How to enable claude's web search tool

[B1LLP4RK]

Thank you for the great tool as always.

Aas I recently setup anthropic's claude opus model in my server,
I realized I want to use the web search tool provided natively by their API. I don't have to setup search API in Librechat for this. As shown in the docs

curl https://api.anthropic.com/v1/messages \
    --header "x-api-key: $ANTHROPIC_API_KEY" \
    --header "anthropic-version: 2023-06-01" \
    --header "content-type: application/json" \
    --data '{
        "model": "claude-opus-4-6",
        "max_tokens": 4096,
        "messages": [
            {
                "role": "user",
                "content": "Search for the current prices of AAPL and GOOGL, then calculate which has a better P/E ratio."
            }
        ],
        "tools": [{
            "type": "web_search_20260209",
            "name": "web_search"
        }]
    }'

So I was wondering if there is a way i can setup this option in the http request?
It would be cool if there is a way i can add arbitrary additional attribute to the message sent to the AI server in general.

[Quick-JP]

Hi
I'm using this approach and it works for me.

By adding web_search: true in the preset section of librechat.yaml, you can create a dedicated model option with web search enabled. Make sure to also include interface.modelSelect: true so you can actually select it from the model selector.

Here's the config I'm using:

interface:
  modelSelect: true

modelSpecs:
  list:
    - name: claude_opus46_grounded
      label: "Claude Opus 4.6 (web search)"
      description: "Claude Opus 4.6 with Web Search Enabled"
      provider: anthropic
      preset:
        endpoint: anthropic
        model: "claude-opus-4-6"
        maxOutputTokens: 8096
        web_search: true

This lets you select the web-search-enabled model explicitly from the model selector, without needing to set up a separate search API.