This skill should be used when the user wants to "write agent code", "build an agent with ADK", "add a tool", "create a callback", "define an agent", "use state management", or needs ADK (Agent Development Kit) Python API patterns and code examples. Part of the Google ADK skills suite. It provides a

ADK Code Reference Activate /google agents cli workflow first for required development phases and scaffolding steps. 1. Study Recipes (No Project Needed) Read the topic index in references/samples.md before answering "how do I build X". Worked implementations exist for: sandboxed/per user code execution, agent loadable SKILL.md skills, cross session memory, approval gates before risky actions, tool guardrails, per user credentials, and scheduled/event driven runs. The index only gives you a name; the recipe is the code. Clone it and read its AGENTS.md before you implement anything it covers. Hand writing a Docker or E2B sandbox wrapper, a skill loader, a moderation callback or a memory store — for a capability the index lists — means you stopped at the name. 2. Prerequisites for Writing Code Do NOT write agent code until a project is scaffolded. 1. Verify project: run agents cli info (proceed if config exists). 2. New project: run agents cli scaffold create <name . 3. Existing code: run agents cli scaffold enhance . . Language Support: This reference covers the Python ADK SDK. Support for other languages coming soon. Quick Reference — Most Common Patterns References Use cheatsheets for common patterns. For deep knowledge, fetch the docs index or inspect the installed package. Reference When to read references/samples.md Topic indexed catalog of ADK reference recipes. Read in workflow Phase 1 — before scaffolding and before writing code — maps a capability to the recipe that implements it. references/adk python.md Core ADK API: Agent , tools, callbacks, plugins, state, artifacts, multi agent systems, SequentialAgent / ParallelAgent / LoopAgent , custom BaseAgent , ManagedAgent (server hosted first party agents), A2A protocol, A2UI. Default for most agents. references/adk workflows.md Graph based Workflow API (ADK 2.0): nodes, edges, fan out/fan in, HITL, parallel processing. Use when you need explicit graph topology. curl https://adk.dev/llms.txt Docs index (every page title + URL). Fetch it, then WebFetch the specific page for anything beyond the cheatsheets. Installed ADK package Exact signatures and symbols — inspect the source (see "Inspecting ADK Source Code" in references/adk python.md ). Related Skills /google agents cli workflow — Development workflow, coding guidelines, and operational rules /google agents cli scaffold — Project creation and enhancement with agents cli scaffold create / scaffold enhance /google agents cli eval — Evaluation methodology, dataset schema, and the eval fix loop /google agents cli deploy — Deployment targets, CI/CD pipelines, and production workflows

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