Ios simulator debugger

iOS Simulator Debugger

Use XcodeBuildMCP for simulator control, build/run, UI inspection, screenshots, interaction, and logs.

If the user should see or interact with the running app, prefer ios-simulator-browser after this skill has selected or launched the Simulator. Keep this skill focused on build/run, logs, bundle IDs, UI tree inspection, and headless simulator automation.

Workflow

1. Discover a booted simulator with mcp__XcodeBuildMCP__list_sims. If none is booted, ask the user to boot one unless they asked you to boot it.
2. Set defaults with mcp__XcodeBuildMCP__session-set-defaults: projectPath or workspacePath, scheme, simulatorId, optional configuration: "Debug" and useLatestOS: true.
3. Build/run with mcp__XcodeBuildMCP__build_run_sim when requested. If the build fails, inspect output and retry only when justified, optionally with preferXcodebuild: true.
4. After a successful run, verify launch with mcp__XcodeBuildMCP__describe_ui or mcp__XcodeBuildMCP__screenshot before UI interaction.
5. If only launch is requested, use mcp__XcodeBuildMCP__launch_app_sim. If bundle id is unknown, call mcp__XcodeBuildMCP__get_sim_app_path then mcp__XcodeBuildMCP__get_app_bundle_id.

Interaction

• Describe before acting: mcp__XcodeBuildMCP__describe_ui.
• Tap by id or label first; coordinates only when needed.
• Type after focusing a field with mcp__XcodeBuildMCP__type_text.
• Use mcp__XcodeBuildMCP__gesture for scrolls and edge swipes.
• Capture visual proof with mcp__XcodeBuildMCP__screenshot.

Logs

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

Troubleshooting

Wrong app means verify scheme/bundle id. Non-hittable elements require fresh describe_ui after layout changes. Do not keep interacting after an unhandled build or launch failure.