The real cost shows up when you order the tooling, the applicable directive when you close the design, and the failure mode in the first production run: always late, and always expensive to correct. Engineering puts that work up front —manufacturability, failure modes, costing and conformity— and carries on once series production starts: control plan, reliability, maintenance, root cause and supplier search.
Includes Core: the project, the plan, the risks, the agent and the four official-source search tools.
Engineering includes Core —the project, the five agents, the Chat and the four official searches—, so every analysis starts from the project context and not from a hand-written description.