Building an AI Story App: Lessons from Shipping Inky

Total Ventures is a permanent-equity company. We build digital products, we keep them, and we operate them. We do not build to flip; we build to hold. Inky, our AI storytelling application, is a core asset in this portfolio.

When I began building an ai story app, the goal wasn't to create a wrapper around a large language model. The goal was to architect a system where AI serves as the workforce, producing high-quality, consistent narrative experiences at scale. This is a report from the field on the architecture, the decisions, and the lessons learned the hard way while shipping Inky.

The Shift in Software Production

AI has collapsed the cost of building software. In the previous era, a product like Inky would have required a funded team of engineers, product managers, and content specialists. Today, it requires one operator who understands how to design the right system.

At Total Ventures, we use an agentic workforce. I architected the operating layer—the agents that handle research, content generation, and monitoring—and I make the decisions the machine escalates. When you are building an ai story app, you are not just writing code; you are designing a factory. The cost that hasn't collapsed is the cost of judgment and the discipline to operate what you build.

Architecture of an Agentic Storytelling Engine

Inky does not rely on a single prompt to generate a story. That approach is brittle and lacks the depth required for a premium product. Instead, we use agentic engineering to break the process into discrete, manageable tasks.

Beyond the Single Prompt

The core engine of Inky consists of multiple agents working in a coordinated loop. One agent is responsible for world-building—establishing the rules, the setting, and the history. Another agent manages character consistency, ensuring that a character’s motivations and voice remain stable across chapters. A third agent handles the actual prose generation, guided by the constraints set by the first two.

By separating these concerns, we achieve a level of quality that a single-shot prompt cannot match. This is the difference between a toy and a product. If you are building an ai story app, your moat is not the model you use; it is the orchestration layer you build around it.

Managing State and Context

One of the primary challenges in long-form storytelling is context drift. As a story progresses, the amount of information the system needs to remember grows. We solved this by implementing a managed data layer that acts as the story's long-term memory.

Instead of feeding the entire story back into the model—which is expensive and leads to noise—our agents query this data layer for relevant facts, character traits, and past events. This keeps the context window clean and the output sharp. We use a relational database to track state and a vector storage system for semantic retrieval. This architecture allows Inky to maintain narrative coherence over thousands of words.

Lessons Learned the Hard Way

Shipping is the only way to find the real friction points. Here is what we learned while bringing Inky to market.

Latency is the Enemy of Immersion

In a storytelling app, the user wants to stay in the flow. High latency kills that experience. We learned the hard way that complex agentic workflows can be slow if not optimized. We moved from a sequential execution model to a parallel one where possible. For example, while the prose agent is writing the current scene, the research agent is already preparing the context for the next one. Shaving milliseconds off the generation process was a requirement, not an optimization.

Cost Control at the Inference Layer

When you operate a portfolio of AI-native products, margins matter. We initially over-engineered our calls, using the most capable models for every task. We quickly realized that smaller, specialized models are more than sufficient for tasks like summarization or character trait extraction. By routing tasks to the appropriate model based on complexity, we improved our margins without sacrificing the quality of the final product. This is owner-level thinking: profit before revenue.

Built to Keep: The Permanent Equity Approach

Inky is built to keep. This means every architectural decision is made with a ten-year horizon in mind. We use a monorepo to manage our products, allowing us to share the agentic engine across different brands. When we improve the character consistency agent for Inky, every other product in the Total Ventures portfolio benefits.

We do not chase trends. We build cash-flowing properties that run on the operating system we designed. The machine executes the work; I allocate the capital and the attention. This leverage allows one person to run a portfolio that would have previously required dozens of employees.

Shipping Today

The barrier to entry for building an ai story app has never been lower, but the barrier to building a durable business has never been higher. It requires a shift from being a developer to being an operator. It requires moving from side projects to permanent equity.

We are working in public to show what is possible when you combine human judgment with an agentic workforce. The artifacts we ship are the proof of the system.

If you are building your own products and want to see the specific frameworks we use to launch and scale, I am happy to talk.

Always forge ahead.

—Justin Tsugranes