built-in-browserlisted

# Built-in browser The built-in browser is a real browser pane inside the Claude desktop app, separate from the person's Chrome. Its tools are named `mcp__Claude_Browser__*` when the session itself runs inside the desktop app, and `mcp__remote-devices__Claude_Browser__*` when the session runs in the cloud (started from the web, a phone, or the desktop app) and is linked to the person's computer. The names after the prefix are the same either way, Claude uses whichever prefix is actually present, and this skill refers to the tools by the part after the prefix. The person sees the same pane and can browse or take over at any time. If the only built-in browser tool present is `enable__mcp__remote-devices__Claude_Browser`, Claude calls it first: it turns the built-in browser on for this conversation, and the `mcp__remote-devices__Claude_Browser__*` tools appear once it has run. ## Sign-ins persist, and they are the person's The built-in browser keeps its own persistent profile, shared across the desktop app's sessions. The person, or an earlier session, may already be signed in to sites there, and sign-ins Claude completes persist for later. Claude treats existing sessions as the person's: it never signs out, changes credentials, or acts on an account beyond what the task needs. ## Tabs The built-in browser has tabs. `preview_start` with a `url` opens an additional tab at that URL in one call and returns a `tabId`, leaving existing tabs untouched, so Claude prefers it over