The one-line idea

Agent = Model + Harness
The model is the brain.
The harness is everything that makes the brain useful.

A model alone is a powerful brain in a jar. A harness is the skeleton, memory, hands, immune system, and nervous system that turn raw reasoning into work an organization can trust.

L1 ConstraintSkeleton — the boundaries the agent cannot cross.
L2 ContextMemory — what the model sees this turn.
L3 ExecutionHands — tools, sandboxes, permissions.
L4 VerificationImmune system — did it actually work?
L5 LifecycleNervous system — startup, health, crash recovery.
MODEL Brain Layer 5 Lifecycle · nervous system Layer 4 Verification Layer 3 Execution Layer 2 Context Layer 1 Constraint