Upstream cloud provider issue affecting Claude Code/Cowork web sessions; retry can resolve
Elevated errors on Claude Code and Claude Cowork affecting session stability
Original: Elevated errors on Claude Code and Claude Cowork
Importance: Web版ユーザーの実作業が直結で止まる障害のため、速報性が高く短期影響は大きい
Summary
Anthropic identified an upstream cloud provider issue affecting Claude Cowork and Claude Code on the web as of Aug 28. Some sessions fail to start or disconnect mid-task; affected sessions can be retried. The team is in contact with the provider and will update as soon as possible.
Key Points
- Claude Code/Cowork web sessions failing to start or disconnecting mid-task
- Upstream cloud provider issue identified; API layer unaffected
- Session retry available; provider restoration in progress
View developer notes (APIs, breaking changes, migration)
Upstream cloud provider outage affecting Claude Code and Claude Cowork web sessions. Session initialization failures and mid-task disconnects reported; root cause identified as provider-side infrastructure issue, not API layer. Mitigation: session retry on client side. Provider restoration in progress; no breaking changes to API contracts.
Source: https://status.claude.com/incidents/vr9tpk8w7zr8
Outlet: Anthropic Status
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