[Bug] Task/TodoWrite tool missing from tool list after account switch

Bug Description
Title: Task/TodoWrite tool missing from tool list after switching accounts

Summary:
After switching Claude accounts (deleted ~/.claude/.credentials.json to force re-login under a different account), the TodoWrite/TaskCreate/TaskUpdate/TaskList tool no longer appears in the available tool set — not just failing to render in the UI, the tool itself is absent from the tool list the model can call.

Environment:

• Claude Code version: 2.1.237 (auto-updated today from 2.1.235, confirmed current)
• Platform: Windows 11 Pro
• Subscription: team
• rateLimitTier: default_raven

Steps to reproduce:

1. Was using Claude Code normally with the task list panel working (verified: ~/.claude/tasks/ has task data recorded across many sessions through Aug 18).
2. Deleted .credentials.json and switched to a different account/model.
3. Task tool no longer appears in the tool list.

Troubleshooting already done (ruled out):

• Confirmed no local disallowedTools/plugin config in settings.json blocking it
• Confirmed issue persists on a fully fresh session (not resumed — /resume was cancelled, started clean)
• Confirmed client is up to date (2.1.237)
• Account token/scopes (user:inference, user:mcp_servers, user:profile, user:sessions:claude_code, user:file_upload) look normal, nothing obviously restrictive

Expected: Task/TodoWrite tool should be available consistently regardless of which account is logged in (same plan tier).

Actual: Tool is completely absent from the tool list after the account switch.

Environment Info

• Platform: win32
• Terminal: windows-terminal
• Version: 2.1.237
• Feedback ID: b820b1c9-b5e8-47fe-a75a-dc8a76691217

Errors

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