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 68 langchain tool building tools tracked. 4 score above 50 (established tier). The highest-rated is tryAGI/LangChain at 64/100 with 992 stars. 1 of the top 10 are actively maintained.

Get all 68 projects as JSON

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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...	64	Established	992	C#
2	UiPath/uipath-langchain-python Python SDK that enables developers to build and deploy LangGraph agents to...	60	Established	67	Python
3	sardanaaman/langgraph-compass Intelligent follow-up question generation for conversational LangGraph agents	51	Established	15	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	Shikenso-Analytics/langchain-taiga Python toolkit that lets your LangChain agents automate Taiga: create,...	47	Emerging	3	Python
6	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...	46	Emerging	283	Python
7	msoedov/langcorn ⛓️ Serving LangChain LLM apps and agents automagically with FastApi. LLMops	45	Emerging	940	Python
8	e7217/langchain-naver-community 🚀 Community-driven Naver integrations for LangChain! Seamlessly connect...	45	Emerging	5	Python
9	picahq/pica-langchain Python SDK for LangChain	41	Emerging	7	Python
10	li2109/langtorch 🔥 Building composable LLM applications & workflow with Java.	37	Emerging	308	Java
11	AttackIQ/SigmAIQ A pySigma wrapper and langchain toolkit for automatic rule creation/translation	37	Emerging	92	Python
12	huangjia2019/langchain-in-action Practical LangChain patterns and implementations for real-world LLM...	36	Emerging	743	Python
13	jina-ai/agentchain Chain together LLMs for reasoning & orchestrate multiple large models for...	36	Emerging	610	Python
14	davidancor/c1v-id Identity resolution for AI applications	35	Emerging	3	Python
15	xukecheng/APITable-LLMs-Enhancement-Experiments This is a test version of the agent_toolkit in langchain. Please do not use...	34	Emerging	10	Jupyter Notebook
16	jbpayton/langchain-stock-screener LangChain agent usable tool to screen stock data	33	Emerging	44	Python
17	NicolaiLassen/langchain-adk A LangChain-powered Agent Development Toolkit — async event-streaming...	32	Emerging	2	Python
18	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)	32	Emerging	138	—
19	webup/langgraph-in-action 《LangGraph 实战》配套实验示例代码	31	Emerging	144	Jupyter Notebook
20	joshuasundance-swca/ai_changelog Using large language models to maintain AI_CHANGELOG.md	28	Experimental	14	Python
21	RealKai42/langchainjs-juejin 从前端到 AI：langchain.js 入门和实战	28	Experimental	118	Jupyter Notebook
22	0w9/langchain-discord Some tools for Langchain to be used on Discord.	28	Experimental	18	Python
23	SpencerPresley/AIChainComposer AIChainComposer is a tool to quickly and easily compose complex LLM chains....	27	Experimental	12	Python
24	Sayvai-io/custom-tools Custom tools for LangChain	27	Experimental	10	Python
25	Ryota-Kawamura/Functions-Tools-and-Agents-with-LangChain You’ll explore new advancements like ChatGPT’s function calling capability,...	26	Experimental	18	Jupyter Notebook
26	lifan0127/nifi-langchain LangChain Expression Language (LCEL) As NiFi Processors	25	Experimental	15	Java
27	imbue-bit/TidyLangChain 🪶 The C language implementation of LangChain	24	Experimental	—	C
28	YizheZhang-Ervin/AI_LangChain LangChain + LangGraph + DeepAgents + LangChain4j + springAI	24	Experimental	1	Python
29	tleers/llm-api-starterkit Beginner-friendly repository for launching your first LLM API with Python,...	24	Experimental	105	Python
30	ArslanKAS/Functions-Tools-and-Agents-with-LangChain Explore new advancements like ChatGPT’s function calling capability, and...	23	Experimental	15	Jupyter Notebook
31	hmshb/langchain-ai-agent-google-gemini This repo contains AI AGENT using LangChain, Google Gemini LLM and DuckDuckGo	23	Experimental	2	Python
32	Manipal-OSF/persistBool improving on the BooleanOutputParser feature of the LangChain Module.	23	Experimental	2	—
33	pogzyb/port43 A set of open-source Information Security tools for the 🦜🔗 LangChain framework	22	Experimental	2	Python
34	langchain-samples/context-failure-evals Evals with langsmith designed to solve real-world context failure...	22	Experimental	—	Jupyter Notebook
35	ksm26/Functions-Tools-and-Agents-with-LangChain Explore Functions, Tools and Agents with LangChain along with LangChain...	21	Experimental	5	Jupyter Notebook
