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Beyond the Prompt: Why AI-Built Workflows Fai, by Mariela Slavenova, CEO, Marinext AI

Beyond the Prompt: Why AI-Built Workflows Fail (And What My HARDEN™ Method Taught Me About Making Them Work)

If you’re in my line of work, you’ve seen the hype. 

Every day, there’s a new video or a new post claiming, “AI can build your workflows now!”

You see these demos where someone gives a tool like ChatGPT a single prompt, such as “Create a Make.com flow for content generation”, “Build me a Zapier automation to handle new leads”, “Make me an n8n workflow that will extract leads from LinkedIn”, etc. 

In seconds, a beautiful diagram appears, a perfect-looking sequence of steps, and everyone is amazed.

As the CEO of an AI automation agency, I have to be honest with you: 

That’s not a workflow. 

That’s a wireframe.

It’s a picture of a workflow. 

It’s a blueprint for a house. It is not a house.

The moment you try to run that AI-generated flow, the moment you add any real-world complexity, the whole thing falls apart. 

Why? 

Because the AI builds the steps, but it completely misses the whole picture.

This is exactly why I built my entire business philosophy around our HARDEN™ Method

We have a dedicated “Break” phase in which we intentionally try to break every automation we build. Because we know, from painful, real-world experience, that a flow that hasn’t been stress-tested is a flow that’s guaranteed to fail.

In this article, I aim to expose the illusion of the “AI workflow.” 

I’ll show you exactly why these AI-generated diagrams fail, what they’re missing, and what it really takes to build an automation that doesn’t just look good, but actually works, scales, and delivers real results for your business.


A quick note before we continue: Throughout this article, when I refer to “AI,” I mean workflows built using prompts in large language models (LLMs) like ChatGPT, Claude, Gemini, Manus, etc.


The Great Illusion: A Blueprint for a House vs a Finished Home

In my articles, I often use a house-building analogy when explaining what a “Process Design Document” (PDD) is. 

The same analogy is perfect here.

Giving AI a prompt to build a workflow is like asking an architect for a floor plan. The AI will provide you with a beautiful drawing. 

It shows a “New Email” trigger (the front door) connected to a “Parse Data” module (the hallway), which leads to a “Create Invoice” module (the kitchen). It looks perfect.

But what the AI doesn’t draw is the reality of the house:

  • It doesn’t include the plumbing. What if the data isn’t clean? The pipes will back up.
  • It doesn’t include the electrical wiring. What if the data format is wrong? The lights won’t turn on.
  • It doesn’t include the foundation. What if the API connection fails? The whole house will collapse.

The AI-generated “flow” looks functional, but it’s a prop. 

It’s a movie set. 

The moment you try to live in it, for example, by sending it an email that has a slightly different subject line, or a PDF attachment instead of text, the walls fall down.

In my business, we build systems that our clients bet their operations on. 

A “movie set” isn’t an option. 

We need a real, functioning, robust home. 

That means we have to build the plumbing, the wiring, and the foundation ourselves.

Why AI Fails: It Builds Steps, Not a System

The core problem is this: 

Automation isn’t about tools; it’s about understanding a system’s behavior. 

AI, in its current form, is a master of patterns, not logic.

It can generate code that looks right, but it doesn’t “know” what it’s doing. 

It doesn’t understand the why behind the connections.

It sees: Step 1 → Step 2 → Step 3

It misses the reality, which is: 

Step 1 → (Wait, IS THE DATA FROM STEP 1 GOOD?) → (OK, IT IS. NOW, CHANGE IT TO FIT STEP 2)

→ Step 2 → (DID STEP 2 WORK?) → (NO? OK, TRY AGAIN 3 TIMES) 

→ Step 3 → etc.

This is what I call the “in-between” logic, and it’s where 99% of AI-built workflows die.

Missing Piece 1: The “In-Between” Logic (Filters)

AI is a people-pleaser. 

It connects everything. But the most essential part of a real workflow is telling it what not to do.

Simple Example: 

Let’s say you want to automate new leads. 

Your trigger is “New Email in sales@company.com”. 

The AI happily connects this trigger to your CRM.

The Failure: 

The system goes live. 

But what about spam? 

What about newsletters? 

What about internal test emails? 

The flow worked, but the system is a disaster.

The Human Fix: 

A human-led design, like in our “Design” phase, doesn’t just connect A to B. 

We build conditional filters

We add a step that says: 

“STOP. Before you continue, check the email. Does the body contain the word ‘unsubscribe’? 

If YES, stop the flow. Is the sender’s email from ‘@company.com’? 

If YES, stop the flow.” 

And so on. 

And this is just a basic example. We can continue creating internal folders, adding labels to emails, and more. 

