v2.1.29 Claude Code Release Notes

Jan 31, 2026

Claude's Analysisby Sonnet 4.6

Fixes startup slowdown on session resume when saved hook context is present — targeted patch for hook-reliant workflows.

Change

Total Changes (vs Average)

0.1×

Version Type

Patch

Release Focus

Bug Fix

Day Since Prior Release

Release # This Month

#26 of 26

Bug Fix Ratio

100%

Post-Release Edits

—

Change Category

Key Themes

1Hook State & Startup Performance

May Help If You've Noticed

Claude Code feels sluggish to start after resuming a previous session

Fixed1 change

•Fixed startup performance issues when resuming sessions that have saved_hook_context

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v2.1.29 Claude Code Release Notes

Jan 31, 2026

Claude's Analysisby Sonnet 4.6

Full Analysis

Fixes startup slowdown on session resume when saved hook context is present — targeted patch for hook-reliant workflows.

Change

Total Changes (vs Average)

0.1×

Version Type

Patch

Release Focus

Bug Fix

Day Since Prior Release

Release # This Month

#26 of 26

Bug Fix Ratio

100%

Post-Release Edits

—

Change Category

Key Themes

1Hook State & Startup Performance

May Help If You've Noticed

Claude Code feels sluggish to start after resuming a previous session

Fixed1 change

•Fixed startup performance issues when resuming sessions that have saved_hook_context

v2.1.29 Claude Code Release Notes

Changes in Claude Code v2.1.29

Fixed1 change

v2.1.29 Claude Code Release Notes

Changes in Claude Code v2.1.29

Fixed1 change