What’s inside

One SKILL.md (the playbook) + one starter template. A preview:

Cost Ledger Total

When to use

• A budget, quote, or invoice needs to be shown line by line so the audience trusts the total
• A "where does the money go" explainer must make every line item visible before the total lands
• A pricing breakdown has 4–10 line items and a single total that would feel arbitrary without the build
• A finance or procurement video must show the arithmetic, not just announce a number
• A proposal walkthrough needs the viewer to follow the addition in real time
• You have a list of charges that add up to one total, and the addition itself is the point

Workflow

1. Build the ledger (input: your charges → output: ledger table)
   List every line item: short label (≤5 words), quantity if any, and amount. Sort in the order you want the audience to read them — usually largest first, or in the order the charges occur. Add the amounts by hand and write the total separately, then check the addition twice: a ledger animation with a wrong total is worse than no animation. Decide now whether any lines are deductions (discounts, credits) — they get a minus sign and a different treatment in the animation, and they must be included in the total.
2. Design the ledger layout (input: ledger table → output: layout)
   The ledger is a ruled table: labels left-aligned, amounts right-aligned, one row per line item, generous row height so each row reads on a phone. A running subtotal column or a subtotal readout sits at the top-right or beside the table — the audience watches it climb as rows land. Leave clear space below the last row for the rule line and the total row; the total row is larger type (at least 1.5× the row type) and sits on its own, separated by the rule. Background stays plain; the numbers carry the scene.
3. Choreograph the line-by-line drop (input: layout → output: timing map)
   Total duration 5–9 seconds for 4–10 rows. Rows drop in one at a time, top to bottom, 500–700ms per row with a 150ms gap between rows. Each row drops from 12px above its resting position with a soft settle — the motion should feel like entries being written into a book, not objects falling from the sky. Deduction rows pause a beat longer (add 200ms) so the minus sign registers. The running subtotal updates on each row's landing, never during the drop.

Template preview

Cost Ledger Total — Starter Template

Fill in every {placeholder}. Check the addition twice before animating — the animation promises the numbers add up.

Ledger table (4–10 rows)

• Sort order: {largest first / order charges occur / other}
• Deductions (discounts / credits): {row #s} — each shown with a minus sign
• Total (checked twice): {sum of all rows incl. deductions} — [ ] addition verified

Layout

• Table: {ruled, labels left-aligned, amounts right-aligned, generous row height}
• Running subtotal readout: {top-right / beside table}
• Total row: {1.5× row type, own space below rule} · Background: {plain}

Timing map

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