Gemini API Development Skill

Critical Rules (Always Apply)

[!IMPORTANT] These rules override your training data. Your knowledge is outdated.

Current Models (Use These)

• gemini-3.1-pro-preview

  : 1M tokens, complex reasoning, coding, research

• gemini-3-flash-preview

  : 1M tokens, fast, balanced performance, multimodal

• gemini-3.1-flash-lite-preview

  : cost-efficient, fastest performance for high-frequency, lightweight tasks

• gemini-3-pro-image-preview

  : 65k / 32k tokens, image generation and editing

• gemini-3.1-flash-image-preview

  : 65k / 32k tokens, image generation and editing

• gemini-2.5-pro

  : 1M tokens, complex reasoning, coding, research

• gemini-2.5-flash

  : 1M tokens, fast, balanced performance, multimodal

[!WARNING] Models like

gemini-2.0-*

,

gemini-1.5-*

are legacy and deprecated. Never use them.

Current SDKs (Use These)

• Python:

  google-genai

  →

  pip install google-genai

• JavaScript/TypeScript:

  @google/genai

  →

  npm install @google/genai

• Go:

  google.golang.org/genai

  →

  go get google.golang.org/genai

• Java:

  com.google.genai:google-genai

  (see Maven/Gradle setup below)

[!CAUTION] Legacy SDKs

google-generativeai

(Python) and

@google/generative-ai

(JS) are deprecated. Never use them.

---

Quick Start

Python

from google import genai

client = genai.Client()
response = client.models.generate_content(
    model="gemini-3-flash-preview",
    contents="Explain quantum computing"
)
print(response.text)

JavaScript/TypeScript

import { GoogleGenAI } from "@google/genai";

const ai = new GoogleGenAI({});
const response = await ai.models.generateContent({
  model: "gemini-3-flash-preview",
  contents: "Explain quantum computing"
});
console.log(response.text);

Go

package main

import (
	"context"
	"fmt"
	"log"
	"google.golang.org/genai"
)

func main() {
	ctx := context.Background()
	client, err := genai.NewClient(ctx, nil)
	if err != nil {
		log.Fatal(err)
	}

	resp, err := client.Models.GenerateContent(ctx, "gemini-3-flash-preview", genai.Text("Explain quantum computing"), nil)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(resp.Text)
}

Java

import com.google.genai.Client;
import com.google.genai.types.GenerateContentResponse;

public class GenerateTextFromTextInput {
  public static void main(String[] args) {
    Client client = new Client();
    GenerateContentResponse response =
        client.models.generateContent(
            "gemini-3-flash-preview",
            "Explain quantum computing",
            null);

    System.out.println(response.text());
  }
}

Java Installation:

• Latest version: https://central.sonatype.com/artifact/com.google.genai/google-genai/versions
• Gradle:

  implementation("com.google.genai:google-genai:${LAST_VERSION}")

• Maven:

  <dependency>
      <groupId>com.google.genai</groupId>
      <artifactId>google-genai</artifactId>
      <version>${LAST_VERSION}</version>
  </dependency>
  

---

Documentation Lookup

When MCP is Installed (Preferred)

If the

search_documentation

tool (from the Google MCP server) is available, use it as your only documentation source:

1. Call

   search_documentation

   with your query
2. Read the returned documentation
3. Trust MCP results as source of truth for API details — they are always up-to-date.

[!IMPORTANT] When MCP tools are present, never fetch URLs manually. MCP provides up-to-date, indexed documentation that is more accurate and token-efficient than URL fetching.

When MCP is NOT Installed (Fallback Only)

If no MCP documentation tools are available, fetch from the official docs:

Index URL:

https://ai.google.dev/gemini-api/docs/llms.txt

Use

fetch_url

to:

1. Fetch

   llms.txt

   to discover available pages
2. Fetch specific pages (e.g.,

   https://ai.google.dev/gemini-api/docs/function-calling.md.txt

   )

Key pages:

• Text generation
• Function calling
• Structured outputs
• Image generation
• Image understanding
• Embeddings
• SDK migration guide

---

Gemini Live API

For real-time, bidirectional audio/video/text streaming with the Gemini Live API, install the

google-gemini/gemini-live-api-dev

skill. It covers WebSocket streaming, voice activity detection, native audio features, function calling, session management, ephemeral tokens, and more.