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Uploads or creates a file.

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

Uploads or creates a file. [POST /files.upload]

Name on the gateway: slack_api__files_upload · may change things.

Parameters

Name	Type	Description
`token`	`string`	Authentication token. Requires scope: files:write:user
`file`	`string`	File contents via multipart/form-data. If omitting this parameter, you must…
`content`	`string`	File contents via a POST variable. If omitting this parameter, you must…
`filetype`	`string`	A file type identifier.
`filename`	`string`	Filename of file.
`title`	`string`	Title of file.
`initial_comment`	`string`	The message text introducing the file in specified channels.
`channels`	`string`	Comma-separated list of channel names or IDs where the file will be shared.
`thread_ts`	`number`	Provide another message's ts value to upload this file as a reply. Never use a…

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__files_upload",
  "arguments": {}
}

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 uploads or creates a file. tool with token set to ….