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 tomcounsell/ai --skill mercury-invoicinggit clone --depth 1 https://github.com/tomcounsell/aiWrote 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/tomcounsell/ai/mercury-invoicing)<a href="https://agentmods.dev/skills/tomcounsell/ai/mercury-invoicing"><img src="https://agentmods.dev/badge/skills/tomcounsell/ai/mercury-invoicing/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/tomcounsell/ai/mercury-invoicing"><img src="https://agentmods.dev/badge/skills/tomcounsell/ai/mercury-invoicing.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 | $0.00067 | $0.01618 |
| Opus 5.5 | $0.00027 | $0.00647 |
| Sonnet 5.5 | $0.00013 | $0.00324 |
| Haiku 4.5 | $0.00007 | $0.00162 |
Grade A, and why
mercury-invoicing scanned grade A with 1 finding 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 2d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- **Checking a pay link.** The pay page is a single-page app: `curl` gets only the The source is not reproduced here
Licensed GPL-3.0
The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
What ships with it
1 file 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.
- 2d ago First seen · 100 lines · 67 tokens per session scan A d5264f5aa6cd
mercury-invoicing is a skill published in the GitHub repository tomcounsell/ai (29 stars, last pushed yesterday), licensed GPL-3.0. It adds 67 tokens to every session and 1,618 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-22.
Other skills, from other repositories
bills-and-subscriptions
Build and keep a list of your recurring charges: what each costs, how often, when it renews and how to cancel. Flags price rises, duplicates, trials about to start charging and things you no longer use, with a monthly total.
receipt-organizer
Turn a pile of receipts and invoices into a clean ledger and a tidy folder plan: who was paid, when, how much and what tax, with every figure traced to its file. Nothing is renamed or moved until you approve.
channel-updates
Send short, phone-first updates to the Commander on Telegram, Discord, Slack, Matrix or Signal — and know when a message should not be sent at all.
qa
Run scalable, isolated live QA for nac development. The top-level local orchestrator must parse n (default 4), dispatch one setup worker with this skill, copy its n assignment contracts verbatim into exactly n parallel test workers with this skill, then dispatch one aggregate worker with this skill using all test…
release
Cut and publish a full stable NAC release after main, release-PR, and publication CI pass. Use when a maintainer asks for a stable version bump, tag, or GitHub Release. Never use for release candidates; NAC RC releases are automated.
cashclaw-invoicer
Handles invoice creation, payment link generation, payment status tracking, and automated reminders via Stripe API. Supports multi-currency billing and recurring payments.