Developer finds 'minimal' coding agent pi is disciplined, not small

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A developer spent a month building their own coding agent from scratch before comparing it to pi, a widely cited minimal AI coding harness. Upon inspection, pi had grown to over 12,600 lines and eight tools — far beyond its original four-tool reputation. However, closer analysis revealed that pi's core default session still exposes only the original four tools, with extras kept opt-in, and all five previously rejected features remained absent. The apparent complexity reflected depth rather than scope creep, with additions like a compaction subsystem and eval suite each solving a concrete, necessary problem. The developer concluded that true minimalism in software means disciplined refusal of features, not low line counts.

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