Bug: WebFetch tool rewrites GitHub URLs to nicholasbrailo user, causing 404 errors

[zisen123]

Description

The WebFetch tool incorrectly rewrites GitHub repository URLs, replacing the original username in the path with a fixed username nicholasbrailo. This causes almost all GitHub repo page fetches to fail with StatusCode: non 2xx status code (404 GET).

Steps to Reproduce

1. Attempt to fetch any GitHub repository page via WebFetch, e.g.:
   • https://github.com/chidiwilliams/buzz
   • https://github.com/niedev/RTranslator
   • https://github.com/ggerganov/whisper.cpp
2. Observe the actual request URL and response

Actual Behavior

The tool rewrites the URL and sends requests to:

• https://github.com/nicholasbrailo/buzz (should be chidiwilliams/buzz)
• https://github.com/nicholasbrailo/RTranslator (should be niedev/RTranslator)
• https://github.com/nicholasbrailo/Whispering-Tiger (should be shabinder/Whispering-Tiger)

All result in StatusCode: non 2xx status code (404 GET ...).

Example error output:

StatusCode: non 2xx status code (404 GET https://github.com/nicholasbrailo/buzz)
StatusCode: non 2xx status code (404 GET https://github.com/nicholasbrailo/RTranslator)
StatusCode: non 2xx status code (404 GET https://github.com/nicholasbrailo/Whisper-WebUI)

Expected Behavior

WebFetch should request the exact URL provided without rewriting any part of the path.

Additional Context

• Not all GitHub URLs are affected -- some correctly go through (e.g., https://github.com/anomalyco/opencode/issues works fine), suggesting the bug may be specific to certain URL patterns or GitHub repo page formats.
• This makes the WebFetch tool nearly unusable for browsing/checking GitHub repositories.
• Environment: Windows, current opencode version (2026-05-16).

Observed URL Rewrite Patterns

Requested URL	Actual URL (rewritten)	Result
github.com/chidiwilliams/buzz	github.com/nicholasbrailo/buzz	404
github.com/niedev/RTranslator	github.com/nicholasbrailo/RTranslator	404
github.com/nicholasbrailo/Whispering-Tiger	github.com/nicholasbrailo/Whispering-Tiger	404
github.com/SakiRinn/LiveCaptions-Translator	github.com/SakiRinn/LiveCaptions-Translator	200 OK
github.com/thewh1teagle/vibe	github.com/thewh1teagle/vibe	200 OK
github.com/anomalyco/opencode/issues	github.com/anomalyco/opencode/issues	200 OK

Note: The pattern of which URLs get rewritten vs. pass through is inconsistent.