GTM API / Change antidetect browser proxy

Change the proxy of an existing antidetect browser, country included. Supply EXACTLY ONE source: antidetect_browser_proxy_sid, proxy_country_code or custom_proxy_config. EVERY arm needs browser_owner=platform or adopted: a profile you own at GoLogin keeps its proxy there (422 managed_proxy_forbidden_for_owner / 422 custom_proxy_forbidden_for_owner). custom_proxy_config is probed first (422 custom_proxy_unreachable_* changes nothing), takes the exit country measured there, and RELEASES any armed 5G slot. Zero sources 422 proxy_assignment_missing, more than one 422 proxy_assignment_conflict, empty pool 422 proxy_pool_empty, 5G on a BYO proxy 422 proxy_5g_requires_managed_proxy. proxy_5g alone is a valid body: it moves the add-on binding only. DANGEROUS twice over: a location flip mid-campaign can trip a LinkedIn risk check, and a running browser is restarted, since a live session keeps the old proxy until it respawns. Read result.restarted. To rotate the IP in place, use replace_antidetect_browser_proxy. Contract: - MCP tool update_antidetect_browser_proxy, registry package mcp.linkedin/antidetect_browsers, mount linkedin.browsers. - Operation action, response envelope action. - Flags: dangerous: the MCP layer gates it behind a preview/commit token, and the effect cannot be undone through this API.