> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stackone.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Protocols & SDKs

> The ways to call a connector's actions. The guides live under Call Actions.

Every protocol exposes the same actions and uses the same two values: your API key and the account's `x-account-id`. The full guides live under [Call Actions](/embed/call-actions/overview):

<CardGroup cols={2}>
  <Card title="Agent SDK" icon="code" href="/embed/call-actions/agent-sdk">
    Typed TypeScript and Python tools for your agent framework. Fetch, filter, and execute.
  </Card>

  <Card title="MCP" icon="plug" href="/embed/call-actions/mcp">
    Call the MCP server from your own product or agent framework with an API key and account ID.
  </Card>

  <Card title="Agent2Agent" icon="robot" href="/embed/call-actions/agent2agent">
    Call a pre-built agent per integration, for multi-agent orchestration.
  </Card>

  <Card title="RPC/HTTP" icon="terminal" href="/embed/call-actions/rpc-http">
    Call an action from any backend or script with no agent or framework.
  </Card>
</CardGroup>

To connect ChatGPT, Claude, Cursor, or another AI platform without writing code, use the StackOne MCP server through [AI Platforms](/connect/ai-platforms/overview) instead. Each user signs in with OAuth, so no API key is involved.


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