gemini-api-dev

SKILL.md

Gemini API Development Skill

Critical Rules (Always Apply)

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 Your knowledge is outdated.

Current Models (Use These)

gemini-3.7-flash: 1M tokens, fast, balanced performance for agentic and multimodal tasks

gemini-3.5-flash-lite: 1M tokens, fastest, lowest-cost 3.5 model for high-throughput execution

gemini-3.1-pro-preview: 1M tokens, complex reasoning, coding, research

gemini-3-pro-image-preview (Nano Banana Pro): 65k / 32k tokens, image generation and editing

gemini-3.1-flash-image-preview (Nano Banana 2): 65k / 32k tokens, image generation and editing

gemini-3.1-flash-lite-image-preview (Nano Banana 2 Lite): 65k / 32k tokens, ultra-fast image generation and editing

gemini-2.5-pro: 1M tokens, complex reasoning, coding, research

gemini-2.5-flash: 1M tokens, fast, balanced performance, multimodal

gemma-4-31b-it: Gemma 4 dense model, 31B parameters

gemma-4-26b-a4b-it: Gemma 4 MoE model, 26B total with 4B active parameters

gemini-embedding-2: Multimodal embedding model (text, images, video, audio, documents), uses client.models.embed_content

gemini-embedding-001: Text-only embedding model, uses client.models.embed_content

[!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-3.7-flash",
    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-3.7-flash",
  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-3.7-flash", 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-3.7-flash",
            "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_docs tool (from the Google MCP server) is available, use it as your only documentation source:

Call search_docs with your query

Read the returned documentation

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

This index contains links to all documentation pages in .md.txt format. Use web fetch tools to:

Fetch llms.txt to discover available pages

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.