leapfrog
Multi-session browser MCP for AI agents. 19 tools. 15 parallel sessions. Up to 10x fewer tokens.
Multi-session browser automation MCP server with stealth capabilities, supporting up to 15 parallel sessions with 10x token efficiency compared to traditional browser automation tools.
About leapfrog
leapfrog is a community-built MCP server published by anthonybono21-cloud that provides AI assistants with tools and capabilities via the Model Context Protocol. Multi-session browser MCP for AI agents. 19 tools. 15 parallel sessions. Up to 10x fewer tokens. It is categorized under productivity. This server exposes 19 tools that AI clients can invoke during conversations and coding sessions.
How to install
You can install leapfrog in your AI client of choice. Use the install panel on this page to get one-click setup for Cursor, Claude Desktop, VS Code, and other MCP-compatible clients. This server runs locally on your machine via the stdio transport.
License
leapfrog is released under the MIT license. This is a permissive open-source license, meaning you can freely use, modify, and distribute the software.
Tools (19)
Open a new isolated browser session with separate cookies and state
Close a browser session and free the slot
List all active browser sessions with URLs and idle times
Save authentication state to disk for future sessions
List saved authentication profiles
Leapfrog
Multi-session browser MCP for AI agents.
21 tools. 15 parallel sessions. Stealth. Humanization. Up to 10x fewer tokens.
npm i leapfrog | Works with Claude Code, Cursor, Windsurf
The Problem
Playwright MCP sends ~14,000 tokens for a content-heavy page like Hacker News. Most of that is noise. Your context window fills up. Your agent gets confused. You pay for it.
Leapfrog sends ~1,400 tokens. Same page. Same information. Up to 10x less noise.
┌─────────────────────────────────────────────────────┐
│ Playwright MCP │
│ ████████████████████████████████████████ ~14,000 │
│ │
│ Leapfrog │
│ █████ ~1,400 │
└─────────────────────────────────────────────────────┘
tokens per page (Hacker News, real test)
Savings range from 2-10x depending on page complexity. Content-heavy pages see the biggest wins. Dense forms see the smallest. The median across real-world sites is ~4-5x.
Quick Start
npx leapfrog --doctor # verify everything works
npx leapfrog --config # print MCP config to paste
Add to ~/.mcp.json (Claude Code) or your editor's MCP config:
{
"leapfrog": {
"command": "npx",
"args": ["-y", "leapfrog"],
"env": {
"LEAP_MAX_SESSIONS": "15"
}
}
}
Chromium installs automatically. If it fails: npx playwright install chromium
Feature Matrix
| Leapfrog | Playwright MCP | agent-browser | |
|---|---|---|---|
| Tokens per page | ~1,200-2,500 | ~3,800-15,000 | ~300 |
| Parallel sessions | 15 | 1 | 1 |
| Session isolation | Yes | No | No |
| Multi-tab / popups | Yes | No | No |
| Network intercept | Yes | No | No |
| Console capture | Yes | Yes | No |
| Stealth / anti-bot | Yes | No | No |
| Smart wait (5 types) | Yes | Basic | No |
| Crash recovery | Yes | No | No |
| Auth profile reuse | Yes | No | No |
| SSRF protection | Yes | No | No |
The Ecosystem
Leapfrog uses pond metaphors to keep things memorable. Your agent is the frog.
| Concept | Leapfrog term | What it means |
|---|---|---|
| Sessions | Ponds | Isolated browser contexts — cookies, storage, state |
| Tabs | Lily pads | Where the frog lands within a pond |
| Navigate | Leap | Jump to a URL, get a compact snapshot back |
| Snapshots | Surface | What you see on the surface — interactive @eN refs |
| Network traffic | Ripple | HTTP requests flowing under the surface |
| Console errors | Croak | Something went wrong in the browser |
| Stealth mode | Camouflage | Anti-bot evasion patches |
All 19 Tools
Pond Management (7)
| Tool | What it does |
|---|---|
session_create | Open a new pond — isolated cookies, state, viewport |
session_destroy | Drain a pond and free the slot |
session_list | See all active ponds with URLs and idle times |
session_save_profile | Save auth state to disk for future ponds |
session_list_profiles | List saved auth profiles |
pool_status | Pool stats, memory, uptime |
session_health | Is the pond healthy? Browser connected, page responsive? |
Navigation & Snapshots (6)
| Tool | What it does |
|---|---|
navigate | Leap to a URL, return a compact @eN snapshot |
snapshot | Re-read the surface (scope with CSS selector) |
act | Click, fill, type, check, select, press, scroll, hover, back, forward |
wait_for | Wait for element / text / network idle / navigation / JS expression |
screenshot | Capture PNG (full page or element) |
extract | Pull text, HTML, title, URL, or evaluate JS |
Tab Management (3)
| Tool | What it does |
|---|---|
tabs_list | List all pads in a pond |
tab_switch | Hop to another pad (-1 for most recent popup) |
tab_close | Close a pad (can't close the last one) |
Network Intelligence (3)
| Tool | What it does |
|---|---|
network_log | See HTTP traffic — filter by URL, method, status, content-type |
console_log | Read browser console output, filtered by level |
network_intercept | Block, mock, or log requests by URL pattern |
Environment Variables
| Variable | Default | Description |
|---|---|---|
LEAP_MAX_SESSIONS | 15 | Max concurrent sessions |
LEAP_IDLE_TIMEOUT | 300000 | Session idle timeout in ms (5 min) |
LEAP_HEADLESS | true | Set false to watch the browser |
LEAP_ALLOW_JS | true | Allow JS evaluation in extract and wait_for |
LEAP_STEALTH | true | Stealth mode (anti-bot evasion) |
LEAP_LOG_LEVEL | info | debug / info / warn / error |
Tests
74 passing across 5 suites
Session management, snapshot engine, network intelligence, tab management, security (SSRF, URL scheme blocking, path traversal).
npm test
Requirements
- Node.js >= 18
- Chromium (auto-installed via Playwright)
License
MIT
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