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v2.1.122 Claude Code Release Notes

Apr 28, 2026
Claude's Analysisby Sonnet 4.6
Full Analysis

Ten fixes address Bedrock/Vertex structured-output errors, MCP tool discovery gaps, broken /branch forks, and image resizing; !exit in bash mode no longer exits the CLI.

Changes
18
Total Changes (vs Average)
1.0×
Version Type
Patch
Release Focus
Bug Fixes
Day Since Prior Release
1
Release # This Month
#25 of 26
Bug Fix Ratio
61%
Post-Release Edits
—
Change Category
Ecosystem Impact
MCP has appeared in 8 of the last 10 releases, with AWS Bedrock and Google Vertex each in 4 of the last 10. This sustained Extensibility + Providers focus reflects ongoing multi-front cloud deployment parity work.
Key Themes
4Cloud Provider Stability|3MCP Tool Discovery & UX|7Session & CLI Reliability|4Observability & Terminal Polish
May Help If You've Noticed
Bedrock or Vertex calls fail unexpectedly on session title generation or other structured queries
MCP tools that connected after session start don't appear when you search for tools
You see blank assistant messages appearing mid-session for no obvious reason
Typing !exit in bash mode quits the whole CLI instead of running as a shell command
Images you send to Claude appear degraded—they may be resized beyond the correct maximum

Changes in Claude Code v2.1.122

Added1 change

  • •Added ANTHROPIC_BEDROCK_SERVICE_TIER environment variable to select a Bedrock service tier (default, flex, or priority), sent as the X-Amzn-Bedrock-Service-Tier header

Fixed11 changes

  • •Fixed /branch producing forks that fail with "tool_use ids were found without tool_result blocks" when the source session contained entries from rewound timelines
  • •Fixed /model not showing the Effort option for Bedrock application inference profile ARNs, and those ARNs not receiving output_config.effort
  • •Fixed Vertex AI / Bedrock returning invalid_request_error: output_config: Extra inputs are not permitted on session-title generation and other structured-output queries
  • •Fixed Vertex AI count_tokens endpoint returning 400 errors for users behind proxy gateways
  • •Fixed spinnerTipsOverride.excludeDefault not suppressing the time-based spinner tips
  • •Fixed ToolSearch missing MCP tools that connected after session start in nonblocking mode
  • •Fixed !exit / !quit in bash mode terminating the CLI instead of running as a shell command
  • •Fixed images sent to newer models being resized to 2576px per side instead of the correct 2000px maximum
  • •Fixed remote control session idle status redrawing twice per second, which could flood tmux -CC control pipes and pause the terminal
  • •Fixed assistant messages appearing blank in some sessions due to a stale view preference
  • •Fixed a malformed hooks entry in settings.json no longer invalidating the entire file

Other6 changes

  • •Pasting a PR URL into the /resume search box now finds the session that created that PR (GitHub, GitHub Enterprise, GitLab, and Bitbucket)
  • •/mcp now shows claude.ai connectors hidden by a manually-added server with the same URL, with a hint to remove the duplicate
  • •Clarified the /mcp message shown when an MCP server is still unauthorized after the browser sign-in flow
  • •OpenTelemetry: numeric attributes on api_request/api_error log events are now emitted as numbers, not strings
  • •OpenTelemetry: added claude_code.at_mention log event for @-mention resolution
  • •Voice mode: keybindings bound to Caps Lock now show an error since terminals don't deliver Caps Lock as a key event

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