How to Build Your First AI Agent in Google Gemini (Step-by-Step 2026)

Google Gemini is more than a chatbot. When connected to your Google Workspace tools – Gmail, Calendar, Drive, Docs, Sheets – it acts as an AI agent that can help you manage your digital life and work across multiple apps from a single conversation.

This guide shows you how to set it up and get real work done with it.

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What Google Gemini Can Do as an Agent

Unlike a standalone chatbot, Gemini with Google Workspace integration can:

• Read and draft Gmail messages
• Create and check Google Calendar events
• Find and summarise files in Google Drive
• Work inside Google Docs and Sheets to write and analyse
• Search the web and summarise current information
• Create content based on your existing files

Think of it as a very capable assistant who has access to your entire Google digital workspace.

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What You Need to Get Started

• A Google account (personal Gmail or Google Workspace / business account)
• Any modern browser (Chrome recommended)
• For full integration: A Google Workspace account (Business or Education plan)

Important note on free vs paid:

• **Gemini free (gemini.google.com):** Includes web access and basic chat. Limited Workspace integration.
• **Google One AI Premium (USD $19.99/month):** Includes full Gemini Advanced with deep Gmail, Drive, and Docs integration.
• **Google Workspace Business plans:** Include Gemini for Workspace add-on at additional cost.

For basic use and learning: the free tier is enough to start.

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Part 1: Set Up Basic Gemini

Step 1: Access Gemini

1. Open your browser and go to **gemini.google.com**
2. Sign in with your Google account
3. If this is your first time, you will see the Gemini chat interface

That is it. You are now using Gemini in its basic form.

Step 2: Try Your First Prompt

Type a question or request in the chat box at the bottom. For example:

• “Explain what an AI agent is in simple terms”
• “Write a professional email declining a meeting politely”
• “Give me 10 Instagram caption ideas for a Singapore coffee shop”

Gemini responds like any AI chatbot at this stage.

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Part 2: Enable Gemini Inside Google Workspace

This is where Gemini becomes genuinely powerful. Instead of switching between tabs, you work with AI directly inside the tools you already use.

Step 3: Enable Gemini in Gmail

1. Open **Gmail** at mail.google.com
2. Look for the **Gemini icon** (a small sparkle/star icon) on the right side of the compose window or in the sidebar
3. If you see it, Gemini is already available in your Gmail
4. If you do not see it, you may need a Google Workspace plan with Gemini included

What you can do in Gmail:

• Click the sparkle icon when composing an email to get Gemini to help you write it
• Click “Summarise this email” on a long email to get key points instantly
• Ask Gemini to “Reply professionally to this email declining the request”

Step 4: Enable Gemini in Google Docs

1. Open any document in **Google Docs**
2. Look for the **Help me write** button at the top left of a blank document, or the sparkle icon in the toolbar
3. Click it to open the Gemini panel on the right side

What you can do in Google Docs:

• Click on blank space in a document, then click the sparkle icon that appears in the margin
• Type a request like “Write an introduction for a business proposal for a Singapore marketing agency”
• Gemini writes directly into your document
• You can then edit, accept, or ask it to refine the output

Step 5: Enable Gemini in Google Sheets

1. Open any **Google Sheet**
2. Click **Extensions** in the menu bar
3. Look for **Gemini** in the Extensions menu (may appear as “Duet AI” on older Workspace accounts)
4. If not visible, access it via the sparkle icon in the formula bar

What you can do in Google Sheets:

• Ask Gemini to “Analyse this data and identify the top performing products”
• “Create a formula to calculate the percentage change between column B and column C”
• “Summarise this spreadsheet in 3 bullet points”
• It can also help you create new columns and apply formulas automatically

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Part 3: Use Gemini as a Full Agent (Gemini Advanced)

For the most powerful agent experience, Gemini Advanced (part of Google One AI Premium) lets Gemini access your Gmail, Drive, Calendar, and other Google services as one connected agent.

