Agent skill

Sonos Casting

Sonos UPnP discovery, multi-room casting, coordinator transfer, dockable room mixer, individual room volume, custom checkbox UI, and protocol quirks.

Custom licenceAuto-check passed

Install Sonos Casting

skills CLI

$ npx skills add ad-repo/nullplayer --skill sonos-casting -a claude-code

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

GitHub CLI

$ gh skill install ad-repo/nullplayer sonos-casting --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/ad-repo/nullplayer.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sonos-casting .claude/skills/sonos-casting && 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 "sonos-casting" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/sonos-casting into .claude/skills/sonos-casting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sonos-casting", 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/ad-repo/nullplayer/tree/main/skills/sonos-casting

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 ad-repo/nullplayer --skill sonos-casting -a codex

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

GitHub CLI

$ gh skill install ad-repo/nullplayer sonos-casting --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/sonos-casting .agents/skills/sonos-casting && 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 "sonos-casting" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/sonos-casting into .agents/skills/sonos-casting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sonos-casting", 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 ad-repo/nullplayer --skill sonos-casting -a cursor

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

GitHub CLI

$ gh skill install ad-repo/nullplayer sonos-casting --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/sonos-casting .cursor/skills/sonos-casting && 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 "sonos-casting" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/sonos-casting into .cursor/skills/sonos-casting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sonos-casting", 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/ad-repo/nullplayer.git --path skills/sonos-casting

--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 ad-repo/nullplayer --skill sonos-casting -a gemini-cli

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

GitHub CLI

$ gh skill install ad-repo/nullplayer sonos-casting --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/ad-repo/nullplayer.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/sonos-casting .gemini/skills/sonos-casting && 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 "sonos-casting" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/sonos-casting into .gemini/skills/sonos-casting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sonos-casting", 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 ad-repo/nullplayer sonos-casting

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 ad-repo/nullplayer --skill sonos-casting -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/sonos-casting .github/skills/sonos-casting && 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 "sonos-casting" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/sonos-casting into .github/skills/sonos-casting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sonos-casting", 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 ad-repo/nullplayer --skill sonos-casting -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 ad-repo/nullplayer sonos-casting --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/sonos-casting .opencode/skills/sonos-casting && 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 "sonos-casting" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/sonos-casting into .opencode/skills/sonos-casting/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sonos-casting", 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: sonos-casting
GitHub stars: 158
Token cost: ~9.8k tokens
SKILL.md length: 4,865 words
Files: 2
Skills in repo: 39
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: Custom licence

At a glance

Sonos UPnP discovery, multi-room casting, coordinator transfer, dockable room mixer, individual room volume, custom checkbox UI, and protocol quirks.

Works in 2 steps: SSDP (Simple Service Discovery Protocol) → mDNS/Bonjour (Fallback)
Working on Sonos casting
SKILL.md covers Quick Start, Discovery Methods, Requirements and Architecture, plus 4 more sections
Calls curl

What it does

Sonos Casting is an agent skill from ad-repo/nullplayer. Sonos UPnP discovery, multi-room casting, coordinator transfer, dockable room mixer, individual room volume, custom checkbox UI, and protocol quirks. Use when working on Sonos casting, room controls, UPnP control, multi-room audio, or group management.

Its SKILL.md is about 9.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `artwork-debugging-history.md`).

The repository describes itself as: nullPlayer is a free open source macOS media player with some unique features.

When your agent uses it

Working on Sonos casting
Multi-room audio
Group management

Example prompts

“Use the sonos-casting skill to sono UPnP discovery, multi-room casting, coordinator transfer, dockable room mixer, individual room volume, custom…”
“/sonos-casting”

Workflow steps

2 steps, taken from the step headings in SKILL.md.

SSDP (Simple Service Discovery Protocol)
mDNS/Bonjour (Fallback)

What it can do on your machine

Read from SKILL.md and the folder at commit 04582d1. 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
Shell commands in SKILL.md call:
- curl
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
- github.com
- docs.sonos.com
- support.sonos.com
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

Sonos Casting loads about 9.8k tokens when it runs. Until then it costs about 67 tokens; SKILL.md has 4,865 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~67
When it runs · the whole SKILL.md, loaded when a task matches: ~9.8k

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 4,865 words (~9,800 tokens).

“This guide covers Sonos speaker discovery, casting, and multi-room grouping in NullPlayer.”

— opening of SKILL.md by ad-repo, Custom licence

name: sonos-casting

Outline of SKILL.md

Sonos Integration
Quick Start
Discovery Methods
1. SSDP (Simple Service Discovery Protocol)
2. mDNS/Bonjour (Fallback)
Requirements
UPnP Must Be Enabled
Connection Security (Firmware 85.0+, July 2025)
Architecture
Zone vs Group vs Room
Discovery Flow
Group Topology
User Interface
Sonos Rooms window
Menu Structure
Checkbox Behavior
Multi-Select Feature
Casting Workflow
Starting a Cast
Managing Rooms While Casting
Stopping a Cast
Casting Protocol
AVTransport Control
Fire-and-Forget Commands
Volume Control
Playback State Monitoring
Resilience and Recovery
Group Management
Implementation Details
State Management

Read the full SKILL.md on GitHub

Files

SKILL.md and 1 other file in skills/sonos-casting of ad-repo/nullplayer.

