LangChain Tool Building LLM Tools

Frameworks, libraries, and tutorials for creating custom tools and tool-calling systems in LangChain. Includes tool wrappers, agent toolkits, and structured tool implementations. Does NOT include applications built with tools, broader agent frameworks beyond tool-calling, or LangChain integrations not focused on tool development.

There are 73 langchain tool building tools tracked. 6 score above 50 (established tier). The highest-rated is tryAGI/LangChain at 68/100 with 992 stars. 1 of the top 10 are actively maintained.

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#	Tool	Score	Tier	Stars	Language
1	tryAGI/LangChain C# implementation of LangChain. We try to be as close to the original as...	68	Established	992	C#
2	UiPath/uipath-langchain-python Python SDK that enables developers to build and deploy LangGraph agents to...	64	Established	67	Python
3	msoedov/langcorn ⛓️ Serving LangChain LLM apps and agents automagically with FastApi. LLMops	52	Established	940	Python
4	BrandPeng/Langchain1.0-Langgraph1.0-Learning 这是一个 LangChain 1.0 和 LangGraph 1.0 的学习仓库，学习如何进行agent开发，涵盖从基础概念到实战项目的完整学习路径。	51	Established	220	Python
5	leonyangdev/lc-studylab LC-StudyLab 是一个完整演示 LangChain v1.0 全家桶能力的开源项目，整合了 LangGraph、DeepAgents、RAG...	50	Established	283	Python
6	Shikenso-Analytics/langchain-taiga Python toolkit that lets your LangChain agents automate Taiga: create,...	50	Established	3	Python
7	withoneai/pica-langchain Python SDK for LangChain	48	Emerging	7	Python
8	e7217/langchain-naver-community 🚀 Community-driven Naver integrations for LangChain! Seamlessly connect...	47	Emerging	5	Python
9	sardanaaman/langgraph-compass Intelligent follow-up question generation for conversational LangGraph agents	46	Emerging	15	Python
10	li2109/langtorch 🔥 Building composable LLM applications & workflow with Java.	44	Emerging	308	Java
11	AttackIQ/SigmAIQ A pySigma wrapper and langchain toolkit for automatic rule creation/translation	44	Emerging	92	Python
12	jina-ai/agentchain Chain together LLMs for reasoning & orchestrate multiple large models for...	43	Emerging	610	Python
13	huangjia2019/langchain-in-action Practical LangChain patterns and implementations for real-world LLM...	43	Emerging	743	Python
14	xukecheng/APITable-LLMs-Enhancement-Experiments This is a test version of the agent_toolkit in langchain. Please do not use...	41	Emerging	10	Jupyter Notebook
15	jbpayton/langchain-stock-screener LangChain agent usable tool to screen stock data	40	Emerging	44	Python
16	microxxx/awesome-langchain-zh langchain 工具,流程设计组件,服务,代理以及相关学习文档的合集(agent,service,tutorials,flow-design)	39	Emerging	138	—
17	webup/langgraph-in-action 《LangGraph 实战》配套实验示例代码	38	Emerging	144	Jupyter Notebook
18	joshuasundance-swca/ai_changelog Using large language models to maintain AI_CHANGELOG.md	35	Emerging	14	Python
19	RealKai42/langchainjs-juejin 从前端到 AI：langchain.js 入门和实战	35	Emerging	118	Jupyter Notebook
20	SpencerPresley/AIChainComposer AIChainComposer is a tool to quickly and easily compose complex LLM chains....	34	Emerging	12	Python
21	Sayvai-io/custom-tools Custom tools for LangChain	34	Emerging	10	Python
22	davidancor/c1v-id Identity resolution for AI applications	33	Emerging	3	Python
23	Ryota-Kawamura/Functions-Tools-and-Agents-with-LangChain You’ll explore new advancements like ChatGPT’s function calling capability,...	33	Emerging	18	Jupyter Notebook
24	lifan0127/nifi-langchain LangChain Expression Language (LCEL) As NiFi Processors	32	Emerging	15	Java
25	YizheZhang-Ervin/AI_LangChain LangChain + LangGraph + DeepAgents + LangChain4j + springAI	31	Emerging	1	Python
26	tleers/llm-api-starterkit Beginner-friendly repository for launching your first LLM API with Python,...	31	Emerging	105	Python
27	0w9/langchain-discord Some tools for Langchain to be used on Discord.	31	Emerging	18	Python
28	hmshb/langchain-ai-agent-google-gemini This repo contains AI AGENT using LangChain, Google Gemini LLM and DuckDuckGo	30	Emerging	2	Python
29	ArslanKAS/Functions-Tools-and-Agents-with-LangChain Explore new advancements like ChatGPT’s function calling capability, and...	30	Emerging	15	Jupyter Notebook
30	ksm26/Functions-Tools-and-Agents-with-LangChain Explore Functions, Tools and Agents with LangChain along with LangChain...	28	Experimental	5	Jupyter Notebook
31	pogzyb/port43 A set of open-source Information Security tools for the 🦜🔗 LangChain framework	27	Experimental	2	Python
32	rishabbahal9/LLM-memory-LangMem Managing Memory in LLMs with LangMem.	26	Experimental	5	Python
33	webup/langgraph-exercise-book Samples and demos with LangGraph and LangChain frameworks.	25	Experimental	16	Jupyter Notebook
34	Thordata/thordata-langchain-tools > Official LangChain tools for Thordata that expose web scraping, SERP APIs,...	25	Experimental	2	Python
35	Manipal-OSF/persistBool improving on the BooleanOutputParser feature of the LangChain Module.	25	Experimental	2	—
