# Build And Run > Build and launch the app locally on macOS for manual testing. Use when you need to visually verify UI changes or test the app interactively. Use when this capability is needed. - Skill: `tomevault-io/build-and-run` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/build-and-run` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/build-and-run/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/build-and-run --- Build and run the app locally on macOS: 1. Run `make mac_dev` from the project root 2. This compiles for arm64 and immediately launches the app 3. The app window will open - the user can interact with it to verify changes 4. The process blocks until the user closes the app window --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/mtmckenna) — claim your Tome and manage your conversions.