---
title: "Core features"
description: "Session capabilities."
---

> Documentation Index
> Fetch the complete documentation index at: https://help.tooluse.net/llms.txt
> Use this file to discover all available pages before exploring further.

# Core features

<p>Choose viewport, timeout, metadata, recording and domain restrictions when creating a session. A capability that the selected transport cannot provide returns an explicit refusal.</p>
<pre><code class="language-bash">curl -X POST "https://api.tooluse.net/v1/browsers/sessions" \
  -H "Authorization: Bearer $TOOLUSE_API_KEY" \
  -H "Idempotency-Key: tooluse-example-001" \
  -H "Content-Type: application/json" \
  -d '{"timeout":300,"browserSettings":{"viewport":{"width":1280,"height":720}}}'
</code></pre>
<p>Use the returned connection URL with a compatible CDP client, or call the native HTTP actions API. Context persistence depends on encrypted storage being configured. Extensions and uploaded certificate authorities are not available.</p>
<p>See <a href="/browsers/getting-started/create-browser-session">Create a browser session</a> and the <a href="/browsers/api">Browsers API</a> for authentication, request fields, and limits.</p>

Source: https://help.tooluse.net/browsers/core-features/overview/index.mdx