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Three representations of an agent loop stacked vertically, progressing from a solid circle to a segmented circle to a node-and-edge graph, illustrating the spectrum from implicit to fully explicit control flow
April 14, 2026 • Frank Valcarcel

The Agent Loop: One Pattern, Three Frameworks

Every agent framework runs the same loop: call the LLM, execute tools, repeat until done. Here is what that looks like across three frameworks, and what breaks when you scale it.

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