A guide for using Google's Gemini models through Vertex AI with the Google Gen AI SDK. Vertex AI is Google's cloud platform for enterprise machine-learning services, and the SDK is the programming library used to call it.

Use it when building Gemini applications in Python, JavaScript or TypeScript, Go, Java, or C#. It covers tasks such as chat, document or media understanding, tool calls, embeddings, real-time voice or video, and large asynchronous workloads.

It helps developers choose the supported SDK and apply the documented patterns for text, media, function calls, structured JSON, caching, live connections, and batch jobs.

genai-sdk — Skill for Claude Code and Codex by GoogleCloudPlatform

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add GoogleCloudPlatform/vertex-ai-samples --skill genai-sdk

Clone the repo

git clone --depth 1 https://github.com/GoogleCloudPlatform/vertex-ai-samples

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

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Your own site

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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/googlecloudplatform/vertex-ai-samples/genai-sdk"><img src="https://agentmods.dev/badge/skills/googlecloudplatform/vertex-ai-samples/genai-sdk.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 73 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,240 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00073	$0.02240
Opus 5.5	$0.00029	$0.00896
Sonnet 5.5	$0.00015	$0.00448
Haiku 4.5	$0.00007	$0.00224

Measured 1mo ago against content hash 9ee27b105f06, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

genai-sdk scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/genai-sdk/SKILL.md · 226 lines

How it starts

The opening of the file, as written. The whole thing — 226 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Gemini API in Vertex AI

Access Google's most advanced AI models built for enterprise use cases using the Gemini API in Vertex AI.

Provide these key capabilities:

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
Context caching - Cache large contexts for efficiency
Embeddings - Generate text embeddings for semantic search
Live Realtime API - Bidirectional streaming for low latency Voice and Video interactions
Batch Prediction - Handle massive async dataset prediction workloads

Core Directives

Unified SDK: ALWAYS use the Gen AI SDK (google-genai for Python, @google/genai for JS/TS, google.golang.org/genai for Go, com.google.genai:google-genai for Java, Google.GenAI for C#).
Legacy SDKs: DO NOT use google-cloud-aiplatform, @google-cloud/vertexai, or google-generativeai.

SDKs

Python: Install google-genai with pip install google-genai
JavaScript/TypeScript: Install @google/genai with npm install @google/genai
Go: Install google.golang.org/genai with go get google.golang.org/genai
C#/.NET: Install Google.GenAI with dotnet add package Google.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 like google-cloud-aiplatform, @google-cloud/vertexai, and google-generativeai are deprecated. Migrate to the new SDKs above urgently by following the Migration Guide.

Read the full file on GitHub · 226 lines

Files

What ships with it

13 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 226 lines · 73 tokens per session scan A 9ee27b105f06

Subscribe to this mod's changes

genai-sdk is a skill published in the GitHub repository GoogleCloudPlatform/vertex-ai-samples (791 stars, last pushed 3d ago), licensed Apache-2.0. It adds 73 tokens to every session and 2,240 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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