Adk Agent Builder

google/adk-agent-builder

Central hub for building, testing, and iterating on ADK agents. Trigger this skill when the user wants to create a new agent, configure modes (task, single-turn), or build graph-based workflows.

33k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

20998

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/google/adk-python --skill adk-agent-builder

What comes with it

128 959 bytes besides the instruction

references/advanced-patterns.md

references/best-practices.md

references/callbacks-and-plugins.md

references/dynamic-nodes.md

references/function-nodes.md

references/getting-started.md

references/human-in-the-loop.md

references/import-paths.md

references/llm-agent-nodes.md

references/multi-agent.md

references/parallel-and-fanout.md

references/routing-and-conditions.md

references/session-and-state.md

references/state-and-events.md

references/task-mode.md

references/testing.md

references/tool-catalog.md

The instruction itself

6 sections, as written by the author

ADK Agent Builder

This file serves as a directory of specialized reference guides for developing

agents with ADK. To avoid context pollution, read only the relevant reference

file based on your current task.

Core Concepts Directory

Refer to these files for foundational knowledge:

Getting Started & Basic Agents: getting-started.md
Environment setup, API key configuration, and minimal agent definitions.
Tool Catalog: tool-catalog.md
How to bind function tools, MCP tools, OpenAPI specs, and Google API tools.
Agent Modes (Task / Single-Turn): task-mode.md
Multi-turn structured delegation and autonomous single-turn execution patterns.
Import Paths: import-paths.md
Canonical and verbose import paths for core components, tools, and

events.

Workflow & Graph Orchestration

Refer to these files when building complex graphs:

Function Nodes: function-nodes.md
How to use functions as nodes, type resolution, and generators.
Routing & Conditions: routing-and-conditions.md
Edge patterns, dict-based routing, self-loops, and conditional execution.
LLM Agent Nodes: llm-agent-nodes.md
How to use LLM agents as workflow nodes, task wrappers, and handling output schemas.
Advanced Patterns:

advanced-patterns.md

Nested workflows, custom node types, and graph validation rules.

Advanced Orchestration Patterns

Parallel Processing & Fan-Out: parallel-and-fanout.md
ParallelWorker for list splitting and concurrent processing, fan-out/join patterns.
Human-in-the-Loop: human-in-the-loop.md
Pausing execution for user input, resumable workflows, and AuthConfig on nodes.
Dynamic Nodes: dynamic-nodes.md
Scheduling nodes at runtime dynamically via ctx.run_node().

Infrastructure & Utilities

State & Events: state-and-events.md
Using context API, sharing global state, and yield event structures.
Session & Memory:

session-and-state.md

Session state mutation, scope conventions, and database session

services.

Callbacks & Plugins:

callbacks-and-plugins.md

Implementing callbacks, plugin manager integration, and override

behavior.

Multi-Agent Systems: multi-agent.md
Hierarchical execution (e.g., SequentialAgent, LoopAgent, ParallelAgent).
Testing Strategies: testing.md
Automated queries with adk run, unit tests, and integration testing with sample agents.

Standards & Guidelines

Best Practices: best-practices.md
Critical rules (Pydantic schemas, content events, state-based data flow).

How to use it

Copy the folder

Take google/adk-agent-builder from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.