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 nonlooped/roblox-suite --skill roblox-physicsgit clone --depth 1 https://github.com/nonlooped/roblox-suiteWrote 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/nonlooped/roblox-suite/roblox-physics)<a href="https://agentmods.dev/skills/nonlooped/roblox-suite/roblox-physics"><img src="https://agentmods.dev/badge/skills/nonlooped/roblox-suite/roblox-physics/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/nonlooped/roblox-suite/roblox-physics"><img src="https://agentmods.dev/badge/skills/nonlooped/roblox-suite/roblox-physics.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 | $0.00036 | $0.01784 |
| Opus 5.5 | $0.00014 | $0.00714 |
| Sonnet 5.5 | $0.00007 | $0.00357 |
| Haiku 4.5 | $0.00004 | $0.00178 |
Grade A, and why
roblox-physics 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.
How it starts
The opening of the file, as written. The whole thing — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.
roblox-physics
Official sources:
- https://create.roblox.com/docs/physics
- https://create.roblox.com/docs/physics/assemblies
- https://create.roblox.com/docs/physics/mechanical-constraints
- https://create.roblox.com/docs/physics/mover-constraints
- https://create.roblox.com/docs/physics/network-ownership
- https://create.roblox.com/docs/physics/sleep-system
- https://create.roblox.com/docs/physics/adaptive-timestepping
- https://create.roblox.com/docs/physics/units
- https://create.roblox.com/docs/workspace/collisions
Use mechanical constraints to connect parts and mover constraints to apply forces or velocity targets. For older code, use the BodyMover migration table below.
Core concepts
Assemblies
An assembly is one or more parts connected by rigid welds or movable joints, simulated as a single rigid body.
Key BasePart properties (same for any part in the assembly):
AssemblyLinearVelocity/AssemblyAngularVelocity: prefer constraints orApplyImpulseover direct assignment for realistic motion.AssemblyCenterOfMass: force here produces pure linear acceleration.AssemblyMass: sum of all part masses; infinite if any part is anchored.AssemblyRootPart: automatically chosen root for replication and network ownership.
Root-part priority: anchored > non-massless > higher RootPriority > size/name heuristics.
Anchoring
- Anchoring one part in an assembly makes it the root; the rest are implicitly anchored.
- Anchoring multiple parts in the same assembly splits it.
- To anchor an entire assembly, only anchor the root part.
Collision filtering
Use collision groups (Workspace:RegisterCollisionGroup (inherited from WorldRoot), BasePart.CollisionGroup) or NoCollisionConstraint for part-to-part filtering. CanCollide, CanTouch, and CanQuery control different behaviors; see references/collisions-and-filtering.md.
Mechanical constraints
All mechanical constraints connect one or two Attachments (or Bones), except WeldConstraint and NoCollisionConstraint which use Part0/Part1.
What ships with it
9 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.
- references/collisions-and-filtering.md 2.3 KB
- references/mechanical-constraints.md 4.0 KB
- references/mover-constraints.md 3.9 KB
- references/network-ownership.md 2.6 KB
- references/units-and-physical-properties.md 1.7 KB
- scripts/DoorHinge.lua 2.1 KB
- scripts/PlatformMover.lua 4.3 KB
- scripts/Suspension.lua 1.3 KB
- scripts/VehicleController.lua 6.0 KB
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 Changed · -14 lines · -57 tokens per session a954c7ded049
- 1mo ago First seen · 168 lines · 93 tokens per session scan A 42e881191e9f
roblox-physics is a skill published in the GitHub repository nonlooped/roblox-suite (23 stars, last pushed 3d ago), licensed MIT. It adds 36 tokens to every session and 1,784 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 2026-08-30.
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