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What is Agent Builder?

Agent Builder is a key element of OpenAI’s toolkit aimed at developing agentic applications, which utilize large language models to autonomously perform complex tasks while integrating elements such as governance, tool connectivity, memory, orchestration, and observability features. This platform offers a versatile array of components—including models, tools, memory/state, guardrails, and workflow orchestration—that developers can assemble to create agents capable of discerning the right times to use a tool, execute actions, or pause and hand over control. Moreover, OpenAI has rolled out a new Responses API that combines chat functionalities with tool integration, along with an Agents SDK available in Python and JS/TS that streamlines the control loop, enforces guardrails (validations on inputs and outputs), manages the transitions between agents, supervises session management, and logs agent activities. In addition, these agents can be augmented with a variety of built-in tools, such as web searching, file searching, or computational tasks, along with custom function-calling tools, thus enabling a wide spectrum of operational capabilities. As a result, this extensive ecosystem equips developers with the tools necessary to create advanced applications that can effectively adjust and respond to user demands with exceptional efficiency, ensuring a seamless experience in various scenarios. The potential applications of this technology are vast, paving the way for innovative solutions across numerous industries.

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

Media

Integrations Supported

JavaScript
Model Context Protocol (MCP)
OpenAI
TypeScript
PydanticAI
Zapier

Integrations Supported

JavaScript
Model Context Protocol (MCP)
OpenAI
TypeScript
AG-UI
Alkemi
Cerebras
Claude Duet
Claude for Legal
Dock
GPT-4
GPT-4o
Gemini Enterprise
Groq
Llama
Mistral AI
OpenUI
Span-01

API Availability

Has API

API Availability

Pricing Information

Pricing not provided

Pricing Information

Free
Open source
Free Version

Supported Platforms

SaaS

Supported Platforms

SaaS
Windows
Mac
On-Prem
Linux

Customer Service / Support

Standard Support
Web-Based Support

Customer Service / Support

Not specified

Training Options

Documentation Hub
Online Training
On-Site Training

Training Options

Documentation Hub

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

platform.openai.com/docs/guides/agent-builder

Company Facts

Organization Name

Mastra AI

Date Founded

2024

Company Location

United States

Company Website

mastra.ai/

Categories and Features

AI Agent Builders

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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