Context Is Infrastructure, Not Prompt Stuffing
Why retrieval engines must evolve to be task-aware.
Type
Architecture Note
Author
Brandon Butera
Publication
Published
Evidence
Architectural
Published
November 17, 2025
Systems
ace
The race for larger context windows has distracted from the fundamental problem of information density. A 2MB context window is useless if it is filled with 1.9MB of noise.
### Task-Aware Retrieval
We propose that retrieval systems should be deeply integrated with the agent's current plan. By analyzing the execution log *before* performing retrieval, we can filter sources that are irrelevant to the current subgoal.
### ACE Principles
The ACE (Context Engine) project implements three core filters:
1. **Structural Filter**: Does the source match the project schema?
2. **Temporal Filter**: Is this data recent enough for the decision?
3. **Functional Filter**: Does this source provide an interface the agent can actually use?