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Work with DiscordPHP's voice subsystem — voice gateway protocol opcodes, encryption (VoiceGroupCrypto), voice packets, audio streaming, and Discord.php voice integration.
MITAuto-check passed
Install Voice Subsystem Keeper
$ npx skills add discord-php/DiscordPHP --skill voice-subsystem-keeper -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install discord-php/DiscordPHP voice-subsystem-keeper --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/discord-php/DiscordPHP.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/voice-subsystem-keeper .claude/skills/voice-subsystem-keeper && rm -rf skills-srcUse ~/.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/
Install the "voice-subsystem-keeper" agent skill from https://github.com/discord-php/DiscordPHP/tree/master/.agents/skills/voice-subsystem-keeper into .claude/skills/voice-subsystem-keeper/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "voice-subsystem-keeper", 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 install https://github.com/discord-php/DiscordPHP/tree/master/.agents/skills/voice-subsystem-keeperType 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.
$ npx skills add discord-php/DiscordPHP --skill voice-subsystem-keeper -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install discord-php/DiscordPHP voice-subsystem-keeper --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/discord-php/DiscordPHP.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/voice-subsystem-keeper .agents/skills/voice-subsystem-keeper && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "voice-subsystem-keeper" agent skill from https://github.com/discord-php/DiscordPHP/tree/master/.agents/skills/voice-subsystem-keeper into .agents/skills/voice-subsystem-keeper/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "voice-subsystem-keeper", 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.
$ npx skills add discord-php/DiscordPHP --skill voice-subsystem-keeper -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install discord-php/DiscordPHP voice-subsystem-keeper --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/discord-php/DiscordPHP.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/voice-subsystem-keeper .cursor/skills/voice-subsystem-keeper && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "voice-subsystem-keeper" agent skill from https://github.com/discord-php/DiscordPHP/tree/master/.agents/skills/voice-subsystem-keeper into .cursor/skills/voice-subsystem-keeper/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "voice-subsystem-keeper", 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 https://github.com/discord-php/DiscordPHP.git --path .agents/skills/voice-subsystem-keeper--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add discord-php/DiscordPHP --skill voice-subsystem-keeper -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install discord-php/DiscordPHP voice-subsystem-keeper --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/discord-php/DiscordPHP.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/voice-subsystem-keeper .gemini/skills/voice-subsystem-keeper && rm -rf skills-srcUse ~/.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/
Install the "voice-subsystem-keeper" agent skill from https://github.com/discord-php/DiscordPHP/tree/master/.agents/skills/voice-subsystem-keeper into .gemini/skills/voice-subsystem-keeper/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "voice-subsystem-keeper", 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.
$ gh skill install discord-php/DiscordPHP voice-subsystem-keeperInstalls 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).
$ npx skills add discord-php/DiscordPHP --skill voice-subsystem-keeper -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/discord-php/DiscordPHP.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/voice-subsystem-keeper .github/skills/voice-subsystem-keeper && rm -rf skills-srcUse ~/.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/
Install the "voice-subsystem-keeper" agent skill from https://github.com/discord-php/DiscordPHP/tree/master/.agents/skills/voice-subsystem-keeper into .github/skills/voice-subsystem-keeper/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "voice-subsystem-keeper", 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.
$ npx skills add discord-php/DiscordPHP --skill voice-subsystem-keeper -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install discord-php/DiscordPHP voice-subsystem-keeper --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/discord-php/DiscordPHP.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/voice-subsystem-keeper .opencode/skills/voice-subsystem-keeper && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "voice-subsystem-keeper" agent skill from https://github.com/discord-php/DiscordPHP/tree/master/.agents/skills/voice-subsystem-keeper into .opencode/skills/voice-subsystem-keeper/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "voice-subsystem-keeper", 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
voice-subsystem-keeper- GitHub stars
- 1.1k
- Token cost
- ~1.7k tokens
- SKILL.md length
- 718 words
- Files
- 1
- Skills in repo
- 14
- Repo updated
- First seen
- Licence
- MIT
At a glance
Work with DiscordPHP's voice subsystem — voice gateway protocol opcodes, encryption (VoiceGroupCrypto), voice packets, audio streaming, and Discord.php voice integration.
