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feat: Add DNS-AID tools for agent discovery via DNS #4859
Description
Feature Request
Add DNS-AID (DNS-based Agent Identification and Discovery) tools to Google ADK, enabling agents to discover, publish, and unpublish other agents via DNS SVCB records.
Motivation
AI agent ecosystems need a decentralized, standards-based discovery mechanism. DNS-AID (IETF draft-mozleywilliams-dnsop-dnsaid-01) uses DNS SVCB records to publish agent metadata — capabilities, endpoints, protocols, and versions — making agents discoverable without centralized registries.
Google ADK already supports A2A (Agent-to-Agent) protocol. DNS-AID complements A2A by providing the discovery layer: agents publish their A2A endpoints to DNS, and other agents find them via standard DNS queries. This enables:
- Decentralized discovery: No central registry needed
- DNS-native: Leverages existing DNS infrastructure, caching, and security (DNSSEC)
- A2A bridge: DNS-discovered agents with
protocol=a2acan be converted to ADKRemoteAgentreferences
Proposed Implementation
- FunctionTool wrappers:
discover_agents,publish_agent,unpublish_agentasync functions wrapped asFunctionToolobjects - Tool factory:
get_dns_aid_tools(backend_name=...)for convenient tool creation with DNS backend binding - A2A bridge:
a2a_agent_from_record()to convert DNS-AID discovered agents into ADK-compatible RemoteAgent references
Related PR
PR #4856 implements this feature.
Activity
klateefa commentedon Mar 18, 2026
@IngmarVG-IB Thank you for submitting this feature request. It’s currently under review by our team, and I’ll keep you posted on any updates. We appreciate your input!
GWeale commentedon Sep 16, 2026
the pull request implementing this was closed on 13 august, and this issue tracks the same work.
the reason isn't that integrations don't belong here — the directory holds plenty and your revision followed its guidelines. it's that dns-aid is still an ietf draft, and discovery would be tested against live dns we don't control. functiontool, remotea2aagent and mcptoolset are public, so a separate package gives the same thing. closing; open a new issue if the draft lands.