Direct answer: Slackbot can use an installed app’s MCP tools after the member connects their account. Free and Pro include only a trial or preview; Business+ includes 15 Slackbot messages per member each week; Enterprise+ has no weekly or lifetime message cap. Enterprise Select or Enterprise Grid also has no weekly or lifetime cap when the Slack AI add-on is present. Eligible Free, Pro, and Business+ workspaces can enable Salesforce Flex Credits after their included allowance, but the dollar cost depends on the Salesforce contract and the actions Slackbot performs.
The key distinction is between a Slackbot message allowance and an MCP tool action. Slack counts a member’s messages toward the plan allowance. If Flex Credits are enabled, usage is billed by Slackbot actions; an MCP request is not automatically the same thing as one message or one billable action.
Slackbot MCP access by plan
| Slack plan | Standard U.S. list price | Slackbot allowance | MCP server and tool controls |
|---|---|---|---|
| Free | $0 | Trial or preview; the included preview messages do not reset. Eligible workspaces can enable Flex Credits for usage after the preview. | Slack’s guide documents normal app-approval controls; check your workspace settings for MCP-specific options. |
| Pro | $7.25 per active user/month with annual billing; $8.75 with monthly billing | Trial or preview; the included preview messages do not reset. Eligible workspaces can enable Flex Credits after the preview. | No granular MCP server or tool controls. |
| Business+ | $15 per active user/month with annual billing; $18 with monthly billing | 15 messages per member each week, resetting at 00:00 Monday in the member’s time zone. Eligible workspaces can enable Flex Credits after the allowance. | No granular MCP server or tool controls. |
| Enterprise+ | Sales quote | No weekly or lifetime message cap, subject to Slack’s overall usage policies. | Org admins can manage MCP servers, tool types, and individual tools. |
| Enterprise Select or Enterprise Grid with Slack AI add-on | Contract-dependent | No weekly or lifetime message cap. | Enterprise Grid admins can manage MCP servers and tools; this control is unavailable on Enterprise Select. |
Slack’s current Slackbot limits guide defines the per-member message limits and Flex Credit eligibility. Its MCP setup guide says detailed MCP permissions are available to Enterprise Grid and Enterprise+ admins, but not to Pro, Business+, or Enterprise Select admins. This MCP-specific permission setting is separate from ordinary app approval: workspace owners and admins may still control who can install or use an app.
The public price rows use U.S. list rates before tax, promotion, discounts, or contract terms. Slack’s pricing page may display local currency and offers based on the visitor’s region. Enterprise+ and older Enterprise plans are contract-priced.
How an app connects to Slackbot
The usual setup is:
- A member or admin installs the Slack app that provides the MCP server. Workspace or Enterprise app-approval settings may require an admin to install it.
- Each member connects their own account for that app. Slackbot then uses the tools the app exposes under that member’s connected account and access rights.
- The member asks Slackbot to do the task in natural language. Slackbot chooses the app tools it needs, and the connected service applies its own permissions and limits.
Slack’s MCP guide notes that if an already-installed app later adds an MCP server, the workspace must install the updated app and members must reconnect their accounts. For app-specific setup and limits, see the Miro integration and MCP guide; Miro’s daily tool-call quota is separate from Slackbot’s message allowance.
What Flex Credits charge for
Flex Credits are an optional way to continue eligible Slackbot use after a plan’s included message allowance. To enable them, the Slack workspace must connect to a Salesforce organization that has Flex Credits, and both a Slack workspace owner or admin and a Salesforce admin must enable Slackbot usage. Slack says the usage is charged according to the organization’s rate card and contract.
When Flex Credit billing applies, Salesforce documents the unit more precisely in its Slackbot action-billing guide:
| Billable unit | What it means | Current rate-card multiplier |
|---|---|---|
| Standard Action | Eligible user-visible MCP tool calls are Standard Actions, except Salesforce MCP calls. Internal or system work (including tool discovery and MCP routing) and accessory calls are not billed separately. | 40 Flex Credits |
| Advanced Action | Premium work such as deep research, reports, or creating/editing some third-party documents and slides. It can be charged in addition to a Standard Action in the same turn. | 200 Flex Credits |
The Flex Credits rate card dated August 31, 2026 lists these Slackbot multipliers per Slack workspace. A Flex Credit does not have one public dollar price: the contract determines what the organization pays per credit, so there is no reliable universal USD price for an MCP request.
