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1. Create a project

Sign in at app.runagain.ai and create a project (or open the one that was created for you). Each project is an isolated workspace with its own traces, datasets, experiments, and API keys.

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2. Generate an API key

In your project, open the onboarding on the Overview page (or Settings → Create API key) and click Generate API key. Copy the sk_… secret — it’s shown once.
The secret is displayed a single time and never again. Store it in your secret manager or .env file immediately.

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3. Point your agent at RunAgain

Pick your stack:

Claude Agent SDK

Vercel AI SDK

Claude Code (CLI)

All of them export over OTLP/HTTP to https://ingest.runagain.ai, authenticated with your key via the x-runagain-key header.
Environment
RUNAGAIN_API_KEY=sk_…
RUNAGAIN_INGEST_URL=https://ingest.runagain.ai

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4. Verify

Produce some activity, then open your project’s Traces page — your runs appear within seconds. From there you can inspect spans, score runs, and set up drift monitors.

Not sure where to start?

Tracing Claude Code in your terminal takes three environment variables and no code changes.