- Works in 9 steps: src/Discord/Voice/VoiceGroupCrypto.php —… → src/Discord/Voice/VoiceGroupCryptoTrait.p… → src/Discord/Voice/VoiceGroupCryptoInterfa… → …
- Touching Voice/
- SKILL.md covers Architecture overview, Read in this order, Core concepts and Companion surfaces, plus 4 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Voice Subsystem Keeper is an agent skill from discord-php/DiscordPHP. Work with DiscordPHP's voice subsystem — voice gateway protocol opcodes, encryption (VoiceGroupCrypto), voice packets, audio streaming, and Discord.php voice integration. Use when touching Voice/, joinVoiceChannel, or voice encryption/packet logic.
Its SKILL.md is about 1.7k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Discord and PHP. The repository describes itself as: An API to interact with the popular messaging app Discord. The licence is MIT.
When your agent uses it
- Touching Voice/
- JoinVoiceChannel
- Voice encryption/packet logic
Example prompts
- “/voice-subsystem-keeper”
Workflow steps
9 steps, taken from the first numbered list in SKILL.md.
- src/Discord/Voice/VoiceGroupCrypto.php — encryption/decryption base class
- src/Discord/Voice/VoiceGroupCryptoTrait.php — mixin providing group-based AEAD crypto
- src/Discord/Voice/VoiceGroupCryptoInterface.php — contract
- src/Discord/Voice/VoicePacket.php — encrypted RTP packet encapsulation
- src/Discord/Voice/SessionDescription.php — session key and mode negotiation
- src/Discord/Voice/Speaking.php, src/Discord/Voice/Hello.php, src/Discord/Voice/Ready.php, src/Discord/Voice/Resumed.php — voice gateway…
- src/Discord/Voice/Platform.php, src/Discord/Voice/Region.php — enum helpers
- src/Discord/Discord.php — search for joinVoiceChannel, VOICE_STATE_UPDATE, VOICE_SERVER_UPDATE
- src/Discord/Helpers/Buffer.php — writable stream for audio buffering (extends EventEmitter)
What it can do on your machine
Read from SKILL.md and the folder at commit 580c66a. 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.
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
Voice Subsystem Keeper loads about 1.7k tokens when it runs. Until then it costs about 68 tokens; SKILL.md has 718 words of instructions outside code blocks.
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 discord-php/DiscordPHP at commit 580c66a, republished under its MIT licence (© discord-php). 718 words, ~1,704 tokens.
Download SKILL.mdSave it as
.claude/skills/voice-subsystem-keeper/SKILL.md (or your agent's skills folder).- name
- voice-subsystem-keeper
- description
- Work with DiscordPHP's voice subsystem — voice gateway protocol opcodes, encryption (VoiceGroupCrypto), voice packets, audio streaming, and Discord.php voice integration. Use when touching Voice/*, joinVoiceChannel, or voice encryption/packet logic.
Skill: voice-subsystem-keeper
Use this skill when work touches src/Discord/Voice/*, Discord::joinVoiceChannel(), voice event handlers in Discord.php, or anything involving audio encryption and packets.
Architecture overview
Voice support is split across three locations. Understand the boundary before touching any of them:
| Location | What lives here |
|---|---|
src/Discord/Voice/* | Internal protocol types: opcodes (Hello, Ready, Speaking), session description, voice packets, encryption classes and traits. These are pure data/crypto — no audio I/O. |
src/Discord/Discord.php | Runtime integration: joinVoiceChannel(), voice state update handlers, voice server update handlers. This is where the external voice client is wired to gateway events. |
discord-php-helpers/voice (external package) | Manager and VoiceClient: actual audio I/O, Opus encoding, UDP transport, stream management. DiscordPHP delegates audio work here. |
Rule: do not blur these boundaries. Protocol types belong in Voice/*, audio I/O belongs in the external package, and wiring belongs in Discord.php.
