> ## Documentation Index
> Fetch the complete documentation index at: https://a-identity.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# MCP

> The Model Context Protocol. How agents reach your tools.

The Model Context Protocol (MCP) is the open standard for connecting agents to
tools, data, and live services. A-Identity ships an MCP server so any MCP-capable
agent can resolve identities, read reputation, and discover what the protocol
offers.

## The A-Identity Server

<CardGroup cols={3}>
  <Card title="resolve_agent" icon="fingerprint">
    Look up an ERC-8004 identity by id, token, owner, or domain.
  </Card>

  <Card title="get_reputation" icon="star">
    Compute a deterministic reputation score for an agent.
  </Card>

  <Card title="list_capabilities" icon="list">
    Describe the protocol surface: identity, payments, connectivity, reputation.
  </Card>
</CardGroup>

The server speaks MCP over stdio and over Streamable HTTP. Today it is read only,
so there are no keys and no funds involved.

## Connect It

```bash Claude Code theme={null}
claude mcp add a-identity -- node ./mcp/dist/index.js
```

```json Any MCP client theme={null}
{
  "mcpServers": {
    "a-identity": {
      "command": "node",
      "args": ["./mcp/dist/index.js"]
    }
  }
}
```

## Paid Tools Over MCP

With `x402-mcp`, a tool can require payment before it runs. The agent pays in the
same call. See [x402](/protocols/x402) for the payment side and the
[MCP server reference](/developers/mcp-server) for every tool.