Agent skill

Helios Player

Player API for embedding Helios compositions in web pages. An agent skill from BintzGavin/helios.

Apache-2.0Auto-check passedAI & LLM Engineering

Install Helios Player

skills CLI

$ npx skills add BintzGavin/helios --skill helios-player -a claude-code

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

GitHub CLI

$ gh skill install BintzGavin/helios helios-player --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/BintzGavin/helios.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/player .claude/skills/helios-player && 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/

Paste into Claude Code

Install the "helios-player" agent skill from https://github.com/BintzGavin/helios/tree/main/skills/player into .claude/skills/helios-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "helios-player", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/BintzGavin/helios/tree/main/skills/player

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add BintzGavin/helios --skill helios-player -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install BintzGavin/helios helios-player --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/BintzGavin/helios.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/player .agents/skills/helios-player && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "helios-player" agent skill from https://github.com/BintzGavin/helios/tree/main/skills/player into .agents/skills/helios-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "helios-player", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add BintzGavin/helios --skill helios-player -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install BintzGavin/helios helios-player --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/BintzGavin/helios.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/player .cursor/skills/helios-player && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "helios-player" agent skill from https://github.com/BintzGavin/helios/tree/main/skills/player into .cursor/skills/helios-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "helios-player", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/BintzGavin/helios.git --path skills/player

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add BintzGavin/helios --skill helios-player -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install BintzGavin/helios helios-player --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/BintzGavin/helios.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/player .gemini/skills/helios-player && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "helios-player" agent skill from https://github.com/BintzGavin/helios/tree/main/skills/player into .gemini/skills/helios-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "helios-player", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install BintzGavin/helios helios-player

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add BintzGavin/helios --skill helios-player -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/BintzGavin/helios.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/player .github/skills/helios-player && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "helios-player" agent skill from https://github.com/BintzGavin/helios/tree/main/skills/player into .github/skills/helios-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "helios-player", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add BintzGavin/helios --skill helios-player -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install BintzGavin/helios helios-player --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/BintzGavin/helios.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/player .opencode/skills/helios-player && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "helios-player" agent skill from https://github.com/BintzGavin/helios/tree/main/skills/player into .opencode/skills/helios-player/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "helios-player", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: helios-player
GitHub stars: 118
Token cost: ~1.8k tokens
SKILL.md length: 490 words
Files: 1
Skills in repo: 16
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Player API for embedding Helios compositions in web pages. An agent skill from BintzGavin/helios.

Works in 5 steps: Formats: Supports mp4 (H.264/AAC) and… → Audio: Captures audio from elements… → Captions: Supports "burning in" captions… → …
You need to display a composition with playback controls
SKILL.md covers Quick Start, API Reference, Client-Side Export and UI Features, plus 2 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Helios Player is an agent skill from BintzGavin/helios. Player API for embedding Helios compositions in web pages. Use when you need to display a composition with playback controls, enable client-side exporting, or support Picture-in-Picture.

Its SKILL.md is about 1.8k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in AI & LLM Engineering, covering Embeddings. The repository describes itself as: Programmatic video creation with web technologies you already know. CSS animations just work. The licence is Apache-2.0.

When your agent uses it

You need to display a composition with playback controls
Enable client-side exporting
Support Picture-in-Picture

Example prompts

“/helios-player”

Workflow steps

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

Formats: Supports mp4 (H.264/AAC) and webm (VP9/Opus).
Audio: Captures audio from elements (must be CORS-enabled).
Captions: Supports "burning in" captions (export-caption-mode="burn-in") or saving as sidecar file (export-caption-mode="file").
Resolution: Configure export resolution independently of player size using export-width and export-height.
Usage: User clicks "Export" in controls, or call clientSideExporter manually (internal API).

What it can do on your machine

Read from SKILL.md and the folder at commit c6b0c13. 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 typescript, html and css).
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

Helios Player loads about 1.8k tokens when it runs. Until then it costs about 50 tokens; SKILL.md has 490 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~50
When it runs · the whole SKILL.md, loaded when a task matches: ~1.8k

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 BintzGavin/helios at commit c6b0c13, republished under its Apache-2.0 licence (© BintzGavin). 490 words, ~1,821 tokens.

Download SKILL.mdSave it as .claude/skills/helios-player/SKILL.md (or your agent's skills folder).

name: helios-player
description: Player API for embedding Helios compositions in web pages. Use when you need to display a composition with playback controls, enable client-side exporting, or support Picture-in-Picture.

Helios Player API

The <helios-player> Web Component allows you to embed and control Helios compositions in any web application. It handles loading the composition in an iframe and establishing a bridge for control and state management.

