Can Slackbot edit your diagrams? Slackbot MCP plans, limits and costs
Slackbot can now call MCP apps such as Miro, Figma or Arialine. Here is which Slack plans include it, the message limits, and what to do if your workspace is on Free or Pro.
Direct answer: Slackbot can use MCP apps (Miro, Figma, Linear, Arialine and others) to read and change content for you, but only where Slackbot is available: it is included on Slack Business+ with a limit of 15 Slackbot messages per member per week, and on Enterprise+ without weekly limits. On Free and Pro, Slackbot is available only during a trial or preview, and those preview messages don't reset. Apps that work through their own commands, mentions and shortcuts — like Arialine — work on every plan.
Slackbot by Slack plan
| Slack plan | Slackbot | Message limit | Admin control over MCP tools |
|---|---|---|---|
| Free | Trial or preview only | Preview allowance, does not reset | No |
| Pro | Trial or preview only | Preview allowance, does not reset | No |
| Business+ | Included | 15 messages per member per week (resets Monday) | No |
| Enterprise+ / Enterprise Grid | Included | No weekly or lifetime limit | Yes: servers, tool types, individual tools |
Usage beyond the plan limit can be paid with Flex Credits. Slack has also said advanced Slackbot capabilities released after June 2026 may move to usage-based pricing, with 30 days' notice.
How MCP apps connect
- Someone who can install apps installs an app that includes an MCP server (for example Miro).
- Each member connects their own account for that app. From then on Slackbot can use all of that app's tools for them.
- The member asks Slackbot in natural language; Slackbot picks the tools.
On Pro and Business+, admins cannot restrict which MCP servers or tools are used; that control is only on Enterprise Grid and Enterprise+.
What 15 messages a week means in practice
Creating a diagram and then refining it usually takes several turns: "make a flowchart from this thread", "add the retry path", "rename the worker", "move billing to the right". At 15 messages a week, one person can do a few such sessions before the allowance runs out.
Diagramming in Slack without Business+
Arialine is a Slack app, not a Slackbot feature, so it works on every plan:
/arialine→ paste Mermaid (rendered without AI) or describe the diagram.- Reply in the diagram thread:
@arialine add a cache in front of the database→ version 2. - Free plan: every feature, 3 boards, 10 AI generations per workspace per day. Team: $50 a month per workspace, unlimited.
If your workspace does have Slackbot, Arialine also works as an MCP app, so you can ask Slackbot to create or explain Arialine diagrams too. See how Arialine works with Slack AI.
Sources (reviewed September 24, 2026)
Try it in context
Bring Arialine into your Slack
Diagram from any Slack plan: type /arialine and paste Mermaid or describe the diagram.
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