langsmith-evaluator

Create and deploy LLM agent evaluation pipelines within the LangSmith ecosystem.

2|Updated Apr 3, 2026
One-click install
npx skills add https://github.com/jxtngx/dgx-lab --skill langsmith-evaluator-jxtngx
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: langsmith-evaluator
Source: https://github.com/jxtngx/dgx-lab/tree/main/.cursor/skills/langsmith-evaluator
Command: npx skills add https://github.com/jxtngx/dgx-lab --skill langsmith-evaluator-jxtngx

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires langsmith, langchain-openai, python-dotenv, openai.

What problem does it solve?

This skill addresses the complexity of validating agent performance by providing a structured framework for creating, testing, and deploying evaluators that measure accuracy, trajectory, and quality.

Core Features & Use Cases

  • Evaluator Creation: Develop LLM-as-Judge or custom deterministic code evaluators to grade agent outputs.
  • Run Function Definition: Standardize how agent outputs and trajectories are captured for consistent evaluation.
  • Use Case: Use this skill to automatically grade a customer support agent's responses against a golden dataset of expected answers, ensuring high accuracy before production deployment.

Quick Start

Use the langsmith-evaluator skill to define a custom code evaluator that checks if the agent trajectory matches the expected tool call sequence in your dataset.

Frequently Asked Questions about langsmith-evaluator

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build LLM-as-Judge evaluators for LangChain agent testing?

To build LLM-as-Judge evaluators for LangChain agent testing, you define custom evaluation functions that grade agent outputs and execution trajectories. This skill standardizes run function definition to capture outputs consistently for validation against expected results.

What is the best way to validate agent trajectories in a LangSmith evaluation pipeline?

Validating agent trajectories in a LangSmith evaluation pipeline involves creating custom code evaluators that check if the execution path matches expected tool call sequences. This approach ensures structured grading of agent accuracy before production deployment.

Can I use Python SDKs to create offline and online evaluation pipelines for LLM agents?

Yes, you can use Python or TypeScript SDKs to create offline and online evaluation pipelines for LLM agents. Integration with the LangSmith ecosystem enables dataset-linked or project-linked evaluation runs to measure output quality and accuracy.

Do I need LangSmith CLI to deploy custom code evaluators?

Yes, managing and deploying custom code evaluators requires integration with the LangSmith CLI. This setup facilitates the deployment of structured evaluation pipelines to validate LLM agent performance within your testing environment.

Does langsmith-evaluator support grading against a golden dataset of expected answers?

Yes, langsmith-evaluator supports grading agent responses against a golden dataset of expected answers. You can automatically evaluate customer support agents by comparing outputs with predefined expected data to ensure high accuracy.