PydanticAI

PydanticAI

Pydantic
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About

OpenHarness is an open-source TypeScript SDK for developers building custom AI-agent applications, including coding agents, CLI tools, and web-based assistants. It provides stateless agent execution, explicit conversation-state handling, streaming events, composable middleware for retries, persistence and context compaction, hierarchical subagents, and permission-controlled tools. Developers can connect model providers through the Vercel AI SDK, add external capabilities through Model Context Protocol (MCP), and use filesystem or shell tools through configurable providers. The SDK also offers React hooks and Vue composables for streaming agent output into application interfaces. OpenHarness is installed as an npm package and is intended to be embedded in projects running on Node.js or edge runtimes; it is a developer library rather than a hosted end-user agent service.

About

PydanticAI is a Python-based agent framework designed to simplify the development of production-grade applications using generative AI. Built by the team behind Pydantic, the framework integrates seamlessly with popular AI models such as OpenAI, Anthropic, Gemini, and others. It offers type-safe design, real-time debugging, and performance monitoring through Pydantic Logfire. PydanticAI also provides structured responses by leveraging Pydantic to validate model outputs, ensuring consistency. The framework includes a dependency injection system to support iterative development and testing, as well as the ability to stream LLM outputs for rapid validation. It is ideal for AI-driven projects that require flexible and efficient agent composition using standard Python best practices. We built PydanticAI with one simple aim: to bring that FastAPI feeling to GenAI app development.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Not Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Software developers and engineering teams building custom AI-agent applications, including coding agents, CLI tools, and web assistants.

Audience

Python developers in search of a solution to build AI-powered applications

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Pricing

Free
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

OpenHarness
open-harness.dev/

Company Information

Pydantic
United States
ai.pydantic.dev/

Alternatives

Deep Agents

Deep Agents

LangChain

Alternatives

Okyline

Okyline

Akwatype
Mastra

Mastra

Mastra AI
eve

eve

Vercel

Categories

Categories

Agentic AI Supported
AI Agent Builders Supported

Integrations

OpenAI Supported
AG-UI Not Supported
Agent Builder Not Supported
Anthropic Supported
Claude Not Supported
Claude for Legal Not Supported
Ejentum Not Supported
Gemini Not Supported
Gemini 1.5 Pro Not Supported
Gemini 2.0 Not Supported
Gemini 2.0 Flash Not Supported
Gemini Enterprise Not Supported
Gemini Nano Not Supported
Gemini Pro Not Supported
Hindsight Not Supported
Instructor Not Supported
Lucidic AI Not Supported
Prefactor Not Supported
Python Not Supported
telemetry.dev Not Supported

Integrations

OpenAI Supported
AG-UI Supported
Agent Builder Supported
Anthropic Not Supported
Claude Supported
Claude for Legal Supported
Ejentum Supported
Gemini Supported
Gemini 1.5 Pro Supported
Gemini 2.0 Supported
Gemini 2.0 Flash Supported
Gemini Enterprise Supported
Gemini Nano Supported
Gemini Pro Supported
Hindsight Supported
Instructor Supported
Lucidic AI Supported
Prefactor Supported
Python Supported
telemetry.dev Supported
Claim OpenHarness and update features and information
Claim OpenHarness and update features and information
Claim PydanticAI and update features and information
Claim PydanticAI and update features and information