The Agent System Design Blueprint — the Complete Production-Agent Architecture on One Sheet, With a Design Checklist for Every Layer

The companion to the video. A demo is a model with a prompt — a product is a model with a SYSTEM around it, and this is the whole system on one printable sheet: the core agent loop (model + tools + a loop with a real exit condition) plus the seven subsystems every production agent needs. THIS BLUEPRINT: the full master schematic on page 2 (print it), then a working checklist for every layer — S1 ORCHESTRATION with the five proven patterns (prompt chaining, routing, parallelization, orchestrator-workers, evaluator-optimizer) and when to reach for each; S2 CONTEXT + MEMORY with the four moves that defend the attention budget against context rot (system-prompt altitude, just-in-time context, compaction, notes-to-memory); S3 TOOLS as an agent-computer interface — fewer sharper tools, new-hire docs, error returns the model can act on, native formats; S4 GUARDRAILS in rings — least-privilege permissions, input/output validation, the irreversibility line with human gates, and the spend/loop/time breakers; S5 INSTRUMENTS — traces, outcome-graded evals, and the drift needles, because an agent without evals is a rumor; S6 POWER — model routing per step, prompt caching, parallel fan-out, and code-enforced budgets; S7 CHASSIS — checkpoints, idempotent retries, degraded modes, and versioning everything. Plus the workflow-vs-agent decision tree and the five ship-it questions. Terminology verified against Anthropic's published agent-engineering research, July 2026. Independent field guide from Hyperautomation Labs.

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