Read in this order
src/Discord/Voice/VoiceGroupCrypto.php— encryption/decryption base classsrc/Discord/Voice/VoiceGroupCryptoTrait.php— mixin providing group-based AEAD cryptosrc/Discord/Voice/VoiceGroupCryptoInterface.php— contractsrc/Discord/Voice/VoicePacket.php— encrypted RTP packet encapsulationsrc/Discord/Voice/SessionDescription.php— session key and mode negotiationsrc/Discord/Voice/Speaking.php,src/Discord/Voice/Hello.php,src/Discord/Voice/Ready.php,src/Discord/Voice/Resumed.php— voice gateway opcodessrc/Discord/Voice/Platform.php,src/Discord/Voice/Region.php— enum helperssrc/Discord/Discord.php— search forjoinVoiceChannel,VOICE_STATE_UPDATE,VOICE_SERVER_UPDATEsrc/Discord/Helpers/Buffer.php— writable stream for audio buffering (extends EventEmitter)
Core concepts
Voice gateway protocol
Discord voice uses a separate WebSocket gateway from the main gateway. The handshake sequence is:
Hello— server sends heartbeat intervalIdentify— client sends token + sessionReady— server sends UDP endpoint + SSRCSelect Protocol— client sends chosen encryption modeSession Description— server sends secret keySpeaking— sent before/after transmitting audio
The classes in src/Discord/Voice/ model these protocol steps as typed value objects.
Encryption
VoiceGroupCrypto provides AEAD encryption for RTP packets. It depends on libsodium (ext-sodium). The trait VoiceGroupCryptoTrait provides the implementation; concrete classes select the cipher mode (e.g., aead_xchacha20poly1305_ietf).
LibSodiumNotFoundExceptionis thrown at runtime if the extension is absent — do not suppress it- Cipher mode is negotiated via
SessionDescription
VoicePacket
VoicePacket encapsulates an encrypted RTP packet:
- SSRC identifies the audio source
- Sequence number and timestamp are required for RTP ordering
- The packet is encrypted before transmission using the session secret key
Audio I/O (external package)
discord-php-helpers/voice owns all audio work:
- Opus codec encoding/decoding
- UDP socket management
- OGG/Opus stream handling
- FFmpeg process integration
Do not replicate any of this in src/Discord/Voice/. If you need to add audio capability, contribute to the external package or wrap it.
Old* files
OldVoiceClient.php, OldBuffer.php, OldOggStream.php, OldOggPage.php, OldOpusHead.php, OldOpusTags.php, OldReceiveStream.php are legacy implementations. They are preserved for compatibility only.
Do not extend, copy patterns from, or add new features to any Old* class. Fix bugs in them only when the fix is isolated and does not require architectural change.
Show full SKILL.md (281 more words)Show less
Companion surfaces
When touching voice code, also inspect:
| Touching | Also inspect |
|---|---|
VoiceGroupCrypto or crypto mode | SessionDescription, VoicePacket, VoiceGroupCryptoInterface, LibSodiumNotFoundException |
Speaking or voice gateway opcode | Hello, Ready, Resumed, SessionDescription — full handshake chain |
Discord.php voice handlers | Voice gateway opcodes, Buffer, external voice package Manager |
Buffer.php | Multipart.php (similar streaming pattern), external voice package stream classes |
| Any new voice encryption mode | VoiceGroupCryptoInterface, crypto trait, SessionDescription mode list |
Playbook: adding a new voice encryption mode
- Add the mode constant to
SessionDescription. - Implement the mode in a class using
VoiceGroupCryptoTraitor extendingVoiceGroupCrypto. - Register the mode in the external voice package's cipher negotiation if needed.
- Update
VoiceGroupCryptoInterfaceif the contract changes. - Verify libsodium function availability — throw
LibSodiumNotFoundExceptionif missing. - Add tests for encrypt/decrypt round-trip.
Playbook: adding a voice gateway opcode
- Create a typed value class under
src/Discord/Voice/mirroring the Discord voice gateway docs. - Wire the opcode handler in
Discord.php(find the voice WebSocket message handler). - Document the opcode sequence in the class docblock.
- Do not put audio I/O logic in the opcode class — keep it as a typed payload.
