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claude-code - 💡(How to fix) Fix [BUG] Google Drive MCP connector — create_file with explicit parentId fails "User cannot add children to specified folder" — regression after May 7 incident

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Error Message

Writing with no parentId (defaults to Drive root / My Drive root) succeeds. Writing with any explicit folder parentId — including freshly created test folders — fails with the same error. Revoking OAuth at myaccount.google.com/permissions and reconnecting the connector did not fix it.

Error Messages/Logs

    1. Observe error: "User cannot add children to the specified folder"
    1. Repeat step 2 with a brand new folder created seconds earlier — same error
            • Error message: "User cannot add children to the specified folder"
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

The Google Drive connector's create_file tool returns "User cannot add children to the specified folder" when any explicit parentId is specified. This was working correctly before May 7, 2026 and has since regressed.

Writing with no parentId (defaults to Drive root / My Drive root) succeeds. Writing with any explicit folder parentId — including freshly created test folders — fails with the same error. Revoking OAuth at myaccount.google.com/permissions and reconnecting the connector did not fix it.

What Should Happen?

Files created with an explicit parentId should land in the specified folder, as they did prior to May 7, 2026.

Error Messages/Logs

Steps to Reproduce

  1. Connect Google Drive connector in claude.ai Settings → Connections
    1. In a claude.ai chat, ask Claude to create a file in a specific folder (any folder in My Drive)
    1. Observe error: "User cannot add children to the specified folder"
    1. Ask Claude to create a file with no parentId specified — this succeeds and lands in Drive root
    1. Repeat step 2 with a brand new folder created seconds earlier — same error

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

N/A — this is the claude.ai web connector (not Claude Code CLI)

Claude Code Version

N/A — this is the claude.ai web connector (not Claude Code CLI)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

  • Connector: Google Drive (claude.ai Settings → Connections)
    • Was working: confirmed 14 clean writes to specific parentIds on May 7, 2026 before the incident
      • Stopped working: during/after the May 7 platform outage (15+ hours down per StatusGator)
        • Write to root (no parentId): WORKS — returns file in parentId 0AIp4DMTebyusUk9PVA (My Drive root)
          • Write with explicit parentId: FAILS — tested on daisy folder, inbox subfolder, and a brand new test folder
            • Error message: "User cannot add children to the specified folder"
              • OAuth revoke + reconnect: did not fix
                • App update: did not fix
                  • Account: Pro plan, claude.ai web
                    • Platform: macOS
                      • Closest existing issues: #51040 (feature request framing, different issue), #30457 (Cowork-specific, different issue)

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