Will installing Arness mess up my existing project?

[fredcallagan]

No. Arness is non-invasive by design. Everything it creates lives in a .arness/ directory at your project root — specs, plans, reports, templates. It also appends a ## Arness config section to your CLAUDE.md. It does not modify your source code, build configs, or CI/CD pipelines during setup.

There's no "init" requirement either. Every entry-point skill (/arn-planning, /arn-implementing, etc.) auto-configures with sensible defaults on first run — it detects your stack, patterns, and testing framework automatically.

To uninstall, remove the .arness/ directory and the ## Arness section from CLAUDE.md. No lockfiles, no global state, no daemon processes. Your code is unchanged.