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.
git clone --depth 1 https://github.com/instructa/viber3dWrote 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/rules/instructa/viber3d/006-utils)<a href="https://agentmods.dev/rules/instructa/viber3d/006-utils"><img src="https://agentmods.dev/badge/rules/instructa/viber3d/006-utils/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/rules/instructa/viber3d/006-utils"><img src="https://agentmods.dev/badge/rules/instructa/viber3d/006-utils.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 | $0.00000 | $0.00186 |
| Opus 5.5 | $0.00000 | $0.00074 |
| Sonnet 5.5 | $0.00000 | $0.00037 |
| Haiku 4.5 | $0.00000 | $0.00019 |
Grade A, and why
006-utils 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 1mo 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
Koota Integration
- Access entity traits with
entity.get(Trait). - Handle missing traits gracefully, using null checks when necessary.
Three.js Usage
- Reuse math objects like
Vector3to reduce garbage collection. - Leverage built-in Three.js methods for transformations instead of reinventing them.
Performance
- Reuse arrays or buffers for spatial and geometry operations.
- Implement spatial partitioning (quadtrees, hash grids) for large worlds.
- Provide reset methods to avoid creating new data structures every frame.
Math Utilities
- Consolidate common math operations in concise functions.
- Ensure edge cases are handled (e.g. clamping, bounding conditions).
Documentation
- Add clear comments and note any adapted third-party code.
- Highlight performance considerations for complex or frequently used utilities.
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.
- 1mo ago First seen · 31 lines · 0 tokens per session scan A 20c921af70ca
006-utils is a cursor rule published in the GitHub repository instructa/viber3d (627 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 186 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 2026-08-30.
Other cursor rules, from other repositories
meta-quest-agentic-tools
Use Meta Quest Agentic Tools for Meta Quest and Horizon OS samples.
narrative-writing
A set of rules for writing and editing video-game narratives, connected to a narrative project. It requires the agent to load the project's writing context and story canon, which is the established set of story facts, before making changes.
meta-quest-agentic-tools
Use Meta Quest Agentic Tools for Meta Quest and Horizon OS samples.
visual-and-observational-rules
Defines the visual aspects of the game and how the player observes the world. This includes map color-coding, screen effects, and the overall simulation style.
00-project-overview
Base project rule — purpose, constraints, and defaults for mcp-5etools.
ponytail
Ponytail, lazy senior dev mode. Always pick the simplest solution that works.