# Claude Code v0.2.42

> Claude Code v0.2.42, released 14 Mar 2025 (2025-03-14). 9 entries read out of the shipped bundle. Unofficial, and not affiliated with Anthropic.

Web version: https://changelogs.core-directive.com/v/0.2.42

## Changes

# Claude Code v0.2.42 Changelog

### Batch Tool Execution (Call Tool)

A powerful new tool that allows executing multiple tools in a single request for improved performance:

- **Tool Name**: `BatchTool` (displayed as "Call" to users)
- **Purpose**: Run multiple independent tool operations at once to reduce context usage and latency
- **Execution**: Tools are executed in parallel when possible, otherwise serially
- **Usage Example**:

`  claude> /call
  {
    "invocations": [
      {
        "tool_name": "Bash",
        "input": {
          "command": "git blame src/foo.ts"
        }
      },
      {
        "tool_name": "Glob",
        "input": {
          "pattern": "**/*.ts"
        }
      },
      {
        "tool_name": "Grep",
        "input": {
          "pattern": "function",
          "include": "*.ts"
        }
      }
    ]
  }`

### MCP Server Timeout Configuration

- **New Environment Variable**: `MCP_TIMEOUT`
- **Default**: 5000ms (5 seconds)
- **Usage**: Set custom timeout for MCP server operations

`  MCP_TIMEOUT=10000 claude  # Set 10 second timeout`

- **Benefit**: Allows users to adjust timeout for slower MCP servers

### Non-Blocking MCP Server Startup

- MCP server initialization no longer blocks the application from starting
- Improves startup time when MCP servers are slow to initialize
- Application becomes responsive immediately while MCP servers load in background

### Enhanced Help Mode

- New help display showing keyboard shortcuts when help is open
- Displays:
- `! for bash mode` - Quick access to bash command mode
- `/ for commands` - Access slash commands
- Platform-specific newline instructions:
- Mac with Karabiner: `shift + ⏎ for newline`
- Terminal supporting backslash: `\⏎ for newline`
- Default: `Backslash (\) + Return (⏎) for newline`

### WebFetch Security Enhancement

- Updated security requirement: URLs must be provided directly by the user (removed "in the current or a previous message" qualifier)
- Strengthens security by requiring explicit user-provided URLs

### HTTP Request Handling

- Switched from native `fetch` to axios for better control
- Added proper redirect handling with `maxRedirects: 0`
- Improved error messages with HTTP status codes
- Better content length limiting with `maxContentLength`

### Release Notes Update

- Added v0.2.41 release notes documenting:
- MCP server startup timeout configuration via MCP_TIMEOUT
- Non-blocking MCP server startup behavior

### Code Organization

- Renamed internal functions and variables for consistency
- Improved stream handling using named imports
- Better error handling in HTTP requests
- Enhanced batch tool execution with proper progress tracking and error aggregation