{"version":"2.1.307","anchor":"the-agent-tool-description-in-the-reminder-hook-pretool-bloc","canonical_anchor":"the-agent-tool-description-in-the-reminder-hook-pretool-bloc","heading":"Agent tool guidance reworded in the prompt after a hook blocks a tool","tier":"notice","area":"Subagents","scope":"individual","heads_up":false,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.307\/e\/the-agent-tool-description-in-the-reminder-hook-pretool-bloc","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.307","markdown":"### Agent tool guidance reworded in the prompt after a hook blocks a tool\n\nClaude's instructions for when to use a helper agent were reworded in the blocked-tool reminder prompt, now mentioning side quests\n\n**What**\n\nThe description of the `Agent` tool was rewritten in the prompt Claude Code sends when a hook blocks a tool before it runs. A hook is a script you can configure to run at set points; a tool is an action Claude takes, such as reading a file. The `Agent` tool is how Claude passes work to a subagent, a separate helper copy of Claude.\n\nThe list of good reasons to delegate changed:\n\n- Removed: using the tool when the task matches an available agent type.\n\n- Added: using it when you ask for a side quest that shouldn't block the main thread of work.\n\n- Kept: independent work that can run in parallel, and answers that need reading across several files.\n\n**Why**\n\nThis text is part of Claude's own instructions, so rewording it changes when Claude reaches for a helper. Side tasks you ask for are now named as a reason to delegate, while a matching agent type alone no longer is.\n\n- Area: Subagents\n- Tier: You'll notice\n- Useful: 1\/5\n- Signal: 1\/5\n- Scope: individual\n- Heads-up: no"}