Google Agent Development Kit (ADK)

Open-source toolkit for building, evaluating and deploying agents in Python, TypeScript, Go, Java and Kotlin, tuned for Gemini but model-agnostic.

Harness by Google

IndexedApache-2.0★ 21,990

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pip install google-adk

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About

Agent Development Kit (ADK) is a code-first framework for building agent workflows, with a graph-based workflow runtime and a task API for delegating between agents. Agents can be composed into hierarchies and given built-in tools, custom functions, OpenAPI specs or MCP tools. A tool confirmation flow lets a human approve tool execution. Agents can be containerized for Cloud Run or run on Vertex AI Agent Engine.

Use cases: agent-orchestration, llm-evaluation

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Fact sheet

Languages: Python, TypeScript, Go, Java, Kotlinadk.dev
Packages: google-adk (pypi)README
Multi-agent: YesREADME
Orchestration: graphREADME
MCP support: Built inREADME
Human in the loop: YesREADME
Deploys to: cloud-run, vertex-ai-agent-engineREADME
Model providers: google, anthropic, openai, ollamaadk.dev
Maturity: StableREADME

Facts extracted by Claude Sonnet 5.5 from the linked sources on Oct 24, 2026; reviewed Oct 24, 2026. Wrong fact? Tell us.

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Signals

Stars: 21,990
Forks: 4,229
Open issues: 191
Weekly downloads: 2,355,953
Last commit: Oct 24, 2026 (3 days ago)
Last release: Oct 23, 2026 (3 days ago)
Last package publish: Oct 23, 2026 (3 days ago)

From GitHub (fetched Oct 24, 2026) and the package registry.

Details

Packages: pypi google-adk
License: Apache-2.0
Repository: github.com/google/adk-python
Website: google.github.io/adk-docs/
Docs: google.github.io/adk-docs/
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: README Website Docs github-graphql

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Cite this page

Google Agent Development Kit (ADK). Agent Mart. https://agentmart.dev/harnesses/google-agent-development-kit-adk (last updated 2026-10-24)