LangSmith

LangSmith

LangSmith is an agent engineering platform that covers the full lifecycle of building, testing, deploying, and monitoring AI agents. It provides deep observability through structured tracing, enabling developers to debug complex agent behaviors. The platform includes evaluation tools to iteratively improve agents using real-world data, and a deployment service for scaling agents with built-in memory, human-in-the-loop, and fault tolerance. Key capabilities include LangSmith Engine, which autonomously surfaces and diagnoses issues in production traces, and Fleet, which allows non-technical users to create agents using natural language. LangSmith integrates with any agent stack via Python, TypeScript, Go, or Java SDKs and supports open-source frameworks like LangChain, LangGraph, and Deep Agents. Target users are AI teams from solo developers to global enterprises, focusing on improving agent reliability and development speed.

Automation
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Added on
Jul 13, 2026
Monthly Visits
103.4K
Agent tracingLLM evalsDeployment serverFleet agentsEngine diagnosticsSandboxesMulti-framework
Product information

Everything worth knowing about LangSmith

The complete picture — from everyday features to the technical detail builders and IT folks dig for.

Core features

What it actually does

Observability
Trace every agent run with structured timelines to understand exactly what happened, in what order, and why.
Evaluation
Capture production traces, turn them into test cases, and score agents with LLM-as-judge and human feedback.
Deployment
Ship and scale agents with durable checkpointing, human-in-the-loop, and fault-tolerant infrastructure.
Fleet
Create agents using plain language to automate routine tasks across daily tools with enterprise security.
Technical capabilities
Engine
Autonomously surface and diagnose agent failures, cluster issues, and propose fixes.
Sandboxes
Ephemeral, isolated sandboxes for running untrusted agent code with configurable TTLs and scaling.
Must watch videos
What is LangChain?
8:07
Tutorial8:07
What is LangChain?
Learn about IBM watsonx→ https://ibm.biz/BdvkK8 LangChain became immensely popular when it was launched in 2022, but how can it impact your development and application of AI models, Large Language Models (LLM) in particular. In this video Martin Keen shares an overview of the features and uses of LangChain. Get started for free on IBM Cloud → https://ibm.biz/sign-up-now Subscribe to see more videos like this in the future → http://ibm.biz/subscribe-now
What is LangChain? (Explained In 2 minutes)
2:18
Tutorial2:18
What is LangChain? (Explained In 2 minutes)
👉Get 40% OFF CodeCrafters: https://app.codecrafters.io/join?via=codehead-01 👉Git gud at coding with Scrimba https://scrimba.com/?via=codehead (20% OFF with this link) 👉ACE your next technical interview with 50% OFF AlgoMonster: https://algo.monster/codehead 👉I made a Discord server for all of you code heads to join: https://discord.gg/MfCKFK2fTe 👉Buy this tired Code Head a ☕: https://buymeacoffee.com/codehead ❓Topics covered: What is LangChain? How to install LangChain? How to use LangChain? How LangChain works? Chains and workflows Prompt templates LangChain Memory Tools and Agents RAG basics Document embeddings Vector databases Model swapping (OpenAI, Anthropic, local) LangGraph overview LangChain use cases #ai #langchain #programming
LangChain Explained in 10 Minutes (Components Breakdown + Build Your First AI Chatbot)
12:27
Tutorial12:27
LangChain Explained in 10 Minutes (Components Breakdown + Build Your First AI Chatbot)
🧪Try LangChain Hands-on Labs for Free: https://kode.wiki/462mo31 Building a company chatbot that remembers conversations, accesses your knowledge base, and provides intelligent responses seems overwhelming - but LangChain makes it surprisingly simple. In this comprehensive video, you'll discover why LangChain has become the go-to framework for building production-ready AI agents. We break down the key differences between raw LLMs and intelligent agents, showing you exactly why traditional approaches fall short when building real-world applications. 🎯 What You'll Learn: • The critical components every AI agent needs (LLM, memory, tools, vector database, RAG) • How LangChain simplifies complex AI workflows • Why vendor independence matters (easily switch from OpenAI to Anthropic to Gemini) • Building chat pipelines with LangChain Expression Language (LCEL) • RAG implementation for knowledge retrieval from company documents • Complete deployment process for production-ready chatbots 🚀 Hands-On Labs Included: Follow along with our free interactive labs where you'll build a complete chatbot from installation to deployment. We cover prompt piping, model chaining, memory systems, and RAG implementation with real code examples you can run immediately. 🧪Try LangChain Hands-on Labs for Free: https://kode.wiki/462mo31 📌 Learn more about RAG here: https://youtu.be/_HQ2H_0Ayy0 ⏰ VIDEO TIMESTAMPS: 00:00 - Introduction: Why You Need LangChain? 00:58 - LLMs vs AI Agents Explained 02:05 - Traditional Software vs Agentic Software 02:29 - LangChain Core Components 03:36 - Traditional Software vs Agentic Software 04:47 - Practical Lab Demo Introduction 05:20 - Demo - Install LangChain Ecosystem 06:00 - Demo - Prompt Templates 08:49 - Demo - LCEL (LangChain Expression Language) 10:00 - Demo - Memory Systems & RAG Implementation 11:14 - Deploying Your Production Chatbot 🔔 SUBSCRIBE for cutting-edge AI tutorials that actually matter! #LangChain #AIAgents #AIchatbot #OpenAI #AI #Chatbot #PythonProgramming #Langgraph #LangChaintutorial # #LLM #AIagents #Anthropic #BuildChatbot #AItools #kodekloud

