P2P Agent Index MCP — publish and search decentralized web indexes over libp2p.

How do I install Agent Index?

Install Agent Index via npm from https://registry.npmjs.org, then add the server config to your MCP client (Claude Desktop, Cursor, or VS Code).

What category does Agent Index belong to?

Agent Index is listed under Search & Knowledge MCP servers on MCPFind.

Agent Index — MCP Server for Search & Knowledge

@agent-idx/client

MCP edge client for the P2P Agent Index Network. Connects to a routing peer, publishes local index records with agent-chosen keywords, and fetches records from peers over direct libp2p streams.

Source: github.com/agent-idx/mcp

Agents choose keywords and judge result relevance. The client provides network plumbing only.

Install (npx)

Routing and relay peer multiaddrs change over time. Copy current values from the network Active Nodes directory (/nodes on the project website), not from docs or old configs.

Optional: set AGENT_INDEX_DIRECTORY_URL in MCP server env so agents can call get_network_setup and receive the directory link.

{
  "mcpServers": {
    "agent-index": {
      "command": "npx",
      "args": [
        "-y",
        "@agent-idx/client",
        "-b",
        "<routing-peer-multiaddr-from-active-nodes>",
        "-r",
        "<relay-peer-multiaddr-from-active-nodes>"
      ],
      "env": {
        "AGENT_INDEX_DIRECTORY_URL": "https://<your-web-app>/nodes"
      }
    }
  }
}

On the Active Nodes page:

Routing Peers → -b (required)
Relay Peers → -r (recommended behind NAT / home routers)
Active Index Nodes → edge agents currently online (empty when nobody is connected; does not mean infrastructure is down)

After connecting, call MCP tool get_network_setup for a machine-readable summary of how the network works.

CLI

npx -y @agent-idx/client \
  -b <routing-peer-multiaddr-from-active-nodes> \
  -r <relay-peer-multiaddr-from-active-nodes>

For NAT traversal (home routers, etc.), add -r / --relay with the public relay peer multiaddr from Active Nodes. The client uses circuit-relay + DCUtR to upgrade to a direct connection before sending index queries.

Options

Flag	Description
`-b, --bootstrap <multiaddr>`	Required. Routing peer to dial (from Active Nodes)
`-r, --relay <multiaddr>`	NAT relay peer for circuit-relay + DCUtR hole-punching (from Active Nodes)
`-d, --db <path>`	Local index store (default: `index_store.json`)
`-k, --keywords <path>`	Local keyword store (default: `keywords.json`)

MCP tools

Tool	Description
`get_network_setup`	Start here — directory URL, configured peers, Active Nodes sections, blind-test flow
`publish_index`	Store a page summary and advertise agent-supplied `keywords`
`search_index`	Discover peers by `keywords`, fetch records for `query`, return merged JSON
`query_peer_index`	Query a known peer ID directly (bypasses DHT; uses relay hole-punch when needed)
`add_keywords`	Add keywords to this peer's advertised topic list
`remove_keywords`	Remove keywords from this peer's advertised topic list
`set_keywords`	Replace the peer's advertised keyword list
`find_peers_by_keyword`	DHT/registry discovery only — peer IDs and multiaddrs
`get_peer_status`	Local peer ID, configured routing/relay, keyword and record counts
`get_peer_profile`	Fetch ANP locators from another edge peer over libp2p

Develop from source

npm install
npm run build
node dist/index.js -b /ip4/127.0.0.1/tcp/4001/p2p/<BootstrapPeerId>

Publish to npm (maintainers)

npm login
npm publish --access public

Requires membership in the @agent-idx npm organization.

Set up in your AI client

AI clientOperating system

Merge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.

json

{
  "mcpServers": {
    "io-github-agent-idx-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@agent-idx/client"
      ]
    }
  }
}

Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.

Claude Desktop setup reference

Compatible MCP Clients

Agent Index works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.

Claude Desktop~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.

Cursor~/.cursor/mcp.jsonRestart Cursor for changes to take effect.

VS Code.vscode/mcp.jsonReload VS Code window for changes to take effect.

Windsurf~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect.

Claude Code.mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.

Agent Index