Claude.ai failing to connect to certain MCP servers

Incident Report for Anthropic

Resolved

This incident has been resolved.
Posted Aug 25, 2025 - 20:39 UTC

Monitoring

A fix has been implemented and we are monitoring the results.
Posted Aug 25, 2025 - 20:18 UTC

Identified

The issue has been identified and a fix is being implemented.
Posted Aug 25, 2025 - 20:14 UTC

Investigating

Claude.ai is failing to downgrade MCP connections to SSE for a limited number of MCP servers. We are currently investigating.
Posted Aug 25, 2025 - 19:02 UTC
This incident affected: claude.ai.
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