Failed to get OAuth token: state syncing error: key not found - Antigravity

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Error text / 报错原文

Failed to get OAuth token
state syncing error: key not found
Invalid Google Cloud Code Assist credentials

What it means

The local token store and the active Google session are out of sync. The IDE can show a signed-in state while background services cannot fetch credentials.

Most common causes

Machine sleep or account switch invalidated cached tokens
Multiple Google accounts share the same browser profile
Cloud Code Assist credentials are stale
Account lacks required project or API access

Fastest fix

Sign out, fully close the app, and sign in again
Clear only Antigravity auth token cache if normal sign-in loops
Use the same Google account in browser and IDE
Check whether required Google APIs are enabled

Safe fix

Use a dedicated work profile for agent IDEs
Avoid mixing personal and Workspace accounts in one session
Keep audit logs for organization accounts
Prefer service accounts for production MCP servers

What not to do

Do not store Google OAuth tokens in repo files
Do not switch accounts mid-agent run
Do not ignore repeated auth failures before destructive tasks

How to confirm the fix

Run the smallest reproducible command first, then retry the agent task only after authentication, quota, and tool discovery are stable.

echo $GOOGLE_APPLICATION_CREDENTIALS
gcloud auth list
gcloud config list account