<![CDATA[Every enterprise commerce platform running today was built for human consumers sitting in front of browsers, clicking, reading, deciding, and entering payment details one field at a time. Agentic commerce introduces an entirely different kind of consumer to this infrastructure, exposing fundamental mismatches through brittle integrations, suboptimal commercial outcomes, and agent transactions that fail to meet customer expectations. This paper argues that the mismatch cannot be resolved through incremental feature additions. Instead, it results from five architectural assumptions that are appropriate for human-initiated commerce but inadequate for agent-initiated commerce: session state coupling, synchronous rendering dependency, human-latency API design, monolithic promotion evaluation, and identity-first checkout. For each assumption, the paper proposes a composable architectural resolution, which together forms a Composable Commerce Design Philosophy based on four core architectural principles. The paper further introduces a four-level Capability Maturity Model to assess the extent to which commerce platforms are prepared for agent-driven transactions. To support practical adoption, a Strangler Fig-based migration strategy is proposed, enabling retailers to progress toward agent-readiness without undertaking a disruptive platform-wide rewrite. The paper concludes by examining the broader industry implications of adopting this design philosophy, including the potential transformation of commerce architecture and competitive dynamics. Attention is given to the risk that agent-readiness could become concentrated among the largest and best-capitalized retailers, creating technological and economic barriers for smaller enterprises. The proposed framework therefore provides both an architectural perspective and a practical pathway for organizations preparing their commerce platforms for an increasingly agent-driven digital marketplace]]>
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