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Agent skill

Test Desktop App

by bholmesdev in bholmesdev/hubble.md

A skill your agent uses when testing the Hubble Electron desktop app, especially when inspecting, clicking, screenshotting, or verifying a real note edit in the running app.

MITAuto-check passedDevelopment

Install Test Desktop App

skills CLI
$ npx skills add bholmesdev/hubble.md --skill test-desktop-app -a claude-code

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

GitHub CLI
$ gh skill install bholmesdev/hubble.md test-desktop-app --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/bholmesdev/hubble.md.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/test-desktop-app .claude/skills/test-desktop-app && 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
test-desktop-app
GitHub stars
1.5k
Token cost
~397 tokens
SKILL.md length
183 words
Files
1
Skills in repo
13
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when testing the Hubble Electron desktop app, especially when inspecting, clicking, screenshotting, or verifying a real note edit in the running app.

  • Works in 6 steps: Run HUBBLE_DESKTOP_ENABLE_CDP=1 pnpm… → Read the terminal output for → Use the auto-opened editable playground… → …
  • Testing the Hubble Electron desktop app
  • Calls pnpm
  • Especially when inspecting

What it does

Test Desktop App is an agent skill from bholmesdev/hubble.md. Use when testing the Hubble Electron desktop app, especially when inspecting, clicking, screenshotting, or verifying a real note edit in the running app.

Its SKILL.md is about 400 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. The repository describes itself as: The best notepad for you and your agents. The licence is MIT.

When your agent uses it

  • Testing the Hubble Electron desktop app
  • Especially when inspecting
  • Verifying a real note edit in the running app

Example prompts

  • “/test-desktop-app”

Workflow steps

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

  1. Run HUBBLE_DESKTOP_ENABLE_CDP=1 pnpm dev:desktop.
  2. Read the terminal output for
  3. Use the auto-opened editable playground at apps/desktop/.dev-electron/playground instead of file pickers or checked-in fixtures.
  4. Prefer the Chrome DevTools Protocol endpoint for interaction-heavy verification. It can inspect DOM state, evaluate JavaScript, click…
  5. For CDP setup, fetch http://127.0.0.1:9222/json/list, connect to the page webSocketDebuggerUrl, and drive the renderer with DevTools…
  6. When you're done, stop the dev server and confirm no Hubble Dev process remains.

What it can do on your machine

Read from SKILL.md and the folder at commit 571a523. 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:

    • pnpm

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use pnpm, which can reach the network depending on how they are called.

    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

Test Desktop App loads about 397 tokens when it runs. Until then it costs about 43 tokens; SKILL.md has 183 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~43
When it runs · the whole SKILL.md, loaded when a task matches
~397

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

The full file from bholmesdev/hubble.md at commit 571a523, republished under its MIT licence (© bholmesdev). 183 words, ~397 tokens.

Download SKILL.mdSave it as .claude/skills/test-desktop-app/SKILL.md (or your agent's skills folder).
name
test-desktop-app
description
Use when testing the Hubble Electron desktop app, especially when inspecting, clicking, screenshotting, or verifying a real note edit in the running app.

Test Desktop App

  1. Run HUBBLE_DESKTOP_ENABLE_CDP=1 pnpm dev:desktop.
  2. Read the terminal output for:
    • Playground: <path>
    • DevTools listening on ws://127.0.0.1:9222/...
  3. Use the auto-opened editable playground at apps/desktop/.dev-electron/playground instead of file pickers or checked-in fixtures.
  4. Prefer the Chrome DevTools Protocol endpoint for interaction-heavy verification. It can inspect DOM state, evaluate JavaScript, click controls, inspect iframe contents, and capture screenshots from the real Electron renderer. This is useful when Computer Use has limitations interacting with the dev app window.
  5. For CDP setup, fetch http://127.0.0.1:9222/json/list, connect to the page webSocketDebuggerUrl, and drive the renderer with DevTools Protocol commands.
  6. When you're done, stop the dev server and confirm no Hubble Dev process remains.

Gotchas:

  • Build packages/ui and packages/editor first; the desktop app imports their dist output.
  • Screenshots are DPR 2: CSS px times 2.
  • Right clicks need real Input.dispatchMouseEvent events; synthetic contextmenu events don't open base-ui context menus.
  • Popup open in the DOM but missing from a screenshot? Check stacking with document.elementFromPoint.
  • xterm refits through a debounced ResizeObserver and can lag layout changes by a few seconds; re-measure before calling it a bug.

© bholmesdev, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/test-desktop-app of bholmesdev/hubble.md.

Open the folder on GitHubat commit 571a523

Compare with similar skills

Test Desktop App 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.

Test Desktop App compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Test Desktop App this skillbholmesdev/hubble.md1.5k—~397Automated safety check: PassMIT
Vercel Composition Patternssupabase/supabase111k59 repos~726Automated safety check: PassMIT
Finishing a Development Branchobra/superpowers296k5 repos~1.9kAutomated safety check: PassMIT
Typescript Advanced Typesrolling-scopes/rsschool-app10k25 repos~4.2kAutomated safety check: PassMPL-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Test Desktop App

What does Test Desktop App do?

A skill your agent uses when testing the Hubble Electron desktop app, especially when inspecting, clicking, screenshotting, or verifying a real note edit in the running app. md. Use when testing the Hubble Electron desktop app, especially when inspecting, clicking, screenshotting, or verifying a real note edit in the running app.

When should I use Test Desktop App?

Test Desktop App fits situations like: testing the Hubble Electron desktop app; especially when inspecting; verifying a real note edit in the running app.

How do I install Test Desktop App in Claude Code?

Run `npx skills add bholmesdev/hubble.md --skill test-desktop-app -a claude-code`. Or copy the skill folder (.agents/skills/test-desktop-app in bholmesdev/hubble.md) into .claude/skills/test-desktop-app in your project. Claude Code loads it when a task matches its description.

How do I install Test Desktop App in Codex?

Run `npx skills add bholmesdev/hubble.md --skill test-desktop-app -a codex`. Or copy the skill folder (.agents/skills/test-desktop-app in bholmesdev/hubble.md) into .agents/skills/test-desktop-app in your project. Codex loads it when a task matches its description.

Can I use Test Desktop App 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 bholmesdev/hubble.md --skill test-desktop-app -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/test-desktop-app, .gemini/skills/test-desktop-app, .github/skills/test-desktop-app and .opencode/skills/test-desktop-app in your project.

What does Test Desktop App need to run?

Going by SKILL.md and its folder, Test Desktop App needs the command-line tools its instructions call (pnpm).

Does Test Desktop App 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 Test Desktop App 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 Test Desktop App use?

Test Desktop App is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Test Desktop App use?

About 397 tokens (SKILL.md is roughly 1.6k 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 Test Desktop App?

Skills that share tags, products or a category with Test Desktop App: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 296k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Test Desktop App?

bholmesdev (a GitHub user) maintains it in bholmesdev/hubble.md, which has 1,483 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on October 1, 2026.

Source: bholmesdev/hubble.md on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.