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 favcrm/mcp --skill favcrm-billing-commercegit clone --depth 1 https://github.com/favcrm/mcpWrote 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/favcrm/mcp/favcrm-billing-commerce)<a href="https://agentmods.dev/skills/favcrm/mcp/favcrm-billing-commerce"><img src="https://agentmods.dev/badge/skills/favcrm/mcp/favcrm-billing-commerce/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/favcrm/mcp/favcrm-billing-commerce"><img src="https://agentmods.dev/badge/skills/favcrm/mcp/favcrm-billing-commerce.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00031 | $0.00294 |
| Opus 5 | $0.00015 | $0.00147 |
| Sonnet 5 | $0.00006 | $0.00059 |
| Haiku 4.5 | $0.00003 | $0.00029 |
Grade A, and why
favcrm-billing-commerce 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 10d 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.
What it actually says
FavCRM Billing Commerce
Use this skill for invoices, payments, products, orders, promotions, subscriptions, overdue follow-up, payment reminders, and commerce operations.
Operating Rules
- Ground every invoice, order, subscription, or payment claim with FavCRM data.
- Use
favcrm tool listandfavcrm tool describe <name>before unfamiliar billing or commerce tools. - For plan, quota, permission, or upgrade questions, call
get_plan_status,check_plan_operation, andlist_plan_optionsbefore advising. Only callcreate_plan_upgrade_linkafter explicit user confirmation. - Treat refunds, voids, cancellations, payment recording, and subscription changes as sensitive mutations.
- Show count and 3-row preview before bulk billing actions.
- Use the comms approval flow for overdue reminders or payment chase messages.
Standard Flow
- Identify the customer, invoice, order, product, promotion, or subscription.
- Fetch the current record before proposing a change.
- Preview sensitive mutations and ask for explicit confirmation.
- For reminders, draft the message and request approval rather than sending directly.
- Report the resulting status and record IDs after confirmed writes.
Read references/billing-commerce-flows.md for concrete CLI patterns.
What ships with it
3 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.
- 10d ago First seen · 28 lines · 31 tokens per session scan A f7f1774f608b
favcrm-billing-commerce is a skill published in the GitHub repository favcrm/mcp (0 stars, last pushed 7d ago), licensed MIT. It adds 31 tokens to every session and 294 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 2026-08-31.
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