Windows Desktop E2E
affaan-m/ECC
E2E testing for Windows native desktop apps (WPF, WinForms, Win32/MFC, Qt) using pywinauto and Windows UI Automation.
Flow network throughput window — live download/upload meter, interface selection, single-height center-stack docking, classic/modern window controllers, and rendering behavior.
Custom licenceAuto-check passed
Install Flow
$ npx skills add ad-repo/nullplayer --skill flow -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ad-repo/nullplayer flow --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/ad-repo/nullplayer.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/flow .claude/skills/flow && 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 "flow" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/flow into .claude/skills/flow/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flow", 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/ad-repo/nullplayer/tree/main/skills/flowType 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 ad-repo/nullplayer --skill flow -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ad-repo/nullplayer flow --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/flow .agents/skills/flow && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "flow" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/flow into .agents/skills/flow/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flow", 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 ad-repo/nullplayer --skill flow -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ad-repo/nullplayer flow --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/flow .cursor/skills/flow && 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 "flow" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/flow into .cursor/skills/flow/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flow", 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/ad-repo/nullplayer.git --path skills/flow--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 ad-repo/nullplayer --skill flow -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ad-repo/nullplayer flow --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/flow .gemini/skills/flow && 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 "flow" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/flow into .gemini/skills/flow/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flow", 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 ad-repo/nullplayer flowInstalls 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 ad-repo/nullplayer --skill flow -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/flow .github/skills/flow && 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 "flow" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/flow into .github/skills/flow/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flow", 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 ad-repo/nullplayer --skill flow -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ad-repo/nullplayer flow --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ad-repo/nullplayer.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/flow .opencode/skills/flow && 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 "flow" agent skill from https://github.com/ad-repo/nullplayer/tree/main/skills/flow into .opencode/skills/flow/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flow", 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
flow- GitHub stars
- 158
- Token cost
- ~1.5k tokens
- SKILL.md length
- 670 words
- Files
- 1
- Skills in repo
- 39
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Flow network throughput window — live download/upload meter, interface selection, single-height center-stack docking, classic/modern window controllers, and rendering behavior.
- SKILL.md covers Source Project, User Behavior, Window Layout and Key Source Files, plus 3 more sections
- Calls swift; reaches github.com
What it does
Flow is an agent skill from ad-repo/nullplayer. Flow network throughput window — live download/upload meter, interface selection, single-height center-stack docking, classic/modern window controllers, and rendering behavior.
Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: nullPlayer is a free open source macOS media player with some unique features.
Example prompts
- “/flow”
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:
swift
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
github.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
Flow loads about 1.5k tokens when it runs. Until then it costs about 45 tokens; SKILL.md has 670 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 670 words (~1,530 tokens).
“Flow is a dockable network throughput meter available in classic and modern UI.”
- name
- flow
Files
Just SKILL.md in skills/flow of ad-repo/nullplayer.
Open the folder on GitHubat commit 04582d1
Compare with similar skills
Flow 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 |
|---|---|---|---|---|---|---|
| Flow this skillad-repo/nullplayer | 158 | — | ~1.5k | Automated safety check: Pass | Custom licence | |
| Windows Desktop E2Eaffaan-m/ECC | 276k | 1 repos | ~7.6k | Automated safety check: Pass | MIT | |
| Windows Desktop E2Eaffaan-m/ECC | 276k | — | ~5.5k | Automated safety check: Pass | MIT | |
| File Uploadsdavila7/claude-code-templates | 32k | 4 repos | ~238 | Automated safety check: Pass | MIT | |
| File Upload Accessibilitythedaviddias/Front-End-Checklist | 74k | — | ~418 | Automated safety check: Pass | MIT | |
| Video Downloadernexu-io/open-design | 100k | — | ~339 | Automated safety check: Pass | Apache-2.0 |
Similar skills
Windows Desktop E2E
affaan-m/ECC
E2E testing for Windows native desktop apps (WPF, WinForms, Win32/MFC, Qt) using pywinauto and Windows UI Automation.
File Uploads
davila7/claude-code-templates
Expert at handling file uploads and cloud storage. An agent skill from davila7/claude-code-templates.
File Upload Accessibility
thedaviddias/Front-End-Checklist
A skill your agent uses when reviewing templates, rendered HTML, or shared components related to Make file uploads accessible.
Video Downloader
nexu-io/open-design
Download videos from YouTube and other platforms for offline viewing, editing, or archival with support for various formats and quality options.
Video Download
calesthio/OpenMontage
Download video and audio from YouTube and 1000+ sites using yt-dlp.
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Capture one centred main-window screenshot per skin across every skin system (Classic, Original, Original-Metal, Modern/.wal, Media Player/.wmz) and assemble them into a fixed-duration slideshow GIF.
Vis Classic Guide
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Comprehensive implementation and profile reference for NullPlayer's visclassic mode (CVisClassicCore, VisClassicBridge, SpectrumAnalyzerView integration, menu/keyboard controls…
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Launch, configure, drive, screenshot and measure the running NullPlayer app.
Chromecast Casting
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Google Cast Protocol v2, message framing, debugging, and test scripts.
Emby Integration
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Emby API, authentication flow, rating scale, streaming, scrobbling, and video playback.
Live UI Testing
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Questions about Flow
What does Flow do?
Flow network throughput window — live download/upload meter, interface selection, single-height center-stack docking, classic/modern window controllers, and rendering behavior. Flow is an agent skill from ad-repo/nullplayer. Flow network throughput window — live download/upload meter, interface selection, single-height center-stack docking, classic/modern window controllers, and rendering behavior.
How do I install Flow in Claude Code?
Run `npx skills add ad-repo/nullplayer --skill flow -a claude-code`. Or copy the skill folder (skills/flow in ad-repo/nullplayer) into .claude/skills/flow in your project. Claude Code loads it when a task matches its description.
How do I install Flow in Codex?
Run `npx skills add ad-repo/nullplayer --skill flow -a codex`. Or copy the skill folder (skills/flow in ad-repo/nullplayer) into .agents/skills/flow in your project. Codex loads it when a task matches its description.
Can I use Flow 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 flow -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/flow, .gemini/skills/flow, .github/skills/flow and .opencode/skills/flow in your project.
What does Flow need to run?
Going by SKILL.md and its folder, Flow needs the command-line tools its instructions call (swift).
Does Flow access the network?
SKILL.md names 1 domain. In commands or code: github.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.
Is Flow 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 Flow use?
Flow 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 Flow use?
About 1.5k tokens (SKILL.md is roughly 6.1k 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 Flow?
Skills that share tags, products or a category with Flow: Windows Desktop E2E (affaan-m/ECC, 276k stars), Windows Desktop E2E (affaan-m/ECC, 276k stars), File Uploads (davila7/claude-code-templates, 32k stars) and File Upload Accessibility (thedaviddias/Front-End-Checklist, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Flow?
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.