[BUG] WebFetch to github fails

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?

Claude Code fails always to fetch anything from github

<img width="740" height="221" alt="Image" src="https://github.com/user-attachments/assets/c08c224a-063d-4fff-b9f7-d5806c34198b" />

What Should Happen?

Fetch from github successfully.

Error Messages/Logs

WebFetch
https://raw.githubusercontent.com/reddit/devvit/main/devvit-docs/docs/get-started/create-app.md
Request failed with status code 404
WebFetch
https://raw.githubusercontent.com/reddit/devvit/main/devvit-docs/docs/capabilities/server/scheduler.md
<tool_use_error>Sibling tool call errored</tool_use_error>
WebFetch
https://raw.githubusercontent.com/reddit/devvit/main/devvit-docs/docs/capabilities/server/http-fetch.md
<tool_use_error>Sibling tool call errored</tool_use_error>

Steps to Reproduce

1. Prompt Claude Code anything that results in WebFetch tool invoked trying to get content from github
2. Error is produced

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude Code Web

Platform

Anthropic API

Operating System

Other

Terminal/Shell

Other

Additional Information

This occurs in all environments i've tested in (terminal, VS code extension, web interface). I've included the error from the web interface here as that removes any local issue on my side.