stealthstack.ai Status Publish a catalog

Agent discovery

Resources for finding agents, MCP servers, skills and APIs.

They cover registries and directories, ARD and ai-catalog files, site-wide discovery documents and meta-search across tools.

Listings are what publishers declare in their ARD catalogs and the registries StealthStack reads. The category and summaries are our reading of each listing. Each listing links to its own page with the publisher's endpoint.

All types MCP serversSkillsA2A agentsAPIs
Registries and directoriesCatalogs and manifestsMeta-searchAgent-readiness docs
  1. REGISTRYStealthStack — Open-Web ARD Index Open-web ARD registry search API; keyless, free, 60 requests/min per IP.
  2. A2A AGENTAgentSearch Searches ~3,700 hosted agents and MCP servers by task with scored matches.
  3. REGISTRYWellknown Registry Open registry of agent-callable services; any domain can submit, no paid ranking.
  4. A2A AGENTAgentry Directory to search, compare and register AI agents with DID identity and payments.
  5. SKILLFind Skills Skill helping users discover and install agent skills for a task.
  6. MCP SERVERStealthStack ARD Discovery MCP server to search the StealthStack index of ARD agents, MCP servers and skills.
  7. A2A AGENTallagents Directory of 2,000+ AI agents by specialty; free self-listing, no account.
  8. SKILLardvark CLI crawler, verifier and indexer for ARD ai-catalog.json documents.
  9. MCP SERVERSato Hub — build your onchain agent Daily-scored directory of onchain agent frameworks, MCP servers, wallets and rails.
  10. REGISTRYPickrate Agent Registry ARD registry of developer and SaaS tools ranked by how often agents pick them.
  11. A2A AGENTClawdChat 虾聊 Agent social network and A2A registry hosting 11,558 agent identities.
  12. MCP SERVERomgskills Catalog MCP Read-only server for discovering public agent skills in the omgskills catalog.
  13. SKILLsearch-skills Skill to search SkillsMP for installable agent skills by task or category.
  14. REGISTRYHugging Face Discover Registry Searches indexed Hugging Face skills, Space skills and MCP-enabled Spaces.
  15. A2A AGENTb0tl1nk Directory of applications for AI agents; search, inspect and publish signed listings.
  16. APIARD manifest validator Validates an ARD manifest against spec v0.91.
  17. SKILLardvark CLI skill Skill teaching an agent to install and run the ardvark ARD crawler and verifier.
  18. MCP SERVERDesvela Preflight — free MCP server Free, no-token check of a domain's AI crawler rules and agent-facing files.
  19. MCP SERVERNeuronto ARD Registry: Agentic Resource Discovery (ARD) Index Search across public ARD registries and 200,000+ MCP tools.
  20. MCP SERVERAgentry — AI Agent Registry & Discovery Agent registry with DID/Nostr identity, trust scoring and Lightning/Cashu settlement.
  21. MCP SERVERQuietforge x402 Tools (free MCP server) Free MCP server to search a health-probed directory of live x402 endpoints.
  22. SKILLfinding-google-skills Skill that locates and loads Google product skills from a remote catalog index.
  23. MCP SERVERregistry-lag Checks how quickly MCP directories list a newly submitted server.
  24. SKILLlist-categories Skill to browse SkillsMP category slugs before searching for skills.
  25. SKILLget-skill-detail Skill to inspect one SkillsMP catalog entry and its source repo before installing.
  26. MCP SERVERbotmarket Searches agents, MCP servers, protocols, payment services and quests.
  27. MCP SERVERVend MCP/x402 Service Finder (x402, Nano) Finds paid MCP and x402 services for a task; 0.0001 XNO per call via x402.
  28. A2A AGENTRegistry Lag Checks how quickly MCP directories list a newly submitted server.
  29. SKILLdiscover-azure-skills Skill that searches the Azure skills catalog and recommends installable skills.
  30. MCP SERVERardvark MCP server Server in the ardvark CLI for crawling and searching indexed ARD catalogs.
  31. MCP SERVERBro Find AI MCP Server Searches a directory of 550+ AI tools and MCP servers by category and pricing.
  32. SKILLARD Skill Builder Skill for authoring and validating ARD-1 SKILL.md files for the StealthStack catalog.
  33. REGISTRYSnowSure ARD Discovery Registry Natural-language registry search for ski and snow MCP servers, APIs and answer engines.
  34. SKILLGH Skill Skill for discovering, installing, updating and publishing agent skills with gh skill.
  35. MCP SERVERRevuo — B2B SaaS directory B2B SaaS directory with capability claims, rankings and an MCP server directory.
  36. MCP SERVERZaira Guide MCP Server Searches and compares 900+ evaluated developer tools with readiness scores.
  37. REGISTRYZendesk internal agent registry Registry of Zendesk-owned A2A agents; OAuth required, filtered by grant.
  38. SKILLsuggest-awesome-github-copilot-agents Suggests GitHub Copilot custom agent files from awesome-copilot for a repository.
  39. A2A AGENTSynthfolk Profiles for agents and people with work history, skills and hiring via API and MCP.

Related categories

AI models and MLOpsAgent memory and contextAgent orchestrationAgent trust and governanceAgent payments All categories