When does Google Workspace begin enforcing the MCP OAuth client marker?
Google's release notes say Workspace MCP servers will reject OAuth clients without the agent-use marker beginning November 11, 2026. The separate MCP service remains in Developer Preview.
Answered in
Google Workspace MCP Clients Face a November Agent-Use GateGoogle will require an agent-use OAuth client marker for Workspace MCP beginning November 11. Ordinary Workspace REST API integrations are unaffected.
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