SKILL.md
artwork-debugging-history.md

Open the folder on GitHubat commit 04582d1

Compare with similar skills

Sonos Casting 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.

Sonos Casting compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Sonos Casting this skillad-repo/nullplayer	158	—	~9.8k	Automated safety check: Pass	Custom licence	today
Sonossteipete/agent-scripts	7.3k	—	~440	Automated safety check: Pass	MIT	5 days ago
No Bare Castsprisma/orm	48k	—	~705	Automated safety check: Pass	Apache-2.0	today
Agent Adaptive Coordinatorruvnet/ruflo	74k	2 repos	~4k	Automated safety check: Pass	MIT	today
Agent Consensus Coordinatorruvnet/ruflo	74k	2 repos	~3.2k	Automated safety check: Pass	MIT	today
Agent Hierarchical Coordinatorruvnet/ruflo	74k	2 repos	~2.8k	Automated safety check: Pass	MIT	today

Similar skills

Sonos
steipete/agent-scripts
Sonos control: search, queue, playlists, rooms/groups, volume, YouTube.
7.3k GitHub stars~440 tokensUpdated 5 days ago
Auto-check passed
No Bare Casts
prisma/orm
Official
Replaces bare `as` casts in production TypeScript with a decision tree of tighter types, type predicates, satisfies and audited cast helpers.
48k GitHub stars~705 tokensUpdated today
DevelopmentAuto-check passed
Agent Adaptive Coordinator
ruvnet/ruflo
Agent skill for adaptive-coordinator - invoke with $agent-adaptive-coordinator
74k GitHub starsUsed in 2 repos~4k tokens
Auto-check passed
Agent Consensus Coordinator
ruvnet/ruflo
Agent skill for consensus-coordinator - invoke with $agent-consensus-coordinator
74k GitHub starsUsed in 2 repos~3.2k tokens
Agent WorkflowsAuto-check passed
Agent Hierarchical Coordinator
ruvnet/ruflo
Agent skill for hierarchical-coordinator - invoke with $agent-hierarchical-coordinator
74k GitHub starsUsed in 2 repos~2.8k tokens
Agent WorkflowsAuto-check passed
Agent Memory Coordinator
ruvnet/ruflo
Agent skill for memory-coordinator - invoke with $agent-memory-coordinator
74k GitHub starsUsed in 2 repos~1.2k tokens
Agent WorkflowsAuto-check passed

Questions about Sonos Casting

What does Sonos Casting do?

Sonos UPnP discovery, multi-room casting, coordinator transfer, dockable room mixer, individual room volume, custom checkbox UI, and protocol quirks. Sonos Casting is an agent skill from ad-repo/nullplayer. Sonos UPnP discovery, multi-room casting, coordinator transfer, dockable room mixer, individual room volume, custom checkbox UI, and protocol quirks.

When should I use Sonos Casting?

Sonos Casting fits situations like: working on Sonos casting; multi-room audio; group management.

How do I install Sonos Casting in Claude Code?

Run `npx skills add ad-repo/nullplayer --skill sonos-casting -a claude-code`. Or copy the skill folder (skills/sonos-casting in ad-repo/nullplayer) into .claude/skills/sonos-casting in your project. Claude Code loads it when a task matches its description.

How do I install Sonos Casting in Codex?

Run `npx skills add ad-repo/nullplayer --skill sonos-casting -a codex`. Or copy the skill folder (skills/sonos-casting in ad-repo/nullplayer) into .agents/skills/sonos-casting in your project. Codex loads it when a task matches its description.

Can I use Sonos Casting 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 ad-repo/nullplayer --skill sonos-casting -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sonos-casting, .gemini/skills/sonos-casting, .github/skills/sonos-casting and .opencode/skills/sonos-casting in your project.

What does Sonos Casting need to run?

Going by SKILL.md and its folder, Sonos Casting needs the command-line tools its instructions call (curl).

Does Sonos Casting access the network?

SKILL.md names 3 domains. As links in the text: github.com, docs.sonos.com and support.sonos.com. This is read from the text; nothing was executed.

Is Sonos Casting 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 Sonos Casting use?

Sonos Casting has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Sonos Casting use?

About 9.8k tokens (SKILL.md is roughly 39k 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 Sonos Casting?

Skills that share tags, products or a category with Sonos Casting: Sonos (steipete/agent-scripts, 7.3k stars), No Bare Casts (prisma/orm, 48k stars), Agent Adaptive Coordinator (ruvnet/ruflo, 74k stars) and Agent Consensus Coordinator (ruvnet/ruflo, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Sonos Casting?

ad-repo (a GitHub user) maintains it in ad-repo/nullplayer, which has 158 GitHub stars. The repository holds 39 skills in this directory. The repository was last updated on October 9, 2026.

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

Sonos Casting

Install Sonos Casting

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

Files

Compare with similar skills

Similar skills

Sonos

No Bare Casts

Agent Adaptive Coordinator

Agent Consensus Coordinator

Agent Hierarchical Coordinator

Agent Memory Coordinator

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Questions about Sonos Casting