Step 6: Upgrade to Gemini Advanced (Optional)

1. Go to **one.google.com/explore-plan/gemini-advanced**
2. Subscribe to Google One AI Premium (USD $19.99/month, free trial available)
3. After subscribing, go back to gemini.google.com
4. You will see “Gemini Advanced” confirmed in the interface

Step 7: Turn On Extensions

Extensions let Gemini access your specific Google apps.

1. In Gemini, click the **Extensions** icon (the grid/plugin icon, usually near the top right or in settings)
2. Enable the extensions you want:

• **Google Workspace** (Gmail, Drive, Docs, Sheets, Calendar)
• **Google Search** (for real-time web results)
• **YouTube** (to search and summarise videos)
• **Google Maps** (for location-based queries)
• **Google Flights and Hotels** (for travel queries)

1. Toggle each one on

Step 8: Test the Agent Capabilities

Once extensions are on, try these agent-style prompts in gemini.google.com:

Across Gmail:

Find all emails from my supplier last month and summarise what was discussed.

Across Drive:

Find my most recent business proposal document and give me a summary of 
the key terms and pricing offered.

Across Calendar:

What meetings do I have this week? Is there a scheduling conflict on Thursday?

Multi-step task:

Check my Gmail for any unanswered client emails from the last 3 days, 
list them, and draft a short reply to each one telling them I will 
respond in full tomorrow.

Gemini will pull information from across your Google account, reason over it, and help you take action – all from one conversation.

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Part 4: Build a Gemini Agent Workflow with Google AppScript (No-Code Option)

For more advanced automation without third-party tools, Google Apps Script lets you build simple Gemini-powered agents that run automatically.

Step 9: Open Google Apps Script

1. Open a Google Sheet or Doc
2. Click **Extensions > Apps Script**
3. The Apps Script editor opens in a new tab

Step 10: Create a Simple Gemini Summary Agent

This example creates an agent that reads new emails and writes summaries to a Google Sheet.

function summariseNewEmails() {
  const threads = GmailApp.search('is:unread newer_than:1d', 0, 5);
  const sheet = SpreadsheetApp.getActiveSheet();
  
  threads.forEach(thread => {
    const messages = thread.getMessages();
    const lastMessage = messages[messages.length - 1];
    const subject = lastMessage.getSubject();
    const body = lastMessage.getPlainBody().substring(0, 500);
    
    sheet.appendRow([
      new Date(),
      subject,
      lastMessage.getFrom(),
      body + '...'
    ]);
  });
}

This script (without AI) extracts email summaries. To add Gemini AI processing, use the Gemini API via Google’s AI Studio (aistudio.google.com) with a free API key.

For non-coders: This level of customisation requires basic familiarity with scripts. Start with the built-in Extensions approach in Steps 3 to 8 first.

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Practical Use Cases for Singapore Businesses

Customer email triage:

Connect Gemini to Gmail and ask it every morning: “Summarise my unread emails and flag anything urgent.” This replaces 20 minutes of inbox scanning with a 30-second briefing.

Content research:

“Search for the latest news about AI adoption in Singapore this week and give me 5 key points I can use in a blog post.”

Meeting preparation:

“I have a meeting with a potential client at 3pm. Find any previous emails from them and give me a summary of what we have discussed.”

Report generation:

Paste your raw data or upload a Google Sheet and ask Gemini to write a plain-English performance summary.

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What Gemini Cannot Do (Yet)

• Execute long multi-step autonomous tasks without supervision
• Access systems outside your Google account without additional integrations
• Replace purpose-built tools for very specific industry tasks
• Guarantee accuracy for financial or legal analysis without human review

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Gemini is most powerful for people already embedded in Google’s ecosystem. If your business runs on Gmail, Docs, and Sheets, setting this up is one of the highest-value things you can do this week.

For complete guides on setting up AI agents and automations across tools like Gemini, Claude, and n8n, the AgentSetupSG playbook series covers it all.

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