Claude Code v0.2.126

# Claude Code v0.2.126 Changelog

The GitHub app installation process has been significantly improved with better error handling and user guidance:

• Prerequisite Checks: The CLI now performs comprehensive checks before attempting GitHub app installation:
• Verifies GitHub CLI (gh) is installed
• Checks authentication status
• Validates required permissions (specifically the "workflow" scope)

• Detailed Error Messages: When issues are encountered, users now receive specific instructions:

  # If GitHub CLI is not installed:
  - macOS: brew install gh
  - Windows: winget install --id GitHub.cli
  - Linux: See installation instructions at https://github.com/cli/cli#installation
  
  # If not authenticated:
  - Run: gh auth login
  
  # If missing workflow permissions:
  - Run: gh auth refresh -h github.com -s workflow

• Workflow Update Dialog: When an existing Claude workflow is detected, users are presented with three options:

1. Update workflow file with latest version
2. Skip workflow update (configure secrets only)
3. Exit without making changes

• Graceful Shutdown: A new cleanup mechanism ensures all pending operations complete before exit
• Cleanup functions are registered and executed on exit
• 2-second timeout prevents hanging on shutdown
• Handles process.exitCode properly for clean exits

• Configurable Timeout: New environment variable CLAUDE_CODE_OTEL_SHUTDOWN_TIMEOUT_MS allows customizing the OpenTelemetry shutdown timeout (default: 1000ms)
• Better Error Messages: When metrics flush times out, users receive helpful guidance:

  OpenTelemetry metrics flush timed out after [X]ms
  
  To resolve this issue, you can:
  1. Increase the timeout by setting CLAUDE_CODE_OTEL_SHUTDOWN_TIMEOUT_MS env var
  2. Check if your OpenTelemetry backend is experiencing scalability issues
  3. Disable OpenTelemetry by unsetting CLAUDE_CODE_ENABLE_TELEMETRY env var

• New Telemetry: Added metrics tracking for code editing tool permission decisions (accept/reject) for Edit, MultiEdit, Write, and NotebookEdit tools

• Improved support for the "sonnet" model identifier
• Better model selection logic that properly handles custom models and built-in model aliases

• The diff generation function now supports a singleHunk parameter for better control over diff output format

• Updated Node.js imports to use the node: prefix convention (e.g., import { cwd } from "node:process")

The GitHub app installation error codes have been expanded with new specific error types:

• GH_CLI_NOT_INSTALLED (7)
• GH_CLI_NOT_AUTHENTICATED (8)
• GH_CLI_MISSING_SCOPES (9)
• REPO_NOT_FOUND (10)
• WORKFLOW_FILE_EXISTS (11)
• APP_NOT_INSTALLED (12)

• Fixed potential issues with process exit handling in error scenarios
• Improved error handling for GitHub API calls with better 404 detection
• Enhanced workflow file detection to check for existing .github/workflows/claude.yml

• Version bumped from 0.2.125 to 0.2.126