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

# Integration platform

> Official external APIs used for sources, operator access, calendars, signals, and publishing.

## How Harmonia uses it

YouTube supplies authorized source metadata and media context. Hacker News Algolia supplies public trend signals. Telegram offers an allow-listed operator surface. Google Calendar synchronization is explicit, and X publishing uses the official API behind digest-bound approval and idempotent execution.

<CardGroup cols={2}>
  <Card title="X API" href="/platform/integrations/x-api">Approval-gated publishing and read-back.</Card>
  <Card title="Telegram" href="/platform/integrations/telegram">Allow-listed operator commands.</Card>
  <Card title="Google Calendar" href="/platform/integrations/google-calendar-api">Explicit calendar synchronization.</Card>
  <Card title="YouTube" href="/platform/integrations/youtube">Authorized source ingestion.</Card>
</CardGroup>

## Evidence status

Integration code and tests do not prove credentials, quota, or provider acceptance. Each provider page separates implemented behavior from authenticated evidence.