Claude Code core
ComponentUpdates related to the core component of Claude Code.
All CORE Features
- Expanded availability of Remote Control functionality to a wider user base.(v2.1.58)
- Enabled Fast mode availability for Opus 4.6(v2.1.36)
- Added CLAUDE_CODE_TMPDIR environment variable to allow overriding the default temporary directory used for internal files.(v2.1.5)
- Added CLAUDE_CODE_DISABLE_BACKGROUND_TASKS environment variable to allow users to disable all background task functionality, including auto-backgrounding and the Ctrl+B shortcut.(v2.1.4)
All CORE Bug Fixes
- Fixed BashTool failing on Windows with EINVAL error(v2.1.55)
- Fixed an issue where the /fast command was not immediately available after enabling /extra-usage.(v2.1.37)
- Fixed startup performance issues when resuming sessions that have saved_hook_context(v2.1.29)
- Fixed crashes occurring on processors that lack AVX instruction support.(v2.1.17)
- Fixed an issue where the "Help improve Claude" setting fetch would fail due to a stale OAuth token; it now correctly refreshes OAuth and retries the fetch.(v2.1.4)
- Fixed issue with macOS code-sign warning when using Claude in Chrome integration(v2.0.76)
Releases with CORE Changes
v2.1.581 featureThis release focuses on expanding access to the Remote Control feature for more users. No other specific features or fixes were detailed in these notes.
v2.1.551 fixThis release focuses on stability, specifically addressing a critical bug where the BashTool failed on Windows systems due to an EINVAL error. Users on Windows should now experience reliable operation of the BashTool.
v2.1.44v2.1.371 fixThis release focuses on a specific functional fix related to command availability. Users will find that the /fast command is now immediately accessible after enabling the /extra-usage setting.
v2.1.361 featureThis release introduces the availability of Fast mode for the Opus 4.6 model, allowing users to leverage quicker processing capabilities. More details on this new mode can be found in the linked documentation.
v2.1.291 fixThis release focuses on stability and performance improvements. The primary change addresses slow startup times experienced when resuming sessions that utilize saved hook context.
v2.1.171 fixThis release focuses on stability and compatibility by addressing a critical issue. The primary change is a fix that prevents crashes on older processors lacking AVX instruction support.
v2.1.12v2.1.51 featureThis release introduces a new environment variable, CLAUDE_CODE_TMPDIR, which allows users to specify a custom temporary directory for internal processing files. This is particularly useful for environments with specific temporary storage requirements.
v2.1.41 feature1 fixThis release introduces a new environment variable, CLAUDE_CODE_DISABLE_BACKGROUND_TASKS, giving users granular control to disable background tasks entirely. Additionally, a critical bug affecting the "Help improve Claude" setting fetch due to stale OAuth tokens has been resolved.
v2.1.1v2.0.761 fixThis release addresses a specific technical issue related to code signing on macOS when using the Claude integration within the Chrome browser. Users should no longer encounter the code-sign warning.