--- title: "Google Workspace APIs OAuth clients must be marked as agentic to call Google Workspace MCP servers: 2026-11-11 | Harbyn" description: "Google Workspace APIs OAuth clients must be marked as agentic to call Google Workspace MCP servers, effective Nov 11, 2026." canonical: "https://harbyn.com/changes/google-workspace/2026-10-12-oauth-clients-must-be-marked-as-agentic-to-call-google-workspace-mcp-servers" last-updated: 2026-10-15 --- # Google Workspace APIs OAuth clients must be marked as agentic to call Google Workspace MCP servers Markdown version of . Breaking change - Google Workspace APIs. high severity. Announced. Upcoming. Apps and integrations calling Google Workspace MCP servers will have requests rejected unless their OAuth client is marked as agentic by selecting “Use this client for an AI-powered agent.” Apps that only call Google Workspace REST APIs are not affected. If a client serves both agent and non-agent features, use a separate agentic client for the agent features. 17 days left: the deadline is Nov 11, 2026. ## Facts | Fact | Value | | --- | --- | | Vendor | [Google Workspace APIs](https://harbyn.com/vendors/google-workspace.md) | | Kind | Breaking change | | Severity | high | | Status | Announced | | Announced | Oct 12, 2026 | | Effective | Nov 11, 2026 | | Added to Harbyn | Oct 15, 2026 | | Lead time | 27 days of warning | | Review | Reviewed by a person, extracted by a model | ## Find it in your code ```sh npx harbyn scan ``` This change names no identifier the scanner can match line by line, so the scan tells you whether your repository uses Google Workspace APIs, from its packages and API hosts. Nothing leaves your machine. ## Sources Where this event comes from: the page we read, when we read it, and the hash of that snapshot. - (changelog, fetched 2026-10-15 04:48 UTC, sha256 `9433c9369df589c00aa84827e608e72a8e39fc336e511d73a8d2ca6a211be775`) ## Related changes ### Changes at other vendors - [Amazon Selling Partner API: October listing attribute usage and enumeration value updates](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-2.md) (effective Oct 26, 2026) - [Supabase: four CBC-mode TLS 1.2 cipher suites will be removed from project HTTP APIs](https://harbyn.com/changes/supabase/2026-10-12-an-outdated-subset-of-tls-1-2-ciphers-will-be-disabled-on-project-http-apis.md) (effective Nov 10, 2026) - [Bitbucket Cloud API: Git Credential Manager upgrade required for OAuth 2.0 Git authentication](https://harbyn.com/changes/bitbucket/2026-10-13-git-credential-manager-upgrade-required-for-oauth-2-0-git-authentication.md) (effective Nov 30, 2026) - [LinkedIn Marketing API: Publisher lists require a surface field](https://harbyn.com/changes/linkedin/2026-10-14-publisher-lists-require-a-surface-field.md) (effective Dec 15, 2026) [All upcoming deadlines](https://harbyn.com/deadlines.md)