Resolved after 1 hour 33 minutes, affecting Slack and Sidekick and 1 more, on October 28, 2026.
This incident is resolved. Between 9:51am and 10:20am PT, AI features in Plain (including Ari, Sidekick, AI workflows and thread fields) were unavailable or delayed, and some incoming Slack messages were delayed. This was caused by an issue with one of our third-party AI providers, which has been fixed. Any actions delayed during this window have been or are being processed automatically, with no action needed on your side. Sorry for the disruption.
Affected components
Update timeline
- identified Oct 28, 2026, 05:20 PM UTC
We’re seeing failures across AI-powered features in Plain, including AI agents, AI-powered workflows, thread triage and thread fields. We’ve identified the cause and are working on a fix. Sending and receiving messages is not affected. We’ll share another update within 30 minutes, or sooner once this is resolved.
- monitoring Oct 28, 2026, 05:23 PM UTC
A fix has been applied and AI features are recovering. We’re monitoring closely and will share another update once we’ve confirmed everything is back to normal.
- monitoring Oct 28, 2026, 05:43 PM UTC
AI features are working normally again. We’re now processing actions that were delayed during the incident, so you may see some AI replies, workflow actions or thread field updates arrive later than usual. Nothing has been lost. We’ll confirm once everything has fully caught up.
- resolved Oct 28, 2026, 06:54 PM UTC
This incident is resolved. Between 9:51am and 10:20am PT, AI features in Plain (including Ari, Sidekick, AI workflows and thread fields) were unavailable or delayed, and some incoming Slack messages were delayed. This was caused by an issue with one of our third-party AI providers, which has been fixed. Any actions delayed during this window have been or are being processed automatically, with no action needed on your side. Sorry for the disruption.
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