Send print jobs to cloud-connected printers, track their state, read scales and manage webhooks with PrintNode.
PrintNode ships in the w6w first-party pack. It declares 18 actions, 3 health checks, and the host runs its code in a sandbox that never sees the credential.
io.w6w.printnodePrintNode connects printers to the internet: install the PrintNode Client on a computer and every printer attached to it becomes addressable through one API. This app lets a workflow print a PDF or raw printer data (labels, receipts, barcodes) to any of those printers, from a URL or as base64 content, with the usual print options such as copies, duplex, paper size, tray and page ranges.
Beyond printing it covers the whole job lifecycle: list and look up print jobs, read their full state history (new, sent to client, done, error, expired), and cancel jobs that have not yet reached the client. It also lists the computers and printers on the account, including each printer’s capabilities, reads live weight readings from attached USB scales, and manages the webhooks PrintNode uses to push computer and print job state changes.
The app keeps two vendor quirks out of your way: PrintNode returns a webhook’s shared secret in clear on every read, and the app removes it before a result is stored; and the bulk delete forms that would remove every computer or every print job are never built, so a missing id cannot wipe an account.
Three routes to the same 18 actions. The Workflow tab is generated from PrintNode's own manifest and carries its real ids, so it is copy-pasteable; the Code and CLI examples are the same call for any action on any app, so every app-specific value in them is a blank you fill in.
computer-delete Remove one or more computers from the account. Returns the ids removed.
computer-get Fetch one or more computers by id. Always returns a list, even for one id.
printer-get Fetch one or more printers by id, including their capabilities. Returns a list.
printer-printjobs-cancel Cancel all undelivered print jobs on given printers, or only the listed jobs.
printjob-create Send a PDF or raw document to a printer. Returns the new print job id.
printjob-states-list Read the state history of print jobs (new, sent_to_client, done, error, expired).
scale-get Read the latest weight from one scale, identified by device name and number.
scale-list Read the most recent weight readings from scales attached to a computer.
A workflow step names the app and the action, and the editor fills in the
connection when you pick one. This is the Step shape from the
workflow spec, carrying PrintNode's real ids.
{
"manifestVersion": "2",
"name": "printnode-example",
"steps": [
{
"id": "computer-get",
"uses": {
"app": "io.w6w.printnode",
"action": "computer-get",
"connection": "conn_YOUR_CONNECTION_ID"
},
"with": {
"computerIds": "<computerIds>"
}
}
]
}computer-get account-get computer-list printer-get printer-list +13 more actions available
Every app-specific value here is a blank you have to fill in. An
app action is reached through the connection that authenticates it, so the
address is a connection id, not the app id — and connections belong to your account,
so a public page cannot know yours. Create one for PrintNode, then fill in
the three blanks: conn_YOUR_CONNECTION_ID, the action key, and the
parameters that action declares. The call itself is real — the shape is transcribed
from the studio's own snippet builder, which prints the same kind of blanks — but
nothing in it is specific to PrintNode. The Workflow tab is where this app's
real ids are.
npm install @w6w/sdkyarn add @w6w/sdkpnpm add @w6w/sdkdeno add npm:@w6w/sdkimport { W6wClient, isActionRun } from "@w6w/sdk";
// Reads W6W_BASE_URL and W6W_TOKEN from the environment when omitted.
const client = new W6wClient();
const envelope = await client.run({
urn: "conn_YOUR_CONNECTION_ID",
action: "computer-get",
payload: {
computerIds: "<value>",
// limit: "<value>",
// after: "<value>",
// dir: "<value>",
},
});
if (isActionRun(envelope)) console.log(envelope.value); npm install -g @w6w/cli w6w run conn_YOUR_CONNECTION_ID --action computer-get --payload '{"computerIds":"<value>"}' Give an AI agent PrintNode — without giving it PrintNode's credentials. One MCP endpoint exposes every app, function and workflow the caller is entitled to, as tools it can discover and run. Access is granted per team while we onboard.
One tool call{
"name": "w6w_invoke",
"arguments": {
"ref": "app:io.w6w.printnode#computer-get",
"input": {
"computerIds": "<computerIds>"
}
}
}
Every tool names its target with a single ref. The
app: form above doesn't name a connection at all — the
host resolves which of the caller's PrintNode connections to sign
with, and refuses rather than guesses when the answer is ambiguous.
The token is attached host-side, at the moment of the call. It is never a tool argument, never in the model's context, and never in a transcript — so a prompt injection has nothing to exfiltrate.
Tools are derived per end user from what that person has actually connected and is entitled to — not one shared bot identity carrying the union of everyone's access.
Multi-step work runs on the workflow engine and returns a run handle the agent can poll — retries, branching and state survive the conversation that started them.
PrintNode's declared health checks are on the surface too, so an agent can tell "the vendor is down" from "your credential expired" before it burns a retry on either.
The MCP surface is part of the hosted platform. PrintNode itself is MIT, and the runtime that executes it is source-available (FSL).
PrintNode declares its own checks, so its health is a property of the app rather than something the host guesses at.
Unauthenticated GET https://api.printnode.com/ping. The JSON string "OK" passes. Credential validity is the derived `auth:*` check's job.