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Marvin

Open-source Python framework for structured outputs and agentic AI workflows

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PricingFree
Starting price$0
Free planYes
Free trialYes
APIYes
Open sourceYes
DeploymentDesktop
Last verifiedAugust 3, 2026
Overview

Tool overview

Marvin is listed under Programming AI tools.

Summary

What is Marvin?

Marvin is an Apache-2.0 Python framework for building AI applications. It supports structured outputs, tasks, agents, threads, tools, memory, model-provider configuration, and MCP servers through a concise interface.

Best fit

Best for

Python developers building typed AI functions, agents, and structured workflows

Audience

Who is it for?

Python developersAI application engineersData teamsAutomation engineers
Recommendation

Decision note

Rebuilt from the original export under the complete V411 factual-source gate. Each tool was researched independently and every high-risk family was checked again in a second pass. Preview only. Apply remains blocked until failures = 0, warnings = 0, unmapped = 0, missing = 0, logo QA is accepted or image import is disabled, explicit clears are reviewed, and a representative WordPress edit screen is checked.

Capabilities

Key features

Typed structured output generation

Tasks, agents, threads, and memory

Tool and MCP server integration

Model access through Pydantic AI

Workflows

Use cases

Extract structured data from text

Build multi-step agent workflows

Classify and transform application data

Connect AI tasks to MCP tools

Strengths

Pros

  • Concise Python-native interface
  • Open source under Apache-2.0
  • Works with Pydantic AI model providers
Considerations

Limitations

Developers must validate generated structures, tool permissions, retries, and provider behavior before production use

The framework does not remove security, evaluation, or observability requirements

Cost

Pricing details

Pricing modelFree
Starting price$0
Free planYes
Free trialYes
Pricing context

Billing options

Free open sourceModel-provider usage
Pricing context

Pricing note

Marvin is free under Apache-2.0. Users pay for model-provider usage, hosting, storage, observability, and connected services.

View official pricing
Compatibility

Supported programming languages

  • English
Connectivity

Integrations

Pydantic AI

OpenAI

Anthropic

Google

MCP

Specs

Technical details

PlatformsWeb
Multilingual supportUnknown
Login requiredNo
Open sourceYes
LicenseApache-2.0
DeploymentDesktop
CompanyPrefect Technologies, Inc. and contributors
Models / versionsAI Functions Tasks Agents Threads
Editions / plansPython package CLI Agent framework
Data confidenceHigh
Last verifiedAugust 3, 2026
Documentation → Source code → Release notes → Data source →
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Answers

Frequently asked questions

Marvin is an Apache-2.0 Python framework for building AI applications. It supports structured outputs, tasks, agents, threads, tools, memory, model-provider configuration, and MCP servers through a concise interface.
Python developers building typed AI functions, agents, and structured workflows
The listed pricing model for Marvin is Free. Pricing can change, so users should verify the latest plan details on the official website.
Yes. The current profile indicates that a free trial is available.
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