claude.ai Gmail/Calendar/Drive connectors not syncing to /mcp despite claudeAiMcpEverConnected showing them

Description

Previously connected claude.ai connectors (Gmail, Google Calendar, Google Drive) no longer appear in /mcp in Claude Code, despite being enabled at claude.ai/customize/connectors and previously working.

Environment

• Claude Code version: 2.1.131
• macOS Darwin 25.4.0
• Subscription: Max
• Auth: claude.ai (same account as web)
• Mode: interactive (not -p / --resume, so issue #36060 doesn't directly apply)

Diagnostics

• ~/.claude.json → claudeAiMcpEverConnected: ["claude.ai Google Calendar", "claude.ai Gmail", "claude.ai Google Drive"]
• ~/.claude.json → mcpServers: {} (empty)
• ENABLE_CLAUDEAI_MCP_SERVERS: unset (default behavior)
• Statsig flag tengu_claudeai_mcp_connectors: true
• ~/.claude/plugins/cache/: only contains claude-plugins-official — no claude.ai connector cache present to clear
• /mcp only shows plugin:github:github (which itself fails to connect, separate issue)

Reproduction / what I tried

1. Full Claude Code quit + restart → no connectors appear
2. Toggled all three connectors OFF then back ON at claude.ai/customize/connectors (forcing re-OAuth) → no connectors appear after subsequent restarts
3. Verified account match, subscription tier, env flags as above

Expected

Connectors listed in claudeAiMcpEverConnected and currently enabled at claude.ai should appear in /mcp and be usable in interactive mode.

Actual

None of the three sync. claudeAiMcpEverConnected retains the historical list but the live sync produces no mcpServers entries.

Notes

There appears to be no documented user-facing way to force a fresh sync, manually register the cloud-managed connectors via claude mcp add (no public URL/transport for them), or inspect why the sync silently no-ops.