Coding Assistance

Claude Code v2.1.197 introduces Claude Sonnet 5 as the new default model, featuring a native 1M-token context window for enhanced processing capabilities. The update includes promotional pricing of $2/$10 per million tokens through August 31, making it more cost-effective for users. This release represents a significant upgrade in model performance and context handling for the Claude Code platform.

Claude Code v2.1.170 introduces Claude Fable 5, a powerful Mythos-class model now available for general use with capabilities exceeding all previously released models. The release also fixes a critical bug where sessions launched from VS Code's integrated terminal failed to save transcripts and weren't resumable. Users should update to access Fable 5's enhanced capabilities and benefit from the session persistence fix.

This cookbook demonstrates building a vulnerability-discovery agent using the Claude Agent SDK that automatically threat-models C source code, hunts memory-safety bugs using built-in file tools (Read, Grep, Glob), and generates structured security reports. The agent operates in a multi-turn session with a bootstrap threat-modeling phase, an interview phase for owner input, and automated vulnerability finding and triage loops. The approach reduces false positives compared to traditional static analyzers by using Claude's reasoning to identify high-confidence memory-safety issues in a read-only sandbox environment.

Claude Code v2.1.113 introduces a native binary CLI replacing bundled JavaScript, enhances security with improved sandbox controls and bash rule matching, and fixes numerous UI/UX issues including fullscreen scrolling, multiline input navigation, and markdown rendering. Key improvements include faster /ultrareview with parallelization, better subagent error handling with 10-minute timeouts, and expanded Remote Control client capabilities. The release also addresses critical bugs in session management, MCP tool handling, and cross-platform compatibility.