Marvin
Prefect's Python framework for structured outputs (cast, classify, extract, generate) and agentic workflows (tasks, agents, threads). Marvin 3.0 merged in ControlFlow's agentic engine, superseding ControlFlow (whose repo was archived 2026-03-19); uses Pydantic AI for LLM providers.
Active · Verified 2026-10-27 · fresh as of 2026-10-27 · 16 cited facts, 1 with a third-party source · 1 recorded change · Suggest a correction
At a glance
- Type
- Functional LLM toolkit (Prefect) vendor fix
- Tier
- T3
- Latest release
- v3.2.7 (2026-03-04) registry fix
- License
- Apache-2.0 vendor fix
- Pricing
- searched not found fix
- Funding
- searched not found fix
- Freshness
- 2026-10-27 fix
- Layer
- agent-infra repo fix
- Licensing
- open-source vendor fix
- Developer activity
- OpenRank 0.65 (12-mo avg 1.12) · 10 participants — 2026-09 third-party fix
When to use
Optimised for: searched not found
Anti-fit: searched not found
Pros & cons
Pros
searched not found
Cons
searched not found
Claims & capabilities
searched not found
Technical surface
- API surface
- searched not found
- Backend storage
- not applicable — not a memory product
- Deployment
- Self-hosted only — library
- Embedding model
- not applicable — not a memory product
- Multi-tenancy
- searched not found
- MCP
- searched not found
- A2A
- searched not found
- OpenTelemetry
- searched not found
Alternatives to Marvin → live options ranked by shared design, licence, hosting and MCP support
Similar systems
Other agent frameworks (no first-party memory layer) in the catalog, ranked by inbound references.
- Model Context Protocol (MCP spec) T1
Anthropic-introduced open protocol (Nov 2024) for connecting LLMs to data sources and tools. Donated by Anthropic to the Linux Foundation's Agentic AI Foundation (announced 2025-12-09); now governed as Model Context Protocol, a Series of LF Projects, LLC. Supported across Claude, ChatGPT, VS Code, Cursor and many other clients.
- LangChain (framework) T1
Dominant Python/JS framework for LLM apps — tool calling, agents, retrievers, runnables. Memory is one component (LangMem cross-listed); the framework itself is the product.
- Vercel AI SDK T1
Vercel's TypeScript LLM SDK — streaming, tool calls, structured outputs, agents. Dominant framework for Next.js LLM apps.
- LlamaIndex (framework) T1
Data framework for LLM apps — connectors, indices, query engines, agents, workflows. Memory is one of many subsystems (LlamaIndex Memory cross-listed).
- OpenAI Agents SDK T1
OpenAI's official Python framework for agents — handoffs, guardrails, tracing built in. Successor to OpenAI Swarm (experimental); officially supported.
- LangGraph (orchestration) T1
LangChain's stateful graph runtime for agents — explicit state, persistence, time-travel debugging, human-in-the-loop. Memory is one persistence target (LangGraph Persistence cross-listed).
Sources (15 cited facts, 1 third-party)
Each fact links to the page it came from; the badge says who published it (how to read sources).
- What it is Functional LLM toolkit (Prefect) vendor
- What it does & what's distinct Prefect's Python framework for structured outputs (cast, classify, extract, generate) an… repo
- Created 2023 vendor
- Latest release v3.2.7 (2026-03-04) registry
- License Apache-2.0 vendor
- GitHub PrefectHQ/marvin — ~6.2k stars, last commit 2026-09 repo
- Deployment Self-hosted only — library repo
- Founders / pedigree Jeremiah Lowin (Prefect CEO); founded 2023 — sub-project of Prefect. vendor
- Runtimes Python registry
- architecture-deployment-locus local repo
- licensing-bucket open-source vendor
- positioning-platform-vs-product platform repo
- taxonomy-three-layer-rollup agent-infra repo
- developer-activity-opendigger {"activity":25.04,"as_of":"2026-09","openrank_12mo":1.12,"openrank_current":0.65,"partic… third-party
- sdk-languages python repo
What changed
Changes to this record's lifecycle, licence, release, pricing and hosting facts, from the catalog's git history. Subscribe (Atom)
Related systems
Referenced by (1)
- LlamaIndex (framework) integrates with — LlamaIndex has an official extractor integration package llama-index-extractors-marvin in its repo. (verified 2026-10-29)