LangSmith
Tracing, evaluation and monitoring for LLM apps and agents, with SDKs for several languages
Observability tool by LangChain
Chalk Labs
Need help deploying LangSmith?
Chalk Labs sets up agents like this inside real teams: connected to your tools, tested on your data, with a human in the loop where it matters.
Install
Pick your client. Read the repository before you give any tool access to your data.
pip install langsmith
Get the weekly diff
The weekly diff: one email a week with new agent tools, notable updates and grade changes, plus security alerts for tools you follow. Double opt-in, one-click unsubscribe.
About
Use cases: monitoring-observability, llm-evaluation
Reviews
Write a reviewNo reviews yet. Installed it? Reviews come from verified installers only. How reviews work
Fact sheet
- Category
- Tracing
- Self-host
- Yeslangchain.com
- Open source
- Yesgithub.com
- Regions
- EUraw.githubusercontent.com
- Works with
- crewai, vercel-ai-sdk, pydantic-aidocs.langchain.com
- Protocols
- opentelemetrylangchain.com
Plans
| Developer | $0 | 1 seat, 5k base traces/mo then pay-as-you-go |
|---|---|---|
| Plus | $39/month | per seat; 10k base traces/mo then pay-as-you-go; unlimited seats |
| Enterprise | Contact sales | custom pricing; self-hosted and hybrid options, custom SSO, support SLA |
From the vendor's pricing page, read Oct 24, 2026.
Facts read from the vendor's own pages by claude-haiku-5-5 on Oct 24, 2026; a fact is shown only with the page it came from.
Signals
- Stars
- 17
- Forks
- 14
- Open issues
- 16
- Last commit
- Oct 24, 2026 (6 days ago)
- Last release
- Oct 21, 2026 (9 days ago)
From GitHub (fetched Oct 24, 2026).
Details
- Packages
- pypi
langsmithnpmlangsmith - License
- MIT
- Repository
- github.com/langchain-ai/langsmith-python
- First seen
- Oct 24, 2026
- Last checked
- Oct 24, 2026
More from LangChain
- 0.753score
LangChain
LangChain
Python framework of interoperable components and integrations for building agents and LLM apps, with LangGraph and Deep Agents layered above it.
HarnessAFreshness: A★ 148.4K↓ 37.3M/wk - 0.748score
LangGraph
LangChain
Low-level Python orchestration framework for long-running stateful agents, with durable execution, human review points and short- and long-term memory.
HarnessAFreshness: A★ 43.8K↓ 13.1M/wk - 0.740score
Deep Agents
LangChain
Opinionated agent harness on LangGraph with sub-agents, filesystem access, context management, persistent memory and approval of tool calls.
HarnessAFreshness: A★ 30.6K↓ 1.9M/wk - 0.717score
LangGraph.js
LangChain
Open-source agent harness from LangChain for building agents with code, with LangSmith for testing and monitoring.
HarnessAFreshness: A★ 3.4K↓ 2.3M/wk - 0.715score
LangMem
LangChain
Library that lets LangGraph agents extract, consolidate and search their own long-term memory.
InfrastructureAFreshness: A★ 1.7Kmemory - 0.714score
LangChain.js
LangChain
JavaScript and TypeScript framework of interoperable components for building LLM apps and agents, with LangGraph.js and Deep Agents above it.
HarnessAFreshness: A★ 18.3K
Done for you
Rather not set it up yourself?
Chalk Labs scopes, builds and runs agents for your team: the task audit, the eval harness, the integrations and the weekly ops report. Fixed scope, priced before we start.
See how we build AI agents →Read the case studies
Chalk Labs is a two-founder AI and growth studio. We build AI agents, CRMs and MVPs for Web3 and AI companies, and have shipped 50+ product and token launches.
- launches shipped
- 50+
- launches shipped
- media placements
- 500+
- media placements
- founders on every account
- 2
- founders on every account
Press we've placed: Forbes · CoinDesk · Decrypt · Cointelegraph · The Block
Rahil Jain, Co-founder, Chalk Labs. Ex-Goldman Sachs engineer. You talk to the person who builds it.
Get LangSmith running in your business
Tell us what you want to automate. A founder replies within one working day with a plan, not a pitch deck.
Cite this page
LangSmith. Agent Mart. https://agentmart.dev/observability/langsmith (last updated 2026-10-24)