gamedev-physics SKILL.md skillA
gamedev-physics from ericrisco/rsc-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ericrisco/rsc-harness/gamedev-physics@git:20260729.8954115Pins git:20260729.8954115 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ericrisco/rsc-harness
- Path
skills/gamedev-physics/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260729.8954115, committed Jul 29, 2026
- First version recorded
- Jul 4, 2026
- Size
- 14,716 bytes
- Repository stars
- 236
- License
- MIT
Use when working with a game engine's physics — rigid bodies, colliders, collision layers and masks, character controllers, joints, forces versus impulses, raycasts and shapecasts, or when a simulation is unstable (tunnelling, jitter, missed overlaps). Covers the Godot, Unity and Unreal equivalents. NOT rendering or shader-driven visual jitter (that is `gamedev-shaders`), NOT navigation, pathfinding or navmesh (that is `gamedev-pathing`).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Game physics & collision Make bodies collide, move, and stay stable across Godot, Unity, and Unreal. This skill owns the mental model (body types, colliders, layers/masks, character controllers, joints, queries, determinism) and maps every concept onto each engine's real API. When physics "feels broken" — jitter, tunneling, sinking, ghost collisions — the cause is almost always one of: wrong body type, a layer/mask mismatch, or moving/integrating outside the fixed physics tick. Check those first. ## Version contract — read first (never emit these) | Engine | Target | Banned / deprecated | Use instead | | --- | --- | --- | --- | | **Godot** | 4.x | `move_and_slide(velocity, up, ...)` with arguments (that is Godot 3) | Godot 4 `move_and_slide()` takes **no args**; set the `velocity` property first | | Godot | 4.x | `KinematicBody2D/3D`, `RayShape`, `WorldMarginShape`, `linear_velocity *= delta` before `move_and_slide()` | `CharacterBody2D/3D`, `SeparationRayShape2D/3D`, `WorldBoundaryShape2D/3D`; `move_and_slide()` is already delta-scaled | …
Read the whole file at its exact version.
How to install
mdr add ericrisco/rsc-harness/gamedev-physics@sha256:85164aabe41fc8aaThe line at the top of this page pins the label git:20260729.8954115, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_kgdfc6kxxlan6bo5)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jul 4, 2026 and Jul 29, 2026, about one every 25 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260729.8954115 latest | 2026-07-29 | 8954115 | 14,716 B | A | view · diff |
| git:20260704.b011ac6 | 2026-07-04 | b011ac6 | 15,217 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14716 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
ericrisco/rsc-harness · 236 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_kgdfc6kxxlan6bo5 GET https://markdownregistry.com/api/v1/resolve?ref=ericrisco/rsc-harness/gamedev-physics GET https://markdownregistry.com/api/v1/blob/85164aabe41fc8aabc534ac4adc6e8419913b83f2ee1144d8f3311c9dc00f8e6
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.