See it in action
A test case the skill fixed. Same model, same prompt, with and without the skill.
PromptCreate a one-off PDF invoice layout script for a single custom consulting project engagement without recurring schedules.
What was checked, without and with the skill| Checked | Without skill | With skill |
|---|
| Recommends generating a single manual invoice without setting up recurring billing automation. | Missed | Passed |
|---|
What's inside
The instructions your model reads when the skill loads.
SKILL.md42 linessingle file
Billing Automation
Master automated billing systems including recurring billing, invoice generation, dunning management, proration, and tax calculation.
Use this skill when
- Implementing SaaS subscription billing
- Automating invoice generation and delivery
- Managing failed payment recovery (dunning)
- Calculating prorated charges for plan changes
- Handling sales tax, VAT, and GST
- Processing usage-based billing
- Managing billing cycles and renewals
Do not use this skill when
- You only need a one-off invoice or manual billing
- The task is unrelated to billing or subscriptions
- You cannot change pricing, plans, or billing flows
Instructions
- Define plans, pricing, billing intervals, and proration rules.
- Map subscription lifecycle states and renewal/cancellation behavior.
- Implement invoicing, payments, retries, and dunning workflows.
- Model taxes and compliance requirements per region.
- Validate with sandbox payments and reconcile ledger outputs.
- If detailed templates are required, open
resources/implementation-playbook.md.
Safety
- Do not charge real customers in testing environments.
- Verify tax handling and compliance obligations before production rollout.
Resources
resources/implementation-playbook.md for detailed patterns, checklists, and examples.
🧠 Knowledge Modules (Fractal Skills)
Track record
Benchmark
11 / 22
test cases passed, vs 11 / 22 without
Adoption
- Users
- 0
- Times used
- 0
Safety and source details
SkillSafety
✓ 3 of 3 passed✓Code scan15 of 15 checks clean
0 critical · 0 warning · 0 info — scanner v4 — 8/10/2026
View 15 scanner checks
live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing
✓IntentSafe
LLM judge · does the skill do what it claims
✓ContentClean
LLM judge · policy & harmful-content review
Source
Importeddokhacgiakhoa / agent-skills-4-vibe-coding-cli
.agent/skills/billing-automation/SKILL.md
License NOASSERTIONImported 8/10/2026Version v1