with spreadsheets').

3 / 3

Trigger Term Quality

Includes strong natural keywords users would say: 'spreadsheet', '.xlsx', '.xlsm', '.csv', '.tsv', 'formulas', 'formatting', 'data analysis', 'visualization'. These cover common file extensions and task-related terms users would naturally mention.

3 / 3

Distinctiveness Conflict Risk

Clearly scoped to spreadsheet files with specific file extensions (.xlsx, .xlsm, .csv, .tsv) and spreadsheet-specific operations like formula recalculation and preserving formulas. Unlikely to conflict with general data analysis or document processing skills.

3 / 3

Total

12

/

12

Passed

Validation

100%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation11 / 11 Passed

Validation for skill structure

No warnings or errors.

Repository
ComposioHQ/awesome-claude-skills
Reviewed

Table of Contents

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