AI BriefingClaude Code System Prompt Update
·2026.07.08 23:56
Key point
Claude Code's system prompt has been updated for agent behavior, data schema, and guide routing.
Details
Key updates to the system prompt for Claude Code (CC) version 2.1.203 are as follows.
Data and Context Management
- The event schema for Background tasks has been changed to support replace-set semantics and ID-only payloads.
- A Context tip feature has been added, improving the ability to detect similar independent subtasks and fan them out to subagents.
Agent Behavior and Guidelines
- Guidelines have been strengthened so that when using Auto mode, safe alternatives are tried first, and when requesting permissions, concise sentences and bold text are used to obtain user consent.
- The routing scope of the Claude Guide agent has been expanded to distinguish between Claude Tag and more precise Claude API surfaces (SDK, Tool Runner, Managed Agents, etc.) in order to fetch the appropriate documentation.
- The code review (/code-review) agent is now required to clearly report each result (fixed, nochangeneeded, skipped) when executing fixes.
- A guideline has been added so that when a general-purpose agent performs a task, it carries it out directly instead of re-delegating the entire quota to another single subagent.
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