36	iroy2000/langchain-chaos-middleware A middleware for LangChain agents that intentionally injects failures...	21	Experimental	2	Python
37	Thordata/thordata-langchain-tools > Official LangChain tools for Thordata that expose web scraping, SERP APIs,...	21	Experimental	2	Python
38	rishabbahal9/LLM-memory-LangMem Managing Memory in LLMs with LangMem.	20	Experimental	5	Python
39	hey-intent/langchain-on-demand-tools A implementation of Tools lazy loading in langchain	19	Experimental	—	TypeScript
40	Blattvorhang/langchain-notes-agent A reproducible LangChain-based LLM agent with tool invocation and persistent...	19	Experimental	—	Python
41	NayeemHossenJim/LangGraph A repos containing LangGraph learning with end to end project	19	Experimental	—	Jupyter Notebook
42	Ai-Whisperers/LangAi AI language processing toolkit with LangChain integration	19	Experimental	—	Python
43	webup/langgraph-exercise-book Samples and demos with LangGraph and LangChain frameworks.	18	Experimental	16	Jupyter Notebook
44	jonfairbanks/agichain BabyAGI + LangChain w/ Tools	16	Experimental	3	Python
45	taherfattahi/mailtrap-agent MailTrap Agent with LangChain	16	Experimental	4	Python
46	FelixFu520/dataagent langchain-cli部署agent简单demo	15	Experimental	—	Python
47	buraketmen/langchain-agent Build workflows and agents with LangChain and LangGraph	15	Experimental	2	Python
48	jiangnanboy/movie_llm_agent langchain agent，chatglm，neo4j实现movie qa。	14	Experimental	10	Python
49	di37/stock-price-checker-openai-langchain This project is created just to demonstrate how functions can be used for...	14	Experimental	9	Python
50	YanSte/NLP-LLM-LangChain-ReAct-MultStepReason-2 Natural Language Processing (NLP) and Large Language Models (LLM) with...	14	Experimental	1	Jupyter Notebook
51	zackproser/office-oracle-data-bench A Jupyter notebook used in building github.com/zackproser/office-oracle	14	Experimental	1	Jupyter Notebook
52	laolarou726/ToolCalling_Demo This is a minimal demo project to show the capabilities of a tool calling...	13	Experimental	2	Python
53	liuyueyi/langchain-demo 这是一个专注于 LangChain...	13	Experimental	2	Python
54	DanielWay17/Data-analytic-agent Agent-base chatbot for analytic using Gemini LLM API and Langchain-Agent	12	Experimental	3	Jupyter Notebook
55	cypherpulse/Lab1-AI-Math-Assistant-Tool-Calling-Langchain Hands-on lab: Build an AI Math Assistant using LangChain tool calling to...	12	Experimental	1	Jupyter Notebook
56	cypherpulse/Lab2-DataWizard-AI-Powered-Data-Analysis This repository contains a hands-on Jupyter Notebook lab that demonstrates...	12	Experimental	1	Jupyter Notebook
57	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...	12	Experimental	1	Jupyter Notebook
58	yu-iskw/lightdash-ai-tools Custom tools for AI frameworks as LangChain	12	Experimental	3	Python
59	FranzDiebold/advent-of-code-solver 🦜🔗 LangGraph approach to solve "Advent of Code" puzzles.	11	Experimental	2	Jupyter Notebook
60	iannil/synton-db SYNTON-DB is a specialized memory database designed for Large Language...	11	Experimental	—	Rust
61	Juanseom/langchain-llm-chain-introduction Introduction to building AI agents with LangChain and Google Gemini. Two...	11	Experimental	—	Python
62	bossjones/democracy-exe democracy_exe is an advanced, agentic Python application leveraging...	11	Experimental	—	Python
63	amirsakib16/LangChain2026_Fundamentals This project explores the fundamentals of LangChain, focusing on building...	11	Experimental	—	Jupyter Notebook
64	unikill066/GenAI_LangChain A deep-dive into LangChain and LangGraph frameworks, for building agentic...	11	Experimental	—	Jupyter Notebook
65	AIML-Solutions/LangChain01 LangChain experimentation lane for prompt chains, tool routing, and agent...	11	Experimental	—	—
66	EmanZahid123/employee-qa-langgraph Natural language Employee Q&A system built with LangGraph and LangChain,...	11	Experimental	—	Jupyter Notebook
67	Dotonomic/word-chainer Generates chains of words in which each word is related to its predecessor.	10	Experimental	1	PHP
68	AIMPED/langchain_BasicAgent boilerplate code for a basic langchain agent with tool usage. RAG,...	10	Experimental	1	Python

Comparisons in this category

Langchain1.0-Langgraph1.0-Learning and langchain-in-action (51 vs 36) Langchain1.0-Langgraph1.0-Learning and lc-studylab (51 vs 46)