What's new in CC 2.1.75 system prompts (+156 tokens)

• *NEW: Agent Prompt: Determine which memory files to attach — Agent for determining which memory files to attach for the main agent.
• NEW: System Prompt: One of six rules for using sleep command — One of the six rules for using the sleep command.
• NEW: System Prompt: System section — System section of the main system prompt.
• REMOVED: Agent Prompt: Memory selection — Removed instructions for selecting relevant memories for a user query (replaced by "Determine which memory files to attach").
• REMOVED: Tool Description: Bash (sleep — no retry loops) — Removed instruction to diagnose failures instead of retrying in sleep loops.
• REMOVED: Tool Description: Bash (sleep — use run_in_background) — Removed instruction to use run_in_background for long-running commands.
• Agent Prompt: Security monitor for autonomous agent actions (first part) — Added "Unseen Tool Results" evaluation rule: when an action's parameters depend on a tool result not visible in the transcript, treat those parameters as unverifiable and block if the action is high-severity.
• System Prompt: Teammate Communication — Updated SendMessage usage instructions from type: "message" / type: "broadcast" to to: "<name>" / to: "*" addressing pattern.
• System Reminder: Team Coordination — Updated SendMessage example from operation/target_agent_id/value fields to to/message/summary fields.
• Tool Description: ReadFile — Simplified usage notes around line length truncation and conditional read lines.
• Tool Description: SendMessageTool — Restructured around a unified three-field schema (to, message, summary) replacing the previous type/recipient/content pattern; protocol messages (shutdown, plan approval) are now nested inside the message field as structured objects; added addressing table; clarified that structured protocol messages cannot be broadcast.
• Tool Description: TeammateTool — Updated SendMessage references from type: "shutdown_request" to message: {type: "shutdown_request"}; changed field name from target_agent_id to to for sending messages.

Details: https://github.com/Piebald-AI/claude-code-system-prompts/releases/tag/v2.1.75