v2.1.45 Claude Code Release Notes

Feb 17, 2026

Claude's Analysisby Sonnet 4.6

Claude Sonnet 4.6 launches with fixes for Agent Teams on Bedrock/Vertex/Foundry, Task tool crashes, macOS sandbox errors, memory leaks, and plugins not loading after install.

Changes

Total Changes (vs Average)

1.3×

Version Type

Patch

Release Focus

Mixed

Day Since Prior Release

Release # This Month

#14 of 28

Bug Fix Ratio

47%

Post-Release Edits

—

Change Category

Ecosystem Impact

macOS makes its first appearance in 10 releases with a sandbox write fix. Bedrock, Vertex, and Foundry appear together for the Agent Teams env-var fix — provider parity has now featured in 2 of the last 5 releases.

Key Themes

1Claude Sonnet 4.6 now available|1Agent Teams fixed across all cloud providers|6Six-fix stability sweep|4SDK and extensibility expansion|2Startup and memory performance

May Help If You've Noticed

Your Agent Teams sessions fail when running on Bedrock, Vertex, or Foundry

Added4 changes

•Added support for Claude Sonnet 4.6
•Added support for reading enabledPlugins and extraKnownMarketplaces from --add-dir directories
•Added spinnerTipsOverride setting to customize spinner tips — configure tips with an array of custom tip strings, and optionally set excludeDefault: true to show only your custom tips instead of the built-in ones
•Added SDKRateLimitInfo and SDKRateLimitEvent types to the SDK, enabling consumers to receive rate limit status updates including utilization, reset times, and overage information

Improved4 changes

•Improved startup performance by removing eager loading of session history for stats caching
•Improved memory usage for shell commands that produce large output — RSS no longer grows unboundedly with command output size
•Improved collapsed read/search groups to show the current file or search pattern being processed beneath the summary line while active
•[VSCode] Improved permission destination choice (project/user/session) to persist across sessions

Fixed7 changes

•Fixed Agent Teams teammates failing on Bedrock, Vertex, and Foundry by propagating API provider environment variables to tmux-spawned processes (anthropics/claude-code#23561)
•Fixed sandbox "operation not permitted" errors when writing temporary files on macOS by using the correct per-user temp directory (anthropics/claude-code#21654)
•Fixed Task tool (backgrounded agents) crashing with a ReferenceError on completion (anthropics/claude-code#22087)
•Fixed autocomplete suggestions not being accepted on Enter when images are pasted in the input
•Fixed skills invoked by subagents incorrectly appearing in main session context after compaction
•Fixed excessive .claude.json.backup files accumulating on every startup
•Fixed plugin-provided commands, agents, and hooks not being available immediately after installation without requiring a restart

Added4 changes

•Added support for Claude Sonnet 4.6

•Added support for reading enabledPlugins and extraKnownMarketplaces from --add-dir directories

•Added spinnerTipsOverride setting to customize spinner tips — configure tips with an array of custom tip strings, and optionally set excludeDefault: true to show only your custom tips instead of the built-in ones

•Added SDKRateLimitInfo and SDKRateLimitEvent types to the SDK, enabling consumers to receive rate limit status updates including utilization, reset times, and overage information

Improved4 changes

•Improved startup performance by removing eager loading of session history for stats caching

•Improved memory usage for shell commands that produce large output — RSS no longer grows unboundedly with command output size

•Improved collapsed read/search groups to show the current file or search pattern being processed beneath the summary line while active

•[VSCode] Improved permission destination choice (project/user/session) to persist across sessions

Fixed7 changes

•Fixed Agent Teams teammates failing on Bedrock, Vertex, and Foundry by propagating API provider environment variables to tmux-spawned processes (anthropics/claude-code#23561)

•Fixed sandbox "operation not permitted" errors when writing temporary files on macOS by using the correct per-user temp directory (anthropics/claude-code#21654)

•Fixed Task tool (backgrounded agents) crashing with a ReferenceError on completion (anthropics/claude-code#22087)

•Fixed autocomplete suggestions not being accepted on Enter when images are pasted in the input

•Fixed skills invoked by subagents incorrectly appearing in main session context after compaction

•Fixed excessive .claude.json.backup files accumulating on every startup

•Fixed plugin-provided commands, agents, and hooks not being available immediately after installation without requiring a restart

v2.1.45 Claude Code Release Notes

Changes in Claude Code v2.1.45

Added4 changes

Improved4 changes

Fixed7 changes

v2.1.45 Claude Code Release Notes

Changes in Claude Code v2.1.45

Added4 changes

Improved4 changes

Fixed7 changes