LangChain incident

Agent-scoped sandbox fails to initialize on new agents

Resolved after 3 hours 42 minutes, affecting LangSmith Fleet, on September 2, 2026.

monitoring Sep 02, 2026, 08:32 PM UTC

The fix has been deployed. All systems are operational

Started
Sep 02, 2026, 05:04 PM UTC
Resolved
Sep 02, 2026, 08:47 PM UTC
Duration
3h 42m
Detected by Pingoru
Sep 02, 2026, 05:04 PM UTC

Affected components

LangSmith Fleet

Update timeline

  1. investigating Sep 02, 2026, 05:04 PM UTC

    This affects only newly created agents with a shared computer.

  2. 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.

  3. monitoring Sep 02, 2026, 08:32 PM UTC

    The fix has been deployed. All systems are operational

  4. resolved Sep 02, 2026, 08:47 PM UTC

    All systems are operational

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