fastxlsx

name	fastxlsx
description	Edit and validate `.xlsx` workbooks through the `fastxlsx` CLI. Use for config-table updates, structured-sheet edits, sheet management, style changes, and roundtrip-safe workbook modifications instead of touching workbook XML directly.

FastXLSX

This is the Claude Code skill entrypoint for this repository.

Keep this file short. Detailed workflow rules live in WORKFLOW.md inside this Claude Code skill directory.

When To Use

• Inspecting .xlsx workbooks before editing
• Plain sheet reads and exports through sheet records / sheet export
• Single-cell edits and style updates
• config-table updates
• Structured table edits and profile-based workflows only when profile or table boundaries are known
• Deterministic multi-step edits through apply --ops
• Roundtrip validation after workbook changes

When a read command returns the wrong shape, empty results, or structure rows instead of business rows, stay inside the fastxlsx workflow, start from inspect, and prefer reusing that sheet's recommendedRead.commands.* output before inventing your own fallback command.

Command Entry

For .xlsx tasks in Claude Code, read this skill's workflow first:

.claude/skills/fastxlsx/WORKFLOW.md

Use the first available CLI entry:

fastxlsx <subcommand> ...

If fastxlsx is not on PATH but the package is available:

npx fastxlsx <subcommand> ...

Only when working inside the fastxlsx repository root:

npm run cli -- <subcommand> ...

The workflow document uses fastxlsx as shorthand for whichever entry is available.

Canonical References

• Workflow: WORKFLOW.md
• Ops schema: OPS-SCHEMA.md

Read the workflow document before editing. Read the ops schema only when preparing an apply --ops payload.