This site complements the book Loop Engineering: The Brain + Body Architecture for AI Partnership. The book carries the durable architectural claims; this site carries the unstable evidence: vendor capability matrices, the live MCP server catalog, worked examples deeper than print, and errata that accumulate after the book is bound.
Per the book's discipline, vendor specifics and current-state details live here so the print volume stays evergreen.
Start Here — Reading the Book
If you are reading chapter by chapter, the per-chapter resource pages collect cited works, primary-source links, and worked-example assets that extend the print treatment.
Open Chapter Resources →Start Here — Practitioner Track
If you want to apply the architecture, the prompts library and worked examples expand the seven primitives into operational shape per layer.
Open Prompts Library →Report a Correction
Spotted an issue in the book or companion pages? Submit corrections by email; accepted updates are logged in errata.
Open Errata Process →Seven Primitives
The full mapping of the seven primitives across the four traditions (coding-agent practitioners, knowledge-work pedagogy, reasoning-model training, autonomous-agency builders). One sub-page per primitive with concrete examples from each tradition.
Open the Mapping →Vendor Capability Matrices
Current capability deltas across reasoning models (visible vs hidden chain, thinking budget, faithfulness caveats) and agent surfaces (confirmation gates, monitor models, sandboxing). Each matrix carries a verified date so freshness is visible.
Open the Matrices →MCP Server Catalog
The MCP server catalog the book defers from print (Ch 9). Vendor adopters, community projects, capability notes, and links to upstream documentation. Refreshed quarterly so freshness is visible.
Open the Catalog →Worked Examples
Deeper-than-print working examples for each region of the architecture. Full dialog transcripts, multi-step agent traces, complete diagnostic walks.
Open the Examples →Materiality Dial
Extended calibration patterns for the materiality dial (Ch 12) across software, healthcare, legal, policy, and education contexts. Reads alongside the in-book 3×3 matrix.
Open the Patterns →Fleet, Memory, Culture
The Alex ACT Edition fleet bus and Mall catalog snapshots referenced in Ch 14 — the open-source reference implementation of the fleet layer.
Open the Reference →Responsible AI
The Ch 15 cross-disciplinary touchpoints expanded into actual reading paths and an operator obligations checklist that maps directly to the architectural layers.
Open the Reading →