Context Engineering: The Secret to Agentic AI That Actually Works

By Antonio CernadasOctober 2, 20254 min read

Imagine your company invests in the most advanced AI model on the market, with impeccable system prompts and the most sophisticated reasoning techniques, yet the responses are still incoherent, irrelevant, or erroneous. The culprit? Poorly managed context. At AyGLOO, after working with about 15 clients, we've seen how 70% of AI implementation effort goes into context engineering. Without well-designed context, your AI is like a car with low-quality fuel: it doesn't go far. Today we tell you what context engineering is, why it's key to unlocking Agentic AI potential and how to start applying it.

What is Context Engineering and why is it not just Prompt Engineering?

Prompt engineering focuses primarily on crafting precise and effective instructions to guide the AI model in a single interaction, such as writing a perfect question or command to get an optimal response. Context engineering, on the other hand, is a broader and more dynamic approach: it's about curating and optimizing the entire set of information that the model processes at each step, including not only initial instructions, but also chat history, data brought from external tools (such as database searches or APIs), relevant examples and more.

Context changes with each interaction, adapting to the flow of conversation or task, ensuring that AI maintains coherence and relevance over time. It's like giving a GPS navigator not just the destination address, but an updated map, alternative routes and real-time updates, instead of a disorganized and obsolete atlas.

Why is it so important? Quality is in the Context

In our experience at AyGLOO, 70% of Agentic AI implementation time is dedicated to context engineering. Why? Because dirty context (with redundant, irrelevant or poorly organized data) generates poor quality responses. Imagine a sales assistant analyzing leads: if you give them a dataset with errors, duplicates or obsolete information, their recommendations will be a disaster. Well-designed context, on the other hand, ensures that AI processes only the essential, improving accuracy and reducing hallucinations.

Furthermore, it's also crucial to know what to "let go" or forget during interactions. The context window of models is limited (like a finite fuel tank), so you can't load everything: if a system accumulates 10 files, a history of 20 interactions and data from a database search, much of that will be unnecessary noise. You have to prioritize and discard the irrelevant to avoid saturation, keeping only what drives the current task. Without this management, the model "forgets" key details or gets distracted, lowering overall quality.

How to Implement it: Less is More

To implement context engineering, design your system focusing on delivering the minimum pieces of relevant information in each interaction, avoiding saturating the model with unnecessary data. Start by evaluating what is essential for the task: for example, in an email classification agent, include only clear instructions, key examples and dynamically filtered data, discarding old histories or obsolete files that don't add value.

Usa técnicas como resumir el historial periódicamente o recuperar datos "just-in-time" vía herramientas, para que el contexto se mantenga fresco y eficiente.

Conclusion: Without good context, AI doesn't perform to its maximum

Context engineering is not a luxury, it's a necessity for even the most advanced models to perform to their maximum. Managing what to include and what to "let go" transforms chaotic processes into efficient flows, from sales to audits. At AyGLOO, we've seen how well-curated context elevates AI quality and autonomy.