On-device AI agents offer the potential for personalized, low-latency assistance, but their deployment is fundamentally constrained by limited memory capacity. Context in agentic settings worsens this problem due to large static tool schemas and a growing interaction history that continually expands the persistent KV cache. To maintain on-device feasibility, agents must operate near the minimum task-sufficient context, while preserving task performance. We introduce two complementary mechanisms: (1) a learned intra-session memory architecture that distills trajectories into an append-only Context State Object (CSO), preserving current state and relevant details from previous steps that may have future utility, while still supporting KV-cache reuse, and (2) a just-in-time schema-passing mechanism that loads full tool definitions only upon tool selection. We instantiate this framework by adapting 3B-parameter SLMs and profiling them on smartphone hardware. In our evaluations, CSO-based memory outperforms KV-cache compression and trained summarization while retaining performance near or even above full-history execution. Deployed on-device, our framework reduces initial tool context by over $6\times$ and interaction-context growth by 10-25 times, substantially reducing initial

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