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Registers new participants added to a Call.

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

Registers new participants added to a Call. [POST /calls.participants.add]

Name on the gateway: slack_api__calls_participants_add · may change things.

Parameters

Name	Type	Description
`id` required	`string`	id returned by the calls.add method.
`users` required	`string`	The list of users to add as participants in the Call. Read more on how to…

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__calls_participants_add",
  "arguments": {
    "id": "…",
    "users": "…"
  }
}

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 registers new participants added to a call. tool with id set to ….