[BUG] GCP Vertex has made a WebSearch tool available for Claude models as of 17th September, but Claude Code can't see it
Status Fixed / completed
Maintainer reply None cached
Activity 7 comments · opened Sep 18, 2025 · closed Sep 24, 2025
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?
GCP Vertex has made a WebSearch tool available for Claude models as of 17th September, but Claude Code can't see it.
When I ask Claude to list available tools it lists the usual suspects (including e.g. 'WebFetch') but there's no sign of the new 'WebSearch'
What Should Happen?
Claude Code should be able to use GCP's newly integrated WebSearch tool when using Claude models in Vertex
Error Messages/Logs
Steps to Reproduce
Ask Claude Code, connected to models via Vertex and not Anthropic, to list its core tools
Claude Model
Not sure / Multiple models
Is this a regression?
No, this never worked
Last Working Version
_No response_
Claude Code Version
1.0.117
Platform
Google Vertex AI
Operating System
Ubuntu/Debian Linux
Terminal/Shell
Other
Additional Information
_No response_
7 Comments
After posting this I learned that its advertised roll out was delayed from 15th September to 22nd September by GCP without telling anyone (Source: GCP Support).
That said, I still have this problem even though it's meant to now be available.
Well, GCP are certainly making me look silly posting this bug. Support this morning says release is delayed "a few more days". I think I should close and reopen this if it doesn't work after it's actually launched! 🤞🏻
@henricook Have you gotten any updates regarding this topic? We can still not see that GCP Vertex has made WebSearch tool available for Claude models.
@ingvaldsen I'm about to poke GCP support again. The last they told me was that it "might need a few more days" on 23rd September. I'll come back and tell you what they say!
It's pretty odd that they send out such a big announcement email about it but then don't keep updating people via the same mechanism, or a release note, or something.
@henricook Thanks for following this up. It is strange with such a big announcement, and then go into complete silence and without any status update.
Unsatisfying I'm afraid, but FYI:
This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.