What is ios-debugger-agent?

A guide for building, running, and debugging an iOS app with XcodeBuildMCP. Xcode is Apple’s development environment, and a simulator runs an iOS app without a physical device.

It helps find a simulator, configure the project, build and launch the app, inspect its on-screen state, interact with it, and capture runtime logs.

It gives a consistent process for checking the app on a booted simulator and investigating problems using build output and logs.

ios-debugger-agent — Skill for Claude Code and Codex by dagba: A guide for building, running, and debugging an iOS…

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/dagba/ios-mcp/ios-debugger-agent

Any agent

npx skills add dagba/ios-mcp --skill ios-debugger-agent

Clone the repo

git clone --depth 1 https://github.com/dagba/ios-mcp

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/dagba/ios-mcp/ios-debugger-agent.svg)](https://agentmods.dev/skills/dagba/ios-mcp/ios-debugger-agent)

Your own site

<a href="https://agentmods.dev/skills/dagba/ios-mcp/ios-debugger-agent"><img src="https://agentmods.dev/badge/skills/dagba/ios-mcp/ios-debugger-agent.svg" alt="Measured on agentmods" height="20"></a>

Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 667 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin 98% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00070	$0.00667
Opus 5	$0.00035	$0.00333
Sonnet 5	$0.00014	$0.00133
Haiku 4.5	$0.00007	$0.00067

Measured 4d ago against content hash 9e1e4e7746db, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ios-debugger-agent scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

98% identical to ios-debugger-agent — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/ios-debugger-agent/SKILL.md · 50 lines

How it starts

The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.

iOS Debugger Agent

Overview

Use XcodeBuildMCP to build and run the current project scheme on a booted iOS simulator, interact with the UI, and capture logs. Prefer the MCP tools for simulator control, logs, and view inspection.

Core Workflow

Follow this sequence unless the user asks for a narrower action.

1) Discover the booted simulator

Call mcp__XcodeBuildMCP__list_sims and select the simulator with state Booted.
If none are booted, ask the user to boot one (do not boot automatically unless asked).

2) Set session defaults

Call mcp__XcodeBuildMCP__session-set-defaults with:
- projectPath or workspacePath (whichever the repo uses)
- scheme for the current app
- simulatorId from the booted device
- Optional: configuration: "Debug", useLatestOS: true

3) Build + run (when requested)

Call mcp__XcodeBuildMCP__build_run_sim.
If the app is already built and only launch is requested, use mcp__XcodeBuildMCP__launch_app_sim.
If bundle id is unknown:
1. mcp__XcodeBuildMCP__get_sim_app_path
2. mcp__XcodeBuildMCP__get_app_bundle_id

UI Interaction & Debugging

Use these when asked to inspect or interact with the running app.

Describe UI: mcp__XcodeBuildMCP__describe_ui before tapping or swiping.
Tap: mcp__XcodeBuildMCP__tap (prefer id or label; use coordinates only if needed).
Type: mcp__XcodeBuildMCP__type_text after focusing a field.
Gestures: mcp__XcodeBuildMCP__gesture for common scrolls and edge swipes.
Screenshot: mcp__XcodeBuildMCP__screenshot for visual confirmation.

Logs & Console Output

Start logs: mcp__XcodeBuildMCP__start_sim_log_cap with the app bundle id.
Stop logs: mcp__XcodeBuildMCP__stop_sim_log_cap and summarize important lines.
For console output, set captureConsole: true and relaunch if required.

Troubleshooting

If build fails, ask whether to retry with preferXcodebuild: true.
If the wrong app launches, confirm the scheme and bundle id.
If UI elements are not hittable, re-run describe_ui after layout changes.

Read the full file on GitHub · 50 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

4d ago First seen · 50 lines · 70 tokens per session scan A 9e1e4e7746db

Subscribe to this mod's changes

ios-debugger-agent is a skill published in the GitHub repository dagba/ios-mcp (3 stars, last pushed 7mo ago), licensed MIT. It adds 70 tokens to every session and 667 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 98% identical to ios-debugger-agent, differing in 2 lines, and is treated as a copy.

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