API Error: tool_use ids must be unique after tool execution

Bug Description

Claude Code CLI fails with API error after any tool execution completes. The tool action succeeds but the response handling fails.

Error Message

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

Environment

• Claude Code Version: 2.1.19
• OS: Ubuntu 24.04 (Vultr VM)
• Installation: curl -fsSL https://claude.ai/install.sh | sh

Steps to Reproduce

1. Fresh VM with clean ~/.claude directory
2. Run any prompt that triggers tool use:

``bash
cd /tmp && mkdir test && cd test
~/.local/bin/claude --dangerously-skip-permissions -p "Create a file called hello.txt containing Hello World"
``

1. Error occurs on the response after tool execution

Observed Behavior

• First API call succeeds (Claude decides to create file)
• Tool executes successfully (file IS created with correct content)
• Second API call fails with "tool_use ids must be unique" error
• Conversation breaks

Expected Behavior

Tool execution should complete and Claude should respond with confirmation.

Verification

• File hello.txt exists after error (6 bytes, correct content)
• Simple prompts WITHOUT tools work fine: claude -p "Say hello" → succeeds
• Issue persists after:
• Killing all claude processes
• Deleting ~/.claude directory completely
• Reinstalling Claude CLI
• VM restart

Additional Context

This appears to be the CLI generating duplicate tool_use IDs when constructing the message payload for the second API call after tool execution completes.