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

> ## Agent Instructions
> PostQueen's hosted API is https://api.postqueen.ai. The public API base is https://api.postqueen.ai/public/v1 and takes the raw API key in the Authorization header, with no Bearer prefix.
> The MCP server for posting is https://api.postqueen.ai/mcp/YOUR_API_KEY (or /mcp with Authorization: Bearer YOUR_API_KEY). docs.postqueen.ai/mcp only searches these docs and cannot post.
> The API key is under Connections > API Keys in the app, and only workspace admins can see it.

# Slack

> What PostQueen will post to public and private Slack channels, and the limits it checks before a post is scheduled.

export const ChannelStatus = ({status, children}) => {
  const look = ({
    available: {
      color: 'green',
      label: 'Available'
    },
    'in-review': {
      color: 'yellow',
      label: 'In review'
    },
    soon: {
      color: 'gray',
      label: 'Soon'
    }
  })[status] || ({
    color: 'gray',
    label: status
  });
  return <div className="pq-status not-prose" data-status={status}>
      <Badge color={look.color} shape="pill" size="md">{look.label}</Badge>
      {children ? <span className="pq-status-note">{children}</span> : null}
    </div>;
};

<ChannelStatus status="soon">Cannot be connected on PostQueen yet.</ChannelStatus>

PostQueen will post messages and images to your public and private Slack channels, under the name and picture you choose for the channel, with follow-ups as thread replies.

<div className="pq-visual pq-visual-card pq-tint-lilac">
  <img noZoom src="https://mintcdn.com/forceplay/CEQwaAjYodG7Gh_r/images/site/channels/slack.webp?fit=max&auto=format&n=CEQwaAjYodG7Gh_r&q=85&s=339a8a45db573b799a774d7e9b8bf9ce" alt="A new Slack post in the PostQueen composer, with the post types Slack takes and the time it goes out" width="1200" height="1078" data-path="images/site/channels/slack.webp" />
</div>

## What you can post

<CardGroup cols={2}>
  <Card title="Text" icon="type">
    Up to 150,000 characters, sent as Slack mrkdwn. Long text is split into sections of up to 3,000 characters at line breaks.
  </Card>

  <Card title="Media" icon="image">
    PNG, JPG or GIF images, shown under the text. No video.
  </Card>

  <Card title="Post types" icon="layers">
    A channel message, with follow-ups as replies in its thread.
  </Card>

  <Card title="Analytics" icon="chart-line">
    No analytics for Slack.
  </Card>
</CardGroup>

**Not supported:** video, file uploads, and more than one channel of the same workspace in one post.

## Connect Slack

<Note>
  Slack is listed in **Add Channel**, but it cannot be connected on PostQueen yet. Connecting it will install PostQueen's Slack app in your workspace, so you will need permission to install apps there.
</Note>

## Post settings

Each Slack post in the composer has one setting:

* **Select Channel**: the public or private channel to post in. Required. You pick it in each post, not when you connect.

The field names and values for the API are on [Slack posting settings](/public-api/providers/slack).

## Good to know

* Before a post is scheduled, PostQueen checks that it has no video, that a channel is picked, and that each message fits in Slack's 50 blocks: each picture is one block, and the text takes one per 3,000 characters.
* **Add comment** adds follow-ups, each with its own delay. They go out as replies in the message's thread, and each can carry images.
* Posts show the name and picture set for the channel in PostQueen. Change them with **Bot name & avatar** on the **Channels** page.
* PostQueen joins a public channel by itself before posting. Invite the app to a private channel first, or the post fails.
* If Slack refuses a message, the post fails with Slack's reason, such as `not_in_channel`, instead of being marked published.
* Each published post links to the message in Slack.

## Next steps

<CardGroup cols={2}>
  <Card title="Create a post" icon="square-pen" href="/using/create-a-post">
    Write once for several channels, then schedule it, save a draft or post now.
  </Card>

  <Card title="Channels and their status" icon="layout-grid" href="/channels/overview">
    Which networks you can connect today, what each one posts, and its text limit.
  </Card>

  <Card title="Post from an AI agent" icon="bot" href="/agents/overview">
    Ask Claude, ChatGPT, Grok Bot or another agent to schedule the post for you.
  </Card>

  <Card title="A post did not go out" icon="triangle-alert" href="/troubleshooting/post-failed">
    Why a post fails and what to do about it.
  </Card>
</CardGroup>