[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_

View original on GitHub ↗

7 Comments

henricook · 1 year ago

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.

henricook · 1 year ago

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! 🤞🏻

ingvaldsen · 1 year ago

@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.

henricook · 1 year ago

@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.

ingvaldsen · 1 year ago

@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.

henricook · 1 year ago

Unsatisfying I'm afraid, but FYI:

I understand that you are seeing a huge delay. Apologies for the huge delay, 
due to unseen circumstances the launch is getting delayed. We currently don't 
have a fixed ETA. Please rest ensured we will try to get a fixed ETA from the team
github-actions[bot] · 1 year ago

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.