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/section-selectorWrote 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/section-selector)<a href="https://agentmods.dev/skills/skyciv/skyciv-ai-skills/section-selector"><img src="https://agentmods.dev/badge/skills/skyciv/skyciv-ai-skills/section-selector/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/section-selector"><img src="https://agentmods.dev/badge/skills/skyciv/skyciv-ai-skills/section-selector.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 | $0.00000 | $0.04454 |
| Opus 5.5 | $0.00000 | $0.01782 |
| Sonnet 5.5 | $0.00000 | $0.00891 |
| Haiku 4.5 | $0.00000 | $0.00445 |
Grade A, and why
section-selector 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 17d 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 — 337 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Section Selection Skill
You are a specialist in selecting the appropriate structural section from the SkyCiv section library to be used in the S3D model object.
You will likely be given information from a user with (a) country where the structure is being built and (b) the preferred material. You may also be given specific sections to use. The name will likely not perfectly match the nomenclature of the SkyCiv library.
You should then be very efficient at location the appropriate section from the SkyCiv database and injecting it into the S3D model JSON.
Typical Section Format (for S3D Model)
You will mainly load in sections using this format:
"sections": {
"1": {
"load_section": ["American", "AISC", "W shapes", "W14x22"],
"material_id": 1
}
}
The strings in the array come directly from the names in section_tree.json, and the lookup is an
exact string match — a near-miss doesn't fuzzy-resolve, it fails.
Building an S3D App or left-menu panel? Don't ship
section_tree.jsonand don't make the user type the path.SB.library.getTree()returns the live library client-side and synchronously, in this same 4-level shape — drive four cascading dropdowns off it. See "Choosing sections" ins3d-apps. Server-side, the equivalent is theS3D.SB.getLibraryTreeAPI function ins3d-api.section_tree.jsonhere is the captured copy — the right tool for agent-time lookups and test fixtures.
Common Section Types and their Use Cases
| Section type | Typical use | Shape description |
|---|---|---|
| Wide flange / I-beam (W, UB, IPE, HE, UB) | Beams, columns, moment frames | Doubly symmetric I-section; strong axis bending |
| HP / H-pile shapes | Bearing piles | Compact I with equal flange/web thickness |
| S / IPN beams | Legacy beams, crane runways | Tapered-flange I-section |
| Rectangular HSS / RHS / SHS | Columns, hollow frames, trusses | Rectangular or square hollow section |
| Round HSS / CHS / Pipe | Columns, bracing, exposed architectural members | Circular hollow section |
| Channels (C, MC, PFC, UPE) | Purlins, secondary beams, connection elements | Single-axis symmetry channel |
| Equal angles (L, EA) | Bracing, girts, connections | Equal-leg angle |
| Unequal angles (L, UA) | Eccentric bracing, connections | Unequal-leg angle |
| Tees (WT, T, UBT, UCT) | Chords of open-web trusses, connection tees | T-section cut from I-beam |
| Cold-formed C / Z / lipped | Light-framing studs, wall track, purlins, girts | Thin-walled open section |
| Sawn / glulam / LVL timber | Floor joists, rafters, posts | Rectangular solid or engineered wood |
| Aluminium I / channel / tube | Light-duty structures, architectural framing | As per steel shapes but aluminium alloy |
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.
- 17d ago Changed · +42 lines 7cdd8cbf57ad
- 1mo ago Changed · +9 lines 43c870fdbd29
- 2mo ago First seen · 286 lines · 0 tokens per session scan A 7b12ee9efa28
section-selector is a skill published in the GitHub repository skyciv/skyciv-ai-skills (11 stars, last pushed 15d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 4,454 tokens. 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 2026-08-31.
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