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Agent skill

Bevy Systems

by nolantait in nolantait/bevy-starter

Reference for Bevy systems — scheduling, ordering, system parameters, ParamSet, exclusive systems, fallibility, custom system params, and run conditions.

MITAuto-check passed

Install Bevy Systems

skills CLI
$ npx skills add nolantait/bevy-starter --skill bevy-systems -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install nolantait/bevy-starter bevy-systems --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/nolantait/bevy-starter.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/bevy-systems .claude/skills/bevy-systems && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
bevy-systems
GitHub stars
132
Token cost
~1k tokens
SKILL.md length
280 words
Files
1
Skills in repo
24
Repo updated
First seen
Licence
MIT

At a glance

Reference for Bevy systems — scheduling, ordering, system parameters, ParamSet, exclusive systems, fallibility, custom system params, and run conditions.

  • Works in 3 steps: Update — runs once every loop → FixedUpdate — runs once every fixed… → Startup — runs once at startup
  • SKILL.md covers System basics, Scheduling, Ordering and Custom system sets, plus 8 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Bevy Systems is an agent skill from nolantait/bevy-starter. Reference for Bevy systems — scheduling, ordering, system parameters, ParamSet, exclusive systems, fallibility, custom system params, and run conditions.

Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: A minimalist starter for bevy and rust. The licence is MIT.

Example prompts

  • “/bevy-systems”

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. Update — runs once every loop
  2. FixedUpdate — runs once every fixed amount of time
  3. Startup — runs once at startup

What it can do on your machine

Read from SKILL.md and the folder at commit dd6f56b. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are rust).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Bevy Systems loads about 1k tokens when it runs. Until then it costs about 42 tokens; SKILL.md has 280 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~42
When it runs · the whole SKILL.md, loaded when a task matches
~1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from nolantait/bevy-starter at commit dd6f56b, republished under its MIT licence (© nolantait). 280 words, ~1,046 tokens.

Download SKILL.mdSave it as .claude/skills/bevy-systems/SKILL.md (or your agent's skills folder).
name
bevy-systems
description
Reference for Bevy systems — scheduling, ordering, system parameters, ParamSet, exclusive systems, fallibility, custom system params, and run conditions.
metadata.crate
bevy_ecs
metadata.bevy
0.19

System basics

A system is a Rust function whose parameters all implement SystemParam. Bevy auto-converts via IntoSystem.

rust
fn hello() { println!("Hello!"); }

Scheduling

rust
app.add_systems(Update, hello);
app.add_systems(Update, (defend, attack));
Schedule labels

Main labels:

  1. Update — runs once every loop
  2. FixedUpdate — runs once every fixed amount of time
  3. Startup — runs once at startup

Other built-in labels, in order:

  1. PreStartup
  2. Startup
  3. PostStartup
  4. First
  5. PreUpdate
  6. StateTransition
  7. RunFixedMainLoop — runs the FixedMain schedules including FixedUpdate
  8. Update
  9. SpawnScene
  10. PostUpdate
  11. Last

Each label identifies a Schedule, which holds the metadata and executor needed to run its systems. Bevy tries to run systems in parallel unless they have conflicting mutable data access; archetypes optimize this.

Commands queue into a CommandQueue and are applied at a sync point: an ApplyDeferred system that Bevy inserts after command-producing systems that others depend on, as well as at the end of every schedule.

Ordering

rust
// before/after
app.add_systems(Update, (defend.before(end_turn), attack.after(defend), end_turn));

// chain (sequential)
app.add_systems(Update, (defend, attack, end_turn).chain());

Custom system sets

rust
#[derive(SystemSet, Debug, Clone, PartialEq, Eq, Hash)]
struct PhysicsSet;

app.add_systems(Update, (move_objects, collide).in_set(PhysicsSet));
app.configure_sets(Update, (PhysicsSet, EconomySet).chain());

Common system parameters

ParamDescription
Res<T> / ResMut<T>Read/write resource
Query<D, F>Query components
CommandsQueue world mutations
Local<T>Per-system persistent state
ParamSet<(P0, P1)>Mutually-exclusive params
&WorldExclusive world access
MessageReader<T> / MessageWriter<T>Read/write messages
NonSend<T> / NonSendMut<T>Non-Send resource

ParamSet

For two queries that would conflict (same mutable component):

rust
fn good(mut set: ParamSet<(Query<&mut Health, With<Enemy>>, Query<&mut Health, With<Ally>>)>) {
  for mut h in set.p0().iter_mut() { }
  for mut h in set.p1().iter_mut() { }  // p0 is no longer borrowed
}

Fallibility

Return Result to make a system failable:

rust
fn failable() -> Result<()> { Ok(()) }

Set global error handler:

rust
GLOBAL_ERROR_HANDLER.set(warn).unwrap();

Built-in handlers: panic, error, warn, info, debug, trace, ignore.

Fallible system params (skip system on validation failure)
ParamSkipped when
Single<D, F>Not exactly one match
Option<Single<D, F>>More than one match
Populated<D, F>No matches
Res<T> / ResMut<T>Resource doesn't exist (calls error handler)

Custom system parameters

rust
#[derive(SystemParam)]
struct PlayerCounter<'w, 's> {
  players: Query<'w, 's, &'static Player>,
  count: ResMut<'w, PlayerCount>,
}
impl PlayerCounter<'_, '_> {
  fn count(&mut self) { self.count.0 = self.players.iter().len(); }
}

System state (Local)

rust
fn count_calls(mut counter: Local<u32>) {
  *counter += 1;
  println!("Called {} times", *counter);
}

Exclusive systems

Use &mut World for immediate (non-deferred) access:

rust
fn exclusive(world: &mut World) {
  world.spawn(Player);
}

Cannot run in parallel with other systems that need &mut World.