Who uses it

Real use cases, no hype
Observability for Agentic AI
Understand exactly what your agent is doing with structured timelines and detailed step-by-step tracing
Evaluation Workbench
Test agent quality with reusable LLM-as-judge evals, human feedback, and online scoring
Deploy Long-Running Agents
Deploy agents with durable execution, memory, human-in-the-loop, and scalable infrastructure
Automated Failure Detection
Cluster production failures and propose fixes with LangSmith Engine's autonomous analysis
No-Code Agent Creation
Create agents for daily tasks using plain language with Fleet's built-in templates and integrations
Sandboxed Code Execution
Run untrusted agent-generated code in ephemeral, isolated environments with configurable TTLs
Cost and Performance Monitoring
Track token usage, latency, and reliability with analytics and AI-driven insights
What's great
  • Deep trace-level observability for agentic workflows
  • Integrated evaluation with LLM-as-judge and human feedback
  • Purpose-built deployment server for long-running agents
Technical strengths
  • Durable state persistence and memory management
  • Framework-agnostic SDK support (Python, TS, Go, Java)
  • Automated failure clustering and root cause diagnosis
Where it falls short
  • Costs grow quickly with high trace volumes
  • Learning curve for multiple integrated products
  • Enterprise features require custom pricing and sales
Technical limitations
  • Trace retention limits and paid extensions
  • Self-hosting only available on Enterprise plan
  • Deep integration with LangChain ecosystem hinders flexibility
For technical folks

The deep-dive specs

SDK Languages
Python, TypeScript, Go, Java
Tracing Method
Structured timelines with OpenTelemetry
Agent Runtime
LangGraph-based durable execution
Protocol Support
A2A, MCP
Hosting Options
Cloud, Hybrid, Self-Hosted

FAQ

Includes technical Q&A
A trace represents a single execution of your application and can include many individual steps such as LLM calls and other tracked events.

Traffic Insights

Monthly Visits

103.4K

September 2026

Growth Rate

-0,2%

vs last month

Dominance

0%

in Automation

Top Country

Top Countries Breakdown

Growth Trend

Declining

Traffic has decreased compared to last month.

Honest pricing

No sneaky tiers, no “contact sales”

Here's who each plan is actually for — and where the hidden charges might hit.

Developer
Free

Individuals

  • Up to 5k base traces / mo
  • then pay-as-you-go
  • Community support
  • 1 seat
Plus
Most picked
$39/mo

Teams

  • Up to 10k base traces / mo
  • then pay-as-you-go
  • Access to Deployment
  • Sandboxes
  • Engine
  • and more
  • Email support
Enterprise
Custom

Enterprise

  • Self-hosted and hybrid deployment options
  • Custom SSO and RBAC
  • Support SLA
  • Custom seats and workspaces
Reviews

What the internet actually thinks

Data refreshed weekly. No paid placements.

Trustpilot
Not reviewed yet
G2
G2
Not reviewed yet
C
Capterra
Not reviewed yet
Product Hunt
Not reviewed yet
COMMUNITY COMMENTS

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Detail tags
Found via these searches
#AI#Agents#LLM#Observability#Evaluation#Deployment#AIDevelopment