Optionaladcp_Release-precision AdCP version (VERSION.RELEASE, e.g. "3.0", "3.1", "3.1-beta"). On a request: the buyer's release pin — the seller validates against its supported_versions and returns VERSION_UNSUPPORTED on cross-major mismatch, or downshifts to the highest supported release within the same major. On a response: the release the seller actually served — clients SHOULD validate the response against that release's schema, not against their pin. Patches are not negotiated; surface them as build_version on capabilities for operational visibility. When omitted, falls back to adcp_major_version (deprecated) or server default. Buyers SHOULD emit both adcp_version and adcp_major_version through 3.x to remain compatible with sellers that only read the legacy field. NORMALIZATION: SDKs that read full-semver values from bundle metadata (e.g. ComplianceIndex.published_version = "3.1.0-beta.1") MUST normalize to release-precision ("3.1-beta.1") before emitting on the wire — meta-field values are NOT valid wire values.
Optionaladcp_DEPRECATED in favor of adcp_version (release-precision string). Servers MUST continue to honor this field through 3.x. Removed in 4.0. Original semantics: the AdCP major version the buyer's payloads conform to. Sellers validate against their supported major_versions and return VERSION_UNSUPPORTED if unsupported. When omitted, the seller assumes its highest supported version.
Brand identifier from brand.json brands array
OptionalfieldsOptional identity sections to include in the response. When omitted, all sections the caller is authorized to see are returned. Core fields (brand_id, house, names) are always returned and do not need to be requested.
Optionaluse_Intended use case, so the agent can tailor the response. A 'voice_synthesis' use case returns voice configs; a 'likeness' use case returns high-res photos and appearance guidelines.
OptionalcontextOptionalext
Request brand identity data from a brand agent. Core identity (house, names, description, logos) is always public. Linked accounts get deeper data: high-res assets, voice configs, tone guidelines, and rights availability.