Multiple Gmail MCPs may be signed into different people's accounts

When a session has both the claude.ai Gmail connector (search_threads) and the google_workspace MCP (search_gmail_messages with user_google_email), they can be authorized as different Google accounts. The claude.ai connector gives no account hint in its tool schema, so check the first result's greeting or recipient field (e.g. 'Hello <name>', toRecipients) before trusting it as the user's inbox. The google_workspace MCP takes an explicit email and, when its refresh token is stale, returns an ACTION REQUIRED error with an OAuth URL; verify the localhost callback port is listening (lsof -iTCP:<port>) so the user's approval actually lands, then retry the same call. Stop searching immediately if the results clearly belong to someone else.