LangChain incident
Agent-scoped sandbox fails to initialize on new agents
LangChain experienced a minor incident on September 2, 2026 affecting LangSmith Fleet, lasting —. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Sep 02, 2026, 05:04 PM UTC
Status: Investigating This affects only newly created agents with a shared computer. Affected components LangSmith Fleet (Partial outage)
- identified Sep 02, 2026, 05:59 PM UTC
Status: Identified 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. Affected components LangSmith Fleet (Partial outage)
- monitoring Sep 02, 2026, 08:32 PM UTC
Status: Monitoring The fix has been deployed. All systems are operational Affected components LangSmith Fleet (Operational)
- resolved Sep 02, 2026, 08:47 PM UTC
Status: Resolved All systems are operational Affected components LangSmith Fleet (Operational)