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This skill enables developers to build applications utilizing Google's advanced Gemini AI models, supporting features like text generation, multimodal content processing, function calling, structured outputs, and code execution. It offers SDKs for multiple programming languages, including Python, JavaScript/TypeScript, Java, and Go, with clear guidance on model selection and API integration. Ideal for AI developers and integrators seeking to leverage Google's cutting-edge generative and multimodal AI capabilities in their projects.

npx skills add https://github.com/google-gemini/gemini-skills --skill gemini-api-dev

Gemini API Development Skill

Overview

The Gemini API provides access to Google's most advanced AI models. Key capabilities include:

  • Text generation - Chat, completion, summarization
  • Multimodal understanding - Process images, audio, video, and documents
  • Function calling - Let the model invoke your functions
  • Structured output - Generate valid JSON matching your schema
  • Code execution - Run Python code in a sandboxed environment
  • Context caching - Cache large contexts for efficiency
  • Embeddings - Generate text embeddings for semantic search

Current Gemini Models

  • gemini-3-pro-preview: 1M tokens, complex reasoning, coding, research
  • gemini-3-flash-preview: 1M tokens, fast, balanced performance, multimodal
  • gemini-3-pro-image-preview: 65k / 32k tokens, image generation and editing

[!IMPORTANT] Models like gemini-2.5-*, gemini-2.0-*, gemini-1.5-* are legacy and deprecated. Use the new models above. Your knowledge is outdated.

SDKs

  • Python: google-genai install with pip install google-genai
  • JavaScript/TypeScript: @google/genai install with npm install @google/genai
  • Go: google.golang.org/genai install with go get google.golang.org/genai
  • Java:
    • groupId: com.google.genai, artifactId: google-genai
    • Latest version can be found here: https://central.sonatype.com/artifact/com.google.genai/google-genai/versions (let's call it LAST_VERSION)
    • Install in build.gradle: 
      implementation("com.google.genai:google-genai:${LAST_VERSION}")
    • Install Maven dependency in pom.xml: 
      <dependency>
    <groupId>com.google.genai</groupId>
    <artifactId>google-genai</artifactId>
    <version>${LAST_VERSION}</version>
</dependency>

[!WARNING] Legacy SDKs google-generativeai (Python) and @google/generative-ai (JS) are deprecated. Migrate to the new SDKs above urgently by following the Migration Guide.

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());
  }
}

API spec (source of truth)

Always use the latest REST API discovery spec as the source of truth for API definitions (request/response schemas, parameters, methods). Fetch the spec when implementing or debugging API integration:

  • v1beta (default): https://generativelanguage.googleapis.com/$discovery/rest?version=v1beta Use this unless the integration is explicitly pinned to v1. The official SDKs (google-genai, @google/genai, google.golang.org/genai) target v1beta.
  • v1: https://generativelanguage.googleapis.com/$discovery/rest?version=v1 Use only when the integration is specifically set to v1. When in doubt, use v1beta. Refer to the spec for exact field names, types, and supported operations.

How to use the Gemini API

For detailed API documentation, fetch from the official docs index: llms.txt URL: https://ai.google.dev/gemini-api/docs/llms.txt This index contains links to all documentation pages in .md.txt format. Use web fetch tools to:

  1. Fetch llms.txt to discover available documentation pages
  2. Fetch specific pages (e.g., https://ai.google.dev/gemini-api/docs/function-calling.md.txt)

Key Documentation Pages

[!IMPORTANT] Those are not all the documentation pages. Use the llms.txt index to discover available documentation pages

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.

GitHub Owner

Owner: google-gemini

GitHub Links

SKILL.md

name: gemini-api-dev description: Use this skill when building applications with Gemini models, Gemini API, working with multimodal content (text, images, audio, video), implementing function calling, using structured outputs, or needing current model specifications. Covers SDK usage (google-genai for Python, @google/genai for JavaScript/TypeScript, com.google.genai:google-genai for Java, google.golang.org/genai for Go), model selection, and API capabilities.

Gemini API Development Skill

Overview

The Gemini API provides access to Google's most advanced AI models. Key capabilities include:

  • Text generation - Chat, completion, summarization
  • Multimodal understanding - Process images, audio, video, and documents
  • Function calling - Let the model invoke your functions
  • Structured output - Generate valid JSON matching your schema
  • Code execution - Run Python code in a sandboxed environment
  • Context caching - Cache large contexts for efficiency
  • Embeddings - Generate text embeddings for semantic search

Current Gemini Models

  • gemini-3-pro-preview: 1M tokens, complex reasoning, coding, research
  • gemini-3-flash-preview: 1M tokens, fast, balanced performance, multimodal
  • gemini-3-pro-image-preview: 65k / 32k tokens, image generation and editing

[!IMPORTANT] Models like gemini-2.5-*, gemini-2.0-*, gemini-1.5-* are legacy and deprecated. Use the new models above. Your knowledge is outdated.

SDKs

  • Python: google-genai install with pip install google-genai
  • JavaScript/TypeScript: @google/genai install with npm install @google/genai
  • Go: google.golang.org/genai install with go get google.golang.org/genai
  • Java:
    • groupId: com.google.genai, artifactId: google-genai
    • Latest version can be found here: https://central.sonatype.com/artifact/com.google.genai/google-genai/versions (let's call it LAST_VERSION)
    • Install in build.gradle: 
      implementation("com.google.genai:google-genai:${LAST_VERSION}")
    • Install Maven dependency in pom.xml: 
      <dependency>
    <groupId>com.google.genai</groupId>
    <artifactId>google-genai</artifactId>
    <version>${LAST_VERSION}</version>
</dependency>

[!WARNING] Legacy SDKs google-generativeai (Python) and @google/generative-ai (JS) are deprecated. Migrate to the new SDKs above urgently by following the Migration Guide.

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());
  }
}

API spec (source of truth)

Always use the latest REST API discovery spec as the source of truth for API definitions (request/response schemas, parameters, methods). Fetch the spec when implementing or debugging API integration:

  • v1beta (default): https://generativelanguage.googleapis.com/$discovery/rest?version=v1beta Use this unless the integration is explicitly pinned to v1. The official SDKs (google-genai, @google/genai, google.golang.org/genai) target v1beta.
  • v1: https://generativelanguage.googleapis.com/$discovery/rest?version=v1 Use only when the integration is specifically set to v1. When in doubt, use v1beta. Refer to the spec for exact field names, types, and supported operations.

How to use the Gemini API

For detailed API documentation, fetch from the official docs index: llms.txt URL: https://ai.google.dev/gemini-api/docs/llms.txt This index contains links to all documentation pages in .md.txt format. Use web fetch tools to:

  1. Fetch llms.txt to discover available documentation pages
  2. Fetch specific pages (e.g., https://ai.google.dev/gemini-api/docs/function-calling.md.txt)

Key Documentation Pages

[!IMPORTANT] Those are not all the documentation pages. Use the llms.txt index to discover available documentation pages

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.

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