slack-outgoing-message

name	slack-outgoing-message
description	Compose and send a Slack message to a channel, thread, or DM (or draft one for approval). Use when the user asks to post/send/DM something on Slack, or to reply in a specific thread.
emoji	✉️

Slack outgoing message

Write the message in the user's voice and put it in the right place — safely.

Steps

1. Resolve the destination. Turn a channel/person name into an ID with the channel-list / user-search tools; don't guess IDs. For a threaded reply, get the parent ts. For a DM fan-out, confirm recipients and prefer a group DM.
2. Resolve relative targets with a fresh read. "reply to the last message", "in that thread" → read the destination now to get the correct ts/context before composing.
3. Compose in Slack mrkdwn, matching the channel's tone. Keep it tight; don't over-format. Use <@U…>/<#C…> for real mentions only.
4. Send vs draft:
   • Explicit "post"/"send"/"DM them" → send directly.
   • Otherwise (or per the user's message-consent settings) → present the draft and wait for approval; refine on feedback before sending.
   • Always call out high-impact sends before doing them: @channel/@here, customer/external-facing posts, or DMs to many people.
5. Send with the send-message tool (thread_ts for a reply). Confirm what you posted and where (channel + link/ts). On a 429, back off in the send bucket.
6. If the message fulfills or creates a commitment, update todo_add/todo_complete (source: "slack", sourceRef = the ts).

Never fabricate facts, approvals, or decisions in a message. If you're missing something needed to write it well, ask the user rather than guess.