Browse the ComOS network's composable platforms as a recursive catalog. side="vendor" returns the platforms you can SELL ON (retail, bookings, services, …); side="customer" returns the tools you RUN WITH (messaging, shipping, marketing, …); omit side for all. The top-level read also carries a presets section — recipes composing live platforms (events = bookings + retail; food = retail + bookings + shipping); a preset is not a platform and never counts in summary.total (CO 455). parent="<key>" descends into a platform's sub-catalog — e.g. parent="messaging" returns its channels (email, sms, dm). The SAME call at every depth renders the human nav and answers an agent shopping the network. Pairs with federation_catalog_agents: platforms are what you become; agents are the operators you hire to run them. Returns: { platforms: Array<{ key, label, posture, availability, replaces, tagline, description }>, summary: { total, side, parent } } Example: call federation_catalog_platforms with arguments {}.