[BUG] Write tool fails with "object instead of string" error when writing files

Environment

• Platform: darwin (macOS)
• Claude CLI version: 1.0.94
• Operating System: e.g. macOS 15.6
• Terminal: Apple Terminal
• Model: Claude Sonnet 4 (claude-sonnet-4-20250514)
• Feedback ID: 92e30ddf-0a7b-45e1-a630-e620c6b26e99

Bug Description

File writes consistently fail on project initialization:
<img width="971" height="678" alt="Image" src="https://github.com/user-attachments/assets/83253eed-66c2-4247-9dba-3e619cb2e700" />

Specifically (as generated by Claude):

• The Write tool consistently fails with InputValidationError: The parameter 'content' type is

expected as string but provided as object when attempting to write JSON content to files

• This occurs even when the JSON is properly formatted as a string
• Simple text files write successfully, indicating the issue is specific to JSON content

parsing

• The error suggests the tool parameter parser is incorrectly interpreting JSON strings as

objects

Steps to Reproduce

1. Use Write tool to create a JSON file (e.g., manifest.json for Chrome extension or Node app)
2. Provide properly formatted JSON as string content
3. Tool fails with type validation error

Expected Behavior

<!-- What you expected to happen -->
Files are written successfully

Actual Behavior

<!-- What actually happened -->
Consistent Error writing file, Claude ended up falling back to use bash scripts to echo and pipe directly into each file.

Additional Context

<!-- Add any other context about the problem here, such as screenshots, logs, etc. -->

<img width="978" height="628" alt="Image" src="https://github.com/user-attachments/assets/30cc4c2b-5d85-4d57-bea6-66a82b14e000" />