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What is OpenHarness?

OpenHarness is an open-source SDK built with TypeScript, aimed at developers who wish to craft customized AI-agent applications, including coding assistants, command-line utilities, and web-based supports. This toolkit is equipped with stateless agent execution, explicit management of conversation states, and streaming event support, as well as middleware options for retries, data persistence, and context oversight. Furthermore, it enables the creation of hierarchical subagents and tools governed by permission settings. Developers can seamlessly connect to model providers using the Vercel AI SDK, expand features through the Model Context Protocol (MCP), and employ filesystem or shell tools via adaptable providers. The SDK also provides React hooks and Vue composables, making it easier to integrate streaming agent outputs into diverse application interfaces. OpenHarness is distributed as an npm package and is tailored for projects that operate within Node.js or edge environments, functioning primarily as a developer-oriented library instead of a service intended for end-users. In addition, its design promotes both flexibility and scalability for AI application development, empowering users to customize their solutions to meet specific demands effectively. This adaptability ensures that developers can explore innovative AI applications without being constrained by rigid structures.

What is Mastra?

Mastra is an open-source TypeScript framework designed to help software developers build production-ready AI agents, intelligent applications, and autonomous workflow systems. The framework provides a modular development environment for defining AI agents with configurable instructions, language models, tools, memory, and runtime behavior. Its agent execution capabilities allow applications to process user requests, reason about complex problems, select appropriate tools, and perform actions across connected systems. Mastra's workflow engine enables developers to organize operations into structured steps with branching logic, retries, error handling, and persistent execution state. Human-in-the-loop functionality allows workflows to pause for user input or approval and resume execution without losing their previous progress. Its memory system supports conversation history, structured working memory, semantic retrieval, and observational memory that summarizes previous interactions to maintain useful context. The platform also provides an agent harness for coordinating long-running agents with multiple operating modes, shared state, persistent threads, and task management capabilities. Model integration features enable developers to work with different AI providers through a unified router, while Model Context Protocol support connects agents to external tools, resources, and compatible applications. Built-in observability includes distributed tracing, execution logs, latency measurements, token usage monitoring, cost tracking, and detailed visibility into model calls and tool interactions. Its evaluation framework supports automated scoring, test datasets, experiments, feedback collection, and regression testing to help development teams measure and improve agent performance.

Media

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Media

Integrations Supported

Model Context Protocol (MCP)
OpenAI
Anthropic
Vercel AI SDK

Integrations Supported

Model Context Protocol (MCP)
OpenAI
AG-UI
Apify
Cerebras
Claude
Claude Duet
Dock
Ejentum
EmpirioLabs AI
GPT-4
Groq
Keenable
Mistral AI
OpenUI
Prefactor
SerpKite
TypeScript

API Availability

Has API

API Availability

Pricing Information

Pricing not provided

Pricing Information

Free
Open source
Free Version

Supported Platforms

Not specified

Supported Platforms

SaaS
Windows
Mac
On-Prem
Linux

Customer Service / Support

Not specified

Customer Service / Support

Not specified

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

OpenHarness

Company Website

open-harness.dev/

Company Facts

Organization Name

Mastra AI

Date Founded

2024

Company Location

United States

Company Website

mastra.ai/

Categories and Features

AI Agent Frameworks

Not specified

Categories and Features

Agentic AI

Not specified

AI Agent Builders

Not specified

AI Agent Frameworks

Not specified

AI Agents

Not specified

AI Orchestration

Not specified

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