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Connecting LangSmith to Bigspin lets you pull your LangSmith traces directly into Bigspin projects without any manual exporting or uploading. Once the integration is active, you can create projects that source data from your LangSmith workspace, apply metadata filters to scope which traces you want to analyze, and let Bigspin handle ingestion automatically.

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Connect your LangSmith account

1

Open Integrations settings

In the Bigspin dashboard, go to Settings > Integrations.
2

Select LangSmith

Click the LangSmith card to open the connection form.
3

Enter your API key

Paste your LangSmith API key into the field. LangSmith API keys follow the format:
If you don’t have a key yet, follow the LangSmith API key guide to generate one.
4

Validate and connect

Bigspin validates the key against your LangSmith account before saving. If validation succeeds, the integration appears as connected on the Integrations page.
Validation happens automatically when you submit the form. Bigspin does not store your key until the check passes.

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Create a project with LangSmith as the data source

Once the integration is connected, you can create Bigspin projects that pull from your LangSmith workspace.
1

Go to Projects

Navigate to Projects in the Bigspin dashboard.
2

Open Data Sources

Click Data Sources when setting up a new project.
3

Select LangSmith

Choose LangSmith from the list of available sources.
4

Apply metadata filters (optional)

Bigspin fetches the metadata keys available in your LangSmith workspace and displays them in a filter panel. For each key you want to filter on:
  • Select the metadata key from the dropdown.
  • Choose or type the value to match. Bigspin shows sample values pulled from your workspace to help you pick the right one.
  • Review the preview count — Bigspin shows how many traces match your current filter combination before you finalize the project.
Use metadata filters to scope ingestion to a specific model, environment, or user segment. Narrowing the filter set keeps your project focused and speeds up analysis.
You can add multiple key/value filters. Bigspin applies them together, ingesting only traces that match all conditions.
5

Finish creating the project

Complete the remaining project setup steps. Bigspin begins ingesting matching LangSmith traces automatically.

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Ongoing ingestion

After initial setup, Bigspin ingests traces from LangSmith automatically. You do not need to trigger syncs manually or re-export data from LangSmith.
If you rotate your LangSmith API key, return to Settings > Integrations and update the key so ingestion continues without interruption.