# Claude: MCP tool calling issues for Advanced Research queries in Claude.ai

- Impact (vendor’s label): major
- Status: resolved
- Started: 2025-05-21 18:29 UTC · Resolved: 2025-05-21 20:38 UTC · Duration: 2.1 h
- Updates: 1
- [Vendor status page: https://status.claude.com/incidents/5mjbw9649jrd](https://status.claude.com/incidents/5mjbw9649jrd)
- [Company: Claude](https://rewindex.com/company/claude.md)

## Timeline of updates

- **resolved** 2025-05-21 20:38 UTC: This incident has been resolved.

_From the vendor’s published history: only the final update text is available for incidents before Rewindex began polling this page._


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Canonical: https://rewindex.com/company/claude/incidents/5mjbw9649jrd · Markdown: https://rewindex.com/company/claude/incidents/5mjbw9649jrd.md · JSON: https://rewindex.com/api/v1/companies/claude/incidents/5mjbw9649jrd · Generated 2026-10-18T10:39:05.987Z