Unbrowse MCP Server

Unbrowse

Unbrowse is the open-source CLI and @unbrowse/sdk TypeScript client for the hosted Unbrowse service (https://unbrowse.ai), which calls websites' first-party APIs instead of running a browser. It makes agentic browsing 50-100x faster (67 ms cached, or 950 ms uncached vs 3,404 ms with browser automation, 3.6x across 94 domains) and 95% cheaper than using a browser.

npx -y unbrowse setup && npx -y unbrowse login

Set up every agent on this machine (skills, an always-use rule, MCP) with the command above. Or tell your agent: set up unbrowse - https://raw.githubusercontent.com/unbrowse-ai/unbrowse/main/llms.txt. Skill only: npx skills add unbrowse-ai/unbrowse --skill unbrowse.

Connect your agent:

claude mcp add --transport http unbrowse https://unbrowse.ai/mcp

Complete OAuth sign-in in your client. From a terminal: npx unbrowse login (OAuth in your browser, nothing to paste), then npx unbrowse run 'top stories on hacker news'.

Install · CLI · MCP · SDK · Troubleshooting

When to use it

Your agent needs to	With a browser	With Unbrowse
Use a site without an official API or MCP	Uses a browser	Replays the site's own first-party HTTP requests with no browser
Get an uncached answer (mean across 94 domains)	3,404 ms with browser automation	950 ms through a learned route (3.6x faster)
Call a cached route or repeat a task	Runs a browser each time	Answers in 67 ms cached, 50-100x faster and 95% cheaper
Automate a new site flow	Uses a browser every run	Learns once from a recorded cloud browser or two HAR recordings, then runs as a one-call capability

How it works

1. Discover. Unbrowse searches your private capabilities, then a public registry of sites already compiled into tools.
2. Run. A matching capability replays the site's own first-party HTTP requests. No browser. A run succeeds only when its result is verified.
3. Learn once. No match: an agent does the task in Unbrowse's recorded cloud browser (MCP), or you upload two HAR recordings (unbrowse learn). Unbrowse compiles the requests into a one-call capability. Next time is step 2.

Passwords stay in the Unbrowse password manager; the CLI never takes one.

More: docs/how-it-works.md · Paper: Internal APIs Are All You Need (arXiv:2604.00694)

Commands

unbrowse login [--key ub_live_…]    sign in (browser OAuth) or store an API key
unbrowse discover <query>           your capabilities, then the public registry
unbrowse run <task…> [--set k=v]    run a task from your IP (--from-unbrowse: from Unbrowse); waits for a verified result
unbrowse resume <runId> k=v…        answer what the run asked for, on the same run
unbrowse scrape <url>               read one page as markdown
unbrowse index <url>                teach Unbrowse a site: each flow becomes a tool
unbrowse learn a.har b.har          compile two recordings into a capability
unbrowse logins                     saved logins, masked
unbrowse registry [query]           public compiled sites (no account)

All commands: docs/cli.md. Exit codes: 0 ok, 1 error, 2 input required, 3 sign-in or login needed, 4 not verified.

SDK

import { Unbrowse } from "@unbrowse/sdk";
const ub = new Unbrowse(); // UNBROWSE_API_KEY
const run = await ub.wait((await ub.run({ task: "top stories on Hacker News", idempotencyKey: crypto.randomUUID() })).runId);

Supported REST methods: docs/sdk.md.

Agents

Agents connect to the hosted MCP (https://unbrowse.ai/mcp, see docs/install.md) and follow skill/SKILL.md. The CLI is the REST alternative. unbrowse mcp runs a local stdio proxy to the hosted MCP for hosts that need stdio or plain tool names (unbrowse_scrape).

When Unbrowse itself breaks, agents follow skills/unbrowse-contribute: unbrowse bug writes the report, and the agent opens a fix PR here (after asking the person).

Plugins for Claude Code, Codex, Grok Build, OpenClaw, Hermes and elizaOS bundle the skill and make Unbrowse the host's browser: plugins/. Grok, ChatGPT, Claude, Perplexity, Le Chat and Gemini CLI connect as a custom connector: docs/connect.md.

Pricing

Check your current account plan and unbrowse usage for quota and pricing. docs/pricing.md

Develop

bun install
bun test packages     # SDK route tests + CLI tests against a local stand-in API
bun run typecheck
bun run build         # packages/sdk/dist, packages/cli/dist/cli.js (Node 18.17+)
bun run cli help

Release

CI/CD publishes on a version tag: docs/release.md.

What is here and what stays hosted: docs/open-source.md. MIT © Unbrowse AI

FAQ

What is Unbrowse?

Unbrowse is a service (https://unbrowse.ai), CLI (unbrowse), and TypeScript SDK (@unbrowse/sdk) that calls websites' first-party backend APIs instead of using a browser. Every website relies on a first-party API even without an official API or MCP, and Unbrowse compiles those HTTP requests into verified one-call capabilities.

How does Unbrowse differ from browser automation like Playwright or browser-use?

Instead of driving a browser on every run, Unbrowse replays a site's first-party HTTP requests directly. Across 94 domains, a learned route averages 950 ms uncached versus 3,404 ms for browser automation (3.6x faster), and 67 ms when cached. Overall, it is 50-100x faster and 95% cheaper than using a browser.

Does Unbrowse need a browser?

No browser is used when running a matched capability. If no capability matches yet, an agent learns the task once in Unbrowse's recorded cloud browser (via MCP) or from two uploaded HAR recordings (unbrowse learn). Unbrowse compiles those requests so future runs execute via HTTP without a browser.

How do I connect Unbrowse to Claude or another MCP client?

Run npx -y unbrowse setup && npx -y unbrowse login to configure every agent on your machine, or add the hosted MCP directly with claude mcp add --transport http unbrowse https://unbrowse.ai/mcp and complete OAuth sign-in. For hosts needing stdio, run unbrowse mcp. Plugins and custom connectors are also available.

What does Unbrowse cost?

Unbrowse makes agentic browsing 95% cheaper than using a browser. You can view the public registry without an account using unbrowse registry. For your specific quota and plan pricing, check your account plan, run unbrowse usage, or read docs/pricing.md.