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/skyciv/skyciv-ai-skillsnpx agentmods add skills/skyciv/skyciv-ai-skills/s3d-appsWrote 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/skyciv/skyciv-ai-skills/s3d-apps)<a href="https://agentmods.dev/skills/skyciv/skyciv-ai-skills/s3d-apps"><img src="https://agentmods.dev/badge/skills/skyciv/skyciv-ai-skills/s3d-apps/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/skyciv/skyciv-ai-skills/s3d-apps"><img src="https://agentmods.dev/badge/skills/skyciv/skyciv-ai-skills/s3d-apps.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 | $0.00061 | $0.10076 |
| Opus 5.5 | $0.00024 | $0.04030 |
| Sonnet 5.5 | $0.00012 | $0.02015 |
| Haiku 4.5 | $0.00006 | $0.01008 |
Grade D, and why
s3d-apps scanned grade D with 2 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 14d 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.
Sends data to an external URLmediumData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
fetch('https://api.skyciv.com/v3', { method: 'POST', Harvests environment variableshighData exfiltration
Enumerating or grepping the environment for keys collects credentials unrelated to what the mod says it does.
> an S3D App or left-menu panel. The root `CLAUDE.md` "collect credentials in the UI" tip is How it starts
The opening of the file, as written. The whole thing — 814 lines — stays where its author put it; the contents beside it link to each section on GitHub.
S3D Apps Agent
You are an agent that builds SkyCiv Apps — custom, embeddable mini-apps that run inside the SkyCiv Structural 3D (S3D) web application. Unlike the S3D.* HTTP API (server-side, called over the network — see skyciv-api-v3 / s3d-api), a SkyCiv App is client-side JavaScript + HTML that executes in the user's browser, inside an already-open S3D session, with direct synchronous access to the live model and viewport.
Relationship to other skills:
- The
s3d_modelobject an app reads and writes is the same schema documented in full in thes3d-apiskill (nodes, members, plates, sections, materials, supports, loads, load_combinations, settings, etc.). This skill does not repeat that schema — cross-references3d-apifor field-level detail on any object you're building.- No auth/session calls are needed here — the app runs inside a session the user already has open.
skyciv-api-v3's auth/session/envelope material does not apply.- This is distinct from the
rendererskill:rendererembeds a standalone, external 3D viewer in your own web page (fed by data fetched over the API). This skill builds a mini-app that lives inside the S3D application itself, using the model that's already loaded there.
What is a SkyCiv App?
A SkyCiv App is a draggable window registered inside S3D that renders your own HTML/CSS/JS and can read or mutate the currently open model, react to what the user has selected in the 3D view, and show notifications — all without any network calls. Good use cases:
- Bulk actions on the model — e.g. auto-apply design loads to all beams, or only to currently selected members.
- Parametric generators — e.g. a balustrade/stair/truss builder that turns a few inputs (and a couple of selected nodes) into generated nodes, members, plates, and loads.
- Model checks/automation — scan the model for issues and highlight the offending elements.
- Custom overlays — screenshot or annotate the current view for a report.
What ships with it
2 files 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.
- 14d ago Changed · +6 lines c72a8aefea00
- 16d ago Changed · +1 lines 49137e2541fa
- 17d ago Changed · +7 lines 6c42e9a70370
- 1mo ago Changed · +289 lines scan A → D e9c3379504c5
- 2mo ago First seen · 511 lines · 61 tokens per session scan A f6138b6249ea
s3d-apps is a skill published in the GitHub repository skyciv/skyciv-ai-skills (11 stars, last pushed 15d ago), licensed MIT. It adds 61 tokens to every session and 10,076 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it D with 2 findings (sends data to an external url, harvests environment variables). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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