How Does Gemini Cite Websites When It Grounds Answers in Search?

Gemini app, AI Mode, AI Overviews and the Gemini API: four different products

Gemini is a family of Google models, and four products put it in front of people. Two sit inside Google Search, one is a standalone assistant, and one is a developer tool. Each shows websites differently, and one robots.txt token affects only some of them, which is where most confusion starts.

The last column comes from Google’s common crawlers page, updated 15 October 2026. It names Gemini Apps and Grounding with Google Search on Vertex AI.

Our planned entry on Google AI Mode covers the Search side in detail.

Gemini grounding with Google Search: how it works

Gemini grounding with Google Search follows five steps, as Google’s developer documentation lays them out. The prompt arrives, the model judges whether a search would improve the answer, it writes and runs one or more queries, it reads and combines the results, and it returns an answer with citations attached.

Google AI for Developers describes this in Grounding with Google Search. It says grounding lets the model “cite verifiable sources beyond its knowledge cutoff”.

The citations are precise. Each one links a stretch of answer text, marked by start and end positions, to a source URL.

The API also returns the search queries it ran and suggested searches. Developers decide how to show all of this.

Google Cloud’s grounding overview gives the plain definition: connecting model output to “verifiable sources of information”.

Gemini sources: how the app shows them to users

Gemini shows sources in the app in two ways. A Sources button can appear at the bottom of a reply, and links can also sit inline throughout the text. Selecting them opens a side panel with the relevant links, which may include public websites, uploaded files or connected Workspace documents.

Google’s Gemini Apps Help is candid that “not all responses include related links or sources”. No button means no links were provided for that reply.

Direct quotes get special handling. If the app quotes a large amount of text from a webpage, Google says that page appears in the sources list.

Images work similarly. A web image in a reply shows its source with a link.

For site owners, the lesson is simple. A grounded, factual question is far more likely to produce a citation than a creative or opinion prompt.

Workspace adds a twist. When a user has connected Gmail or Drive, the sources list can mix their own files with public sites, and your page competes with documents the user already trusts.

Google-Extended and Gemini: what blocking changes

Google-Extended is a robots.txt token, not a crawler. Disallowing it tells Google not to use your crawled content to train future Gemini models or to ground answers in Gemini Apps and Vertex AI. It does not change whether your pages appear or rank in Google Search, including AI Overviews.

User-agent: Google-Extended
Disallow: /

Google is explicit on the Search point. It says Google-Extended “does not impact a site’s inclusion in Google Search nor is it used as a ranking signal”.

There is no separate Google-Extended visitor in your logs. Crawling uses existing Google user agents, and the token works only as a control.

So the trade-off is narrow. Blocking keeps your pages out of model training and app grounding, and it can cost you citations in the app.

Digital Magma advises most commercial clients to leave Google-Extended allowed. A publisher selling content has stronger reasons to block it than a manufacturer selling products.

Gemini for a business: why it matters

Gemini matters for a business because it reaches people inside tools they already use: Android phones, Chrome and Google Workspace. When a buyer asks the assistant for suppliers or a comparison, a grounded answer can link straight to your page. If you blocked Google-Extended without thinking, that link cannot happen.

Cost is not a barrier for Indian users. Google’s Indian subscriptions page lists a free plan at ₹0 a month with a Google account, alongside paid Google AI Pro and Ultra plans.

Language support helps too. Google says Grounding with Google Search works with all available languages.

That matters for Indian brands with Hindi or regional-language pages. A well-written Hindi page can be a grounding source for a Hindi question, so Digital Magma includes those pages when it checks indexing.

Gemini citations: 5 steps to be a source

Gemini citations go to pages Google has indexed and the model can quote cleanly. Digital Magma uses these five steps to make a site a dependable grounding source. Most of them are ordinary Search work, because grounding pulls from the Google Search index rather than a separate crawl.

1. Get indexed in Google. Grounding uses the Search index, so pages Google has not indexed cannot be cited.
2. Decide on Google-Extended deliberately. Leave it allowed unless you have a clear reason to opt out of training and app grounding.
3. Lead with facts. Open each section with the answer, then the numbers and names that support it.
4. Write quotable passages. Short, self-contained sentences are easier to attach to a citation.
5. Check in the app. Ask the app your buyers’ questions monthly and open the Sources panel each time.

An answer without sources tells you something too. It may mean the model answered from training alone, with no search run.

Gemini in our client work

Gemini work at Digital Magma usually starts with a robots.txt review. We look for Google-Extended blocks added by plugins, themes or a robots.txt file copied from another site, which can sit unnoticed for years. Removing an unwanted block is a one-line change, and it reopens the app as a place to be cited.

The rest is the same work that earns Google visibility. A Canadian welding equipment manufacturer we have served for three years holds 40+ keywords in Google’s top 10 and appears in AI Overviews.

Those same indexed pages are what grounding draws on. Digital Magma does not build separate pages for the assistant.

We make the existing ones easier to quote, then check the Sources panel to see whether the change landed.

Gemini: frequently asked questions

Gemini questions from site owners, answered briefly.

Gemini: related terms, sources and author

Gemini connects to these entries in the Digital Magma knowledge base:

• Google-Extended: the control token in full
• Grounding: tying answers to retrieved sources
• AI Overviews: Google’s AI summaries in Search results
• Large language model: what Gemini is underneath
• Should you block or allow AI crawlers?: the decision guide

Sources: Google’s common crawlers page, Google AI for Developers on Grounding with Google Search, Google Cloud’s grounding overview, Gemini Apps Help and Google’s Gemini subscriptions page for India. All were checked on 22 October 2026.