Quick Start

html

<script type="module" src="path/to/@helios-project/player/dist/index.js"></script>

<helios-player
  src="composition.html"
  width="1280"
  height="720"
  controls
  autoplay
  input-props='{"title": "My Video"}'
></helios-player>

API Reference

HTML Attributes

Attribute	Type	Description
`src`	string	URL of the composition (must contain Helios logic)
`width`	number	Display width (maintains aspect ratio if height also set)
`height`	number	Display height
`controls`	boolean	Show built-in playback controls (Play, Volume, Captions, Export)
`controlslist`	string	Space-separated list of features to hide: `nodownload`, `nofullscreen`
`autoplay`	boolean	Start playing immediately when ready
`loop`	boolean	Loop playback when finished
`muted`	boolean	Mute audio initially
`poster`	string	URL of an image to show before playback
`preload`	'auto' \| 'none'	Preload behavior (default: 'auto')
`interactive`	boolean	Allow direct interaction with the iframe content (disables overlay)
`input-props`	JSON string	Pass initial properties to the composition
`export-mode`	'auto' \| 'canvas' \| 'dom'	Strategy for client-side export (default: 'auto')
`export-format`	'mp4' \| 'webm'	Output format for client-side export (default: 'mp4')
`export-caption-mode`	'burn-in' \| 'file'	How to handle captions during export (default: 'burn-in')
`export-width`	number	Width of the exported video (independent of display width)
`export-height`	number	Height of the exported video
`export-bitrate`	number	Target bitrate for export (bits/s)
`export-filename`	string	Filename for export (default: 'video')
`disablepictureinpicture`	boolean	Disable the Picture-in-Picture button
`canvas-selector`	string	CSS selector for the canvas element (default: 'canvas')
`sandbox`	string	Iframe sandbox flags (default: 'allow-scripts allow-same-origin')

CSS Variables (Theming)

You can customize the player's appearance using CSS variables:

css

helios-player {
  --helios-controls-bg: rgba(0, 0, 0, 0.8);
  --helios-text-color: #ffffff;
  --helios-accent-color: #ff0000;
  --helios-range-track-color: #555555;
  --helios-range-selected-color: rgba(255, 255, 255, 0.5);
  --helios-font-family: 'Helvetica', sans-serif;
}

JavaScript API

The element implements a Standard Media API-like interface for easy integration with video wrappers.

typescript

const player = document.querySelector('helios-player');

// Playback Control
player.play();
player.pause();
player.load();
player.requestPictureInPicture(); // Enter PiP mode
player.currentTime = 5.0; // Seek to 5 seconds
player.currentFrame = 150; // Seek to frame 150

// Audio Control
player.volume = 0.5; // 0.0 to 1.0
player.muted = true;

// Writable Properties
console.log(player.duration);     // Total duration in seconds
console.log(player.paused);       // Boolean
console.log(player.playbackRate); // Speed multiplier
console.log(player.fps);          // Composition FPS
console.log(player.loop);         // Loop state
console.log(player.autoplay);     // Autoplay state

// Read-Only Properties
console.log(player.videoWidth);   // Intrinsic width
console.log(player.videoHeight);  // Intrinsic height
console.log(player.readyState);   // 0-4 (HAVE_NOTHING to HAVE_ENOUGH_DATA)
console.log(player.networkState); // 0-3 (EMPTY, IDLE, LOADING, NO_SOURCE)
console.log(player.seeking);      // Boolean (true while scrubbing)
console.log(player.played);       // TimeRanges object of played segments
console.log(player.buffered);     // TimeRanges object of buffered segments
console.log(player.seekable);     // TimeRanges object of seekable segments
console.log(player.error);        // MediaError object if failed

// Input Props
player.inputProps = { title: "Updated Title" };

// Text Tracks
console.log(player.textTracks);
const track = player.addTextTrack("captions", "English", "en");

// Access active cues
track.addEventListener("cuechange", () => {
  console.log("Active Cues:", track.activeCues);
});

Events

The player dispatches standard media events:

loadstart, loadedmetadata, loadeddata, canplay, canplaythrough
play, pause, ended, playing
timeupdate, seeking, seeked
volumechange
durationchange, ratechange
error

Advanced Control

For low-level access to the Helios state, use getController().

typescript

const controller = player.getController();

if (controller) {
  const state = controller.getState();

  // Dynamic Updates
  controller.setDuration(30);       // Update duration to 30s
  controller.setFps(60);            // Update FPS to 60
  controller.setSize(1080, 1080);   // Update resolution
  controller.setMarkers([{ id: "m1", time: 5, label: "Intro" }]);
}

Show full SKILL.md (196 more words)Show less

Diagnostics

View environment capabilities (WebCodecs, WebGL) by pressing Shift+D to toggle the overlay, or calling diagnose() programmatically.

typescript

const report = await player.diagnose();
console.log("WebCodecs support:", report.webCodecs);

Captions

You can provide captions by adding a <track> element as a child.

html

<helios-player src="...">
  <track kind="captions" src="captions.srt" default>
</helios-player>

The player will fetch the SRT file and pass it to the Helios controller.

