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 agentmods add skills/jokull/icelandic-data/fuelnpx skills add jokull/icelandic-data --skill fuelgit clone --depth 1 https://github.com/jokull/icelandic-dataWrote 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/fuel)<a href="https://agentmods.dev/skills/jokull/icelandic-data/fuel"><img src="https://agentmods.dev/badge/skills/jokull/icelandic-data/fuel.svg" alt="Measured on agentmods" 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 | $0.00034 | $0.00957 |
| Opus 5 | $0.00017 | $0.00478 |
| Sonnet 5 | $0.00007 | $0.00191 |
| Haiku 4.5 | $0.00003 | $0.00096 |
Grade A, and why
fuel 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 5d 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 — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Fuel — Icelandic Fuel Market
Companies
| Retailer | Kennitala | Parent | Parent kt | Stations |
|---|---|---|---|---|
| N1 ehf. | 4110033370 |
Festi hf. | 5402062010 |
~100 |
| Olís ehf. | 5002693249 |
Hagar hf. | 6702032120 |
~65 |
| Orkan IS ehf. | 6803190730 |
Styrkás/SKEL | 6309212010 |
~75 |
| Atlantsolía ehf. | 5906023610 |
Private | — | ~30 |
Use parent kennitalas for consolidated financials — fuel is a segment within diversified conglomerates.
Skeljungur ehf. (6309212010) is the wholesale fuel company under Styrkás — separate from Orkan retail but same ownership.
Data Sources
Gasvaktin — Daily retail prices
- Repo: github.com/gasvaktin/gasvaktin
- Location:
data/raw/gasvaktin/vaktin/trends.json - Company codes:
n1=N1,ol=Olís,or=Orkan,ox=Orkan X,ao=Atlantsolía,co=Costco,dn=Dælan,ob=ÓB,sk=Skeljungur - Data since April 2016, ~weekly observations per company
Processing
uv run python scripts/fuel.py
Outputs:
data/processed/fuel_prices_daily.csv— all observationsdata/processed/fuel_market_daily.csv— market averages (major 4 retailers)data/processed/fuel_prices_monthly.csv— monthly by companydata/processed/fuel_price_spread.csv— price spread between retailers
Annual reports (skatturinn.is)
uv run python scripts/skatturinn.py download 5402062010 --year 2024 # Festi (N1 parent)
uv run python scripts/skatturinn.py download 6702032120 --year 2024 # Hagar (Olís parent)
uv run python scripts/skatturinn.py download 6309212010 --year 2024 # Skeljungur (Orkan wholesale)
Note: Festi has two reports per year (parent + consolidated). The download script picks typeid=1 first. For segment data, you may need the consolidated report (typeid=2).
Hagar fiscal year
Hagar uses Feb-Jan fiscal year (e.g., "2024" = Feb 2023 – Jan 2024).
Other data sources
- IEA End-Use Prices — cross-country fuel price comparison with tax breakdown
- Samkeppniseftirlitið — competition authority reports (2015 fuel market study, 2024 Festi fine)
- Crude oil prices — Brent ICE for margin computation
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.
- 5d ago First seen · 70 lines · 34 tokens per session scan A d61483ffe0a6
fuel is a skill published in the GitHub repository jokull/icelandic-data (52 stars, last pushed yesterday), licensed MIT. It adds 34 tokens to every session and 957 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 2026-08-30.
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