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commands/auth-check.md

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+---
+description: Verify OAuth credentials and API access
+argument-hint:
+---
+
+Verify Google OAuth credentials and API access.
+
+## Usage
+
+```bash
+google-gmail-tool auth check [-v|-vv|-vvv]
+```
+
+## Environment Variables
+
+- `GOOGLE_GMAIL_TOOL_CREDENTIALS_JSON`: Full OAuth2 credentials as JSON
+- `GOOGLE_GMAIL_TOOL_CREDENTIALS`: Path to credentials JSON file
+
+## Examples
+
+```bash
+# Check authentication status
+google-gmail-tool auth check
+
+# Check with verbose output
+google-gmail-tool auth check -vv
+```
+
+## Output
+
+Returns status for Gmail, Calendar, Tasks, and Drive API access.