Part 3: Mastering Gemini CLI – Content Creation, Learning, and Multimodality

Source: Dev.to

Introduction

Welcome to the finale of our Gemini CLI series!

In Part 1 we installed the CLI and set up our environment. In Part 2 we explored coding workflows, data analysis, and extensions in the workspace.

Now we’re moving beyond simple text and code. We’ll explore multimodality (handling images, audio, and PDFs) and turn your terminal into the ultimate Personal Tutor. If you think the command line is only for boring text, this post will change your mind.

1. Content Creation with Extensions – The “NanoBanana” Workflow

One of Gemini’s greatest strengths is that it is multimodal—it understands code, text, images, and audio natively. To harness this in a terminal we use extensions.

Google recently introduced a robust extensions framework that lets you plug almost anything into the CLI. A popular community extension for creative content generation is NanoBanana. This tool connects your CLI to image‑generation models (e.g., gemini-2.5-flash-image), allowing you to create placeholder assets, icons, or visual concepts without leaving your code editor.

How to Connect NanoBanana

Giving your CLI “eyes for images” takes just one command.

Step 1 – Install the Extension

gemini extensions install https://github.com/gemini-cli-extensions/nanobanana

Step 2 – Restart and Verify

Restart the CLI. You can now use slash commands such as /generate or /icon.

Step 3 – Generate Creative Assets

Suppose you’re building a mobile app and need a quick placeholder icon for a “Cyberpunk Todo List.”

Prompt:

“Using the NanoBanana extension, /generate an app icon for a productivity app with a cyberpunk neon aesthetic. Make it simple, vector style, on a black background.”

Why this matters:

You orchestrate creative workflows without leaving your coding environment. You become a “technical artist” straight from the command line, rapidly prototyping UI elements while you code the backend.

Result:

2. Gemini CLI as Your Personal Tutor

The most underrated feature of Gemini 3 Flash is its massive Context Window. It can read huge files—entire books or long PDF research papers—in seconds, turning the CLI into a powerful study buddy that creates active‑learning material for you.

Scenario: The University Student / Self‑Learner

You have a 50‑page PDF called Advanced_Algorithms.pdf and an exam tomorrow.

Step 1 – Summarize

gemini "Read @Advanced_Algorithms.pdf. Summarize the key concepts by chapter. Use bullet points and simple language."

Step 2 – Generate Flashcards

gemini "Based on @Advanced_Algorithms.pdf, generate 10 flashcards. Format them as: 'Front: [Question] | Back: [Answer]' so I can import them into Anki."

Step 3 – Mock Exam

gemini "Act as a strict professor. Create a 5‑question multiple‑choice quiz based on Chapter 3 of the PDF. Don't give me the answers until I try to answer them."

3. Grounding Your Knowledge with Web Search

Large Language Models can sometimes “hallucinate” or rely on outdated training data. Gemini CLI includes a built‑in Google Search tool (often called Grounding) to fetch up‑to‑date information from the web.

Example: Learning a New Framework

If you ask a standard AI about the very latest version of a library, it might give you old code.

Prompt:

“I want to use the new features in React 19. Search the web for the official React 19 release notes and documentation. Then, explain the top 3 breaking changes and provide a code example for each.”

Why this builds authority:

By ensuring the /google tool (or web‑search capability) is enabled in your /settings, you guarantee that your code is up‑to‑date and fact‑checked against real‑world sources.

Conclusion – The “All‑in‑One” Developer

We’ve come a long way in this series:

• Installation & Basics: Navigated the CLI.
• Workflow Automation: Connected to extensions, workspace, and data analysis.
• Mastery: Used extensions like NanoBanana for creativity and transformed PDFs into interactive learning materials.

Now you have a multimodal, extensible, and knowledge‑grounded command‑line environment—your personal tutor, creative studio, and development hub all in one. Happy hacking!

The Gemini CLI isn't just a tool; it's a layer of intelligence over your entire operating system.  
It allows you to build faster, learn quicker, and create more—all from the comfort of your terminal.

**Now, it’s your turn.**

Download the CLI, install an extension, and build something amazing.  
Don't forget to share your creations!

*Special thanks to the DeepLearning.AI course ["Gemini CLI"](https://www.deeplearning.ai/short-courses/gemini-cli-code-and-create-with-an-open-source-agent/) for the inspiration for this blog post.*

[@leslysandra](https://dev.to/leslysandra)