Give web apps
agent tools.

ToolGraft lets your coding agent build reusable WebMCP tools for the websites you use, then call them in the browser session you're already signed in to. Free and open source.

Install Try the demo ↘

Interactive simulation with synthetic mail. No extension or email access is used in this demo.

mail.example.com
simulated demo
MailboxLV
Maya ChenAdapter review and next steps
Build BotCI passed on pull request #18
Leo MartinsWebMCP notes from Tuesday
ParticularWeekly project snapshot
Tools

Mailbox

v0.4.1
ready

Your agent builds the adapter.

01

Inspect

The agent uses the live site and learns the flow.

02

Build

It writes an adapter, installs it locally, and runs the tool.

03

Use

Keep the tested version. Updates install only when you approve them.

The agent stays outside the extension.

The extension installs adapters, checks permissions, and exposes their tools. Your agent writes the code through one MCP package. ToolGraft has no AI of its own and no account.

Coding agentClaude, Codex, or whatever you use
ToolGraft MCPWrite, install, test, repair
ExtensionRuntime and permissions
WebsiteWebMCP tools in the current tab

Install in
two steps.

One Chrome extension and one npm package for Claude Code, Codex, Cursor or any local MCP agent. Needs Chrome 138+ and Node 24+. No account, no model key.

01Add the extension

Download for Chrome

Unzip it, open chrome://extensions, turn on Developer mode, choose Load unpacked, then turn on Allow User Scripts in ToolGraft’s Details. Chrome Web Store listing coming soon.

02Add the MCP to your agent

See Get started for your agent’s setup.

Then ask your agent: “Connect to ToolGraft.” Approve the connection in the extension.

Full setup guide · GitHub · npm