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Michael Suchacz
3dd9265fa6
Closes [CODAGT-804](https://linear.app/codercom/issue/CODAGT-804/add-ui-option-to-revoke-oauth-mcp-credentials). Users could authenticate with an OAuth2 MCP server from the chat input, but there was no UI to disconnect those per-user credentials. The backend endpoint (`DELETE /api/experimental/mcp/servers/{id}/oauth2/disconnect`) already existed. ## Changes - Connected OAuth2 MCP rows in the chat input plus menu now show a disconnect icon button next to the enable switch. It opens a confirmation dialog; confirming calls the disconnect endpoint, shows a toast, and refetches MCP configs so the row reverts to the `Auth` button without a reload. - New `disconnectMCPServerOAuth2` API client method and react-query mutation that invalidates `mcp-server-configs`. - Storybook interaction tests: control visibility per auth state, cancel makes no API call, confirm calls the endpoint once, failed disconnect keeps the dialog open. - Hardened `TestMCPServerConfigsOAuth2Disconnect`: seeded tokens flip `auth_connected`, disconnect only removes the calling user's token, and repeat disconnect stays idempotent. The endpoint removes the token stored in Coder; it does not revoke the upstream OAuth grant, so the UI copy says "disconnect" rather than "revoke". Validated with the targeted Go test, Storybook tests (51 passed), tsc, biome, the react-compiler check, and a manual dogfood run (seeded token, disconnect/cancel/reconnect flows verified in the UI). > This PR was authored by Mux, an AI coding agent, on Mike's behalf.