> ## Documentation Index
> Fetch the complete documentation index at: https://hub.hcompany.ai/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> H Platform has four products: the Agents API (managed computer-use agents, base URL https://agp.eu.hcompany.ai/api/v2 or https://agp.hcompany.ai/api/v2 for the US), the Models API (OpenAI-compatible Holo vision-language models at https://api.hcompany.ai/v1), HoloDesktop CLI (Holo on the user's own desktop), and HoloTab (a free no-code Chrome extension that runs Holo in the user's browser, with recordable routines and schedules).
> Authenticate with a bearer API key from the HAI_API_KEY environment variable. SDKs: `pip install hai-agents` (Python, `from hai_agents import Client`) and `npm install hai-agents` (TypeScript, `import { HaiAgentsClient } from "hai-agents"`). CLI: `hai`.
> Agents do work in a browser or on a desktop; describe the task as an imperative instruction. To run a task quickly, prefer the pre-built agent `h/web-surfer-flash`. Read results from the session's `latest_answer` after it reaches a terminal status.
> Sessions are the unit of work; wait for a terminal status (completed, failed, timed_out, interrupted) before reading the answer. Use webhooks or the `changes` long-poll endpoint to follow progress.

# Set the default browser profile

> Mark a browser profile as the default that sessions load when none is named.

Marks a profile as your [default](/agents-api/browser/profiles#default-profiles) for its `browser_name`. Sessions created with `use_default_browser_profile: true` on the [Browser environment](/agents-api/browser/configuration) load this profile.

You have at most one default per browser, so setting a new default replaces the previous one for the same `browser_name`. No need to unset it first.

**Returns** the updated [profile object](/agents-api/browser-profiles/retrieve) with `is_default: true`.

***

## Path parameters

<ParamField path="profile_id" type="string" required>
  The profile's `id` (UUID).
</ParamField>

***

## Examples

<CodeGroup>
  ```bash cURL theme={"system"}
  curl -X PUT "https://agp.eu.hcompany.ai/api/v2/browser-profiles/a1b2c3d4-5678-90ab-cdef-1234567890ab/default" \
    -H "Authorization: Bearer $HAI_API_KEY"
  ```

  ```python Python theme={"system"}
  from hai_agents import Client

  client = Client()

  profile = client.browser_profiles.set_default_browser_profile(
      profile_id="a1b2c3d4-5678-90ab-cdef-1234567890ab",
  )
  print(profile.is_default)
  ```

  ```typescript TypeScript theme={"system"}
  import { HaiAgentsClient } from "hai-agents";

  const client = new HaiAgentsClient();

  const profile = await client.browserProfiles.setDefaultBrowserProfile({
    profileId: "a1b2c3d4-5678-90ab-cdef-1234567890ab",
  });
  console.log(profile.isDefault);
  ```
</CodeGroup>

```json Response theme={"system"}
{
  "id": "a1b2c3d4-5678-90ab-cdef-1234567890ab",
  "name": "acme-prod-login",
  "description": null,
  "browser_name": "chromium",
  "browser_version": "131",
  "s3_path": "browser-profiles/finished/org_123/a1b2c3d4-5678-90ab-cdef-1234567890ab/profile.zip",
  "file_size_bytes": 102400,
  "checksum": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
  "usage_count": 3,
  "last_used_at": "2026-06-16T13:05:00Z",
  "labels": {"team": "qa"},
  "is_default": true,
  "created_at": "2026-06-16T14:30:00Z",
  "updated_at": "2026-07-08T09:00:00Z"
}
```

***

## Errors

| Status | Cause                                       |
| ------ | ------------------------------------------- |
| `404`  | Profile not found or you don't have access. |