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Get Started Free →Collect overdue invoices with a graduated escalation ladder — friendly nudge to firm notice to work-stop to final demand, each with send-ready wording and timing, plus the prevention terms that stop the next one. Use when asked my client hasn't paid me, write a payment reminder email, invoice is 60 days overdue what do I do, or client is ghosting my invoices. Produces the situation read, the escalation ladder with dates and verbatim messages, the work-stop decision point, and the payment terms t
.claude/skills/mohitagw15856-late-invoice-escalation/SKILL.md| Test case | Without → With | Effect | Δ tokens | Δ turns |
|---|---|---|---|---|
| case-09 | ✗→✓ | ▲ Improved | 82% | 0% |
| case-03 | ✗→✓ | ▲ Improved | 8% | 0% |
| case-07 | ✗→✓ | ▲ Improved | 57% | 0% |
| case-16 | ✗→✓ | ▲ Improved | 87% | 0% |
| case-21 | ✓→✗ | ▼ Worse | 85% | 0% |
Most late invoices are disorganization, not theft — which is why the ladder starts friendly and blames the invoice, not the client. But freelancers fail at both ends: waiting four months of "gentle bumps" that teach the client lateness is free, or going nuclear at day 35 and torching a recoverable relationship. This skill runs the graduated ladder — each rung dated, worded, and slightly firmer — with the two real decision points marked: when work stops, and when the relationship is already gone and only the money remains.
Ask for these if not provided:
Which failure mode the evidence suggests · what that changes about pace and tone]
| Rung | Date to send | Channel | Message (verbatim) | |---|---|---|---| Each message ready to paste · rungs already burned marked done]
Work-stop: trigger date and exact wording] · Final demand: date, total, named next step] · Payment-plan branch: if cash-crisis, the once-only offer]
Deposit %] before work starts · milestone billing over monthly-in-arrears · late-fee clause % per month, where lawful] · stop-work clause · for enterprise: PO + AP contact captured before work begins
> Late-fee enforceability, demand-letter form, and small-claims limits vary by jurisdiction — verify locally; for large amounts or a contract dispute, a lawyer's letter early can be cheaper than months of the ladder.
| Case | Status | Duration (ms) | Turns | Tokens | Tool calls | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Without | With | Δ | Without | With | Δ | Without | With | Δ | Without | With | Δ | ||
case-11 | pass→pass | 14,833 | 14,867 | +0% | 1 | 1 | 0% | 2,411 | 3,435 | +42% | 0 | 0 | — |
case-09 | fail→pass | 11,986 | 14,362 | +20% | 1 | 1 | 0% | 1,930 | 3,519 | +82% | 0 | 0 | — |
case-10 | pass→pass | 15,164 | 13,851 | -9% | 1 | 1 | 0% | 2,651 | 3,490 | +32% | 0 | 0 | — |
case-01 | fail→fail | 23,985 | 21,708 | -9% | 1 | 1 | 0% | 4,554 | 4,951 | +9% | 0 | 0 | — |
case-02 | fail→fail | 26,919 | 21,287 | -21% | 1 | 1 | 0% | 4,512 | 4,660 | +3% | 0 | 0 | — |
case-03 | fail→pass | 21,264 | 17,035 | -20% | 1 | 1 | 0% | 3,710 | 4,018 | +8% | 0 | 0 | — |
case-04 | pass→pass | 9,842 | 10,766 | +9% | 1 | 1 | 0% | 1,622 | 3,110 | +92% | 0 | 0 | — |
case-05 | pass→pass | 11,222 | 13,031 | +16% | 1 | 1 | 0% | 1,974 | 3,616 | +83% | 0 | 0 | — |
case-06 | pass→pass | 10,569 | 11,392 | +8% | 1 | 1 | 0% | 1,806 | 3,182 | +76% | 0 | 0 | — |
case-07 | fail→pass | 14,127 | 13,724 | -3% | 1 | 1 | 0% | 2,278 | 3,576 | +57% | 0 | 0 | — |
case-08 | pass→pass | 14,032 | 13,290 | -5% | 1 | 1 | 0% | 2,334 | 3,490 | +50% | 0 | 0 | — |
case-12 | pass→pass | 10,023 | 14,248 | +42% | 1 | 1 | 0% | 1,631 | 3,496 | +114% | 0 | 0 | — |
case-13 | pass→pass | 11,135 | 13,879 | +25% | 1 | 1 | 0% | 1,980 | 3,457 | +75% | 0 | 0 | — |
case-14 | pass→pass | 8,829 | 13,591 | +54% | 1 | 1 | 0% | 1,491 | 3,560 | +139% | 0 | 0 | — |
case-15 | pass→pass | 12,008 | 11,253 | -6% | 1 | 1 | 0% | 1,877 | 3,054 | +63% | 0 | 0 | — |
case-16 | fail→pass | 10,511 | 13,647 | +30% | 1 | 1 | 0% | 1,812 | 3,387 | +87% | 0 | 0 | — |
case-17 | pass→pass | 10,307 | 11,640 | +13% | 1 | 1 | 0% | 1,710 | 3,088 | +81% | 0 | 0 | — |
case-18 | fail→fail | 8,486 | 15,349 | +81% | 1 | 1 | 0% | 1,537 | 3,939 | +156% | 0 | 0 | — |
case-19 | fail→fail | 30,725 | 20,221 | -34% | 1 | 1 | 0% | 6,179 | 4,778 | -23% | 0 | 0 | — |
case-20 | fail→fail | 10,492 | 12,917 | +23% | 1 | 1 | 0% | 2,002 | 3,604 | +80% | 0 | 0 | — |
case-21 | pass→fail | 10,295 | 14,051 | +36% | 1 | 1 | 0% | 1,985 | 3,666 | +85% | 0 | 0 | — |
case-22 | pass→pass | 9,746 | 12,446 | +28% | 1 | 1 | 0% | 1,631 | 3,063 | +88% | 0 | 0 | — |
DecimalAI ran this skill against gemini-3.6-flash twice over the same eval suite — once with the skill loaded and once without — and compared the two runs case by case. 22 cases were attempted. The headline lift of +14 percentage points is the difference between those two pass rates over the 22 comparable cases. 1 case got worse with the skill loaded, and it is included in that figure.
Without the skill loaded, the model failed this case. With it loaded, the same prompt on the same model passed. This is one improved case from the latest verified run; every case, including any that regressed, is in the table above.
Other measured skills in the registry, with their headline benchmark lift.