new-data-source

new-data-source is a skill for Claude Code, Codex from jokull/icelandic-data. It costs 31 tokens per session (3,648 once invoked), scanned A, original, MIT.

A guide for connecting a new Icelandic public data source to a data-collection toolkit. It covers finding the source, checking how it works, writing the integration, and testing it.

In plain words
What is it for?
Use it to investigate an Icelandic data service, choose an extraction method, add a script and health check, and test the result.
Why use it?
It reduces the guesswork involved when a source has an unfamiliar API, dashboard, file format, or no API at all.

Skill for Claude CodeCodex

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/new-data-source
Any agent
npx skills add jokull/icelandic-data --skill new-data-source
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.

agentmods badge for new-data-source

README.md
[![agentmods](https://agentmods.dev/badge/skills/jokull/icelandic-data/new-data-source.svg)](https://agentmods.dev/skills/jokull/icelandic-data/new-data-source)
Your own site
<a href="https://agentmods.dev/skills/jokull/icelandic-data/new-data-source"><img src="https://agentmods.dev/badge/skills/jokull/icelandic-data/new-data-source.svg" alt="Measured on agentmods" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,648 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.

ModelPer sessionOnce invoked
Fable 5 $0.00031 $0.03648
Opus 5 $0.00015 $0.01824
Sonnet 5 $0.00006 $0.00730
Haiku 4.5 $0.00003 $0.00365

Measured 3d ago against content hash c73ac1c860f3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

new-data-source 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 3d 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 -s "https://{domain}/geoserver/wfs?service=WFS&request=GetCapabilities" | head -50
.agents/skills/new-data-source/SKILL.md · 353 lines

How it starts

The opening of the file, as written. The whole thing — 353 lines — stays where its author put it; the contents beside it link to each section on GitHub.

New Data Source — How to Learn and Integrate

Step-by-step methodology for adding a new Icelandic data source to this toolkit. Based on proven patterns from 20+ existing skills.

Phase 1: Discovery

Goal: Understand what the source offers before writing any code.

1.1 Find the API

Most Icelandic public data is served via one of these patterns:

Pattern Examples How to detect
REST/JSON API Hagstofan, UST (loftgæði) /api/ in URL, returns JSON
WFS (GeoServer) Vegagerðin, LMI geoserver in URL, ?service=WFS
PX-Web Hagstofan, Reykjavík .px files, POST with JSON query
Power BI embed Samgöngustofa, Ferdamálastofa app.powerbi.com/view?r= in page source
CKAN Reykjavík open data /api/3/action/ in URL
Static files (Excel/CSV) Seðlabanki Direct download links
Web scraping needed Skatturinn, Nasdaq No API — HTML pages, login flows

First moves:

# Check for WFS/WMS capabilities
curl -s "https://{domain}/geoserver/wfs?service=WFS&request=GetCapabilities" | head -50

# Check for REST API
curl -s "https://{domain}/api/" | jq .

# Check for CKAN
curl -s "https://{domain}/api/3/action/package_list" | jq '.result[:10]'

1.2 Probe the API

Once you know the type, enumerate what's available:

For WFS (GeoServer):

# List all layers
curl -s "{base}?service=WFS&version=2.0.0&request=GetCapabilities" 

# Fetch 3 features to inspect schema
curl -s "{base}?service=WFS&version=2.0.0&request=GetFeature&typeName={layer}&outputFormat=application/json&count=3&srsName=EPSG:4326"

For REST APIs:

# Hit the root/docs endpoint
curl -s "{base}/" | jq .

# Try common endpoint patterns
curl -s "{base}/stations" | jq '.[0]'
curl -s "{base}/data?limit=5" | jq .

For Power BI: read the powerbi skill and reuse scripts/powerbi.py. It already handles the embed token, the in-iframe query replay (a cold httpx client 401s — the grant is origin/session/rate-bound), and DSR decompression (skip it and you silently undercount). samgongustofa.py is the reference implementation to copy. Don't re-solve any of this by hand.

Read the full file on GitHub · 353 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.

  1. 3d ago First seen · 353 lines · 31 tokens per session scan A c73ac1c860f3

Subscribe to this mod's changes

new-data-source is a skill published in the GitHub repository jokull/icelandic-data (52 stars, last pushed 4d ago), licensed MIT. It adds 31 tokens to every session and 3,648 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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