Setup - Lemma

The Lemma SDK sends trace JSON directly to the Lemma API.

1. Install

npm install @uselemma/tracing

pip install uselemma-tracing

Find your API key and project ID in Lemma project settings.

export LEMMA_API_KEY="lma_..."
export LEMMA_PROJECT_ID="proj_..."

The SDK sends to https://api.uselemma.ai by default. Pass baseUrl to new Lemma({ baseUrl }) only when you need a custom endpoint.

import { Lemma } from "@uselemma/tracing";

export const lemma = new Lemma();

from uselemma_tracing import Lemma

lemma = Lemma()

await lemma.trace(
  {
    name: "hello-agent",
    input: "What is the capital of France?",
  },
  async () => {
    return "Paris.";
  },
);

lemma.trace(
    "hello-agent",
    lambda trace: "Paris.",
    input="What is the capital of France?",
)

Open the Lemma dashboard -> Traces. Your trace appears within seconds.

Define one agent execution.

Capture LLM calls with model, prompt, completion, and timing.

Record tool arguments and results.

The exact shape Lemma reads.

⌘I