Agent skill

App State

NullPlayer session-state restoration, AppStateManager, AppPersistence edition scoping, and reset paths.

Custom licenceAuto-check passedAgent Workflows

Install App State

skills CLI

$ npx skills add ad-repo/nullplayer --skill app-state -a claude-code

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

GitHub CLI

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

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 app-state -a codex

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

GitHub CLI

$ gh skill install ad-repo/nullplayer app-state --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/app-state .agents/skills/app-state && 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 "app-state" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/app-state into .agents/skills/app-state/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "app-state", 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 app-state -a cursor

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

GitHub CLI

$ gh skill install ad-repo/nullplayer app-state --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/app-state .cursor/skills/app-state && 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 "app-state" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/app-state into .cursor/skills/app-state/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "app-state", 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/app-state

--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 app-state -a gemini-cli

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

GitHub CLI

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

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 app-state -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/app-state .github/skills/app-state && 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 "app-state" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/app-state into .github/skills/app-state/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "app-state", 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 app-state -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 app-state --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/app-state .opencode/skills/app-state && 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 "app-state" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/app-state into .opencode/skills/app-state/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "app-state", 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: app-state
GitHub stars: 158
Token cost: ~1.3k tokens
SKILL.md length: 745 words
Files: 1
Skills in repo: 40
Repo updated: Oct 10, 2026
First seen: Oct 7, 2026
Licence: Custom licence

At a glance

NullPlayer session-state restoration, AppStateManager, AppPersistence edition scoping, and reset paths.

Adding a persisted preference
SKILL.md covers Remember State On Quit and A restored main-window size…
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Changing launch restoration

What it does

App State is an agent skill from ad-repo/nullplayer. NullPlayer session-state restoration, AppStateManager, AppPersistence edition scoping, and reset paths. Use when adding a persisted preference, changing launch restoration, or working on custom editions.

Its SKILL.md is about 1.3k 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 Agent Workflows, covering Session handoff. The repository describes itself as: nullPlayer is a free open source macOS media player with some unique features.

When your agent uses it

Adding a persisted preference
Changing launch restoration
Working on custom editions

Example prompts

“/app-state”

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

App State loads about 1.3k tokens when it runs. Until then it costs about 53 tokens; SKILL.md has 745 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: ~1.3k

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 745 words (~1,299 tokens).

“AppStateManager saves and restores session state (v2) for window visibility and layout, audio and EQ state, and playlist contents. It intentionally does not save or restore the selected or current track, seek position, or playing state, so launch starts paused…”

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

name: app-state

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/app-state of ad-repo/nullplayer.

Open the folder on GitHubat commit 3d87ce1

Compare with similar skills

App State 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.

App State compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
App State this skillad-repo/nullplayer	158	—	~1.3k	Automated safety check: Pass	Custom licence	today
Orca CLIstablyai/orca	89k	2 repos	~593	Automated safety check: Pass	MIT	today
Beads Task Memorygastownhall/beads	28k	—	~1.2k	Automated safety check: Pass	MIT	today
Session History Searchslopus/happy	24k	—	~3.1k	Automated safety check: Pass	MIT	today
Paseo Agent Handoffgetpaseo/paseo	20k	1 repos	~606	Automated safety check: Pass	Custom licence	yesterday
Memori Long-Term MemoryMemoriLabs/Memori	17k	—	~2k	Automated safety check: Notes	Custom licence	7 days ago

Similar skills

Orca CLI
stablyai/orca
Operate Orca-managed worktrees, folder contexts, terminals, repos, automations, artifacts, skill sharing, worktree comments, and Orca's embedded browser…
89k GitHub starsUsed in 2 repos~593 tokens
Agent WorkflowsAuto-check passed
Beads Task Memory
gastownhall/beads
Tracks multi-session work with dependencies in the bd issue tracker so the agent can find ready tasks and recover its context after conversation compaction.
28k GitHub stars~1.2k tokensUpdated today
Agent WorkflowsAuto-check passed
Session History Search
slopus/happy
Searches past Claude Code, Codex and Cursor sessions and summarizes what was worked on, tried or decided, using extraction scripts instead of reading raw logs.
24k GitHub stars~3.1k tokensUpdated today
Agent WorkflowsAuto-check passed
Paseo Agent Handoff
getpaseo/paseo
Hands off the current task, including context, decisions and failed attempts, to a fresh agent through Paseo by writing a self-contained briefing prompt and launching that agent.
20k GitHub starsUsed in 1 repo~606 tokens
Agent WorkflowsAuto-check passed
Memori Long-Term Memory
MemoriLabs/Memori
Connects Claude Code to Memori Cloud for long-term memory, recalling stored context before substantive replies and saving new context afterward.
17k GitHub stars~2k tokensUpdated 7 days ago
Agent WorkflowsAuto-check: notes
Beads
liwp/again
A skill your agent uses when working in a repository that uses bd or Beads for durable project task tracking, issue dependencies, blocker management, multi-session handoff, or shared work memory.
118 GitHub starsUsed in 6 repos~537 tokens
Agent WorkflowsAuto-check passed

Questions about App State

What does App State do?

NullPlayer session-state restoration, AppStateManager, AppPersistence edition scoping, and reset paths. App State is an agent skill from ad-repo/nullplayer. NullPlayer session-state restoration, AppStateManager, AppPersistence edition scoping, and reset paths.

When should I use App State?

App State fits situations like: adding a persisted preference; changing launch restoration; working on custom editions.

How do I install App State in Claude Code?

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

How do I install App State in Codex?

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

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

What does App State need to run?

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

Does App State 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 App State 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 App State use?

App State 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 App State use?

About 1.3k tokens (SKILL.md is roughly 5.2k 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 App State?

Skills that share tags, products or a category with App State: Orca CLI (stablyai/orca, 89k stars), Beads Task Memory (gastownhall/beads, 28k stars), Session History Search (slopus/happy, 24k stars) and Paseo Agent Handoff (getpaseo/paseo, 20k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains App State?

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.

App State

Install App State

Facts

At a glance

What it does

When your agent uses it

Example prompts

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

Orca CLI

Beads Task Memory

Session History Search

Paseo Agent Handoff

Memori Long-Term Memory

Beads

More from ad-repo/nullplayer

Skin Screenshots

Vis Classic Guide

App Control

Chromecast Casting

Emby Integration

Live UI Testing

Questions about App State

Install App State

Facts

At a glance

What it does

When your agent uses it

Example prompts

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

More from ad-repo/nullplayer

Related

Questions about App State