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Add an Enterprise user to a workspace.

An MCP tool from the Slack API server, hosted on mcp.hjlabs.in.

Add an Enterprise user to a workspace. [POST /admin.users.assign]

Name on the gateway: slack_api__admin_users_assign · may change things.

Parameters

Name	Type	Description
`team_id` required	`string`	The ID (T1234) of the workspace.
`user_id` required	`string`	The ID of the user to add to the workspace.
`is_restricted`	`boolean`	True if user should be added to the workspace as a guest.
`is_ultra_restricted`	`boolean`	True if user should be added to the workspace as a single-channel guest.
`channel_ids`	`string`	Comma separated values of channel IDs to add user in the new workspace.

Through the Smart Gateway, any client can run it by name with call_tool, or let the gateway find it with search_tools:

call_tool arguments

{
  "name": "slack_api__admin_users_assign",
  "arguments": {
    "team_id": "…",
    "user_id": "…"
  }
}

Or connect the Slack API server directly, which lists 174 tools including this one:

Run in your terminal

claude mcp add --transport http hj-slack-api https://mcp.hjlabs.in/mcp/slack-api \
  --header "Authorization: Bearer YOUR_API_KEY"

Use the add an enterprise user to a workspace. tool with team_id set to ….