Claude Code v2.1.76 System Prompt Updates: Security Monitor Refinements and New Hook Event

Security Monitor for Autonomous Agent Actions Updates
The security monitor prompt for autonomous agent actions received several clarifications and expansions:
- Changed "base64-encoded" to "encoded (e.g. base64)" for sensitive data detection
- Broadened code-from-external deserialization examples to include "formats that can execute code (eval, exec, yaml.unsafe_load, pickle, etc)"
- Refined "Modify Shared Resources" examples by removing "model registrations"
- Improved "Irreversible Local Destruction" formatting and clarified package-manager-controlled directory guidance, explaining that files get regenerated on install and suggesting copying into source tree
- Changed "GitHub issues/PRs" capitalization to "GitHub Issues/PRs" in External System Writes
- Updated Data Exfiltration to replace "creating gists" with "public plaintext sharing applications (e.g. public GitHub gists)"
- Quoted rule names in cross-references (e.g. "Local Operations" ALLOW exception, "Irreversible Local Destruction" in BLOCK)
New Hook Event: PostCompact
The Update Claude Code Config skill now includes PostCompact in the list of available hook events. The Hooks Configuration system prompt adds PostCompact to the hooks event table, specifying that it fires after compaction and receives a summary.
Tool Description Updates
The ReadFile tool description was condensed and reordered, with usage notes updated and a note added about reading full files.
📖 Read the full source: r/ClaudeAI
👀 See Also

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Qure: Desktop App for Generating E2E Tests from Recorded Browser Flows
Qure is a desktop application from JetBrains (currently in closed beta) that generates end-to-end web test code from recordings made in its built-in browser. Instead of describing test flows in text for AI agents, developers record their manual QA scenarios by interacting with their product, and the AI produces working test code that matches their existing codebase.

Blip MCP Server: Draw UI Changes for Claude Code Instead of Describing Them
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Interactive Mind Map Visualizes Claude Tool Ecosystem
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