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Agent skill

Jellyfin Integration

by ad-repo in ad-repo/nullplayer

Jellyfin API, authentication flow, rating scale, streaming, scrobbling, and video playback.

Custom licenceAuto-check passedBackend & APIs

Install Jellyfin Integration

skills CLI
$ npx skills add ad-repo/nullplayer --skill jellyfin-integration -a claude-code

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

GitHub CLI
$ gh skill install ad-repo/nullplayer jellyfin-integration --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/jellyfin-integration .claude/skills/jellyfin-integration && 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
jellyfin-integration
GitHub stars
158
Token cost
~4k tokens
SKILL.md length
1,675 words
Files
1
Skills in repo
40
Repo updated
First seen
Licence
Custom licence

At a glance

Jellyfin API, authentication flow, rating scale, streaming, scrobbling, and video playback.

  • Works in 4 steps: Use track.contentType if available (set… → If nil, send a HEAD request to the… → Pass the detected content type to both… → …
  • Working on Jellyfin integration
  • SKILL.md covers Architecture, Authentication, Library Browsing and Video Browsing, plus 17 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Jellyfin Integration is an agent skill from ad-repo/nullplayer. Jellyfin API, authentication flow, rating scale, streaming, scrobbling, and video playback. Use when working on Jellyfin integration, library browsing, playback reporting, or video casting.

Its SKILL.md is about 4k 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 Backend & APIs, covering Authentication. 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 Jellyfin integration
  • Library browsing
  • Playback reporting

Example prompts

  • “/jellyfin-integration”

Workflow steps

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

  1. Use track.contentType if available (set by JellyfinManager.convertToTrack() from the Container field)
  2. If nil, send a HEAD request to the upstream URL and read the Content-Type response header
  3. Pass the detected content type to both the proxy registration and the DIDL-Lite metadata
  4. Fall back to detectAudioContentType(for:) only as a last resort

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

    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

Jellyfin Integration loads about 4k tokens when it runs. Until then it costs about 53 tokens; SKILL.md has 1,675 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~53
When it runs · the whole SKILL.md, loaded when a task matches
~4k

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 1,675 words (~4,049 tokens).

“NullPlayer supports Jellyfin media servers for music streaming, video playback (movies and TV shows), browsing, and scrobbling.”

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

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/jellyfin-integration of ad-repo/nullplayer.

Open the folder on GitHubat commit 3d87ce1

Compare with similar skills

Jellyfin Integration 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.

Jellyfin Integration compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Jellyfin Integration this skillad-repo/nullplayer158—~4kAutomated safety check: PassCustom licence
Fortify Developmentcoollabsio/coolify63k4 repos~1.9kAutomated safety check: PassMIT
Supabase Development and Debuggingsupabase/agent-skills2.7k3 repos~3.6kAutomated safety check: PassMIT
Better Auth Best Practiceslatitude-dev/latitude-llm4.7k7 repos~1.6kAutomated safety check: PassMIT
Gitnexus Exploringaws-samples/sample-kolya-br-proxy10612 repos~749Automated safety check: PassMIT-0
Supabasecurvenote/curvenote1705 repos~2.2kAutomated safety check: PassCustom licence

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Categories

Questions about Jellyfin Integration

What does Jellyfin Integration do?

Jellyfin API, authentication flow, rating scale, streaming, scrobbling, and video playback. Jellyfin Integration is an agent skill from ad-repo/nullplayer. Jellyfin API, authentication flow, rating scale, streaming, scrobbling, and video playback.

When should I use Jellyfin Integration?

Jellyfin Integration fits situations like: working on Jellyfin integration; library browsing; playback reporting.

How do I install Jellyfin Integration in Claude Code?

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

How do I install Jellyfin Integration in Codex?

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

Can I use Jellyfin Integration 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 jellyfin-integration -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/jellyfin-integration, .gemini/skills/jellyfin-integration, .github/skills/jellyfin-integration and .opencode/skills/jellyfin-integration in your project.

What does Jellyfin Integration need to run?

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

Does Jellyfin Integration 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 Jellyfin Integration 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 Jellyfin Integration use?

Jellyfin Integration 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 Jellyfin Integration use?

About 4k tokens (SKILL.md is roughly 16k 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 Jellyfin Integration?

Skills that share tags, products or a category with Jellyfin Integration: Fortify Development (coollabsio/coolify, 63k stars), Supabase Development and Debugging (supabase/agent-skills, 2.7k stars), Better Auth Best Practices (latitude-dev/latitude-llm, 4.7k stars) and Gitnexus Exploring (aws-samples/sample-kolya-br-proxy, 106 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Jellyfin Integration?

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.