> ## 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">
    Add tools to any MCP client — config only, no code.
  </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 — no agent or framework.
  </Card>
</CardGroup>