[BUG] Claude CLI 2.1.19 - Duplicate tool_use IDs with multiple --allowedTools

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Claude CLI version 2.1.19 generates duplicate tool_use IDs when invoking tools with 2 or more tools specified via --allowedTools, causing API 400 errors.

What Should Happen?

Commands with multiple --allowedTools should work correctly, as they did in version 2.1.7. Tool invocations should generate unique tool_use IDs regardless of how many tools are allowed.

Error Messages/Logs

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.1: `tool_use` ids must be unique"},"request_id":"req_011CXV6AipVaVof7PcDqLbFC"}

Steps to Reproduce

1. Install Claude CLI 2.1.19 via Homebrew (brew upgrade claude)

1. Run a command with a single allowed tool (works):

```bash
claude --model sonnet --allowedTools "Bash" -p "Run: echo hello" --print
Output: hello (success)

1. Run a command with two allowed tools (fails):

claude --model sonnet --allowedTools "Bash,Read" -p "List files using Bash" --print

1. Output: API Error: 400 due to tool use concurrency issues.
2. The error only occurs when:

• 2+ tools are specified via --allowedTools, AND
• A tool is actually invoked (prompts not requiring tool use succeed)

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.7

Claude Code Version

2.1.19

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_