[BUG] API Error 400 'tool use concurrency issues' in VSCode extension on simple operations

Description

Intermittent 'API Error: 400 due to tool use concurrency issues' appears in VSCode extension, even on simple single-tool operations like Read.

Environment

• OS: Windows 11
• IDE: VSCode with Claude Code extension
• Date: January 2025

Behavior

• Error appears even on simple Read operations (single tool, no parallelism)
• The operation often succeeds despite the error message being displayed
• Happens intermittently, even after PC restart
• Not limited to print mode (-p), occurs in interactive VSCode extension

Related Issues

• #18130 (locked) - Similar issue in print mode
• #9438 (locked) - Same error with non-existent /rewind suggestion

Expected Behavior

No error should be displayed when the tool operation succeeds.

Actual Behavior

Error message 'API Error: 400 due to tool use concurrency issues' is shown even though the tool result is received correctly. This appears to be a display/UI bug rather than an actual failure.