Browserless CLI for AI Agents

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Introduction

CLIs are eating MCPs. The industry is converging on the very same idea. MCPs for all their merit can be token hungry, slow, and unreliable for complex tool chaining. However, coding agents have become incredibly good at working with CLIs, and in fact they are far more comfortable working with CLI tools than MCP.

With Composio's Universal CLI, your coding agents can talk to over 850+ SaaS applications. With Browserless, agents can download all invoices from your dashboard, extract product details from a competitor's site, take a screenshot of your homepage after login, and more — all without worrying about authentication.

This guide walks you through Composio Universal CLI and explains how you can connect it with coding agents like Claude Code, Codex, OpenCode, etc, for end-to-end Browserless automation.

Also integrate Browserless with

What is Universal CLI and why use it?

The idea behind building the universal CLI is to give agents a single command interface to interact with all your external applications. Here's what you'll get with it:

  • Agent-friendly: Coding agents like Claude Code, Codex, and OpenCode can use CLI tools natively — no MCP setup required.
  • Authentication handled: Connect once via OAuth or API Key, and all CLI commands work with your credentials automatically.
  • Tool discovery: Search, inspect, and execute 20,000+ tools across 850+ apps from one interface.
  • Trigger support: Use triggers to listen for events across your apps, powered by real-time webhooks or polling under the hood.
  • Type generation: Generate typed schemas for autocomplete and type safety in your projects.

Prerequisites

Install the Composio CLI, authenticate, and initialize your project:

bash
# Install the Composio CLI
curl -fsSL https://composio.dev/install | bash

# Authenticate with Composio
composio login

During login you'll be redirected to sign in page, finish the complete flow and you're all set.

Composio CLI authentication flow

Connecting Browserless to Coding Agents via Universal CLI

Once it is installed, it's essentially done. Claude Code, Codex, OpenCode, OpenClaw, or any other agent will be able to access the CLI. A few steps to give agents access to your apps.

  1. Launch your Coding Agent — Claude Code, Codex, OpenCode, anything you prefer.
  2. Prompt it to "Authenticate with Browserless"
  3. Complete the authentication and authorization flow and your Browserless integration is all set.
  4. Start asking anything you want.

Supported Tools & Triggers

Tools
Download file using Puppeteer scriptThis tool allows downloading files that chrome has downloaded during the execution of puppeteer code.
Execute Custom FunctionA tool that allows executing custom puppeteer scripts via http requests.
Fetch HTML ContentThis tool fetches the complete html content of a webpage using browserless's content api.
Generate PDF from webpageThis tool generates a pdf from a specified webpage using browserless's pdf generation api.
Scrape webpage content using CSS selectorsA tool to extract structured content from a webpage by specifying css selectors.
Take ScreenshotA tool that captures a screenshot of a webpage using browserless's screenshot api.
Unblock Protected ContentThis tool provides access to content from websites that implement bot protection mechanisms.

Universal CLI Commands for Browserless

You can also manually execute CLI commands to interact with your Browserless.

Connect your Browserless account

Link your Browserless account and verify the connection:

bash
# Connect your Browserless account (opens OAuth flow)
composio connected-accounts link browserless

# Verify the connection
composio connected-accounts list --toolkits browserless

Discover Browserless tools

Search and inspect available Browserless tools:

bash
# List all available Browserless tools
composio tools list --toolkit browserless

# Search for Browserless tools by action
composio tools search "browserless"

# Inspect a tool's input schema
composio tools info BROWSERLESS_DOWNLOAD_FILE

Common Browserless Actions

Download file using Puppeteer script — This tool allows downloading files that chrome has downloaded during the execution of puppeteer code

bash
composio tools execute BROWSERLESS_DOWNLOAD_FILE \
  --code "export default async function ({ page }) {                 await page.evaluate(() => {                     const json = {                         ping: "pong",                         rnd: [...Array(5)].map(() => Math.random()),                     };                     const jsonContent = `data:application/json,${JSON.stringify(json)}`;                     const encodedUri = encodeURI(jsonContent);                     const link = document.createElement("a");                     link.setAttribute("href", encodedUri);                     link.setAttribute("download", "data.json");                     document.body.appendChild(link);                     link.click();                 });             }"

