Zed Turns Off Its ask_user Tool by Default After Subagents Made It Confusing

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Zed v1.17.1-pre, published 2026-08-24, disables the `ask_user` tool by default; PR #63038 cites formatting issues plus, more importantly, that the prompts "seem to be confusing when sub-agents are used, which are not always visible immediately." Re-enable it with `"ask_user": true` inside an agent profile in settings. The general lesson for multi-agent setups is that a clarification tool assumes exactly one visible questioner, and that assumption breaks the moment a subagent you cannot see is the one asking.