Send SMS, MMS, voice calls and transactional email, and manage contact lists, via ClickSend.
ClickSend ships in the w6w first-party pack. It declares 16 actions, 2 health checks, and the host runs its code in a sandbox that never sees the credential.
io.w6w.clicksendClickSend puts several outbound communication channels behind one account and one credential, and this app covers the ones a workflow is most likely to reach for: SMS, MMS, voice calls and transactional email, plus the contact lists that feed them.
Every send reports back what it actually cost — message parts, price, and per-recipient delivery status — so a workflow can see whether a longer message quietly split into extra billed segments, or whether one recipient in a batch failed while the rest went through, rather than assuming a single message and a single price for every send. Voice messages are read from text with a selectable language and voice, and a companion action lists which pairings ClickSend actually supports before a call is placed.
Bulk and campaign-oriented sending, fax, physical mail, and account administration aren’t part of this app — it stays focused on sending a message and knowing what happened to it, and reading and building the contact lists a workflow sends to.
Three routes to the same 16 actions. The Workflow tab is generated from ClickSend'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.
account-usage-get Get per-channel usage and spend for a calendar month (GET /account/usage/{year}/{month}/subaccount).
contact-create Add a contact to a Contact List (POST /lists/{list_id}/contacts). At least one of Phone, Fax or Email is required.
countries-list List the ISO 3166 alpha-2 country codes ClickSend recognizes (GET /countries). Public — no Connection required.
email-address-list List verified sender addresses for Send Transactional Email (GET /email/addresses).
mms-history-list List sent/received MMS history (GET /mms/history), newest activity first.
sms-cancel Cancel a scheduled SMS before it sends (PUT /sms/{message_id}/cancel).
sms-history-list List sent/received SMS history (GET /sms/history), newest activity first.
voice-cancel Cancel a scheduled voice call before it's placed (PUT /voice/{message_id}/cancel).
voice-languages-list List the language codes and supported genders for Send Voice Call (GET /voice/lang).
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 ClickSend's real ids.
{
"manifestVersion": "2",
"name": "clicksend-example",
"steps": [
{
"id": "contact-create",
"uses": {
"app": "io.w6w.clicksend",
"action": "contact-create",
"connection": "conn_YOUR_CONNECTION_ID"
},
"with": {
"listId": "<listId>"
}
}
]
}contact-create account-get account-usage-get contact-list-create contact-list-list +11 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 ClickSend, 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 ClickSend. 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: "contact-create",
payload: {
listId: "<value>",
// phoneNumber: "<value>",
// faxNumber: "<value>",
// email: "<value>",
// firstName: "<value>",
// lastName: "<value>",
// organizationName: "<value>",
// custom1: "<value>",
// custom2: "<value>",
// custom3: "<value>",
// custom4: "<value>",
// addressLine1: "<value>",
// addressLine2: "<value>",
// addressCity: "<value>",
// addressState: "<value>",
// addressPostalCode: "<value>",
// addressCountry: "<value>",
},
});
if (isActionRun(envelope)) console.log(envelope.value); npm install -g @w6w/cli w6w run conn_YOUR_CONNECTION_ID --action contact-create --payload '{"listId":"<value>"}' Give an AI agent ClickSend — without giving it ClickSend'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.clicksend#contact-create",
"input": {
"listId": "<listId>"
}
}
}
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 ClickSend 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.
ClickSend'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. ClickSend itself is MIT, and the runtime that executes it is source-available (FSL).
ClickSend declares its own checks, so its health is a property of the app rather than something the host guesses at.
Atlassian Statuspage rollup for status.clicksend.com, weighted on the REST API component, with per-channel detail (SMS/MMS/Voice/Fax/Email). Unauthenticated and unsigned.
Per-account request rate limit, read from the x-ratelimit-* response headers on the account usage call (undocumented but present on every ClickSend response).