Execute Custom Function — A tool that allows executing custom puppeteer scripts via http requests

bash
composio tools execute BROWSERLESS_EXECUTE_CUSTOM_FUNCTION \
  --code "export default async function ({ page, context }) {                 await page.goto(context.url);                 const title = await page.title();                 return {                     data: { title },                     type: 'application/json'                 };             }"

Fetch HTML Content — This tool fetches the complete html content of a webpage using browserless's content api

bash
composio tools execute BROWSERLESS_FETCH_HTML_CONTENT \
  --url "https://example.com"

Generate PDF from webpage — This tool generates a pdf from a specified webpage using browserless's pdf generation api

bash
composio tools execute BROWSERLESS_GENERATE_PDF \
  --url "https://example.com" \
  --html "<h1>Hello World</h1>" \
  --options "<object>" \
  --addStyleTag "<array>"

Generate Type Definitions

Generate typed schemas for Browserless tools to get autocomplete and type safety in your project:

bash
# Auto-detect language
composio generate --toolkits browserless

# TypeScript
composio ts generate --toolkits browserless

# Python
composio py generate --toolkits browserless

Tips & Tricks

  • Always inspect a tool's input schema before executing: composio tools info <TOOL_NAME>
  • Pipe output with jq for better readability: composio tools execute TOOL_NAME -d '{}' | jq
  • Set COMPOSIO_API_KEY as an environment variable for CI/CD pipelines
  • Use composio dev logs tools to inspect execution logs and debug issues

Next Steps

  • Try asking your coding agent to perform various Browserless operations
  • Explore cross-app workflows by connecting more toolkits
  • Set up triggers for real-time automation
  • Use composio generate for typed schemas in your projects

How to build Browserless MCP Agent with another framework

OpenAI Agents SDK

OpenAI Agents SDK

Use Browserless MCP with OpenAI Agents SDK

Claude Agent SDK

Claude Agent SDK

Use Browserless MCP with Claude Agent SDK

Claude Code

Claude Code

Use Browserless MCP with Claude Code

Codex

Codex

Use Browserless MCP with Codex

OpenClaw

OpenClaw

Use Browserless MCP with OpenClaw

Google ADK

Google ADK

Use Browserless MCP with Google ADK

LangChain

LangChain

Use Browserless MCP with LangChain

Vercel AI SDK

Vercel AI SDK

Use Browserless MCP with Vercel AI SDK

Mastra AI

Mastra AI

Use Browserless MCP with Mastra AI

LlamaIndex

LlamaIndex

Use Browserless MCP with LlamaIndex

CrewAI

CrewAI

Use Browserless MCP with CrewAI

FAQ

What is the Composio Universal CLI?

The Composio Universal CLI is a single command-line interface that lets coding agents and developers interact with 850+ SaaS applications. It handles authentication, tool discovery, action execution, and trigger setup — all from the terminal, without needing to configure MCP servers.

Which coding agents work with the Composio CLI?

Any coding agent that can run shell commands works with the Composio CLI — including Claude Code, Codex, OpenCode, OpenClaw, and others. Once the CLI is installed, agents automatically discover and use the composio commands to interact with Browserless and other connected apps.

How is the CLI different from using an MCP server for Browserless?

MCP servers require configuration and can be token-heavy for complex workflows. The CLI gives agents a direct, lightweight interface — no server setup needed. Agents simply call composio commands like any other shell tool. It's faster to set up, more reliable for multi-step tool chaining, and works natively with how coding agents already operate.

How safe is my Browserless data when using the Composio CLI?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Browserless data and credentials are handled as safely as possible. You can also bring your own OAuth credentials for full control.

Used by agents from

Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai
Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai
Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai

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