“If there is a keyword “invoice” in the email subject, put a label “Invoice” and send an email to invoice@company.com.”

This conditional logic is the most basic, essential part of an automation, and AI almost never includes it.

Missing Piece 2: The Data-Language Barrier (JSON, Arrays, and Functions)

This part sounds technical, but it’s simple. 

Every application speaks a different “language.” 

The data from one tool almost never fits perfectly into the next.

AI is a terrible translator. 

It just assumes that “a date is a date” or “a name is a name.” 

This is where things really break.

The Real-World Problems AI Can’t Predict (And Why We Have a “Break” Phase)

The world is messy. 

Things go offline. 

Services get busy. 

An AI builds a workflow for a “perfect day” where everything works. If it can actually make one from start to finish…

This is why our HARDEN™ Method has a “Break” phase. 

We don’t ask “what if it fails?” 

We make it fail, so we can build a system that knows how to recover.

API Limits and the “Wait, There’s More” Problem

When you ask an application (an API) for data, it rarely gives you everything at once. 

If you have 5,000 customer records, the API will give you a “box” of the first 100 and say, “That’s page 1. Come back if you want page 2.” This is called pagination.

The AI Failure: 

The AI-built flow makes a request. 

It gets the first 100 records (page 1), thinks “Job done!”, and moves on. Your workflow “succeeds,” but it has only processed 2% of your data.

The Human Fix: 

We have to build a loop

We design the flow to check the API’s response. 

We ask: “Did you mention a ‘page 2’ or a ‘next_page_token’?” 

If YES, the flow loops back, makes another request for page 2, and adds those 100 records. It keeps doing this until the API says, “There are no more pages.” 

This is a complex, robust design that AI cannot guess.

Error Recovery: What Happens When the System Sneezes?

Sometimes, things fail. 

A server is busy. 

The network hiccups. 

Google Sheets is temporarily down for 20 seconds.

The AI Failure: 

The AI’s flow tries to connect to Google Sheets at that exact second. It gets an error. 

The entire workflow stops, crashes, and is marked “Failed.” 

You lose the lead data and don’t even know it until hours later.

The Human Fix: 

This is the “Harden” phase of our method. 

We build error recovery and retry handling into every single step. 

We tell the system,

If you get an error from Google Sheets, do not panic. Wait 60 seconds, then try again. If it fails a second time, wait 5 minutes, then try again. If it still fails, then and only then should you stop the flow and immediately send a high-priority alert to the human admin with the exact error message.

This makes the automation resilient. 

It can “heal” itself from temporary problems. This is the difference between a brittle toy and an enterprise-grade system.

From Prompt-Follower to System-Builder: The “Invisible 80%”

So, if AI can’t build a working flow, is it useless? 

No. It’s an assistant. 

It can be a great starting point, a way to build that first wireframe faster.

But to make an AI-built workflow actually work, you have to become its teacher. 

You have to provide that “invisible 80%” of human logic. You need to be able to explain to the AI (and to yourself):

  1. What exactly does Module 1 output? (I need to know every key, every data type, every possible variation.)
  2. What exactly does Module 2 expect? (Does it need a date in ISO format? Does it need an ID number, not a name?)
  3. What is the exact logic that connects the two? (Do I need a filter? A function to reformat the date? An iterator to loop through items? Do we have all the rules? Can we use Regex instead of LLM for Step X? Do we need an error handler in case the workflow fails?)

This is the fundamental skill. 

It’s not prompting. 

It’s pattern recognition, logical thinking, and integration of sense.

Building one working flow doesn’t make you an AI Automation expert. 

The real skill is formed when you move from building five to fifty to a hundred. 

The skill comes from debugging, optimizing, and scaling

It comes from seeing a workflow fail and knowing instantly which of the 20 “in-between” places it broke.

AI is My Co-Pilot, Not the Pilot

In my business, AI isn’t replacing the automation expert. It’s making us more valuable. It’s a powerful co-pilot. It can draft ideas, help us build the “wireframe” faster, and even write small pieces of code.

But it is not, and for the foreseeable future will not be, the architect or the engineer. 

It doesn’t understand the system. 

It doesn’t see the “why” behind your connections. 

It can’t predict that your webhook payload might skip a record because of a rate limit. 

And it certainly doesn’t have a “Break” phase to stress-test its own creations.

The future of automation isn’t about writing the perfect prompt. It’s about being the human who understands the whole system. It’s about having a rock-solid process, like the HARDEN™ Method, to ensure that what you build isn’t just a flashy demo.

It’s about building an automation that is robust, resilient, and ready for the messy reality of the real world. That’s where the real skill forms, and that’s the “invisible 80%” that, for now, remains a purely human endeavor.

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