strands-agents/harness-sdk

Build an agent harness and control it end-to-end. Open-source SDK for production AI agents in Python & TypeScript - any model, any cloud.

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Strands Agents is an open-source SDK for building and running AI agents in Python and TypeScript. Choose Strands when you would otherwise write your own agent loop: it runs in your process with no hosted control plane, and it covers the jobs a hand-rolled loop grows into. In one SDK you get lifecycle controls (turn limits, token budgets, cancellation, stop reasons), tools and structured output, MCP, multi-agent patterns, memory and sessions, model portability, streaming, guardrails, tracing, and evals. This monorepo contains Strands harness, the Python and TypeScript SDKs, the documentation site, and supporting packages: Build an agent harness. Control it end-to-end. MCP, streaming, multi-agent patterns, and structured output are all built in. The easiest way to get started is with Strands harness, a fully assembled, state-of-the-art agent. A single createharness() (Python) or createHarness() (TypeScript) call gives you an optimized agent with benchmarked defaults for the model, tools, memory, sessions, and…

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What this repository does

Build an agent harness and control it end-to-end. Open-source SDK for production AI agents in Python & TypeScript - any model, any cloud.

Repository facts

Owner: strands-agents
Primary language: Python
Stars: 7,616
Forks: 1,189
Open issues + pull requests: 804
License: Apache-2.0
Archived: No
Default branch: main
Created: 2025-05-14T19:59:51.000Z
Last push: 2026-09-23T07:58:59.000Z

Topics and intended use

Owner-supplied topics: agent-framework, agentic, agentic-ai, agents, ai, ai-agents, anthropic, autonomous-agents, bedrock, generative-ai, harness, llm, llm-agent, mcp, multi-agent-systems, openai, python, sdk, strands-agents, typescript

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