OpenClaw Master Skills is a curated, regularly updated collection of skills that extends an AI personal assistant platform with capabilities such as research, browser automation, presentation creation, and prompt work. It is intended for people using OpenClaw or MyClaw.ai to give their agents additional tasks and workflows. The catalogue contains many skills and agents from this collection.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add LeoYeAI/openclaw-master-skills --skill afrexai-invoice-enginegit clone --depth 1 https://github.com/LeoYeAI/openclaw-master-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/leoyeai/openclaw-master-skills/afrexai-invoice-engine)<a href="https://agentmods.dev/skills/leoyeai/openclaw-master-skills/afrexai-invoice-engine"><img src="https://agentmods.dev/badge/skills/leoyeai/openclaw-master-skills/afrexai-invoice-engine/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/leoyeai/openclaw-master-skills/afrexai-invoice-engine"><img src="https://agentmods.dev/badge/skills/leoyeai/openclaw-master-skills/afrexai-invoice-engine.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00044 | $0.04432 |
| Opus 5 | $0.00022 | $0.02216 |
| Sonnet 5 | $0.00009 | $0.00886 |
| Haiku 4.5 | $0.00004 | $0.00443 |
Grade A, and why
afrexai-invoice-engine scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 520 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Invoice Engine — Complete Invoicing & Accounts Receivable
A zero-dependency agent skill for end-to-end invoicing — from quote to payment to reporting.
Quick Start
When the user says "create an invoice" or "bill [client]":
- Check if client exists in memory (see Client Registry below)
- If new client → run Client Onboarding
- Generate invoice using the Invoice Builder
- Present for review → finalize
- Track in the Invoice Ledger
1. Client Registry
Maintain a YAML client database in your workspace:
# clients.yaml
clients:
- id: "CLI-001"
name: "Acme Corp"
contact: "Jane Smith"
email: "[email protected]"
address:
line1: "123 Business Ave"
line2: "Suite 400"
city: "New York"
state: "NY"
zip: "10001"
country: "US"
tax_id: "US-EIN-12-3456789"
payment_terms: "net-30" # net-15, net-30, net-45, net-60, due-on-receipt, custom
preferred_currency: "USD"
default_tax_rate: 0 # 0 for B2B cross-border, local rate for domestic
notes: "PO required for invoices > $5,000"
created: "2026-01-15"
lifetime_revenue: 12500.00
invoices_sent: 3
invoices_paid: 2
avg_days_to_pay: 22
Client Onboarding Checklist
When adding a new client, collect:
- Legal entity name (exactly as on their records)
- Billing contact name + email
- Billing address (full, with country)
- Tax ID / VAT number (if applicable)
- Preferred payment terms
- Currency preference
- Any PO or approval requirements
- Tax-exempt? (if so, get certificate reference)
2. Invoice Builder
Invoice Number Format
[PREFIX]-[YEAR].[MONTH].[SEQUENCE]
Example: INV-2026.02.001
Configurable prefix per business line:
INV= standard invoicePRO= proforma / quoteREC= recurring invoiceCN= credit note
Invoice Template
When generating an invoice, structure it as:
╔══════════════════════════════════════════════════════════╗
║ [YOUR COMPANY NAME] ║
║ [Address Line 1] ║
║ [City, State ZIP] ║
║ [Country] ║
║ Tax ID: [YOUR TAX ID] ║
╠══════════════════════════════════════════════════════════╣
║ ║
║ INVOICE [NUMBER] Date: [ISSUE DATE] ║
║ Due: [DUE DATE] ║
║ ║
║ Bill To: Payment Terms: ║
║ [CLIENT NAME] [Net-30 / etc.] ║
║ [Client Address] ║
║ [City, State ZIP] PO Number: ║
║ Tax ID: [CLIENT TAX ID] [If applicable] ║
║ ║
╠══════════════════════════════════════════════════════════╣
║ # │ Description │ Qty │ Rate │ Amount ║
╠═════╪══════════════════════╪═════╪═════════╪════════════╣
║ 1 │ [Service/Product] │ 1 │ $X,XXX │ $X,XXX.XX ║
║ 2 │ [Service/Product] │ 3 │ $XXX │ $X,XXX.XX ║
║ 3 │ [Expense passthrough]│ 1 │ $XXX │ $XXX.XX ║
╠═════╧══════════════════════╧═════╧═════════╧════════════╣
║ Subtotal: $XX,XXX.XX ║
║ Discount: -$X,XXX.XX ║
║ Tax (X%): $X,XXX.XX ║
║ ───────────────────────── ║
║ TOTAL DUE: $XX,XXX.XX ║
╠══════════════════════════════════════════════════════════╣
║ Payment Methods: ║
║ • Bank Transfer: [Bank] | Acct: [XXXX] | Routing: [XX] ║
║ • PayPal: [email] ║
║ • Stripe: [payment link] ║
║ • Bitcoin: [address] / Lightning: [LNURL] ║
║ ║
║ Notes: [Custom message / thank you / late fee notice] ║
╚══════════════════════════════════════════════════════════╝
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 520 lines · 44 tokens per session scan A 4d44e96d5145
afrexai-invoice-engine is a skill published in the GitHub repository LeoYeAI/openclaw-master-skills (2,141 stars, last pushed 1mo ago), licensed MIT. It adds 44 tokens to every session and 4,432 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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