Smooth Browser

Smooth CLI is a browser for AI agents to interact with websites, authenticate, scrape data, and perform complex web-based tasks using natural language.

Prerequisites

Assume the Smooth CLI is already installed. If not, you can install it by running:

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Assume an API key is already configured. If you encounter authentication errors, configure it with:

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To verify the configuration:
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Get an API key at https://app.smooth.sh

If the account is out of credits, ask the user to upgrade their plan at https://app.smooth.sh

Basic Workflow

1. Create a Profile (Optional)

Profiles are useful to persist cookies, login sessions, and browser state between sessions.

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List existing profiles:
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2. Start a Browser Session

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Options:

• - --profile-id - Use a specific profile (optional, creates anonymous session if not provided)
• INLINECODE1 - Initial URL to navigate to (optional)
• INLINECODE2 - Comma-separated file IDs to make available in the session (optional)
• INLINECODE3 - Device type (default: mobile)
• INLINECODE4 - Load profile without saving changes
• INLINECODE5 - Comma-separated URL patterns to restrict access to certain URLs only (e.g., "https://example.com/,https://api.example.com/")
• INLINECODE6 - Disable the default proxy (see note below)

Important: Save the session ID from the output - you'll need it for all subsequent commands.

Proxy behavior: By default, the CLI automatically configures a built-in proxy for the browser session. If a website blocks the proxy or you need direct connections, disable it with --no-proxy.

3. Run Tasks in the Session

Execute tasks using natural language:

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With structured output (for tasks requiring interaction):
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With metadata (the agent will be):
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Options:

• - --url - Navigate to this URL before running the task
• INLINECODE9 - JSON object with variables for the task
• INLINECODE10 - JSON schema for structured output
• INLINECODE11 - Maximum agent steps (default: 32)
• INLINECODE12 - Output results as JSON

Notes:
It's important that you give tasks at the right level of abstraction. Not too prescriptive - e.g. single-step actions - and not too broad or vague.

Good tasks:

• - "Search on Linkedin for people working as SDEs at Amazon, and return 5 profile urls"
• "Find the price of an iPhone 17 on Amazon"

Bad tasks:

• - "Click search" -> too prescriptive!
• "Load google.com, write 'restaurants near me', click search, wait for the page to load, extract the top 5 results, and return them." -> too prescriptive! you can say "search restaurants near me on google and return the top 5 results"
• "Find software engineers that would be a good fit for our company" -> too broad! YOU need to plan how to achieve the goal and run well-defined tasks that compose into the given goal

IMPORTANT: Smooth is powered by an intelligent agent, DO NOT over-controll it, and give it well-defined goal-oriented tasks instead of steps.

4. Close the Session

You must close the session when you're done.

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Important: Wait 5 seconds after closing to ensure cookies and state are saved to the profile if you need it for another session.

Common Use Cases

Authentication & Persistent Sessions

Create a profile for a specific website:
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Reuse authenticated profile:
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Keep profiles organized: Save to memory which profiles authenticate to which services so you can reuse them efficiently in the future.

Sequential Tasks on Same Browser

Execute multiple tasks in sequence without closing the session:

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Important: run preserves the browser state (cookies, URL, page content) but not the browser agent's memory. If you need to carry information from one task to the next, you should pass it explicitly in the prompt.

Example - Passing context between tasks:
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Notes:

• - The run command is blocking. If you need to carry out multiple tasks at the same time, you MUST use subagents (Task tool).
• All tasks will use the current tab, you cannot request to run tasks in a new tab. If you need to preserve the current tab’s state, you can open a new session.
• Each session can run only one task at a time. To run tasks simultaneously, use subagents with one session each.
• The maximum number of concurrent sessions depends on the user plan.
• If useful, remind the user that they can upgrade the plan to give you more concurrent sessions.

Web Scraping with Structured Output

Option 1: Using run with structured output:

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Option 2: Using extract for direct data extraction:

The extract command is more efficient for pure data extraction as it doesn't use agent steps.

It's like a smart fetch that can extract structured data from dynamically rendered websites:

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When to use each:

• - Use extract when you're on the right page or know the right url and just need to pull structured data
• Use run when you need the agent to navigate, interact, or perform complex actions before extracting

Working with Files

Upload files for use in sessions:

Files must be uploaded before starting a session, then passed to the session via file IDs:

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Upload multiple files:
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Download files from session:

smooth run -- <session-id> "Download the monthly report PDF" --url
smooth close-session -- <session-id>

# After session closes, get download URL
smooth downloads -- <session-id>
# Visit the URL to download files

Live View & Manual Intervention

When automation needs human input (CAPTCHA, 2FA, complex authentication):

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Direct Browser Actions

Extract data from current page:

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Navigate to URL then extract:

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Execute JavaScript in the browser:

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Profile Management

List all profiles:
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Delete a profile:
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When to use profiles:

• - ✅ Websites requiring authentication
• ✅ Maintaining session state across multiple task runs
• ✅ Avoiding repeated logins
• ✅ Preserving cookies and local storage

When to skip profiles:

• - Public websites that don't require authentication
• One-off scraping tasks
• Testing scenarios

File Management

Upload files:
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Delete files:

smooth delete-file <file-id>

Best Practices

1. 1. Always save session IDs - You'll need them for subsequent commands
2. Use profiles for authenticated sessions - Track which profile is for which website
3. Wait 5 seconds after closing sessions - Ensures state is properly saved
4. Use descriptive profile IDs - e.g., "linkedin-personal", "twitter-company"
5. Close sessions when done - Graceful close (default) ensures proper cleanup
6. Use structured output for data extraction - Provides clean, typed results
7. Run sequential tasks in the same session - Keep the session continuous when steps rely on previous work.
8. Use subagents with one session each for independent tasks - Run tasks in parallel to speed up work.
9. Coordinate resources - When working with subagents, you must create and assign ONE section to each subagent without having them creating them.
10. Do not add url query parameters to urls, e.g. avoid ?filter=xyz - Start at the base URL and let the agent navigate the UI to apply filters.
11. Smooth is powered by an intelligent agent - Give it tasks, not individual steps.

Troubleshooting

"Session not found" - The session may have timed out or been closed. Start a new one.

"Profile not found" - Check smooth list-profiles to see available profiles.

CAPTCHA or authentication issues - Use smooth live-view -- <session-id> to let the user manually intervene.

Task timeout - Increase --max-steps or break the task into smaller steps.

Command Reference

Profile Commands

• - smooth create-profile [--profile-id ID] - Create a new profile
• INLINECODE24 - List all profiles
• INLINECODE25 - Delete a profile

File Commands

• - smooth upload-file <path> [--name NAME] [--purpose PURPOSE] - Upload a file
• INLINECODE27 - Delete an uploaded file

Session Commands

• - smooth start-session [OPTIONS] - Start a browser session
• INLINECODE29 - Close a session
• INLINECODE30 - Run a task
• INLINECODE31 - Extract structured data
• INLINECODE32 - Execute JavaScript
• INLINECODE33 - Get interactive live URL
• INLINECODE34 - Get recording URL
• INLINECODE35 - Get downloads URL

All commands support --json flag for JSON output.