The request is for a general 'Agent Registry', so there is no named product. Google Agent Registry 1 is the most direct match: it registers, discovers and governs AI agents, MCP servers, endpoints and skills in one registry, with list, get and search operations. Alternatives that also catalog or index agent resources are Neuronto ARD Registry 9, Agent Nexus 4, Agent Manifest Protocol 3 and SIGNALS 8, which has an Agent Registry feature.
- 1
Google Agent Registrygoogleapis.comverified and signed
Registers, discovers and governs agents, MCP servers, endpoints and skills in one registry, with list, get and search actions on agents 1.
for agents: agentregistry.projects.locations.agents.list · agentregistry.projects.locations.agents.get · agentregistry.projects.locations.agents.search
- 2
Neuronto ARD Registryneuronto.comverified and signed
Federated index where one search finds MCP servers, skills and agents that can do a task across public ARD registries 9.
official:MCP server · Neuronto ARD Registry: Agentic Resource Discovery (ARD) IndexMCP server · Neuronto Payments: x402 facilitator and API gateway
for agents: Find an agentic resource · Registry statistics · Find a specific tool
- 3
Agent Nexusagentnexus.appverified and signed
Registry of APIs, MCP servers and CLIs that AI agents call, with a discovery action that ranks interfaces for a stated need 4.
official:MCP server · Agent Nexus
for agents: Read an interface contract · Discover a callable interface · Report an invocation outcome
- 4
Agent Manifest Protocolagent-manifest.comwebsite read, tools not yet checked
Open spec plus public registry and validator where agents read /.well-known/agent-manifest.json to discover APIs 3.
official:MCP server · Agent Manifest Protocol (AMP)package · Agent Manifest Protocol (AMP)
- 5
SIGNALSsignals.globalverified and signed
Loyalty platform with an Agent Registry feature to register, discover and manage autonomous AI agents 8.
official:MCP server · SIGNALS Loyalty Agent Platform+29 community tools built for it
for agents: Agent Registry · Skill Marketplace · Bounty Board
Sources
- 1Agent Registry overview | Google Cloud Documentationdocs.cloud.google.com · read 2026-10-29
- 3Agent Manifest Protocol — Spec, Registry & Validatoragent-manifest.com · read 2026-10-29
- 4Agent Nexus (agentnexus.app) — Infrastructure for AI agentsagentnexus.app · read 2026-10-29
- 8SIGNALSsignals.global · read 2026-10-29
- 9Neuronto ARD Registry: Agentic Resource Discovery (ARD) Indexneuronto.com · read 2026-10-29
For agents: the 10 actions behind this answer
agentregistry.projects.locations.agents.list · Agent Registry API verified and signed
Lists Agents in a given project and location.
docker-agent-deploy · docker-agent-deploy verified and signed
Use this skill when exposing a Docker Agent as a server (MCP, HTTP API, A2A, ACP, or OpenAI-compatible chat), distributing an agent via an OCI registry with `docker agent share`, or measuring agent quality with `docker agent eval`. Even if the user just says they want to "turn my agent into an MCP s
· Agent Manifest Protocol website read, tools not yet checked
AMP is an open spec plus public registry and validator. Agents discover APIs, read /.well-known/agent-manifest.json at the origin, check compliance, and integrate autonomously.
Read an interface contract · Agent Nexus (agentnexus.app) verified and signed
Full machine contract for one registry entry by slug. e.g. get the contract for resend-api
A2A Agent Registry · Agoragentic verified and signed
Query the full registry of A2A-compliant agents listed on Agoragentic. Returns Agent Cards for each active listing. e.g. List all A2A agents e.g. {"tags": ["security", "defi"]}
· Agent Papers website read, tools not yet checked
Agent Papers is the curated registry of agent personhood infrastructure: identity, phone, email, addresses, money, legal, and insurance for AI agents.
SAP Protocol Operations · SAP MCP Server verified and signed
Agent registry, identity, memory, reputation, execution proof, payments, and settlement tools.
Agent Registry · SIGNALS Agent API verified and signed
Register, discover, and manage autonomous AI agents
Find an agentic resource · Neuronto ARD Registry verified and signed
Search for an MCP server, skill, agent, API or other callable capability for a task, across this index and every other public ARD registry at once. Returns ranked matches with the endpoint to connect to and which registries carry each result. The score is relevance only, never a trust or safety rati
· Agent-2-Agent.com website read, tools not yet checked
A decentralized data registry and API marketplace built exclusively for AI agents, shopping bots, and crawlers. List products in JSON, query and search programmatically.
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.