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Marvin

Python framework for structured LLM outputs and agentic workflows built from tasks, agents and threads.

Harness by Prefect

IndexedApache-2.0★ 6,207
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Install

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pip install marvin

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About

Marvin casts, classifies, extracts and generates structured data from unstructured input. Work is defined as tasks, each of which can be assigned to one or more agents, and tasks can be combined into threads for larger loops. The default model provider is OpenAI, and the README says Marvin also supports all Pydantic AI models. The 3.0 agentic API is described as ported from ControlFlow.

Use cases: agent-orchestration, data-pipelines

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Fact sheet

Languages
PythonREADME
Packages
marvin (pypi)README
Multi-agent
YesREADME
Orchestration
otherREADME
Memory
short-termaskmarvin.ai
Model providers
openaiREADME
Maturity
StableREADME

Facts extracted by Claude Haiku 5.5 from the linked sources on Oct 24, 2026. Wrong fact? Tell us.

Alternatives

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Signals

Stars
6,207
Forks
414
Open issues
66
Weekly downloads
61,775
Last commit
Sep 23, 2026 (1 month ago)
Last release
Mar 4, 2026 (8 months ago)
Last package publish
Mar 4, 2026 (8 months ago)

From GitHub (fetched Oct 24, 2026) and the package registry.

Details

Packages
pypi marvin
License
Apache-2.0
First seen
Oct 24, 2026
Last checked
Oct 24, 2026

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Cite this page

Marvin. Agent Mart. https://agentmart.dev/harnesses/marvin (last updated 2026-10-24)