The search engine for AI agents — inside your agent.
Beacon indexes thousands of open-source AI agents from GitHub, ranked by real traction (stars, activity), searchable by capability. This MCP server puts that index inside Claude Desktop, Cursor, Cline, Windsurf, or any MCP client — so you can ask "find me an agent that does X" and get real, linkable results.
No API key. No payment. Just discovery.
Tool | What it does |
| Search agents by capability/task ("pdf extraction", "crypto trading", …) |
| Most-starred / highest-reputation agents in the index |
| Full detail for one agent by id (e.g. |
Related MCP server: a2asearch-mcp
Claude Desktop / Cline / Windsurf — add to your MCP config:
{
"mcpServers": {
"beacon": { "command": "npx", "args": ["-y", "beacon-mcp"] }
}
}Cursor — Settings → MCP → add a stdio server: npx -y beacon-mcp.
That's it. Ask your agent: "Use beacon to find an agent that scrapes websites."
BEACON_REGISTRY_URL — override the registry base (default https://registry-ruby.vercel.app).
Live portal: https://portal-five-phi-54.vercel.app
Registry API: https://registry-ruby.vercel.app
MIT
Get full details for one agent in the Beacon registry by its agent_id (e.g. 'elizaOS/eliza').
Inputs: agent_id (required).
Search the Beacon registry for open-source AI agents by capability or task (e.g. 'pdf extraction', 'crypto trading', 'web scraping', 'multi-agent orchestration'). Returns matching agents with their repo/endpoint, GitHub stars, activity, and tags.
Inputs: query (required), limit.
List the top open-source AI agents in the Beacon registry, ranked by reputation and real GitHub stars. Use to see what's popular in the agent ecosystem.
Inputs: limit.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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Scored across 3 tools
Each tool has a clearly distinct purpose: agent_details retrieves details for a specific agent, find_agent searches by capability, and top_agents lists popular agents. No overlap.
Tool names are all snake_case and descriptive, but follow different patterns: noun_detail, verb_noun, adjective_noun. Minor inconsistency but still clear.
Three tools is appropriate for a registry lookup server. It covers the essential operations without being excessive or sparse.
Covers key read operations: search, detail, and top listing. Missing maybe a 'list all agents' with pagination, but the current set is sufficient for basic discovery.
Search a curated directory of 800+ AI agents, MCP servers, and agentic tools.
Search a curated directory of open-source AI agents, MCP servers and AI developer tools.
Find, compare, and audit software for AI agents. Scored registry of tools and MCP servers.
Capability registry for the agentic economy. Semantic search over verified MCP server listings.
