---
id: "entity-langsmith"
type: "entity"
entityType: "product"
canonicalName: "LangSmith"
aliases: []
source_timestamps: ["§ Where Harness Engineering is Going"]
tags: ["platform", "debugging"]
related: ["entity-langchain", "question-self-analyzing-traces"]
canonicalUrl: "https://smith.langchain.com/"
---
# LangSmith

## Profile

**LangSmith** is [[entity-langchain|LangChain]]'s agent engineering platform. It is used for:

- **Debugging agent decisions** — tracing every model call, tool call, and intermediate state.
- **Evaluating changes** — A/B testing harness modifications against benchmarks.
- **Deploying agents** to production environments with observability.

## Role in This Source

Mentioned in §“Where Harness Engineering is Going” as the operational tooling that enables iterative harness engineering — and as a likely substrate for emerging research questions like [[question-self-analyzing-traces|agents that analyze their own traces]].

## Canonical URL

https://smith.langchain.com/