36	imbue-bit/TidyLangChain 🪶 The C language implementation of LangChain	24	Experimental	—	C
37	jonfairbanks/agichain BabyAGI + LangChain w/ Tools	23	Experimental	3	Python
38	taherfattahi/mailtrap-agent MailTrap Agent with LangChain	23	Experimental	4	Python
39	buraketmen/langchain-agent Build workflows and agents with LangChain and LangGraph	22	Experimental	2	Python
40	iroy2000/langchain-chaos-middleware A middleware for LangChain agents that intentionally injects failures...	22	Experimental	2	Python
41	Blattvorhang/langchain-notes-agent A reproducible LangChain-based LLM agent with tool invocation and persistent...	21	Experimental	—	Python
42	jiangnanboy/movie_llm_agent langchain agent，chatglm，neo4j实现movie qa。	21	Experimental	10	Python
43	hey-intent/langchain-on-demand-tools A implementation of Tools lazy loading in langchain	21	Experimental	—	TypeScript
44	di37/stock-price-checker-openai-langchain This project is created just to demonstrate how functions can be used for...	21	Experimental	9	Python
45	laolarou726/ToolCalling_Demo This is a minimal demo project to show the capabilities of a tool calling...	20	Experimental	2	Python
46	Ai-Whisperers/LangAi AI language processing toolkit with LangChain integration	19	Experimental	—	Python
47	DanielWay17/Data-analytic-agent Agent-base chatbot for analytic using Gemini LLM API and Langchain-Agent	19	Experimental	3	Jupyter Notebook
48	NayeemHossenJim/LangGraph A repos containing LangGraph learning with end to end project	19	Experimental	—	Jupyter Notebook
49	Yifan-Chang-Jerry/langchain-react-agent-with-custom-tools langchain ReAct agent代码示例，展示了如何定义custom tools来让llm使用。详情请参照langchain文档。The...	19	Experimental	1	Jupyter Notebook
50	FranzDiebold/advent-of-code-solver 🦜🔗 LangGraph approach to solve "Advent of Code" puzzles.	18	Experimental	2	Jupyter Notebook
51	FelixFu520/dataagent langchain-cli部署agent简单demo	17	Experimental	—	Python
52	zackproser/office-oracle-data-bench A Jupyter notebook used in building github.com/zackproser/office-oracle	16	Experimental	1	Jupyter Notebook
53	liuyueyi/langchain-demo 这是一个专注于 LangChain...	15	Experimental	2	Python
54	yu-iskw/lightdash-ai-tools Custom tools for AI frameworks as LangChain	14	Experimental	3	Python
55	cypherpulse/Lab2-DataWizard-AI-Powered-Data-Analysis This repository contains a hands-on Jupyter Notebook lab that demonstrates...	14	Experimental	1	Jupyter Notebook
56	cypherpulse/Lab1-AI-Math-Assistant-Tool-Calling-Langchain Hands-on lab: Build an AI Math Assistant using LangChain tool calling to...	14	Experimental	1	Jupyter Notebook
57	v833/llmops-api LLMOps API 是一个基于 Flask 的 API 服务，用于构建、管理和部署基于大语言模型的智能体应用。该项目集成了 LangGraph 和...	14	Experimental	5	Python
58	unikill066/GenAI_LangChain A deep-dive into LangChain and LangGraph frameworks, for building agentic...	13	Experimental	—	Jupyter Notebook
59	Juanseom/langchain-llm-chain-introduction Introduction to building AI agents with LangChain and Google Gemini. Two...	13	Experimental	—	Python
60	AIML-Solutions/LangChain01 LangChain experimentation lane for prompt chains, tool routing, and agent...	13	Experimental	—	—
61	bossjones/democracy-exe democracy_exe is an advanced, agentic Python application leveraging...	13	Experimental	—	Python
62	eliasdabbas/langchain-advertools LangChain integration for advertools	13	Experimental	6	Jupyter Notebook
63	ps1526/researchkg_interactive citation graph generator + visualizer	13	Experimental	3	JavaScript
64	amirsakib16/LangChain2026_Fundamentals This project explores the fundamentals of LangChain, focusing on building...	13	Experimental	—	Jupyter Notebook
65	KardelRuveyda/langgraph-exercises My LangGraph Exercises 🦜🕸️	12	Experimental	5	Jupyter Notebook
66	Shehjad2019/groq-ai-translator A fast multilingual translator built using Groq Llama 3.1 and LangChain with...	12	Experimental	1	Jupyter Notebook
67	shenhaofang/study-langgraph LangChain 学院课程跟学	11	Experimental	1	Jupyter Notebook
68	Rishujamaiyar/conversational-agents-langchain Generative Agent Conversation Simulation	11	Experimental	—	Jupyter Notebook
69	myatmyintzuthin/LLM_Movie_Agent Testing Movie Agent with Neo4j GraphDB from CLI	11	Experimental	—	Python
70	sifatulrabbi/openai-py-playground Testing out OpenAI, Langchain, and LLMs while building a portfolio bot.	11	Experimental	—	Python
71	ioniccommerce/ionic_langchain Langchain Tool wrapped around Ionic SDK & OpenAPI Spec	11	Experimental	4	Python
72	mendez-luisjose/Spotify-DJ-LangChain-Agent Spotify DJ LangChain Agent	11	Experimental	3	Python
73	rhuanbarros/llm-rag-agent-knowledgebase Full-stack artificial intelligence project with both backend (Langchain,...	11	Experimental	3	Jupyter Notebook

Comparisons in this category

Langchain1.0-Langgraph1.0-Learning and langchain-in-action (51 vs 43) Langchain1.0-Langgraph1.0-Learning and lc-studylab (51 vs 50)