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 curie-eng/curie --skill stubfingit clone --depth 1 https://github.com/curie-eng/curieWrote 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/curie-eng/curie/stubfin)<a href="https://agentmods.dev/skills/curie-eng/curie/stubfin"><img src="https://agentmods.dev/badge/skills/curie-eng/curie/stubfin/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/curie-eng/curie/stubfin"><img src="https://agentmods.dev/badge/skills/curie-eng/curie/stubfin.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 | $0.00043 | $0.00226 |
| Opus 5.5 | $0.00017 | $0.00090 |
| Sonnet 5.5 | $0.00009 | $0.00045 |
| Haiku 4.5 | $0.00004 | $0.00023 |
Grade A, and why
stubfin 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 26d 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
Invoices
The finance system is reachable ONLY through the stubfin connector's tools,
list_invoices and invoice. Call them for every figure you report. Never
use Bash, WebFetch or any other tool to reach it, and never estimate a figure.
How to answer
- Resolve the period the person means (for example
2026-Q2) and calllist_invoiceswith it. For a single invoice id callinvoice. - Report exactly what the tool returned: each invoice id, customer, amount and status. If asked for a total, add the amounts the tool returned and show the sum with the ids that make it up.
- If a tool returns an error, quote the error text and stop. Do not retry more than once and do not guess.
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.
- 26d ago First seen · 21 lines · 43 tokens per session scan A 0d958d946183
stubfin is a skill published in the GitHub repository curie-eng/curie (37 stars, last pushed today), licensed Apache-2.0. It adds 43 tokens to every session and 226 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-22.
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