A usage guide for Google's Gemini API through Agent Platform, Google's enterprise service for running AI models. It covers the Google Gen AI SDK for several programming languages and explains text, media, function calling, JSON output, embeddings, live sessions, and batch jobs.

Use it to build Gemini features in Python, JavaScript or TypeScript, Go, Java, or C#, including chat, image or video understanding, tool calls, structured JSON, semantic search, real-time voice or video, and batch processing.

It helps developers choose the supported SDK and approach when adding Gemini to a Google Cloud application. It also explains which older SDKs to avoid.

How tutur3u/platform configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to tutur3u/platform. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/tutur3u/platform/main/.agents/skills/gemini-api/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/tutur3u/platform

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

[![agentmods](https://agentmods.dev/badge/skills/tutur3u/platform/gemini-api/github.svg)](https://agentmods.dev/skills/tutur3u/platform/gemini-api)

Your own site

<a href="https://agentmods.dev/skills/tutur3u/platform/gemini-api"><img src="https://agentmods.dev/badge/skills/tutur3u/platform/gemini-api/github.svg" alt="Measured on agentmods" height="20"></a>

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/tutur3u/platform/gemini-api"><img src="https://agentmods.dev/badge/skills/tutur3u/platform/gemini-api.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,262 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.

Origin 94% copy Near-identical to another mod 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	$0.00020	$0.02262
Opus 5.5	$0.00008	$0.00905
Sonnet 5.5	$0.00004	$0.00452
Haiku 4.5	$0.00002	$0.00226

Measured 1mo ago against content hash 5ba1d2ee49f2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gemini-api 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.

Origin

This is a copy

94% identical to gemini-api-agent-platform — 5 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/gemini-api/SKILL.md · 231 lines

How it starts

The opening of the file, as written. The whole thing — 231 lines — stays where its author put it; the contents beside it link to each section on GitHub.

IMPORTANT: Agent Platform (full name Gemini Enterprise Agent Platform) was previously named "Vertex AI" and many web resources use the legacy branding.

Gemini API in Agent Platform

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

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>
```

Read the full file on GitHub · 231 lines

Files

What ships with it

9 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 Changed · -60 tokens per session 5ba1d2ee49f2
1mo ago First seen · 231 lines · 80 tokens per session scan A 9933d528b060

Subscribe to this mod's changes

gemini-api is a skill published in the GitHub repository tutur3u/platform (55 stars, last pushed today), licensed Apache-2.0. It adds 20 tokens to every session and 2,262 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 94% identical to gemini-api-agent-platform, differing in 5 lines, and is treated as a copy.

Backend and APIs Languages TypeScript nextjs tailwindcss

client-setup

Create a vanilla tRPC client with createTRPCClient (), configure link chain with httpBatchLink/httpLink, dynamic headers for auth, transformer on links (not client constructor). Infer types with inferRouterInputs and inferRouterOutputs. AbortController signal support. TRPCClientError typing.

trpc/trpc · 63 tokens

adapter-express

Mount tRPC as Express middleware with createExpressMiddleware() from @trpc/server/adapters/express. Access Express req/res in createContext via CreateExpressContextOptions. Mount at a path prefix like app.use('/trpc', ...). Avoid global express.json() conflicting with tRPC body parsing for FormData.

trpc/trpc · 67 tokens

trpc-router

Entry point for all tRPC skills. Decision tree routing by task: initTRPC.create(), t.router(), t.procedure, createTRPCClient, adapters, subscriptions, React Query, Next.js, links, middleware, validators, error handling, caching, FormData.

trpc/trpc · 59 tokens

rpc

Vovk.ts RPC client — how vovk generate turns controllers into type-safe client modules, composed vs segmented clients, call shape (apiRoot, params, body, query, meta, init, disableClientValidation, validateOnClient, interpretAs, transform, fetcher), customizing generation via outputConfig.imports.fetcher +…

finom/vovk · 347 tokens

base

Vovk.ts essentials — ALWAYS load first for any Vovk.ts task, including building a back end or API in a project that has vovk.config. or .vovk-schema/. Holds what a typical build needs, checked against vovk 4's code - project layout, a complete endpoint, how requests, validation and errors behave, status codes, a…

finom/vovk · 123 tokens

decorators

Vovk.ts decorators — built-in (@prefix, @operation, @get/@post/@put/@patch/@del, .auto()) and custom via createDecorator. Covers authorization / auth decorators, middleware-style wrapping (pre-handler + post-handler logic), req.vovk.meta() for cross-decorator state, stacking order, and the local (.fn()) vs HTTP…

finom/vovk · 207 tokens

platform: Skill for Claude Code