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PRDs, ADRs, design docs and acceptance criteria are not deliverables that engineers tolerate. With agentic tools, they are the substrate that makes agentic engineering work - the same artefacts feeding the implementation agent, the QA agent, and the design agent, with the spec compiled into code, tests, and UI alike. Part 4 walks a worked example end-to-end: adding a public API and RBAC to a B2B SaaS, with auth as the feature carrying through this post and into Part 5.