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Build and run LangSmith evaluators v1.0.0

Use this resource to build evaluators and run end-to-end evaluations in LangSmith

New

  • 486 downloads
  • 208 likes
  • 245 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install langsmith-evaluator-design

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent first inspects your agent, writes LLM-as-judge or code evaluators, then defines the run function that captures outputs and trajectories. It runs the evaluation with evaluate() locally or through uploaded evaluators. You get an evaluation pipeline in Python or TypeScript.

Mostly picked by

Updated November 2, 2026

Card for the “Build and run LangSmith evaluators” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • SKILL.md: LLM-as-judge and code evaluators
  • SKILL.md: run functions and trajectory capture

Good fit for

  • You want to measure an agent's quality on each release
  • You need an automatic judge for open-ended answers

Not for

    Tags

    • evaluator
    • llm-as-judge
    • evaluation
    • langsmith
    • trajectories

    About

    You say

    “Write an LLM-as-judge evaluator that scores my agent's answers for faithfulness.”

    Card for the “Build and run LangSmith evaluators” skill

    Skill published by langchain-ai under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to build evaluators and run end-to-end evaluations in LangSmith
    3. Review and adjust the result

    Content preview

    Files

    • LICENSE1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • SKILL.md22.5 KB

    Origin and licence

    Listed unmodified

    Author
    langchain-ai
    Source
    github.com/langchain-ai/langsmith-skills/tree/d69a8fe41816c1faba25399e60301b79b747d147/config/skills/langsmith-evaluator
    Licence
    MIT

    Notice

    « langsmith-evaluator » (langchain-ai, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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