Proposal: integrate Slack's native drafts API

[kavin-kr]

Slack has an undocumented client API for managing drafts. It supports:

• list drafts
• create draft
• update draft
• delete draft

Reference:
https://github.com/karbassi/slack-mcp/blob/1c0f8cc503e5f1ebb7f43eb649eb4e07bd76eda0/src/slack_mcp/tools/undocumented.py#L112-L233

Adding this would let agents read and write drafts that show up natively in the user's Slack client, instead of only posting messages directly.

Problem

agent-slack message draft <target> [text] already exists, but it opens a browser editor for human-in-the-loop composing and is not connected to Slack's own drafts.

Adding Slack-native draft operations under the same draft name will likely confuse the LLM.

Options

1. Separate plural subcommand: add message drafts list / create / update / delete, keep the existing singular message draft as-is.

2. Rename and reuse draft: rename message draft to message compose (matches what it does), then use message draft <list | create | update | delete> for the Slack-native operations.

3. Replace: drop the browser editor and repurpose message draft for the Slack-native operations.

Wanted to align on direction with the team before opening any PRs. Open to other options too.

[AmethystLiang]

sounds good! will add it this week

[kavin-kr]

Thanks !