Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/jokull/icelandic-datanpx agentmods add skills/jokull/icelandic-data/opnirreikningarWrote 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/jokull/icelandic-data/opnirreikningar)<a href="https://agentmods.dev/skills/jokull/icelandic-data/opnirreikningar"><img src="https://agentmods.dev/badge/skills/jokull/icelandic-data/opnirreikningar/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/jokull/icelandic-data/opnirreikningar"><img src="https://agentmods.dev/badge/skills/jokull/icelandic-data/opnirreikningar.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 | $0.00036 | $0.01558 |
| Opus 5 | $0.00018 | $0.00779 |
| Sonnet 5 | $0.00007 | $0.00312 |
| Haiku 4.5 | $0.00004 | $0.00156 |
Grade A, and why
opnirreikningar 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 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl 'https://opnirreikningar.is/rest/org?term=veg' How it starts
The opening of the file, as written. The whole thing — 150 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Opnir Reikningar — Government Invoice Data
Overview
opnirreikningar.is publishes paid invoices from Icelandic government agencies (ministries, directorates). No auth required.
Scope: Paid invoices with org, vendor, amount, date, invoice number. Monthly updates (~10th of following month). Coverage: 2017–present.
Excludes: Salaries, foreign currency transactions, benefits, healthcare provider payments, prisoner payments, security operations. No municipality data — central government only.
API Endpoints
Base URL: https://opnirreikningar.is
1. Invoice Search (DataTables pagination)
GET /data_pagination_search?vendor_id=&type_id=&org_id=14412&timabil_fra=01.01.2025&timabil_til=31.01.2025&draw=1&columns[0][data]=org_name&columns[1][data]=check_date&columns[2][data]=vendor_name&columns[3][data]=invoice_amount&columns[4][data]=check_amount&start=0&length=500&order[0][column]=1&order[0][dir]=desc
Required headers: X-Requested-With: XMLHttpRequest, Accept: application/json
Optional: org_text=<id> - <name> (URL-encoded) when filtering by org
Key: Only abbreviated column spec needed (columns[N][data]=<name>) — full DataTables sub-params are not required. The draw, order, and 5-column layout are required.
Response:
{
"draw": 1,
"data": [
{
"org_name": "Veðurstofa Íslands",
"check_date": "2025-01-31",
"check_amount": 507706,
"vendor_name": "Síminn hf.",
"invoice_num": "12345",
"invoice_date": "2025-01-15",
"invoice_description": "",
"invoice_amount": 507706,
"check_id": 18048834,
"invoice_id": 22050869,
"unique_id": "18048834_22050869",
"attachments": 0
}
]
}
Pagination: No recordsTotal — paginate with start param (increment by length) until data: [].
Date params: DD.MM.YYYY (input), but response dates are ISO YYYY-MM-DD. Amounts are integers (ISK).
2. Autocomplete
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 · 150 lines · 36 tokens per session scan A 73591c1d0b5b
opnirreikningar is a skill published in the GitHub repository jokull/icelandic-data (52 stars, last pushed today), licensed MIT. It adds 36 tokens to every session and 1,558 once invoked, about $0.0002 per session on Opus 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 2026-08-30.
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