Claude Code v2.1.49

What's changed

• Fixed Ctrl+C and ESC being silently ignored when background agents are running and the main thread is idle. Pressing twice within 3 seconds now kills all background agents.
• Fixed prompt suggestion cache regression that reduced cache hit rates.
• Fixed plugin enable and plugin disable to auto-detect the correct scope when --scope is not specified, instead of always defaulting to user scope
• Simple mode (CLAUDE_CODE_SIMPLE) now includes the file edit tool in addition to the Bash tool, allowing direct file editing in simple mode.
• Permission suggestions are now populated when safety checks trigger an ask response, enabling SDK consumers to display permission options
• Sonnet 4.5 with 1M context is being removed from the Max plan in favor of our frontier Sonnet 4.6 model, which now has 1M context. Please switch in /model.
• Fixed verbose mode not updating thinking block display when toggled via /config — memo comparators now correctly detect verbose changes
• Fixed unbounded WASM memory growth during long sessions by periodically resetting the tree-sitter parser
• Fixed potential rendering issues caused by stale yoga layout references
• Improved performance in non-interactive mode (-p) by skipping unnecessary API calls during startup
• Improved performance by caching authentication failures for HTTP and SSE MCP servers, avoiding repeated connection attempts to servers requiring auth
• Fixed unbounded memory growth during long-running sessions caused by Yoga WASM linear memory never shrinking
• SDK model info now includes supportsEffort, supportedEffortLevels, and supportsAdaptiveThinking fields so consumers can discover model capabilities.
• Added ConfigChange hook event that fires when configuration files change during a session, enabling enterprise security auditing and optional blocking of settings changes.
• Improved startup performance by caching MCP auth failures to avoid redundant connection attempts
• Improved startup performance by reducing HTTP calls for analytics token counting
• Improved startup performance by batching MCP tool token counting into a single API call
• Fixed disableAllHooks setting to respect managed settings hierarchy — non-managed settings can no longer disable managed hooks set by policy (#26637)
• Fixed --resume session picker showing raw XML tags for sessions that start with commands like /clear. Now correctly falls through to the session ID fallback.
• Improved permission prompts for path safety and working directory blocks to show the reason for the restriction instead of a bare prompt with no context