Does structured, scoped personal context measurably improve AI agent performance compared to flat memory, platform memory, or no memory at all? We present preliminary results from a controlled benchmark comparing four context strategies across five real-world scenarios. The structured three-file approach (key.md + log.md + insights.md) outperformed every alternative on accuracy, token efficiency, and hallucination suppression.
No existing benchmark tests context management at the personal/user level. Retrieval benchmarks test document search. Long-context benchmarks test window utilization. Memory benchmarks test fact recall. None test whether structured personal context — the decisions you've made, the people you work with, the state of your projects — improves agent performance in realistic work scenarios.
PCM sits at a novel intersection. This evaluation asks whether the structure matters, or whether more context (regardless of structure) is always better.
Four context strategies, tested against the same five scenarios:
Less context, better structured, beats more context dumped raw.
The ALIVE kernel — three files totaling roughly 200-600 tokens of injected context — outperformed a full context dump of 50,000+ tokens. The structured approach used 32% fewer input tokens while achieving 14% higher accuracy and producing 5x fewer hallucinations.
A 200-token skill file replacing 50,000 tokens of MCP context is the exemplar. Structure matters more than quantity. Scoping matters more than volume. The attention budget is real — every token you inject depletes the model's ability to attend to everything else.
The direction is clear. Structured personal context — scoped by domain, provisioned to the agent, with identity/history/knowledge separation — outperforms every alternative we tested. The gap between structured and unstructured widens as task complexity increases.
The implication for the field: context engineering is not about giving agents more information. It is about giving them the right information, in the right structure, at the right scope.