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Claude Code System Prompt Update

·2026.06.29 23:50

Key point

Claude Code's system prompt has been updated regarding agent security monitoring and tool-use metadata.

Details

Through the latest update to Claude Code (CC), the system prompt related to agent security monitoring features and tool-use metadata has been changed.

Key update details:

  • Enhanced security monitoring (v2.1.179):

    • Clarified the permission scheme so that, when read-only permission has been granted for a specific target, additional read commands for that target execute without requiring separate re-approval.
    • Improved so that when a user re-confirms (e.g., "proceed", "do it"), the specific target and reason for a previously blocked action are inherited, enabling accurate execution of the task without requiring the user to re-enter input.
    • Added security logic related to the Live-Shared Artifact feature: if a shared artifact contains sensitive information (passwords, personal information, etc.), exposure is restricted depending on whether the user is aware of it.
  • Introduction of tool-use metadata (v2.1.181):

    • Support added for passing metadata such as display name (displayname), server display name (serverdisplayname), and icon URL (iconurl) during tool use via the toolusemeta field.

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