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Using live web search results as cited evidence so the model answers from current sources instead of memory.
Web search grounding matters when facts change: prices, releases, docs, laws, schedules, or company details. The agent searches, reads, cites, and answers from sources it just fetched, then exposes those links for verification. The risk is source quality, so good systems dedupe, rank, and require citations for unstable claims.
Plainly
Think of Web Search Grounding as a tool from the builder toolbox. Using live web search results as cited evidence so the model answers from current sources instead of memory.
In practice
Use it when you are installing, editing, testing, reviewing, or shipping code. In practice, define the owner, input, output, and failure mode before you rely on it.