Alternatives to Harness Sdk

Microsoft's open-source SDK for building production-grade AI agents with plugins, memory, and orchestration.

Google's open-source ADK framework for production-grade AI agents in Python, TypeScript, Go, Java, and Kotlin.

Open-source TypeScript framework for building durable, observable AI agents and workflows.

Pydantic AI: Python SDK for typed, production-grade AI agents with every model a string swap away.

Open-source Python SDK for building multi-agent workflows with handoffs, guardrails, and sandboxing

Microsoft's framework for building production-grade agentic AI on Azure, with Python, C#, and Go SDKs and a GA Agent Harness runtime.

Open-source TypeScript toolkit for building AI apps with 100+ models, streaming, and agent support

Open-source LLM that turns natural language into API calls for tool-using agents

Google's open-source framework for building agentic AI apps in JS, Go, Python & Dart.

Open-source TUI supervises headless Claude Code agents through a gated delivery pipeline

Open-source meta-harness to compose, control, and collaborate on AI agents.

Open-source agentic AI data assistant for SQL, code, and reports

An open-source Python framework that turns ordinary functions into AI-powered tools via simple decorators.

China's leading open-source LLM platform with agentic autonomy and full-stack MaaS APIs.

Open-source multi-agent framework for role-based software engineering

Open AI toolkit for loyal, auditable coding agents.

Open-source framework for building multi-agent AI workflows.

Hugging Face's barebones Python library for AI agents that act by writing code.

Open-source Python library for guaranteed valid structured outputs from LLMs

An open-source Python library for steering LLMs with native control flow, regex, and CFG constraints.

Microsoft's open-source, code-first agent framework for stateful, data-intensive conversational tasks.

Open-source desktop AI agent with autonomous learning loop and deep memory

Open-source AI agent with smart routing that cuts token costs 60-80%.

Run any AI coding agent from anywhere — self-hosted, multi-provider, open source.

Open-source, self-hosted AI agent that plans tasks, runs tools, and evolves memory across 10+ channels.

Open-source AI agent that automates 20+ messaging platforms with persistent memory.

Open-source streaming-first toolkit that turns AI agent output into interactive UI, not JSON.

Compress AI agent context by 60–90% with a local, open-source MCP server.

Open-source Python framework turning messy text into typed, queryable Semantic DataFrames

TypeScript SDK to build AI agents with composable middleware and full control.