Pocket Flow is a 100-line minimalist LLM framework

• Lightweight: Just 100 lines. Zero bloat, zero dependencies, zero vendor lock-in.

• Expressive: Everything you love—(Multi-)Agents, Workflow, RAG, and more.

• Agentic Coding: Let AI Agents (e.g., Cursor AI) build Agents—10x productivity boost!

• To install, pip install pocketflowor just copy the source code (only 100 lines).

• To learn more, check out the documentation. For an in-depth design dive, read the essay.

• 🎉 We now have a discord!

Why Pocket Flow?

Current LLM frameworks are bloated... You only need 100 lines for LLM Framework!

	Abstraction	App-Specific Wrappers	Vendor-Specific Wrappers	Lines	Size
LangChain	Agent, Chain	Many (e.g., QA, Summarization)	Many (e.g., OpenAI, Pinecone, etc.)	405K	+166MB
CrewAI	Agent, Chain	Many (e.g., FileReadTool, SerperDevTool)	Many (e.g., OpenAI, Anthropic, Pinecone, etc.)	18K	+173MB
SmolAgent	Agent	Some (e.g., CodeAgent, VisitWebTool)	Some (e.g., DuckDuckGo, Hugging Face, etc.)	8K	+198MB
LangGraph	Agent, Graph	Some (e.g., Semantic Search)	Some (e.g., PostgresStore, SqliteSaver, etc.)	37K	+51MB
AutoGen	Agent	Some (e.g., Tool Agent, Chat Agent)	Many [Optional] (e.g., OpenAI, Pinecone, etc.)	7K (core-only)	+26MB (core-only)
PocketFlow	Graph	None	None	100	+56KB

Pocket Flow is also a educational resource for understanding LLM frameworks:

• Larger frameworks are overly abstract and hide away details.

• Pocket Flow shows exactly how everything works under the hood.

How to Use Pocket Flow?

🚀 Through Agent Coding—the fastest LLM App development paradigm-where humans design and agents code!

✨ Below are examples of LLM Apps:

App Name	Difficulty	Topics	Human Design	Agent Code
Ask AI Paul Graham Ask AI Paul Graham, in case you don't get in	★★☆ Medium	RAG Map Reduce TTS	Design Doc	Flow Code
Youtube Summarizer Explain YouTube Videos to you like you're 5	★☆☆ Beginner	Map Reduce	Design Doc	Flow Code
Cold Opener Generator Instant icebreakers that turn cold leads hot	★☆☆ Beginner	Map Reduce Web Search	Design Doc	Flow Code

• Want to learn Agent Coding? Check out my YouTube! Read this Guide!

• Want to build your own LLM App? Start with this template!

How does Pocket Flow work?

The 100 lines capture the core abstraction of LLM frameworks: Graph!

From there, it’s easy to implement popular design patterns like (Multi-)Agents, Workflow, RAG, etc.