[BUG] Claude for Excel & PowerPoint: "Extra inputs are not permitted" on code_execution_20250825.use_web_search_purpose

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?

aBoth Claude for Excel and Claude for PowerPoint Office Add-ins fail with a Pydantic validation error immediately upon opening. The add-ins are completely unusable.

Claude for PowerPoint:
configurations.0.code_execution_20250825.use_web_search_purpose: Extra inputs are not permitted

Claude for Excel:
configurations.1.code_execution_20250825.use_web_search_purpose: Extra inputs are not permitted

This appears to be a server-side schema mismatch — the Office Add-ins send a field (use_web_search_purpose) inside the code_execution_20250825 configuration block that the API no longer accepts.

What Should Happen?

aThe Claude for Excel and Claude for PowerPoint add-ins should open and function normally without validation errors.

Error Messages/Logs

configurations.0.code_execution_20250825.use_web_search_purpose: Extra inputs are not permitted
configurations.1.code_execution_20250825.use_web_search_purpose: Extra inputs are not permitted

Steps to Reproduce

a1. Open Excel or PowerPoint (Microsoft 365, Windows)

1. Open the Claude by Anthropic Add-in from the side panel
2. 3. Error appears immediately - add-in is unusable
3. 4. Tried clearing Office Add-in cache (%LOCALAPPDATA%\Microsoft\Office\16.0\Wef\) - issue persists
4. 5. Restarted Office applications - issue persists

Note: This is NOT a Claude Code issue but affects the Claude Office Add-ins (Excel & PowerPoint). Filed here as there is no dedicated repo for the Office add-ins.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

N/A - This bug affects the Claude Office Add-ins, not Claude Code

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

• Plan: Max
• - Date: February 14, 2026
• - - Office: Microsoft 365 (Windows)
• - - - The error is a Pydantic validation error indicating that the field use_web_search_purpose inside the code_execution_20250825 configuration block is being rejected by the API. This suggests a schema mismatch between what the Office Add-ins send and what the API currently accepts - likely introduced by a recent server-side update.
• - - - - Clearing the Office Add-in cache (%LOCALAPPDATA%\Microsoft\Office\16.0\Wef\) did NOT resolve the issue.