Xcode Run Simulator

Community

xenodium

xcode-run-simulator

This skill should be used when the user invokes "/xcode-run-simulator" to build the current Xcode project, install the app on an iOS Simulator, and launch it.

Overview

Publisher	xenodium
Repository	`emacs-skills`
Skill name	`xcode-run-simulator`
Stars	148
Forks	18
Bundled files	Instructions only
Links	Skill source Repository

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
Self-contained
Everything the model needs lives in the instructions — no extra files to sync.
Open source
Published by xenodium on GitHub. Read the source before you install it.

Installation

Install the Xcode Run Simulator AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/xenodium/emacs-skills/tree/main/skills/xcode-run-simulator
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/xenodium/emacs-skills.git /tmp/emacs-skills
mkdir -p .claude/skills
cp -r /tmp/emacs-skills/skills/xcode-run-simulator .claude/skills/xcode-run-simulator

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Xcode Run Simulator in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Xcode Run Simulator on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Xcode Run Simulator is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Build + run on iOS Simulator

Build the Xcode workspace or project under the current working directory and launch it on an iOS Simulator. If a simulator is already booted, that one is used. Otherwise the latest available iPhone simulator is booted automatically and Simulator.app is brought to the foreground.

How to run

The shared agent-skill-xcode.el lives in the sibling xcode-shared directory at skills/xcode-shared/agent-skill-xcode.el in the emacs-skills plugin. All four /xcode-* skills load it from there.

sh
emacsclient --eval "(progn (load \"/path/to/skills/xcode-shared/agent-skill-xcode.el\" nil t) (agent-skill-xcode-run-simulator :project-dir \"$(pwd)\"))"

The function:

Locates the workspace/project and picks a scheme (same heuristic as /xcode-build-simulator).
Picks a simulator: first booted iOS simulator if any; else the latest available iPhone (boots it and opens Simulator.app).
Runs xcodebuild build against the simulator's specific UDID.
Reads BUILT_PRODUCTS_DIR / WRAPPER_NAME / PRODUCT_BUNDLE_IDENTIFIER from -showBuildSettings -json.
Installs (xcrun simctl install) and launches (xcrun simctl launch).
Returns a multi-line status string with the bundle id, simulator UDID, .app path, install result, and launch result. On build failure, returns the same error format as /xcode-build-simulator.

Rules

Pass the agent's current working directory as :project-dir via $(pwd).
The shared elisp lives under xcode-shared/agent-skill-xcode.el — load it from there.
Run via the Bash tool with a single emacsclient --eval invocation. Builds can take minutes; consider extending the Bash timeout if known to be slow.
Report the returned status string verbatim. It already contains everything the user needs.
Do not try to choose a different simulator if one is already booted — the whole point is reuse.
If the build fails, point at the truncated tail in the output; do not re-run the build.

Frequently asked questions

What does the Xcode Run Simulator AI skill do?

This skill should be used when the user invokes "/xcode-run-simulator" to build the current Xcode project, install the app on an iOS Simulator, and launch it.

Why use Xcode Run Simulator on TypingMind?

Because you install it once and use it with any model. Xcode Run Simulator is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Xcode Run Simulator in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/xenodium/emacs-skills/tree/main/skills/xcode-run-simulator. TypingMind reads its SKILL.md and installs it as a skill you can enable per chat.

Which AI models can use Xcode Run Simulator?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Xcode Run Simulator?

As many as you like. As long as a model supports skills, you can use Xcode Run Simulator with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Xcode Run Simulator AI skill free?

It is published on GitHub by xenodium. Check the repository for licensing terms. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Build + run on iOS Simulator

How to run

Rules

Frequently asked questions

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