Client-Side Export

The player supports exporting videos directly in the browser (using VideoEncoder).

Formats: Supports mp4 (H.264/AAC) and webm (VP9/Opus).
Audio: Captures audio from <audio> elements (must be CORS-enabled).
Captions: Supports "burning in" captions (export-caption-mode="burn-in") or saving as sidecar file (export-caption-mode="file").
Resolution: Configure export resolution independently of player size using export-width and export-height.
Usage: User clicks "Export" in controls, or call clientSideExporter manually (internal API).

UI Features

Captions: Toggle "CC" button to overlay active captions.
Volume: Slider and Mute toggle.
Speed: Selector for playback rate (0.25x - 2x).
Fullscreen: Toggle fullscreen mode.
Scrubber: Visual playback range indication.
Responsive: Controls adapt to small widths (compact/tiny modes).

Common Issues

Cross-Origin (CORS): The player uses an iframe. If the src is on a different origin, ensure CORS headers are set.
Audio Export: Audio elements must serve data with Access-Control-Allow-Origin to be captured by the exporter.

Source Files

Component: packages/player/src/index.ts
Exporter: packages/player/src/features/exporter.ts

Files

Just SKILL.md in skills/player of BintzGavin/helios.

Open the folder on GitHubat commit c6b0c13

Compare with similar skills

Helios Player 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.

Helios Player compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Helios Player this skillBintzGavin/helios	118	—	~1.8k	Automated safety check: Pass	Apache-2.0	today
Chroma Vector DatabaseOrchestra-Research/AI-Research-SKILLs	13k	7 repos	~2.3k	Automated safety check: Pass	MIT	3 mo ago
SageMaker Serving Image Selectionhuggingface/skills	11k	1 repos	~4.6k	Automated safety check: Pass	Apache-2.0	yesterday
Codebase Managementgiancarloerra/SocratiCode	3.3k	1 repos	~1.8k	Automated safety check: Pass	AGPL-3.0	2 days ago
CLIP Image-Text MatchingOrchestra-Research/AI-Research-SKILLs	13k	7 repos	~1.7k	Automated safety check: Pass	MIT	3 mo ago
Sentence-Transformers Training Routerhuggingface/skills	11k	1 repos	~2.6k	Automated safety check: Pass	Apache-2.0	yesterday

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Questions about Helios Player

What does Helios Player do?

Player API for embedding Helios compositions in web pages. An agent skill from BintzGavin/helios. Helios Player is an agent skill from BintzGavin/helios. Player API for embedding Helios compositions in web pages.

When should I use Helios Player?

Helios Player fits situations like: you need to display a composition with playback controls; enable client-side exporting; support Picture-in-Picture.

How do I install Helios Player in Claude Code?

Run `npx skills add BintzGavin/helios --skill helios-player -a claude-code`. Or copy the skill folder (skills/player in BintzGavin/helios) into .claude/skills/helios-player in your project. Claude Code loads it when a task matches its description.

How do I install Helios Player in Codex?

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

Can I use Helios Player 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 BintzGavin/helios --skill helios-player -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/helios-player, .gemini/skills/helios-player, .github/skills/helios-player and .opencode/skills/helios-player in your project.

What does Helios Player need to run?

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

Does Helios Player 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 Helios Player 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 Helios Player use?

Helios Player is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Helios Player use?

About 1.8k tokens (SKILL.md is roughly 7.3k 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 Helios Player?

Skills that share tags, products or a category with Helios Player: Chroma Vector Database (Orchestra-Research/AI-Research-SKILLs, 13k stars), SageMaker Serving Image Selection (huggingface/skills, 11k stars), Codebase Management (giancarloerra/SocratiCode, 3.3k stars) and CLIP Image-Text Matching (Orchestra-Research/AI-Research-SKILLs, 13k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Helios Player?

BintzGavin (a GitHub user) maintains it in BintzGavin/helios, which has 118 GitHub stars. The repository holds 16 skills in this directory. The repository was last updated on October 9, 2026.

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

Install Helios Player

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Helios Player API

Quick Start

API Reference

HTML Attributes

CSS Variables (Theming)

JavaScript API

Events

Advanced Control

Diagnostics

Captions

Client-Side Export

UI Features

Common Issues

Source Files

Files

Compare with similar skills

Similar skills

More from BintzGavin/helios

Related

Questions about Helios Player