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Agent skill

Chromecast Casting

by ad-repo in ad-repo/nullplayer

Google Cast Protocol v2, message framing, debugging, and test scripts.

Custom licenceAuto-check passedDevelopment

Install Chromecast Casting

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

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

GitHub CLI
$ gh skill install ad-repo/nullplayer chromecast-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/chromecast-casting .claude/skills/chromecast-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/

Facts

Skill name
chromecast-casting
GitHub stars
158
Token cost
~4.6k tokens
SKILL.md length
1,815 words
Files
1
Skills in repo
40
Repo updated
First seen
Licence
Custom licence

At a glance

Google Cast Protocol v2, message framing, debugging, and test scripts.

  • Works in 4 steps: TLS Connection — Port 8009, self-signed… → Protobuf Framing — 4-byte big-endian… → Namespaces — Different message types use… → …
  • Working on Chromecast casting
  • SKILL.md covers Key Files, Discovery, Protocol Overview and Message Namespaces, plus 13 more sections
  • Calls swift

What it does

Chromecast Casting is an agent skill from ad-repo/nullplayer. Google Cast Protocol v2, message framing, debugging, and test scripts. Use when working on Chromecast casting, debugging Cast protocol issues, or implementing Cast commands.

Its SKILL.md is about 4.6k 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 Development, covering Debugging. 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 Chromecast casting
  • Debugging Cast protocol issues
  • Implementing Cast commands

Example prompts

  • “/chromecast-casting”

Workflow steps

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

  1. TLS Connection — Port 8009, self-signed certificate (must accept)
  2. Protobuf Framing — 4-byte big-endian length prefix + protobuf message
  3. Namespaces — Different message types use different namespace URNs
  4. Session Flow

What it can do on your machine

Read from SKILL.md and the folder at commit 3d87ce1. 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:

    • swift

    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
    • developers.google.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

Chromecast Casting loads about 4.6k tokens when it runs. Until then it costs about 48 tokens; SKILL.md has 1,815 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~48
When it runs · the whole SKILL.md, loaded when a task matches
~4.6k

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 1,815 words (~4,589 tokens).

“NullPlayer implements Google Cast Protocol v2 for casting audio and video to Chromecast devices.”

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

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/chromecast-casting of ad-repo/nullplayer.

Open the folder on GitHubat commit 3d87ce1

Compare with similar skills

Chromecast 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.

Chromecast Casting compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Chromecast Casting this skillad-repo/nullplayer158—~4.6kAutomated safety check: PassCustom licence
Trellis Session Insightmindfold-ai/Trellis15k4 repos~1.7kAutomated safety check: PassAGPL-3.0
Native Data FetchingCherryHQ/cherry-studio-app4k6 repos~2.9kAutomated safety check: NotesMIT
Debugging Executionsn8n-io/n8n207k—~2.6kAutomated safety check: PassCustom licence
Aoti Debugpytorch/pytorch104k1 repos~1.7kAutomated safety check: PassCustom licence
Herdr Throwaway Reproductionherdrdev/herdr43k—~2.4kAutomated safety check: PassApache-2.0

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Categories

Questions about Chromecast Casting

What does Chromecast Casting do?

Google Cast Protocol v2, message framing, debugging, and test scripts. Chromecast Casting is an agent skill from ad-repo/nullplayer. Google Cast Protocol v2, message framing, debugging, and test scripts.

When should I use Chromecast Casting?

Chromecast Casting fits situations like: working on Chromecast casting; debugging Cast protocol issues; implementing Cast commands.

How do I install Chromecast Casting in Claude Code?

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

How do I install Chromecast Casting in Codex?

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

Can I use Chromecast 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 chromecast-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/chromecast-casting, .gemini/skills/chromecast-casting, .github/skills/chromecast-casting and .opencode/skills/chromecast-casting in your project.

What does Chromecast Casting need to run?

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

Does Chromecast Casting access the network?

SKILL.md names 2 domains. As links in the text: github.com and developers.google.com. This is read from the text; nothing was executed.

Is Chromecast 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 Chromecast Casting use?

Chromecast 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 Chromecast Casting use?

About 4.6k tokens (SKILL.md is roughly 18k 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 Chromecast Casting?

Skills that share tags, products or a category with Chromecast Casting: Trellis Session Insight (mindfold-ai/Trellis, 15k stars), Native Data Fetching (CherryHQ/cherry-studio-app, 4k stars), Debugging Executions (n8n-io/n8n, 207k stars) and Aoti Debug (pytorch/pytorch, 104k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Chromecast Casting?

ad-repo (a GitHub user) maintains it in ad-repo/nullplayer, which has 158 GitHub stars. The repository holds 40 skills in this directory. The repository was last updated on October 10, 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.