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 AlexeyPerov/Unity-Open-MCP --skill splinesgit clone --depth 1 https://github.com/AlexeyPerov/Unity-Open-MCPWrote 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/alexeyperov/unity-open-mcp/splines)<a href="https://agentmods.dev/skills/alexeyperov/unity-open-mcp/splines"><img src="https://agentmods.dev/badge/skills/alexeyperov/unity-open-mcp/splines.svg" alt="Measured on agentmods" 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 | $0.01606 |
| Opus 5 | $0.00000 | $0.00803 |
| Sonnet 5 | $0.00000 | $0.00321 |
| Haiku 4.5 | $0.00000 | $0.00161 |
Grade A, and why
splines 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 8d 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 — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Unity Open MCP — Splines Extension
Skill for AI agents driving the Unity Splines package (com.unity.splines) in a
Unity project through the unity-open-mcp MCP server.
This domain is embedded in the bridge and opt-in. Its tools compile in only when the project has
com.unity.splinesinstalled (the bridge sets theUNITY_OPEN_MCP_EXT_SPLINESdefine automatically — no manual scripting-define write). Its tool group is hidden fromListToolsuntil the connected session activates it.
Preconditions
- Unity Editor is open with the target project.
unity_open_mcp_pingreturnsconnected: true.- The project has
com.unity.splinesinstalled. Ifcapabilitiesreports thesplinesgroup asavailable: false, install the package and let the bridge recompile. - The
splinestool group is activated — callunity_open_mcp_manage_tools(action="activate", group="splines")before invoking anysplines_*tool. Fresh sessions start with two default-on groups (coreandgate-and-verify); activate the other groups you need on demand.
Tool prefix
All tools in this pack use unity_open_mcp_splines_*. Mutating tools accept the
standard paths_hint (the host's scene path) and run the full gate path;
read-only tools (splines_evaluate, splines_get_knots) are gate-free.
Vocabulary
A SplineContainer is a MonoBehaviour component that holds one or more
Spline objects. Each spline is an ordered list of BezierKnots — every
knot has a Position, Rotation, TangentIn, TangentOut, and a
TangentMode that controls how the tangents are computed:
- AutoSmooth — tangents auto-computed for a smooth curve through the knot (the most common choice).
- BezierSmooth — smooth, with adjustable tangent length.
- Broken — the two tangents are independent.
- Mirrored — the two tangents mirror each other across the knot.
- Linear — sharp corners (straight segments).
Canonical workflow: a path through points
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.
- 8d ago First seen · 128 lines · 0 tokens per session scan A c061f37ea1e1
splines is a skill published in the GitHub repository AlexeyPerov/Unity-Open-MCP (12 stars, last pushed 10d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,606 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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