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 nezolder/civil3d-mcp-roslyn --skill surface_elevationgit clone --depth 1 https://github.com/nezolder/civil3d-mcp-roslynWrote 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/nezolder/civil3d-mcp-roslyn/surface_elevation)<a href="https://agentmods.dev/skills/nezolder/civil3d-mcp-roslyn/surface_elevation"><img src="https://agentmods.dev/badge/skills/nezolder/civil3d-mcp-roslyn/surface_elevation/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/nezolder/civil3d-mcp-roslyn/surface_elevation"><img src="https://agentmods.dev/badge/skills/nezolder/civil3d-mcp-roslyn/surface_elevation.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 | $0.00016 | $0.00302 |
| Opus 5.5 | $0.00006 | $0.00121 |
| Sonnet 5.5 | $0.00003 | $0.00060 |
| Haiku 4.5 | $0.00002 | $0.00030 |
Grade A, and why
surface_elevation 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 28d 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.
What it actually says
Code Template
// Find the surface by name
Autodesk.Civil.DatabaseServices.Surface targetSurface = null;
foreach (ObjectId id in CivilDoc.GetSurfaceIds())
{
var s = Transaction.GetObject(id, OpenMode.ForRead) as Autodesk.Civil.DatabaseServices.Surface;
if (s != null && s.Name.Equals("SURFACE_NAME", StringComparison.OrdinalIgnoreCase))
{
targetSurface = s;
break;
}
}
if (targetSurface == null)
return new { error = "Surface not found" };
double x = 1000.0; // Replace with actual X
double y = 2000.0; // Replace with actual Y
double elevation = targetSurface.FindElevationAtXY(x, y);
return new {
surfaceName = targetSurface.Name,
x, y, elevation
};
Usage Notes
- Throws exception if the point is outside the surface boundary
- Coordinates must be in the drawing's coordinate system
- Works with both TIN and Grid surfaces
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.
- 28d ago First seen · 50 lines · 16 tokens per session scan A 135871e407e6
surface_elevation is a skill published in the GitHub repository nezolder/civil3d-mcp-roslyn (3 stars, last pushed today), licensed MIT. It adds 16 tokens to every session and 302 once invoked, about $0.0001 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 2026-09-04.
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