AgentSearch

{
  "protocolVersion": "0.3.0",
  "name": "AgentSearch",
  "description": "Find AI agents and MCP servers by natural-language query. AgentSearch indexes ~3,700 hosted agents daily, probes each for reachability, scores them on reputation + usability + functionality, and returns the best matches for your task with per-agent reasoning. Use it to answer 'is there an agent that does X?' or 'is this specific agent any good?'. Read-only, free, no auth.",
  "url": "https://agentsearch.luthersystems.com/api/a2a",
  "version": "0.1.0",
  "provider": {
    "organization": "Luther Systems",
    "url": "https://luthersystems.com"
  },
  "documentationUrl": "https://github.com/luthersystems/agentsearch",
  "homepage": "https://agentsearch.luthersystems.com",
  "license": {
    "spdx_id": "MIT",
    "name": "MIT License",
    "url": "https://github.com/luthersystems/agentsearch/blob/main/LICENSE"
  },
  "pricing": {
    "model": "free",
    "rateLimit": "best-effort, ~60 requests per minute per IP"
  },
  "securitySchemes": {
    "public": {
      "type": "none",
      "description": "All endpoints are publicly readable, no auth required."
    }
  },
  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "stateTransitionHistory": false
  },
  "additionalInterfaces": [
    {
      "transport": "jsonrpc",
      "url": "https://agentsearch.luthersystems.com/api/a2a"
    },
    {
      "transport": "mcp-streamable-http",
      "url": "https://agentsearch.luthersystems.com/api/mcp"
    },
    {
      "transport": "mcp-stdio",
      "url": "npx://-y/@luthersystems/agentsearch"
    }
  ],
  "defaultInputModes": [
    "text/plain",
    "application/json"
  ],
  "defaultOutputModes": [
    "application/json"
  ],
  "skills": [
    {
      "id": "search",
      "name": "Search the agent index",
      "description": "Take a natural-language query and return the top ranked agents/MCP servers from the index, with per-agent reasoning. Ranked by final_score = query_fit \u00d7 agent_quality.",
      "tags": [
        "search",
        "discovery",
        "ranking",
        "agent-discovery",
        "mcp-discovery"
      ],
      "examples": [
        "find an agent that reads invoice PDFs",
        "what MCP server lets me control a browser",
        "agents for crypto price lookup"
      ],
      "inputModes": [
        "text/plain",
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "agent_details",
      "name": "Get a scored agent profile",
      "description": "Return the full scored profile for one named indexed agent: inventory data, layer-by-layer scores (Fame / Usability / Functionality / Call Graph), reasoning, and live blocker status.",
      "tags": [
        "details",
        "profile",
        "scoring"
      ],
      "examples": [
        "details for upstash/context7",
        "how does taylorwilsdon/google_workspace_mcp score",
        "show me the Fame breakdown for a2aproject/A2A"
      ],
      "inputModes": [
        "text/plain",
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "found_agent",
      "name": "Live-score an arbitrary agent URL",
      "description": "Crawl + probe + LLM-score an arbitrary agent URL using the same rubric the batch pipeline uses. Works for agents not (yet) in the index.",
      "tags": [
        "scoring",
        "live",
        "probe",
        "agent-evaluation"
      ],
      "examples": [
        "score https://github.com/example/new-mcp-server",
        "evaluate https://some-new-agent.com against the query 'edit calendar events'",
        "is https://acme.com/agent/api any good?"
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "browse",
      "name": "Browse the full index",
      "description": "Paginated list of every indexed agent, ranked by overall quality.",
      "tags": [
        "browse",
        "list",
        "rank"
      ],
      "examples": [
        "top 50 agents by overall score",
        "page 5 of the index",
        "list everything ranked"
      ],
      "inputModes": [
        "text/plain",
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "stats",
      "name": "Index summary stats",
      "description": "Distributions, top categories, and the agent-to-agent call graph for the whole index.",
      "tags": [
        "stats",
        "rollups",
        "graph"
      ],
      "examples": [
        "how many agents are reachable right now?",
        "what are the top capability clusters?",
        "license breakdown across the index"
      ],
      "inputModes": [
        "text/plain",
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    }
  ]
}