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Updated LangSmith setup instructions (#3933)

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Co-authored-by: Kartik Balasubramanian <22399046+HumanistSerif@users.noreply.github.com>
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AKSHAYA
2025-12-11 12:17:57 +05:30
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docs/advanced-ai/langchain/langsmith.md
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@@ -15,15 +15,28 @@ Self-hosted n8n only.
## Connect your n8n instance to LangSmith
1. [Log in to LangSmith](https://smith.langchain.com/settings) and get your API key.
1. Set the LangSmith environment variables:
| Variable | Value |
| -------- | ----- |
| LANGCHAIN_ENDPOINT | `"https://api.smith.langchain.com"` |
| LANGCHAIN_TRACING_V2 | `true` |
| LANGCHAIN_API_KEY | Set this to your API key |
| Variable | Value |
| ------------------------------- | ----- |
| `LANGCHAIN_ENDPOINT` | `"https://api.smith.langchain.com"` |
| `LANGCHAIN_TRACING_V2` | `true` |
| `LANGCHAIN_API_KEY` | Set this to your API key |
| `LANGCHAIN_PROJECT` | Optional project name (defaults to `"default"`) |
| `LANGCHAIN_CALLBACKS_BACKGROUND` | `true` (asynchronous trace upload) |
Set the variables so that they're available globally in the environment where you host your n8n instance. You can do this in the same way as the rest of your general configuration.
/// note
If you just created your LangSmith account, you will see a project named **"default"** only after the first trace is sent from n8n.
All traces go to this project unless you set `LANGCHAIN_PROJECT` to a different name.
///
/// note
Traces may appear with a short delay because `LANGCHAIN_CALLBACKS_BACKGROUND` defaults to asynchronous submission.
Set it to `false` if you prefer synchronous uploads for debugging.
///
Set the variables so that they're available globally in the environment where you host your n8n instance. You can do this in the same way as the rest of your general configuration.
1. Restart n8n.