For custom sites we'll post to via their own API — there's no wired-in publisher for these, so this is where the site owner documents how to actually post there (auth, endpoints, payload shape). Shown in the UI for non-WordPress sites, exposed via the JSON API, and pointed to from AI_API.md's "any other network/CMS" fallback section so an agent checks it before improvising. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>