Claude Code 2.1.128 Is Here: 37 CLI Fixes, Better EnterWorktree Behavior, and Cleaner MCP Reconnects
Claude Code keeps moving fast. Just a few days after the previous release, 2.1.128 has officially landed.
This update does not ship a flashy headline feature. Instead, it focuses on the everyday friction developers actually feel: 37 CLI changes aimed at stability, usability, and workflow reliability. For teams running agents every day, maintaining multi-branch projects, or wiring Claude Code into MCP services, this release makes the whole experience feel noticeably more dependable.
Three Key Highlights
1. EnterWorktree Now Creates Branches the Way You Expect
This is one of the most important fixes in the release.
Previous behavior: EnterWorktree created new branches from origin/<default-branch>, which meant local unpushed commits could be left behind when entering a worktree.
New behavior: Branches are now created directly from local HEAD, preserving all unpushed commits and matching the behavior described in the official documentation.
For developers who frequently work locally, test ideas in experimental branches, or jump between worktrees, this is a meaningful quality-of-life fix. The hidden “where did my commit go?” worktree trap is gone.
2. MCP Reconnects Are Much Cleaner
Previously, every MCP server reconnect could flood the chat window with a full tool list, making the session noisy and hard to scan.
This release improves that experience in two ways:
- Reconnects now show a concise summary by server prefix instead of dumping a full-screen tool list
- Tool counts are now displayed, and servers connected with 0 tools are clearly marked, making troubleshooting easier
As the MCP ecosystem continues to grow, this is exactly the kind of polish heavy users will notice immediately.
3. Better Subprocess Environment Isolation for OTEL
Subprocesses such as Bash, hooks, MCP, and LSP no longer inherit the CLI’s OTEL_* environment variables.
That means OTEL-instrumented apps launched through the Bash tool will no longer accidentally send traces to the CLI’s OTLP endpoint. For teams with mature observability setups, this keeps local debugging and tracing much cleaner.
Other Notable Fixes
UI / UX:
- Fixed focus mode flickering
- Fixed a bug where failed image drag-and-drop could leave the UI stuck
- Fixed several smaller issues around long URL clicks, markdown copy spacing, tab navigation, and more
- Progress indicators no longer flicker
Stability:
- Improved large-input handling: piped inputs over 10MB should no longer cause crash loops
- More robust parallel Shell tool calls: a single failed read-only command no longer breaks other calls in the same batch
More updates:
- Fixed Bedrock default model resolution
- Aligned Vim mode Space key behavior with standard Vim
--plugin-dirnow supports passing zip files directly--channelsnow supports console authentication- Fixed persistent Bash permission prompts in the SDK
- Multiple fixes around MCP update detection, the Components panel, and related areas
Small bonus: Typing /color without arguments now randomly picks a session color, adding a bit of personality to long-running development sessions.
How to Upgrade
Upgrading is simple and should only take a moment:
# Option 1
claude --update
# Option 2
claude upgrade
# Option 1
claude --update
# Option 2
claude upgrade
After upgrading, run /version in the CLI and confirm that the version is 2.1.128.
Recommended checks:
- If you use worktrees, test the new branch creation behavior
- If you rely on MCP, check whether reconnect output is now cleaner
- If your project uses OTEL instrumentation, confirm subprocess isolation works as expected
Final Thoughts
Claude Code 2.1.128 is not a “big feature” release, and that is exactly the point. It shows Anthropic’s current product direction clearly: make the foundation more reliable first, then keep refining the developer workflow.
The EnterWorktree and MCP reconnect improvements directly address two pain points that show up often in agentic development workflows. Combined with the broader stability fixes, this release should make long sessions, worktree switching, and parallel tool execution feel smoother overall.
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