Design tripwires
- Adding audio codec, UDP, or FFmpeg logic inside
src/Discord/Voice/— that belongs in the external voice package - Extending any
Old*class for new features - Skipping libsodium availability check before using sodium functions
- Hard-coding a cipher mode instead of reading it from
SessionDescription - Blocking I/O inside voice packet or stream handlers — everything must be async/Promise-based
- Catching
LibSodiumNotFoundExceptionsilently instead of surfacing it to the caller
Reference files
src/Discord/Voice/VoiceGroupCrypto.php— encryption basesrc/Discord/Voice/VoicePacket.php— RTP packet wrappersrc/Discord/Voice/SessionDescription.php— session key/modesrc/Discord/Voice/Speaking.php— voice speaking opcodesrc/Discord/Helpers/Buffer.php— writable stream helpersrc/Discord/Exceptions/LibSodiumNotFoundException.php— crypto dependency guardsrc/Discord/Exceptions/OpusNotFoundException.php— codec dependency guardsrc/Discord/Exceptions/FFmpegNotFoundException.php— audio tool dependency guard
© discord-php, 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/voice-subsystem-keeper of discord-php/DiscordPHP.
Open the folder on GitHubat commit 580c66a
Compare with similar skills
Voice Subsystem Keeper 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Voice Subsystem Keeper this skilldiscord-php/DiscordPHP | 1.1k | — | ~1.7k | Automated safety check: Pass | MIT | |
| Agent Browser CLIvercel-labs/agent-browser | 44k | 24 repos | ~864 | Automated safety check: Pass | Apache-2.0 | |
| Configuring Horizoncoollabsio/coolify | 63k | 4 repos | ~898 | Automated safety check: Pass | MIT | |
| Tailwindcss Developmentanonaddy/anonaddy | 4.9k | 10 repos | ~865 | Automated safety check: Pass | MIT | |
| Fortify Developmentcoollabsio/coolify | 63k | 4 repos | ~1.9k | Automated safety check: Pass | MIT | |
| MCP Developmentcoollabsio/coolify | 63k | 1 repos | ~949 | Automated safety check: Pass | MIT |
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Related
Questions about Voice Subsystem Keeper
What does Voice Subsystem Keeper do?
Work with DiscordPHP's voice subsystem — voice gateway protocol opcodes, encryption (VoiceGroupCrypto), voice packets, audio streaming, and Discord.php voice integration. Voice Subsystem Keeper is an agent skill from discord-php/DiscordPHP.php voice integration.
When should I use Voice Subsystem Keeper?
Voice Subsystem Keeper fits situations like: touching Voice/; joinVoiceChannel; voice encryption/packet logic.
How do I install Voice Subsystem Keeper in Claude Code?
Run `npx skills add discord-php/DiscordPHP --skill voice-subsystem-keeper -a claude-code`. Or copy the skill folder (.agents/skills/voice-subsystem-keeper in discord-php/DiscordPHP) into .claude/skills/voice-subsystem-keeper in your project. Claude Code loads it when a task matches its description.
How do I install Voice Subsystem Keeper in Codex?
Run `npx skills add discord-php/DiscordPHP --skill voice-subsystem-keeper -a codex`. Or copy the skill folder (.agents/skills/voice-subsystem-keeper in discord-php/DiscordPHP) into .agents/skills/voice-subsystem-keeper in your project. Codex loads it when a task matches its description.
Can I use Voice Subsystem Keeper 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 discord-php/DiscordPHP --skill voice-subsystem-keeper -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/voice-subsystem-keeper, .gemini/skills/voice-subsystem-keeper, .github/skills/voice-subsystem-keeper and .opencode/skills/voice-subsystem-keeper in your project.
What does Voice Subsystem Keeper need to run?
SKILL.md names no scripts, command-line tools or credentials: Voice Subsystem Keeper is instructions for the agent only.
Does Voice Subsystem Keeper 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 Voice Subsystem Keeper 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 Voice Subsystem Keeper use?
Voice Subsystem Keeper 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 Voice Subsystem Keeper use?
About 1.7k tokens (SKILL.md is roughly 6.8k 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 Voice Subsystem Keeper?
Skills that share tags, products or a category with Voice Subsystem Keeper: Agent Browser CLI (vercel-labs/agent-browser, 44k stars), Configuring Horizon (coollabsio/coolify, 63k stars), Tailwindcss Development (anonaddy/anonaddy, 4.9k stars) and Fortify Development (coollabsio/coolify, 63k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Voice Subsystem Keeper?
discord-php (a GitHub organization) maintains it in discord-php/DiscordPHP, which has 1,080 GitHub stars. The repository holds 14 skills in this directory. The repository was last updated on October 6, 2026.
Source: discord-php/DiscordPHP on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.