A research skill for open geographic data from Iceland's Institute of Natural History. It covers habitat maps, species distributions, and geology published through downloadable files and map services for geographic information systems.

Use it to find or inspect Icelandic habitat, species, and geological map layers, including data served through WFS, WMS, and WCS services.

It makes Icelandic nature data easier to locate and query without manually searching map portals and service descriptions. It also identifies the relevant standards and coordinate system used by the datasets.

natt — Skill for Claude Code and Codex by jokull: A research skill for open geographic data from Iceland's…

Install

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.

agentmods

npx agentmods add skills/jokull/icelandic-data/natt

Any agent

npx skills add jokull/icelandic-data --skill natt

Clone the repo

git clone --depth 1 https://github.com/jokull/icelandic-data

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/jokull/icelandic-data/natt.svg)](https://agentmods.dev/skills/jokull/icelandic-data/natt)

Your own site

<a href="https://agentmods.dev/skills/jokull/icelandic-data/natt"><img src="https://agentmods.dev/badge/skills/jokull/icelandic-data/natt.svg" alt="Measured on agentmods" height="20"></a>

Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,480 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00042	$0.03480
Opus 5	$0.00021	$0.01740
Sonnet 5	$0.00008	$0.00696
Haiku 4.5	$0.00004	$0.00348

Measured 5d ago against content hash f55d4d99daf4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

natt 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 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -sS "https://gis.natt.is/geoserver/wms?service=WMS&version=1.1.1\

.agents/skills/natt/SKILL.md · 204 lines

How it starts

The opening of the file, as written. The whole thing — 204 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Náttúrufræðistofnun (NÍ) — Open data

Náttúrufræðistofnun Íslands (Icelandic Institute of Natural History) publishes habitat-type, species-distribution, and geological data as open data.

Public download portal: https://www.natt.is/is/midlun/opin-gogn/nidurhal-gagna
Habitat-map viewer: http://vistgerdakort.ni.is/
Map browser: https://kort.gis.is/mapview/
Reference monograph (Fjölrit 54, 2018): http://utgafa.ni.is/fjolrit/Fjolrit_54.pdf
Change-log between 1st and 3rd edition: http://utgafa.ni.is/kort/lysigogn/vg25r_3utg_breytingar.pdf
License: "Gögnin eru öllum opin" — open, no use restrictions.

OGC services

NÍ runs a GeoServer at https://gis.natt.is/geoserver/. It hosts both NÍ's own layers and several layers federated from LMI / Hagstofan / Skógræktin.

WFS GetCapabilities: https://gis.natt.is/geoserver/wfs?service=WFS&version=2.0.0&request=GetCapabilities
WMS GetCapabilities: https://gis.natt.is/geoserver/wms?service=WMS&version=1.3.0&request=GetCapabilities
WCS GetCapabilities: https://gis.natt.is/geoserver/wcs?service=WCS&version=2.0.1&request=GetCapabilities
All layers are published in EPSG:3057 (ISN93 / LCC Iceland).
WFS supports outputFormat=application/json (GeoJSON) and CQL filters via CQL_FILTER=….
WCS spells the workspace separator __, WMS/WFS spell it :. The same coverage is vistgerdir__ni_vg25r_3utg_lzw (WCS) and vistgerdir:ni_vg25r_3utg_lzw (WMS).

Vistgerðir á Íslandi (3. útgáfa, 1:25.000) — habitat types

Habitat types ("vistgerðir") are NÍ's national EUNIS-aligned classification. There are 64 land-, 17 freshwater-, and 24 coastal-shore habitat types, documented in Fjölrit 54.

The 3rd edition is a raster. The polygonised vector edition LMI_vektor:vistgerd was withdrawn in 2026 (see Caveats) — the surviving national-coverage publication is:

Service	Name	Notes
WCS coverage	`vistgerdir__ni_vg25r_3utg_lzw`	GeoTIFF, the fetchable one
WMS layer	`vistgerdir:ni_vg25r_3utg_lzw`	styled `vistgerdir:vistgerdakort_3utg`

Read the full file on GitHub · 204 lines

Changes

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 · 204 lines · 42 tokens per session scan A f55d4d99daf4

Subscribe to this mod's changes

natt is a skill published in the GitHub repository jokull/icelandic-data (52 stars, last pushed yesterday), licensed MIT. It adds 42 tokens to every session and 3,480 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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natt