Reactive Engine Playbook

Build a Brain, Not a Task List

Build a reactive execution engine in 180 lines of Python. Inspired by neuroscience and the Rete algorithm — fires actions when prerequisites are met, not when a scheduler says so. Complete source code included.

Matt Decker

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Your agents keep failing because they think in sequences. Brains don't work that way.

This playbook shows you how to build a reactive execution engine — inspired by the FlyWire fruit fly connectome and the Rete algorithm — that fires actions when prerequisites are met, not when a scheduler says so. 180 lines of Python that power a vulnerability scanner, a trading system, and a personal automation platform.

23 chapters + 4 appendices covering the science (why neurons fire on state, not schedules), the architecture (forward chaining, confidence gating, crash recovery), three complete worked examples, and extensions (retraction models, pattern buses, evolution engines).

Includes the complete source code. Build it in an afternoon. Run it forever.

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Matt Decker

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