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

# Compose & schedule

> Write captions, attach media from Studio or campaigns, and schedule posts to any connected social account — or automate publishing via the Elaris MCP.

You can compose and schedule posts directly from the Elaris UI or programmatically via the MCP API. Both paths converge on the same scheduler queue.

## How do I create and schedule a post?

<Tabs>
  <Tab title="From the UI">
    <Steps>
      <Step title="Start a new post">
        Go to **Scheduler → Calendar** or **Posts** and click **New Post** (or tap a time slot on the calendar).
      </Step>

      <Step title="Attach media">
        Pull assets from:

        * **Studio projects** — use finals or exports directly from the editor
        * **Campaign assets** — any video, image, or audio tied to an active campaign
        * **Direct uploads** — drag-and-drop from your local device
      </Step>

      <Step title="Write or generate a caption">
        Type your caption or use the **Generate caption** tool to produce platform-optimized copy from your media. Studio and MCP caption tools also produce captions you can paste here.
      </Step>

      <Step title="Choose destination accounts">
        Select one or more connected accounts to publish to. You can target multiple platforms in a single scheduling action.
      </Step>

      <Step title="Set the publish time">
        Pick a specific date and time, or use **Schedule for later** to save it to Drafts first. The scheduler tick processes due posts automatically — no manual trigger needed.
      </Step>

      <Step title="Confirm">
        Click **Schedule**. The post moves to your calendar and the Posts queue.
      </Step>
    </Steps>
  </Tab>

  <Tab title="Via MCP">
    Use the Elaris MCP tools to schedule posts programmatically from any agent, script, or CI pipeline.

    <Steps>
      <Step title="List available integrations">
        Call `list_scheduler_integrations` to retrieve the IDs and metadata for all connected social accounts in the current workspace.
      </Step>

      <Step title="Schedule the post">
        Call `schedule_post` with the target integration ID, media asset reference, caption, and publish timestamp.
      </Step>
    </Steps>

    <Tip>
      Use `generate_caption` via MCP to produce captions before calling `schedule_post` — this keeps the full creation flow inside a single agent run.
    </Tip>
  </Tab>
</Tabs>

## What media formats are supported?

<AccordionGroup>
  <Accordion title="Images">
    JPEG and PNG are accepted across all image-supporting platforms. Recommended resolution is at least **1080 × 1080 px** for square, or **1080 × 1920 px** for vertical Stories/Reels.
  </Accordion>

  <Accordion title="Videos">
    MP4 (H.264) is the universal format. Platform-specific limits apply — Instagram Reels cap at 90 seconds, YouTube has no hard cap for channel uploads.
  </Accordion>

  <Accordion title="Audio">
    Audio-only posts are not directly supported for scheduling. Attach audio as part of a video asset via Studio before scheduling.
  </Accordion>
</AccordionGroup>

## Can I publish to multiple platforms at once?

Yes. When composing, select all the destination accounts you want to target. Elaris sends the post to each platform independently, so per-platform failures don't block others. Check **Scheduler → Posts** to see the per-platform publish status.

<Note>
  Caption copy and hashtag limits vary by platform. If you're publishing to several at once, review each platform's character limit before scheduling.
</Note>

## Next steps

<CardGroup cols={2}>
  <Card title="Calendar & drafts" icon="calendar" href="/docs/scheduler/calendar-and-drafts">
    Reschedule, edit drafts, and recover failures
  </Card>

  <Card title="Scheduler analytics" icon="chart-bar" href="/docs/scheduler/analytics">
    Track post-level performance after publishing
  </Card>
</CardGroup>