Source of Inspiration: Lance (LangChain) & Pete (Manus)

Original Video: https://www.youtube.com/watch?v=6_BcCthVvb8

We stand on the precipice of a revolution driven by AI Agents. We envision them as reliable assistants, autonomously navigating long and complex tasks. Yet, a profound paradox is quietly unfolding: the more we rely on them, the more susceptible they become to getting lost. When a task stretches across dozens or even hundreds of interactions, these once-brilliant agents can grow sluggish, repetitive, and even forget their original objective. This is the "amnesia" dilemma of AI Agents—an invisible shackle holding back their full potential.

The root of the problem lies in the finite space known as the "context window." It is the agent's working memory, where all information needed for decision-making—instructions, conversation history, tool outputs—must be loaded. As this information accumulates, the context becomes bloated, and a phenomenon called "context rot" sets in, causing the model's performance to plummet. Many believe the solution is to endlessly expand this window, but that's akin to solving a library's retrieval problem by building an infinitely large building. The true answer lies not in brute-force expansion, but in a more subtle wisdom: the art of "Context Engineering." At its core, this discipline is about creating an elegant, efficient, and focused environment for the AI's mind to operate.

The Art of Reduction: Lightening AI's Cognitive Load

To grasp the logic behind this, we must first recognize that not all information holds equal immediate value. The starting point of context engineering is learning to strategically "lighten the load" on an AI's memory. This involves two distinct yet complementary techniques: "Compaction" and "Summarization."

"Compaction" is a precise art of externalization. Imagine a tool, like a web search, returns a massive volume of text. Instead of permanently pinning thousands of words to the agent's memory board, we can save the full output to an external file system, leaving only a concise path or index in the context, such as "Search results saved to result_01.txt." This process is entirely reversible; no information is lost. The AI gains a perfect digital external memory, allowing it to retrieve the original data whenever needed. This method ensures the integrity of the historical record, enabling the agent to trace back to every initial detail, even a hundred steps latehttps://baoyu.io/uploads/2025-10-15/1760497764521.png760497764521.png" data-width="100%" data-align="center">

However, when the context growth surpasses a critical threshold, even compaction is not enough to prevent overload. This is when we must turn to "Summarization." This is more an act of intellectual distillation than mere information transfer. It often involves another AI model stepping in to read a lengthy interaction history and distill it into a highly condensed summary. This process is inherently lossy, just as a profound book review can never replace the original work. Therefore, it must be used judiciously. The most effective approach is to first solidify key information using reversible "compaction" before applying summarization to the remainder. This ensures that while the memory is being lightened, the most precious sparks of insihttps://baoyu.io/uploads/2025-10-15/1760497794864.pngads/2025-10-15/1760497794864.png" data-width="100%" data-align="center">

The Wisdom of Collaboration: Building a "Sohttps://baoyu.iohttps://baoyu.io/uploads/2025-10-15/1760497869685.png>

Once we master the management of a single agent's memory, a grander picture emerges: how can we enable multiple agents to collaborate efficiently, like a well-orchestrated team? This brings us to the second pillar of context engineering: Isolation. A maxim from computer science is particularly fitting here: "Don't communicate by sharing memory; instead, share memory by communicating." This wisdom reveals two fundamental pahttps://baoyu.iohttps://baoyu.io/uploads/2025-10-15/1760497825180.pngial network."

The first pattern is "Communicating." This is like a project manager assigning a clearly defined, self-contained task (e.g., "Find all bugs in this code report") to a specialist. While executing the task, the specialist's context window contains only this specific instruction, free from the noise of the entire project's history. They simply need to complete the job and return the final result. This pattern is clean and efficient, ideal for sub-tasks thhttps://baoyu.iohttps://baoyu.io/uploads/2025-10-15/1760497893931.pngg informational interference.

The second pattern is "Sharing Context." Imagine a strategic consultant being brought into an ongoing project. To provide valuable insights, they must read all the meeting minutes, email threads, and decision documents from the project's inception. In this model, a sub-agent is granted access to the main agent's full historical context but operates with its own unique system prompt and specialized toolset. This allows it to approach the problem from a fresh, expert perspective while being fully informed of the global background. Though more costly, this pattern is invaluable for complex, interdepehttps://baoyu.iohttps://baoyu.io/uploads/2025-10-15/1760497912616.pngual understanding, such as in-depth research.

Thus far, our discussion has centered on managing the information within the context. However, the most revolutionary idea in context engineering lies in applying the same principles to managing the tools themselves. When an agent is presented with dozens or even hundreds of tools, it can fall into "tool confusion," unsure which one to invoke in a given situation. The real solution is not to give it an infinitely large https://baoyu.iohttps://baoyu.io/uploads/2025-10-15/1760497963754.png explorable "action ecosystem." This is the "Layered Action Space" framework.

Layer One is the Core: Function Calling. These are the agent's most fundamental, atomic abilities—its "primal instincts." At this level, we provide only a very small number (e.g., fewer than ten) of absolutely essential and universal functions, such as: read file, write file, execute shell cohttps://baoyu.iohttps://baoyu.io/uploads/2025-10-15/1760497980191.pnghe stable, reliable, and easily understood bedrock of its interaction with the digital world.

Layer Two is the Environment: Sandbox Utilities. Here, the paradigm shifts. The agent is no longer passively "given" tools; it is placed within a virtual sandbox pre-loaded with various utilities. Using the "execute shell command" function from its core layer, it can discover, learn, and use these tools just as a human would on a computer (e.g., using ls to see files, grep to search content, or running a custom mcp-cli program). The agent evolves from a mere "tool user" to an "environhttps://baoyu.iohttps://baoyu.io/uploads/2025-10-15/1760497994050.pngno longer limited by the length of its system prompt but can expand infinitely as it learns its surroundings.

Layer Three is the Ecosystem: Packages & APIs. This is the highest level of abstraction. Here, the agent is empowered to write and execute code, such as Python scripts. This grants it access to a virtually limitless universe of third-party libraries and external APIs, whether for complex data analysis, 3D model generation, or fetching real-time financial market data. At thihttps://baoyu.iohttps://baoyu.io/uploads/2025-10-15/1760498022024.pngn creator," dynamically composing the powers of the external ecosystem to build unprecedentedly complex workflows on the fly.

This three-tiered framework transforms the agent's capabilities from a flat list into a three-dimensional, exhttps://baoyu.io/uploads/2025-10-15/1760498051817.pngs the problem of tool overload but, more importantly, provides a clear and powerful pathway for the agent's growth and emergent intelligence.

Less is More: Returning to the Essence of Symbiosis with AI

Looking back at the strategies of context engineering—from comhttps://baoyu.iohttps://baoyu.io/uploads/2025-10-15/1760498116508.pngn and layering—we arrive at a simple, profound truth: its ultimate goal is not to build an increasingly complex scaffold around the AI, but to make its job simpler.

Every successful act of context management is an exercise in eliminating noise and sharpening focus. Our greatest leaps forward often come from simplifying our architecture, from removing unnecessary tricks, and from placing a little more trust in the model's inherent intelligence. The essence of context engineering is to create a pristine environment where that intelligence can flourish.

In the end, our pursuit is not a "super-program" force-fed with commands and tools, but a "digital partner" endowed with core capabilities and trusted to learn, explore, and create within a rich ecosystem. This, perhaps, is the true path toward a symbiotic future with AI—not by building more, but by understanding more.

---