Brain Layer

Definition

The knowledge / memory / orchestration layer that sits underneath agents (or humans) and gives them shared context across the customer lifecycle. Per DEC-015, this layer is the core Harmony product — voice, SDR, marketing connectors all sit on top of it. Per DEC-019, it works for human workers too, not only AI agents.

Related decisions

• DEC-015 — Voice is a feature, not the core. Brain + agent orchestration is the platform.
• DEC-017 — Brain supports both pre-built and bring-your-own agents
• DEC-018 — Brain is API-first (every capability accessible via API)
• DEC-019 — Brain layer works for human workers too

Sources

• vision-2026-04-15 — most explicit articulation
• atera-2026-04-19 — external validation that humans + AI both need this (Rachel’s CSMs use Claude in lieu of a CS CRM)

Related entities

• harmony-core — owns the brain layer
• saar-arbel, vitali — primary architects
• nadav-greenberg — pushed for the human-worker scope

Related concepts

• global-maximum — what the brain enables
• account-timeline — the data structure the brain operates over
• api-first-architecture — distribution model
• bring-your-own-agent — extension model
• cross-funnel-intelligence — the deliverable

Evolution

• Pre-2026-04-15: implicitly understood as part of the platform; not articulated as the core
• 2026-04-15: Nadav’s question “where is voice in the vision document?” forced the explicit statement that brain — not voice — is the product
• 2026-04-19: Atera interview validates that the brain is needed even when agents aren’t; humans benefit too