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adk-java: Instructions file for Gemini CLI

GEMINI.md

adk-java GEMINI.md is an instructions file for Gemini CLI from google/adk-java. It costs 1,249 tokens per session, scanned A, original, Apache-2.0.

Project guidance for Google's Agent Development Kit for Java, a code toolkit for building and running AI agents. It covers the multi-module Maven project and its development commands.

In plain words
What is it for?
Use it when working on the ADK's agent classes, sessions, tools, sub-agents, Maven modules, or local development tasks.
Why use it?
It gives a coding agent the project's structure and workflow, reducing mistakes when building, testing, or changing the Java code.

Instructions file for Gemini CLI ✓ vendor

Written for Gemini CLI: the file is GEMINI.md. Also seen: mentions subagents.

This is google/adk-java's own configuration. It tells Gemini CLI how to work on adk-java itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything adk-java configures →

not rated 1.8krepo +6 yesterday A scan 1,249 tokens original Apache-2.0
View source ↗ google/adk-java google.github.io
About the project

ADK for Java is a code-first Java toolkit for building, evaluating, and deploying AI agents, including systems made from multiple cooperating agents and tools. Java developers use it to define agent behavior and orchestration in code, from local development through cloud deployment. The catalogue provides skills and instructions for working with the toolkit.

google/adk-java · 1,765 stars · on GitHub · google.github.io

Reuse

Borrowing it

Nothing to install: this file belongs to google/adk-java. 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/google/adk-java/main/GEMINI.md
Clone the repo
git clone --depth 1 https://github.com/google/adk-java

Made for: Gemini CLI.

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.

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Per session 1,249 This file is loaded in full into every session.
When invoked 1,249 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01249 $0.01249
Opus 5.5 $0.00500 $0.00500
Sonnet 5.5 $0.00250 $0.00250
Haiku 4.5 $0.00125 $0.00125

Measured 2mo ago against content hash f8a1b402b1f7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

adk-java GEMINI.md 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 2mo 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.

GEMINI.md · 98 lines

How it starts

The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Gemini Code Assistant Context

This document provides context for the Gemini Code Assistant to understand the "Agent Development Kit (ADK) for Java" project.

Project Overview

The "Agent Development Kit (ADK) for Java" is an open-source, code-first toolkit for building, evaluating, and deploying sophisticated AI agents with flexibility and control. It allows developers to define agent behavior, orchestration, and tool use directly in Java code, enabling robust debugging, versioning, and deployment.

The project is a multi-module Maven project with the following key modules:

  • core: The core module contains the main logic of the ADK. It includes the following key components:

    • BaseAgent: The abstract base class for all agents. It defines the basic properties of an agent, such as its name, description, and sub-agents. It also defines the runAsync() and runLive() methods, which are the entry points for running an agent.
    • LlmAgent: The primary implementation of a BaseAgent. It can be configured with a model, instructions, tools, and sub-agents.
    • BaseSessionService: An interface for managing sessions. It provides methods for creating, retrieving, listing, and deleting sessions, as well as listing and appending events to a session.
    • Runner: The main class for running agents. It takes a BaseAgent, a BaseArtifactService, a BaseSessionService, and a BaseMemoryService as input. It provides runAsync() and runLive() methods for running the agent.
    • Core Runtime: The core runtime of the ADK is responsible for orchestrating the execution of agents. It uses the Runner to run the agent and the BaseSessionService to manage the session.

  • dev: This module contains the development UI for testing, evaluating, and debugging agents. It includes a Spring Boot-based web server that can be used to debug agents developed using ADK.

    Agent Loading:

    The dev module provides a flexible mechanism for loading agents into the ADK Web Server through the AgentLoader interface. This interface has two implementations:

Read the full file on GitHub · 98 lines

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.

  1. 2mo ago First seen · 98 lines · 1,249 tokens per session scan A f8a1b402b1f7

Subscribe to this mod's changes

adk-java GEMINI.md is an instructions file published in the GitHub repository google/adk-java (1,765 stars, last pushed yesterday), licensed Apache-2.0. It adds 1,249 tokens to every session, about $0.0050 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.

Building agentsJavaLanguagesMulti-Agentagentagentsaiai-agentsmulti-agent-systems
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