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 iowarp/clio-kit --skill coordinate-systemsgit clone --depth 1 https://github.com/iowarp/clio-kitWrote 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/iowarp/clio-kit/coordinate-systems)<a href="https://agentmods.dev/skills/iowarp/clio-kit/coordinate-systems"><img src="https://agentmods.dev/badge/skills/iowarp/clio-kit/coordinate-systems/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/iowarp/clio-kit/coordinate-systems"><img src="https://agentmods.dev/badge/skills/iowarp/clio-kit/coordinate-systems.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 | $0.00053 | $0.01032 |
| Opus 5.5 | $0.00021 | $0.00413 |
| Sonnet 5.5 | $0.00011 | $0.00206 |
| Haiku 4.5 | $0.00005 | $0.00103 |
Grade A, and why
coordinate-systems 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 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.
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 — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Coordinate Systems
Nothing here raises an error. Data in the wrong reference system plots, computes distances, and returns bounding boxes — just in the wrong place. This is the class of bug that survives review because every step succeeded.
Longitude first, in GeoJSON
GeoJSON positions are [longitude, latitude]. Bounding boxes are
[min_lon, min_lat, max_lon, max_lat].
Almost everything a human writes is the other way round — "41.8, -87.6" for Chicago is lat, lon. Reversed coordinates near the equator land in the ocean off Africa; at mid-latitudes they land somewhere plausible-looking, which is worse.
Sanity check any position before trusting it: longitude is in [-180, 180], latitude in [-90, 90]. A first value beyond ±90 is definitely longitude. Both under 90 and it is ambiguous — check against a known landmark.
Geographic degrees are not a distance
Latitude and longitude are angles. One degree of latitude is about 111 km everywhere; one degree of longitude is 111 km at the equator, about 78 km at 45°, and zero at the pole.
So Euclidean distance on lon/lat is wrong, and wrong by a factor that changes with where you are. Compare two things at different latitudes with it and the comparison is meaningless.
clio-geo:filter_points_by_radius computes great-circle distance, which is
the correct thing on a sphere. Use it rather than differencing coordinates. When
clio-geo:bounding_box pads by buffer_km it is doing the same conversion; a
padded box is not a fixed number of degrees on every side.
Area is worse. A polygon's area in square degrees is not a physical quantity at all, and cannot be converted by one factor because the factor varies across the polygon.
Geographic versus projected
- Geographic (WGS84, EPSG:4326) — angles on the globe. What GPS and GeoJSON give you. Good for storing and sharing position, bad for measuring.
- Projected (UTM, State Plane, and so on) — linear coordinates (often metres, sometimes feet) on a plane, with controlled distortion within a defined zone and degrading outside it. Good for measuring, bad for spanning large areas.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 103 lines · 53 tokens per session scan A 1a8920d37d08
coordinate-systems is a skill published in the GitHub repository iowarp/clio-kit (30 stars, last pushed 8d ago), licensed BSD-3-Clause. It adds 53 tokens to every session and 1,032 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 2026-10-08.
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