[BUG] Write fails with file_path and content missing

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?

When working on long trajectories (specially with sub-agents) claude code fails to write results to file:

<img width="1078" height="612" alt="Image" src="https://github.com/user-attachments/assets/1e17a980-0ea6-4673-9077-824747a4f3b4" />

What Should Happen?

Claude should write to file 100 percent of the time

Error Messages/Logs

● Now I have everything I need. Let me compile the comprehensive wiki article and update the raw sources.
  ⎿  Error: InputValidationError: Write failed due to the following issues:
     The required parameter `file_path` is missing
     The required parameter `content` is missing
  ⎿  Error: InputValidationError: Write failed due to the following issues:
     The required parameter `file_path` is missing
     The required parameter `content` is missing
  ⎿  Error: InputValidationError: Write failed due to the following issues:
     The required parameter `file_path` is missing
     The required parameter `content` is missing
  ⎿  Error: InputValidationError: Write failed due to the following issues:
     The required parameter `file_path` is missing
     The required parameter `content` is missing
  ⎿  Error: InputValidationError: Write failed due to the following issues:
     The required parameter `file_path` is missing
     The required parameter `content` is missing
  ⎿  Error: InputValidationError: Write failed due to the following issues:
     The required parameter `file_path` is missing
     The required parameter `content` is missing
  ⎿  Error: InputValidationError: Write failed due to the following issues:
     The required parameter `file_path` is missing
     The required parameter `content` is missing
  ⎿  Error: InputValidationError: Write failed due to the following issues:
     The required parameter `file_path` is missing
     The required parameter `content` is missing
  ⎿  Error: InputValidationError: Write failed due to the following issues:
     The required parameter `file_path` is missing
     The required parameter `content` is missing
  ⎿  Error: InputValidationError: Write failed due to the following issues:
     The required parameter `file_path` is missing
     The required parameter `content` is missing

Steps to Reproduce

example prompt:
hey! I need to find all the GPU and Hosted AI model inference providers. Then find if they have APIs available to create
infrastructure and then find which ones have terraform providers available as official sources. If unofficial ones are available
then document them as unofficial. While you are at it, also note the cost structure for these providers as well - both the hosted
inference cost and the per hour GPU rental cost (+ data movement cost if applicable).

CLAUDE.md setup:

Research!

We must seek the truth and do deep research on topics!

Objective

Your objective is to do deep research on topics and provide guides on the topic as markdown files.

File Structure

The structure of the projet is and must remain as:

claude-research
    ├── index.md
    ├── log
    ├── raw
    └── wiki

4 directories, 1 file

• log/ - the log of work done during edits.
• raw/ - the raw workspace to store notes when doing deep search.
• wiki/ - this directory stored the extracted knowledge from raw sources.
• (index.md)[index.md] is used as a lookup for what is stored in wiki

File structure

raw/

(for source files)
markdown files
add link to the source (only link - content is not needed)
add datetime accessed
add date published (if available)
each prompt may have multiple sources used.

(for rough work [if needed])
prompt for which this is needed
content that may be needed later

wiki/

add research topic
links to sources used (link to files in raw/)

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.104

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_