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Glean uses the Slack Real Time Search (RTS) API as the primary, Slack‑approved method to access messages at query time.
Slack is phasing out older API patterns that underpin legacy indexing‑only Slack connectors. Slack has announced that it will begin rate‑limiting these legacy connectors after March 3, 2026.

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Architecture and connection

How Glean connects to Slack

Two-connector model, RTS and Slack connector, and query flow

Architecture overview

Data flow between Slack and Glean when RTS is enabled

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Upcoming changes

Slack connector changes

What connectors to setup and how to migrate existing custom instances

Gleanbot impacts and FAQ

How the Slack connector migration affects Gleanbot and answers to common questions