LangChain incident
Agent-scoped sandbox fails to initialize on new agents
Resolved after 3 hours 42 minutes, affecting LangSmith Fleet, on September 2, 2026.
The fix has been deployed. All systems are operational
Affected components
Update timeline
- investigating Sep 02, 2026, 05:04 PM UTC
This affects only newly created agents with a shared computer.
- identified Sep 02, 2026, 05:59 PM UTC
We have identified the root cause of this incident and are actively working on a fix. The issue originates from a recent change to how sandbox slugs are generated in our backend systems, which now derive slugs directly rather than referencing sandbox IDs. This has introduced a mismatch between the values returned by the backend and those the frontend expects. We will share a further update as remediation progresses.
- monitoring Sep 02, 2026, 08:32 PM UTC
The fix has been deployed. All systems are operational
- resolved Sep 02, 2026, 08:47 PM UTC
All systems are operational
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