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Agent skill

Horizon App Testing

by peters in peters/horizon

Run or inspect declared iOS and Android native app tests through Horizon devicetestrun and app MCP tools.

MITAuto-check passedAgent Workflows

Install Horizon App Testing

skills CLI
$ npx skills add peters/horizon --skill horizon-app-testing -a claude-code

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

GitHub CLI
$ gh skill install peters/horizon horizon-app-testing --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/peters/horizon.git skills-src && mkdir -p .claude/skills && cp -r skills-src/assets/plugins/codex/skills/horizon-app-testing .claude/skills/horizon-app-testing && 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
horizon-app-testing
GitHub stars
715
Token cost
~277 tokens
SKILL.md length
120 words
Files
2 (incl. references)
Skills in repo
6
Repo updated
First seen
Licence
MIT

At a glance

Run or inspect declared iOS and Android native app tests through Horizon devicetestrun and app MCP tools.

  • App Automate sessions
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Desktop fixtures use horizon-device

What it does

Horizon App Testing is an agent skill from peters/horizon. Run or inspect declared iOS and Android native app tests through Horizon devicetestrun and app MCP tools. Use for App Automate sessions, native actions, evidence, and cleanup; desktop fixtures use horizon-device.

Its SKILL.md is about 280 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/native-apps.md`).

It sits in Agent Workflows, covering MCP servers. It works with Android, iOS and Model Context Protocol. The repository describes itself as: GPU-accelerated terminal board that puts all your sessions on an infinite canvas. The licence is MIT.

When your agent uses it

  • App Automate sessions
  • Desktop fixtures use horizon-device

Example prompts

  • “/horizon-app-testing”

What it can do on your machine

Read from SKILL.md and the folder at commit f10c852. 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

Horizon App Testing loads about 277 tokens when it runs, and up to ~1.6k if it reads all its reference files. Until then it costs about 59 tokens; SKILL.md has 120 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~59
When it runs · the whole SKILL.md, loaded when a task matches
~277
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.6k

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

The full file from peters/horizon at commit f10c852, republished under its MIT licence (© peters). 120 words, ~277 tokens.

Download SKILL.mdSave it as .claude/skills/horizon-app-testing/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
horizon-app-testing
description
Run or inspect declared iOS and Android native app tests through Horizon device_test_run and app_* MCP tools. Use for App Automate sessions, native actions, evidence, and cleanup; desktop fixtures use horizon-device.

Horizon native app testing

Use the separately configured native MCP server for declared iOS and Android tests. Read the app and companion backend instructions before a device run. Read the native app reference for prerequisites, interactive sessions, evidence, and recovery. Use current MCP schemas for arguments.

Use only the approved native device quota and declared loopback ports. A browser quota does not authorize native devices. Keep provider credentials in Horizon. Use one immutable artifact per platform per run and isolated synthetic backends. Observe interactive tests through a live native Device panel in the current workspace. Use horizon-device for viewer presentation checks; use app_* for native input. Do not send native input through a browser or through a viewer's Interact toggle.

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

Files

SKILL.md and 1 other file (references) in assets/plugins/codex/skills/horizon-app-testing of peters/horizon.

  • SKILL.md
  • references/native-apps.md

Open the folder on GitHubat commit f10c852

Compare with similar skills

Horizon App Testing 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.

Horizon App Testing compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Horizon App Testing this skillpeters/horizon715—~277Automated safety check: PassMIT
Solomdzhitongblog/solomd1.2k—~2kAutomated safety check: PassMIT
Iphone Useleeguooooo/iphone-use119—~2.7kAutomated safety check: PassMIT
MCP Setupqianyumeng0228/ShizukuX118—~289Automated safety check: PassApache-2.0
Penpot Uiux Designgithub/awesome-copilot40k1 repos~3kAutomated safety check: PassMIT
Scrcpy GotchasJuanCF/scrcpy-mcp113—~5.8kAutomated safety check: PassMIT

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  • Horizon Speech

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  • Horizon Cast

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  • Horizon Browser

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    Control, inspect, or audit Horizon browser panels through public browser MCP tools.

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  • Horizon Cloud

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    Inspect Horizon cloud offers and companions, control explicitly authorized companion workers, use a worker Local Network Bridge, or ask for GitHub access from a cloud worker through public MCP tools.

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Works with

Categories

Questions about Horizon App Testing

What does Horizon App Testing do?

Run or inspect declared iOS and Android native app tests through Horizon devicetestrun and app MCP tools. Horizon App Testing is an agent skill from peters/horizon. Run or inspect declared iOS and Android native app tests through Horizon devicetestrun and app MCP tools.

When should I use Horizon App Testing?

Horizon App Testing fits situations like: app Automate sessions; desktop fixtures use horizon-device.

How do I install Horizon App Testing in Claude Code?

Run `npx skills add peters/horizon --skill horizon-app-testing -a claude-code`. Or copy the skill folder (assets/plugins/codex/skills/horizon-app-testing in peters/horizon) into .claude/skills/horizon-app-testing in your project. Claude Code loads it when a task matches its description.

How do I install Horizon App Testing in Codex?

Run `npx skills add peters/horizon --skill horizon-app-testing -a codex`. Or copy the skill folder (assets/plugins/codex/skills/horizon-app-testing in peters/horizon) into .agents/skills/horizon-app-testing in your project. Codex loads it when a task matches its description.

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

What does Horizon App Testing need to run?

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

Does Horizon App Testing 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 Horizon App Testing 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 Horizon App Testing use?

Horizon App Testing 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 Horizon App Testing use?

About 277 tokens (SKILL.md is roughly 1.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.3k tokens, read only when the agent opens those files.

What are the alternatives to Horizon App Testing?

Skills that share tags, products or a category with Horizon App Testing: Solomd (zhitongblog/solomd, 1.2k stars), Iphone Use (leeguooooo/iphone-use, 119 stars), MCP Setup (qianyumeng0228/ShizukuX, 118 stars) and Penpot Uiux Design (github/awesome-copilot, 40k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Horizon App Testing?

peters (a GitHub user) maintains it in peters/horizon, which has 715 GitHub stars. The repository holds 6 skills in this directory. The repository was last updated on October 9, 2026.

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