How to enable Gemini's google_search tool?

[Jouo]

Gemini API: https://ai.google.dev/gemini-api/docs/google-search#rest

By using curl I asked the date and it returned the correct answer, so my API Key permissions are fine.

However, in aichat with gemini:gemini-3.1-flash-lite-preview the same query returns a 2024 date, therefore the live web search tool is not being used.

config.yaml

clients:
  - type: gemini
    patch:
      tools:
        - google_search: {}

FWIW: I already tried different temperature values and supported gemini models.

What is the correct way to enable it?

EDIT: Does anyone know how to limit output tokens?