Piping systems

rust
fn parse(input: In<String>) -> usize { input.len() }
fn show(len: In<usize>) { info!("length: {}", len); }
app.add_systems(Update, parse.pipe(show));

Removing systems

rust
schedule.remove_systems_in_set(MySystem, ScheduleCleanupPolicy::RemoveSystemsOnly);
app.remove_systems_in_set(MySet, ScheduleCleanupPolicy::RemoveSetAndSystems);

© nolantait, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/bevy-systems of nolantait/bevy-starter.

Open the folder on GitHubat commit dd6f56b

Compare with similar skills

Bevy Systems next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Bevy Systems compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Bevy Systems this skillnolantait/bevy-starter132—~1kAutomated safety check: PassMIT
Scheduleasgeirtj/system_prompts_leaks69k—~2.9kAutomated safety check: PassCC0-1.0
Scheduleasgeirtj/system_prompts_leaks69k—~597Automated safety check: PassCC0-1.0
Cron Scheduleruvnet/ruflo74k—~257Automated safety check: PassMIT
Parametersthedaviddias/Front-End-Checklist74k—~638Automated safety check: PassMIT
Schedulingasgeirtj/system_prompts_leaks69k—~1.4kAutomated safety check: PassCC0-1.0

Similar skills

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    asgeirtj/system_prompts_leaks

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    69k GitHub stars~2.9k tokensUpdated yesterday
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  • Scheduling

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More from nolantait/bevy-starter

All 24 skills in this repo

  • Bevy Events

    nolantait/bevy-starter

    Reference for events, messages, and observers in Bevy — Message/MessageReader/MessageWriter, Event/EntityEvent, triggers, observers, and propagation.

    132 GitHub stars~867 tokensUpdated today
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  • Avian

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    132 GitHub stars~3k tokensUpdated today
    Auto-check passed

  • Bevy Assets

    nolantait/bevy-starter

    Reference for loading, managing, and tracking assets in Bevy — AssetServer, handles, loading states, events, custom loaders, and hot reloading.

    132 GitHub stars~871 tokensUpdated today
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  • Bevy Audio

    nolantait/bevy-starter

    Reference for playing and controlling audio in Bevy — AudioPlayer, AudioSink, spatial audio, volume, and playback settings.

    132 GitHub stars~713 tokensUpdated today
    Auto-check passed

  • Bevy Bsn

    nolantait/bevy-starter

    Reference for Bevy Scene Notation (BSN) — the bsn!. An agent skill from nolantait/bevy-starter.

    132 GitHub stars~1.1k tokensUpdated today
    Auto-check passed

  • Bevy Cameras

    nolantait/bevy-starter

    Reference for cameras in Bevy — Camera2d, Camera3d, viewports, projection, render layers, mouse-to-world, and free camera controllers.

    132 GitHub stars~976 tokensUpdated today
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Questions about Bevy Systems

What does Bevy Systems do?

Reference for Bevy systems — scheduling, ordering, system parameters, ParamSet, exclusive systems, fallibility, custom system params, and run conditions. Bevy Systems is an agent skill from nolantait/bevy-starter. Reference for Bevy systems — scheduling, ordering, system parameters, ParamSet, exclusive systems, fallibility, custom system params, and run conditions.

How do I install Bevy Systems in Claude Code?

Run `npx skills add nolantait/bevy-starter --skill bevy-systems -a claude-code`. Or copy the skill folder (.agents/skills/bevy-systems in nolantait/bevy-starter) into .claude/skills/bevy-systems in your project. Claude Code loads it when a task matches its description.

How do I install Bevy Systems in Codex?

Run `npx skills add nolantait/bevy-starter --skill bevy-systems -a codex`. Or copy the skill folder (.agents/skills/bevy-systems in nolantait/bevy-starter) into .agents/skills/bevy-systems in your project. Codex loads it when a task matches its description.

Can I use Bevy Systems in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add nolantait/bevy-starter --skill bevy-systems -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/bevy-systems, .gemini/skills/bevy-systems, .github/skills/bevy-systems and .opencode/skills/bevy-systems in your project.

What does Bevy Systems need to run?

SKILL.md names no scripts, command-line tools or credentials: Bevy Systems is instructions for the agent only.

Does Bevy Systems access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Bevy Systems safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Bevy Systems use?

Bevy Systems is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Bevy Systems use?

About 1k tokens (SKILL.md is roughly 4.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Bevy Systems?

Skills that share tags, products or a category with Bevy Systems: Schedule (asgeirtj/system_prompts_leaks, 69k stars), Schedule (asgeirtj/system_prompts_leaks, 69k stars), Cron Schedule (ruvnet/ruflo, 74k stars) and Parameters (thedaviddias/Front-End-Checklist, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Bevy Systems?

nolantait (a GitHub user) maintains it in nolantait/bevy-starter, which has 132 GitHub stars. The repository holds 24 skills in this directory. The repository was last updated on October 8, 2026.

Source: nolantait/bevy-starter on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.