slack-file-upload

Upload a file to Slack as the user, so it lands under their name in the same conversation as their own messages — never as a bot. Two bundled utilities do the work — slack-login (one-time, mints and stores a token) and slack-upload (the upload itself), both under this Skill's scripts/ directory. You orchestrate them. Run them with the Skill directory as your working directory, so the scripts/… paths below resolve.

The one decision: handle-only vs direct upload

• Direct upload — you have a target conversation (channel, DM, or group DM). Pass it and the file is posted there as the user in one step.
• Handle-only upload — you have no conversation (e.g. you'll embed the file in a canvas). Omit the conversation; you get back the file's { id, permalink } to place yourself via your own Slack MCP calls.

Both return { id, permalink } and need only the files:write scope.