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Slack Bot: require re-mention on every message in a thread, even after an initial tag #5741

Description

@emin93

Current behavior

Per the docs, the Slack Bot integration is session-per-mention: only the message that explicitly @mentions the bot is read, and each @bot thread is treated as its own isolated session. Follow-up messages in the same thread are ignored unless the bot is re-mentioned every time.

Problem

For a thread that's clearly an ongoing conversation with the agent (e.g. a back-and-forth in a single Slack thread), having to re-tag the bot on every single message is easy to forget and breaks the flow — a follow-up sent without the tag is silently never read.

Requested behavior

Once a thread has had at least one explicit @mention of the bot, let the bot keep reading (and optionally responding to) subsequent messages in that same thread without requiring a re-mention on every message — at least as an opt-in behavior, since always-on listening may not be desired in every channel.

Context

Multica's own in-app Chat feature already works this way (every message in an active conversation triggers a response, no mention needed) — this request is about bringing equivalent continuity to Slack threads specifically.

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