What is bevy-skills copilot-instructions.md?

A set of instructions for GitHub Copilot when writing Bevy 0.19 game code, editing skills, or reviewing this repository. Bevy is a Rust framework for building games and interactive applications.

Use it when creating or reviewing Bevy systems, configuring Cargo features, placing game logic in schedules, or changing skills in the repository.

It keeps Copilot aligned with the project's required Bevy version, current APIs, scheduling rules, and repository guidance.

How chrisgliddon/bevy-skills configures GitHub Copilot

Reuse

Borrowing it

Nothing to install: this file belongs to chrisgliddon/bevy-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/chrisgliddon/bevy-skills/main/.github/copilot-instructions.md

Clone the repo

git clone --depth 1 https://github.com/chrisgliddon/bevy-skills

Made for: GitHub Copilot.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/chrisgliddon/bevy-skills/copilot-instructions.svg)](https://agentmods.dev/instructions/chrisgliddon/bevy-skills/copilot-instructions)

Your own site

<a href="https://agentmods.dev/instructions/chrisgliddon/bevy-skills/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/chrisgliddon/bevy-skills/copilot-instructions.svg" alt="Measured on agentmods" height="20"></a>

Per session 838 This file is loaded in full into every session.

When invoked 838 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00838	$0.00838
Opus 5	$0.00419	$0.00419
Sonnet 5	$0.00168	$0.00168
Haiku 4.5	$0.00084	$0.00084

Measured 6d ago against content hash bf4f44301200, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

bevy-skills copilot-instructions.md 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 6d 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.

.github/copilot-instructions.md · 57 lines

How it starts

The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GitHub Copilot — Bevy 0.19

Copilot does not load Agent Skills directly. This file mirrors the key rules so Copilot users in this repo still benefit.

When writing Bevy code

Bevy 0.19 only. Do not suggest older APIs except while explaining a migration. Specifically:
- Events use MessageWriter / MessageReader (not the older EventWriter / EventReader; double-check the migration skills when reviewing stale code).
- Resources are components; scene serialization uses WorldAsset / WorldAssetRoot and the bevy_world_serialization feature.
- Text styling uses FontSource and FontSize components.
- Required components use #[require(...)] on Component derives.
Feature collections. When configuring Cargo.toml, pick the right Bevy feature set: 2d, 3d, ui (high-level) or mid-level 2d_api, 3d_api, ui_api. See skills/bevy-cargo-features/SKILL.md.
Schedule placement. Frame-driven game/presentation logic goes in Update; fixed-step physics and deterministic simulation go in FixedUpdate. Render-world systems belong in Bevy's render schedules, not Update.
No unwrap() in systems. Bevy systems run every frame. Use let ... else or proper error propagation.
Bridge input into fixed ticks. Translate physical input after InputSystems, queue button transitions, accumulate relative motion, and drain both once on the first fixed tick. Carry held buttons/absolute axes to every tick.
Persist stable domain IDs. Save versioned DTOs, not Entity, dense runtime palette indices, catalog order, asset handles, or reflected ECS layout by default.

When editing skills in this repo

Read CLAUDE.md. The frontmatter rules, lint script, and tester-crate workflow apply to all agents, not just Claude.

Where to look

Topic	Skill
ECS basics	`skills/bevy-core-concepts/`
Rebindable input / gamepads / fixed bridge	`skills/bevy-input-actions/`
Deterministic and visual testing	`skills/bevy-testing/`
Components & required components	`skills/bevy-ecs-components/`
Queries & filters	`skills/bevy-ecs-queries/`
Systems, sets, run conditions	`skills/bevy-ecs-systems/`
0.18 → 0.19 breaks	`skills/bevy-migration-0-18-to-0-19/`
0.17 → 0.18 breaks	`skills/bevy-migration-0-17-to-0-18/`
Assets & custom loaders	`skills/bevy-assets/`, `skills/bevy-custom-assets/`
Save/load schemas and platform persistence	`skills/bevy-save-load/`
WASM + WebGPU	`skills/bevy-wasm-webgpu/`
Cameras	`skills/bevy-cameras/`
PBR / materials	`skills/bevy-pbr-materials/`
Renderer selection / custom passes	`skills/bevy-rendering/`
Diagnostics / tracing / render profiling	`skills/bevy-diagnostics-profiling/`
Physics / Rapier / collision queries	`skills/bevy-physics/`
Game accessibility / adaptive controllers	`skills/bevy-a11y/`
Audio / sinks / spatial / mixing	`skills/bevy-audio/`
Voxel data, meshing, and production runtime	`skills/bevy-voxel-data/`, `skills/bevy-voxel-pipeline/`, `skills/bevy-voxel-runtime/`

Read the full file on GitHub · 57 lines

Changes

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.

6d ago First seen · 57 lines · 838 tokens per session scan A bf4f44301200

Subscribe to this mod's changes

bevy-skills copilot-instructions.md is an instructions file published in the GitHub repository chrisgliddon/bevy-skills (11 stars, last pushed 11d ago), licensed MIT. It adds 838 tokens to every session, about $0.0042 per session on Opus 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 2026-08-31.

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bevy-skills: Instructions file for GitHub Copilot