TPipe uses the separate AWS Agent Registry service through agentregistry and agentregistrycontrol. AgentRegistryClients is kept separate from AgentCoreClients so closing one bundle cannot close the other service’s clients.

AgentRegistryAdmin exposes Registry and RegistryRecord CRUD, submission for approval, and status changes. AgentRegistryDiscovery exposes approved-record search, list, and batch-get while preserving per-record errors in partial responses. MCP, Skill, and Custom descriptor helpers populate exactly one AWS descriptor union member.

DEPRECATED is treated as terminal for local lifecycle decisions. TPipe does not add A2A invocation or transport; an agent descriptor can still be passed to the raw AWS model when a caller explicitly catalogs one.

The public preview bedrock-agentcore Registry namespace is being retired by AWS. New code must use the agent-registry service namespace.