Elevated errors on tool use for Claude Code on Opus 4

Incident Report for Anthropic

Resolved

This incident has been resolved.

Posted May 22, 2025 - 15:32 PDT

Monitoring

A fix has been implemented, and the issue should be resolved upon updating Claude Code. We are continuing to monitor closely to ensure there are no further issues.

Posted May 22, 2025 - 14:57 PDT

Investigating

We have identified an issue related to tool usage in Claude Code on Claude Opus 4, and our engineers are working to resolve this issue. We will provide additional updates as soon as possible.

Posted May 22, 2025 - 14:37 PDT

This incident affected: Claude Code.