> ## Documentation Index
> Fetch the complete documentation index at: https://langchain-5e9cc07a-preview-consol-1763754753-4714c41.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Agent Server API reference for LangSmith Deployment

The Agent Server API reference is available within each [deployment](/langsmith/deployments) at the `/docs` endpoint (e.g. `http://localhost:8124/docs`).

<Card title="API Reference" href="https://langchain-ai.github.io/langgraph/cloud/reference/api/api_ref.html" icon="book">
  View the full Agent Server API reference documentation
</Card>

## Authentication

For deployments to LangSmith, authentication is required. Pass the `X-Api-Key` header with each request to the Agent Server. The value of the header should be set to a valid LangSmith API key for the organization where the Agent Server is deployed.

Example `curl` command:

```shell theme={null}
curl --request POST \
  --url http://localhost:8124/assistants/search \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: LANGSMITH_API_KEY' \
  --data '{
  "metadata": {},
  "limit": 10,
  "offset": 0
}'
```

***

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