A user-visible Slackbot reply is a turn for billing. Salesforce says each unique tool is billed once per turn, multiple calls toward the same outcome may be grouped, tool-call errors are not billed, and every metered turn includes at least one Standard Action. One message can produce multiple actions; conversely, several underlying calls that support one outcome can be grouped. For a budget, combine related requests when that remains safe, then check the organization’s Digital Wallet and contract rather than treating “one message” as a fixed dollar amount.
Slack also says advanced Slackbot capabilities released after June 2026, such as third-party content creation and automated actions, may move to alternative models with usage limits, consumption pricing, or a hybrid approach. Slack says it will give 30 days’ written notice before usage-based pricing takes effect. Recheck Slack’s current limit and credit guidance before procurement; the packaging may change.
Example: upgrading 25 people from Pro to Business+
A Pro-to-Business+ upgrade buys the whole Slack plan, not a standalone Slackbot seat. Using the U.S. annual list rates above, a 25-active-user workspace would add:
| Billing basis | Calculation | Added Slack subscription cost |
|---|---|---|
| Annual billing, shown as a monthly equivalent | 25 × ($15 − $7.25) | $193.75/month, or $2,325/year |
| Monthly billing | 25 × ($18 − $8.75) | $231.25/month |
This estimate excludes tax, promotions, custom contract terms, Flex Credits, and each connected app’s own plan. Business+ also includes Slack features beyond Slackbot. Its 15 messages are individual member allowances, not a shared workspace pool: a 25-member workspace can use up to 375 included messages in a week only if all 25 members use their full allowance.
Flex Credits may suit a team that needs occasional extra Slackbot use, but their dollar cost is contract-specific. Enterprise+ removes the weekly/lifetime message cap and adds granular MCP controls, but Slack does not publish a standard Enterprise+ price. Compare the expected Slackbot volume, tool permissions, and other Business+/Enterprise features before treating either as a simple upgrade for MCP alone.
When a direct Slack app is enough
Slackbot is useful when a request needs Slackbot’s cross-app context or actions. For routine diagram creation and revision, a diagram app’s own Slack command can avoid spending Slackbot messages.
Arialine has both routes: its MCP server for Slack AI lets Slackbot request diagram work, while /arialine, addressed thread edits, and shortcuts work on every Slack plan. Pasting valid Mermaid renders without AI; a natural-language edit uses Arialine’s AI allowance. The current Arialine pricing page lists Free with 3 boards, up to 8 versions per board, and 10 AI generations per workspace per day; Team is $79/month or $756/year per workspace, plus applicable tax. The direct command workflow does not consume Slackbot’s message allowance.
That is a narrower product comparison, not a like-for-like replacement for Slackbot: Arialine maintains Mermaid diagrams from Slack, while Slackbot can act across multiple connected apps. If the team mainly needs diagrams, start with the direct workflow and compare its workspace limits with the Slackbot features the team would actually use.
Questions teams ask before enabling Slackbot MCP
Does one Slackbot message equal one MCP call?
No. The plan limit counts a member’s messages to Slackbot. One message can lead to multiple tool calls. When Flex Credits apply, Salesforce groups usage into billable actions; a user-visible turn can include a Standard Action and an Advanced Action, and multiple calls toward the same outcome can be grouped.
Can Free or Pro members use Slackbot after the preview?
They can if the workspace connects an eligible Salesforce organization and Slackbot Flex Credits are enabled by both the required Slack and Salesforce admins. Otherwise, the preview does not reset; upgrading to Business+ or Enterprise+ is another option. An app’s own Slack command may still work separately from Slackbot, depending on that app’s plan requirements.
Are Miro or Arialine MCP limits part of the Slackbot allowance?
No. Slackbot messages, Slackbot Flex Credit actions, and connected apps’ own quotas are separate counters. For Miro’s current setup and MCP call limits, see the Slack and Miro integration guide.
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