The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
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.
Install
$
pip install strands-harnessInstall command taken from the project's README or registry entry. Always review code before running it.
README excerpt
Read full README on GitHub →Strands Agents
A model-driven approach to building AI agents in just a few lines of code.
Documentation
◆ Samples
◆ MCP Server
◆ Discord
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.
Using a coding agent? Install the Strands plugin for Claude Code, Codex, or Cursor. It adds framework selection, scaffolding, tool authoring, MCP server connections, web framework guides, and LangGraph migration guidance. See Use Strands with AI coding agents for install and verification steps.
This monorepo contains Strands harness, the Python and TypeScript SDKs, the documentation site, and supporting packages:
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