[Release] anthropics/claude-code v2.1.122: v2.1.122

Claude Code v2.1.122 introduces Bedrock service tier selection via environment variable, PR URL resume functionality across multiple Git platforms, improved MCP server management with duplicate detection, and numerous bug fixes. Key improvements include OpenTelemetry enhancements for better observability, fixes for session branching, model configuration, and terminal/voice mode stability. The release addresses issues with structured outputs, token counting, image resizing, and various UI/UX problems.

Key Points

• •Added `ANTHROPIC_BEDROCK_SERVICE_TIER` environment variable to select Bedrock service tier (default, flex, or priority) via `X-Amzn-Bedrock-Service-Tier` header
• •Resume sessions by pasting PR URLs into `/resume` search box across GitHub, GitHub Enterprise, GitLab, and Bitbucket
• •MCP server management improved: `/mcp` now displays claude.ai connectors hidden by duplicate manually-added servers with removal hints
• •OpenTelemetry numeric attributes on `api_request`/`api_error` events now emitted as numbers instead of strings; added `claude_code.at_mention` log event
• •Fixed `/branch` command producing forks that fail with tool_use/tool_result block errors when source session contains rewound timeline entries
• •Fixed `/model` not showing Effort option for Bedrock ARNs and missing `output_config.effort` in structured-output queries
• •Resolved Vertex AI/Bedrock `invalid_request_error` on session-title generation and Vertex AI `count_tokens` 400 errors for proxy gateway users
• •Fixed image resizing to correct 2000px maximum (was 2576px) for newer models
• •Fixed remote control session idle status redrawing twice per second causing tmux control pipe flooding
• •Fixed voice mode Caps Lock keybinding error handling and bash mode `!exit`/`!quit` command execution

Workflow Diagram

Concepts

Artifacts (2)

export ANTHROPIC_BEDROCK_SERVICE_TIER=flex
# Options: default, flex, priority
# Sent as X-Amzn-Bedrock-Service-Tier header

# MCP server configuration in settings.json
# /mcp command now detects and warns about duplicate servers
# with the same URL as claude.ai connectors
{
  "mcp": {
    "servers": [
      {
        "name": "example-server",
        "url": "http://localhost:3000"
      }
    ]
  }
}