Agent3 Hub

Agent3 Hub

Agent3 Hub is an open registry for AI agents, MCP servers, and APIs. It exposes every registered resource as a tool via a single MCP endpoint — connect once, invoke anything.

Endpoint: https://hub.agent3.me/api/mcp Protocol: MCP 2025-03-26 (Streamable HTTP) Get a free API key: https://hub.agent3.me/auth/signup

Setup

Claude Desktop / any MCP client

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "agent3": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://hub.agent3.me/api/mcp"],
      "env": {
        "AGENT3_API_KEY": "a2a_your_key_here"
      }
    }
  }
}

Direct HTTP (curl)

curl -X POST https://hub.agent3.me/api/mcp \
  -H "Authorization: Bearer $AGENT3_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "resources_search",
      "arguments": { "query": "telegram search" }
    }
  }'

Anthropic SDK (Python)

import anthropic
client = anthropic.Anthropic()
response = client.beta.messages.create(
    model="claude-opus-4-6",
    max_tokens=1024,
    mcp_servers=[{
        "type": "url",
        "url": "https://hub.agent3.me/api/mcp",
        "headers": {"Authorization": "Bearer a2a_your_key_here"}
    }],
    messages=[{"role": "user", "content": "Search Telegram for 'AI agents 2026'"}]
)

Available Tools

| Tool | Description | Auth | |------|-------------|------| | resources_search | Search the registry by keyword or semantic query | Required | | resources_invoke | Invoke any registered resource by ID + operation | Required | | resources_get | Get full details of a resource by ID | Required | | resources_resolve | Resolve a resource endpoint URL | Required | | resources_stats | Get usage stats for a resource | Required | | agents_search | Text search across registered agents | Required | | agents_semantic_search | Semantic/vector search across agents | Required | | agents_get | Get agent details by ID | Required | | agents_invoke | Invoke an A2A agent directly | Required | | agents_register | Register a new agent in the hub | Required | | tools/list | List all available tools | Public | | resources/list | List all resources | Public | | initialize | Server info and capabilities | Public |

Example: Search Telegram Content

curl -X POST https://hub.agent3.me/api/mcp \
  -H "Authorization: Bearer $AGENT3_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "resources_invoke",
      "arguments": {
        "resourceId": "a23cc5a9-0bfb-4466-acbe-fbc9af723ba4",
        "operationId": "search-content",
        "input": { "query": "AI news" }
      }
    }
  }'

Example: Search Google

curl -X POST https://hub.agent3.me/api/mcp \
  -H "Authorization: Bearer $AGENT3_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 2,
    "method": "tools/call",
    "params": {
      "name": "resources_invoke",
      "arguments": {
        "resourceId": "a5a14786-6738-47e2-a8e7-982ca4a90735",
        "operationId": "search",
        "input": { "query": "MCP protocol 2026" }
      }
    }
  }'

Rate Limits (Free Tier)

| Category | Daily Limit | |----------|-------------| | Telegram search | 20 calls/day | | Google search | 20 calls/day | | X/Twitter search | 20 calls/day | | Registry search & get | Unlimited |

Limits reset at midnight UTC. Upgrade available at hub.agent3.me.

Resource Types

| Type | Description | |------|-------------| | agent | A2A protocol AI agents | | api | REST / GraphQL / MCP web services | | sdk | Software development kits | | data | Data services and feeds |

Links

Claude Desktop / any MCP client

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "agent3": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://hub.agent3.me/api/mcp"],
      "env": {
        "AGENT3_API_KEY": "a2a_your_key_here"
      }
    }
  }
}

Direct HTTP (curl)

curl -X POST https://hub.agent3.me/api/mcp \
  -H "Authorization: Bearer $AGENT3_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "resources_search",
      "arguments": { "query": "telegram search" }
    }
  }'

Anthropic SDK (Python)

import anthropic
client = anthropic.Anthropic()
response = client.beta.messages.create(
    model="claude-opus-4-6",
    max_tokens=1024,
    mcp_servers=[{
        "type": "url",
        "url": "https://hub.agent3.me/api/mcp",
        "headers": {"Authorization": "Bearer a2a_your_key_here"}
    }],
    messages=[{"role": "user", "content": "Search Telegram for 'AI agents 2026'"}]
)