This agentic SDLC starts at design rather than at code: agents write the spec, set up the design system, build, test, ship and watch what is live. A person decides what to make, whether it is good and whether it goes out. Gates on every commit and pull request enforce quality, and a build that fails accessibility or performance does not get to argue.
Most of the time the codebase is a client's, so each skill owns a purpose rather than a tool and reads which tool fills it from the project's stack manifest. The client keeps their framework, CMS, tracker, CI and the way their team already works. We encode the best practice, and what makes a good agentic skill sets out what goes into each one.