Internal ops · Workflow template

Custom API endpoint backed by a workflow

Expose a webhook URL that runs an AI step over the request and returns a custom response.

Build this in Carly Or copy the prompt ↓

The workflow at a glance

Trigger

Webhook received

POST

LLM

Respond

How this workflow works, step by step

1 Trigger Webhook received

Any system that can POST to a URL kicks this off — webhook received. Carly accepts the payload and starts the workflow.
2 LLM Respond

An LLM step does the thinking: respond. Carly picks the right model for the job and you can swap models per step if you need to.

When to use this template

You want this work to happen consistently without anyone remembering to do it.
You're already using tools Carly connects to, and the manual version of this is eating real minutes a week.
You want a visible canvas you can audit and edit — not a black-box agent doing things you can't see.

When not to use it

This task only happens once or twice a month — the setup cost won't pay back.
The decision in the middle of the flow needs human judgment every single time, not just on edge cases.
Your stack doesn't include any of the apps above and you don't want to wire a generic HTTP step.

Build it in 10 minutes — copy this prompt

Paste this in an email to and Carly will build the workflow for you.

Hey Carly — set up the "Custom API endpoint backed by a workflow" template for me and turn it on once it's working. If you need any details from me (like which sender, folder, or channel), just ask. Thanks!

Or open the dashboard →

Questions teams ask before building this

How long does this workflow take to set up?

Most teams have "Custom API endpoint backed by a workflow" running in under 10 minutes. Copy the prompt on this page into an email to carly@usecarly.com and Carly wires the workflow together for you, including authenticating the tools you need.

Can I edit this template after Carly builds it?

Yes. Every workflow lives on the Carly canvas where you can rename steps, change conditions, swap LLM models, add filters, and re-route branches. Templates are starting points, not locked recipes.

What if I use a different tool than the ones in this template?

Carly connects to 200+ tools, plus a generic HTTP node for any API that doesn't have a native integration. Tell Carly your stack when you send the prompt and she'll pick the right connectors.

Does this run automatically once it's built?

Yes. The trigger at the start of the workflow fires automatically — on a schedule, on an inbound email, on a webhook, on a calendar event, whatever this template specifies. Carly handles the listening; you only step in when a step is gated on you.

Does this workflow cost anything to run?

Running the workflow itself — triggers, tool calls, branches, filters, waits — is free with no per-task fees. You only pay for the AI steps in this template (the LLM nodes that classify, write, or decide). Everything around them runs at no cost.