Most automation platforms hit a wall the moment a tool doesn't ship a clean API. Notion's database API skips half the block types. Reddit's API is enterprise-priced now. Your bank, your payroll system, your kid's school portal: none of them have an API at all.
Browser Control is the universal escape hatch. Behind the scenes, MoClaw spins up a real Chromium instance in a sandboxed cloud session. The model sees the rendered page (DOM and screenshots), reasons about what to click next, and drives the cursor exactly like a person would. When you log in once, the session keeps cookies for next time, so the AI doesn't have to ask for your password every run.
Use it when a tool you care about has no API, the API is locked behind a paid tier, or the API is missing the one field you actually need. Avoid it when a clean API exists, because Browser Control is slower and more brittle than calling an endpoint directly. MoClaw will pick the right approach automatically when both are available.