three.ws Knock

Name: three.ws Knock
Author: nirholas

by nirholasversion 0.1.0i★ –iRuns on your computer

Registry nameio.github.nirholas/knock-mcp

Install

Overview

Description from the maker (original English)

Reach a real person: quote their door, browse who is reachable, knock, and read the reply.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other
You need to fill in: THREE_WS_API_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: THREE_WS_API_KEY, THREE_WS_BASE, THREE_WS_TIMEOUT_MS

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "knock": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/knock-mcp"
      ],
      "env": {
        "THREE_WS_API_KEY": "your-value",
        "THREE_WS_BASE": "your-value",
        "THREE_WS_TIMEOUT_MS": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add knock --env THREE_WS_API_KEY=your-value --env THREE_WS_BASE=your-value --env THREE_WS_TIMEOUT_MS=your-value -- npx -y @three-ws/knock-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "knock": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/knock-mcp"
      ],
      "env": {
        "THREE_WS_API_KEY": "your-value",
        "THREE_WS_BASE": "your-value",
        "THREE_WS_TIMEOUT_MS": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "knock": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/knock-mcp"
      ],
      "env": {
        "THREE_WS_API_KEY": "your-value",
        "THREE_WS_BASE": "your-value",
        "THREE_WS_TIMEOUT_MS": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

THREE_WS_API_KEY secret env
A three.ws API key (sk_live_… / sk_test_…) or OAuth access token. Optional: needed only for knock_inbox and knock_act, which manage your own door. Quoting, browsing, knocking and reading a receipt al…
THREE_WS_BASE env
Base URL of the three.ws API. Override only when self-hosting or targeting a preview deployment.
THREE_WS_TIMEOUT_MS env
Per-request timeout in milliseconds.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account nirholas, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32545 servers in this category
Published to the registry more recently than 52% of the other 32545 servers in this category
Basic checks equal to or better than 100% of the other 32545 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is three.ws Knock safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: THREE_WS_API_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.0) reached the registry 37 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Python MCP

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

@three-ws/knock-mcp

Let an agent reach a real person.

Knock is a priced door to a human. Every three.ws account can publish one at three.ws/knock/ , and the owner sets what one message from a stranger costs. Paying that price buys exactly one message through: it lands in their inbox, and their 3D companion walks on screen wherever they are on the site and delivers it out loud, naming the sender and the amount. The USDC settles directly to the recipient.

This MCP server gives any agent client (Claude Code, Claude Desktop, Cursor, Windsurf, or your own) the tools to find a reachable person, knock, and read the answer.

This server holds no wallet

On a free door, knock_send sends immediately, because nothing moves.

On a priced door, knock_send does not pay and cannot pay. It returns the recipient, the amount, the token, the chain and the endpoint, and stops. The human approves the spend and pays from the wallet they already control, with @three-ws/knock or any other x402 client.

That is deliberate. An MCP server with a key in an environment variable should not be able to move a person's money on its own.

Install

Claude Code:

claude mcp add knock -- npx -y @three-ws/knock-mcp

Any MCP client, by config:

"mcpServers": { "knock": { "command": "npx", "args": ["-y", "@three-ws/knock-mcp"] } } }

Add THREE_WS_API_KEY only if you also want the two owner-side tools:

"mcpServers": { "knock": { "command": "npx", "args": ["-y", "@three-ws/knock-mcp"], "env": { "THREE_WS_API_KEY": "sk_live_…" } } } }

Node 20+.

Tools

Tool	Credential	What it does
`knock_quote`	none	What one person charges for a single message, which chains they take it on, the length limit, and the endpoint.
`knock_directory`	none	Everyone reachable right now, cheapest first.
`knock_send`	none	Get one message through. Free doors send; priced doors are quoted for a human to approve.
`knock_receipt`	none	What became of a knock you sent: pending, read, replied (with the reply), or dismissed.
`knock_inbox`	`THREE_WS_API_KEY`	The knocks your door has taken, each with what the sender paid, plus totals.
`knock_act`	`THREE_WS_API_KEY`	Reply to, mark read, dismiss, or block one of them.

The owner tools are account-scoped server-side. They can never read or change another account.

What a session looks like

You: Find someone on three.ws who takes questions about x402, and ask them

how their Solana facilitator handles fee payers.

The agent calls knock_directory, picks a door, calls knock_quote to get the live price, and comes back with:

nirholas (@nirholas) charges $0.05 USDC on solana.

Endpoint: https://three.ws/api/x402/knock?to=nirholas The payment settles directly to the recipient. Approve?

You approve and pay from your own wallet:

npx @three-ws/knock send nirholas \

"How does your Solana facilitator handle the fee payer?" \ --from "Ada (research agent)" --subject "x402 fee payer" --payer ./payer.mjs

Their companion walks on screen and says: *"Ada paid $0.05 to reach you: x402 fee payer."* When they answer, the agent reads it back with knock_receipt on the receipt URL. No account on either side beyond the door owner's.

Environment

Variable	Required	Default	Purpose
`THREE_WS_API_KEY`	for `knock_inbox` / `knock_act` only	none	API key or OAuth token for the account whose door you manage. Aliases: `THREE_WS_TOKEN`, `THREE_WS_BEARER`.
`THREE_WS_BASE`	no	`https://three.ws`	Override only when self-hosting.
`THREE_WS_TIMEOUT_MS`	no	`20000`	Per-request timeout.

Run and inspect

node src/index.js                     # stdio

npm run inspect # MCP Inspector npm test # the tool surface and the no-wallet rule

[@three-ws/knock](https://www.npmjs.com/package/@three-ws/knock) is the SDK and CLI that actually pays.
[three.ws/knock](https://three.ws/knock) to open your own door.
[Knock docs](https://three.ws/docs/knock) for the protocol and the wire format.

License

Apache-2.0

three.ws Knock

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Python MCP

README from the maker

@three-ws/knock-mcp

This server holds no wallet

Install

Tools

What a session looks like

Environment

Run and inspect

Related

License