Claude Code bug hides both Task tools and TodoWrite in interactive sessions on Windows
GerbenCdg · ghdev · 2026-07-18
- A GitHub issue reports that in Claude Code 2.1.214 on Windows, both the Task tools (TaskCreate/TaskUpdate/TaskList/TaskGet) and the TodoWrite fallback disappear in interactive sessions.
- The bug appears when using the newest model, claude-fable-5, and the issue says the tools are hidden by a server-side experiment called tenguvellumash evaluated at session startup.
- The reporter traced the gating logic in the binary: when the experiment matches, both tool families are disabled, leaving no task-tracking fallback in interactive mode.
- Headless mode (claude -p) still exposes the task tools, suggesting the bug is specific to the interactive session path.
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