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Milestone #254 step 4 (#2290). Eleven capabilities, both surfaces, one service. Design systems are owner-scoped top-level records rather than project-scoped ones, so these do not nest under /api/projects/ the way systems do — routes/rulebooks.py was the closer shape. The one exception is the project pointer, which is genuinely about a project: PUT /api/projects/<id>/design-system, PUT rather than PATCH because clearing it is a first-class outcome and not an omission. `/resolved` and `/tokens` are deliberately separate endpoints. One answers "what does this system CHANGE", the other "what does it end up BEING", and a system that overrides nothing has an empty token list and a full resolved set. Shipping only one would have made the other a client-side computation of exactly the kind the record model exists to remove. ResolvedToken.to_dict carries the SHADOWED contributions, not just the winner. Dropping them at the serialisation boundary would have discarded the one thing step 2 was built to preserve, and it would have been invisible — the payload still looks complete. Three sentinel translations on the MCP side, each tested, because an agent cannot omit an argument and a wrong mapping here is silent: - parent_id: 0 = unchanged, -1 = clear (become a family system), positive = set. Renaming a system must not silently re-root it. - order_index: -1 = unchanged, since 0 is a valid position. - value_by_mode: guarded on `is not None`, not truthiness, so `{}` can strip every mode from a token instead of being unreachable. DesignSystemCycle maps to 400 on REST and to a ValueError carrying the message on MCP — kept apart from 404 throughout. An agent told "not found" retries the same call; one told what the loop is can fix it. Two structural guards beyond the parity list: every endpoint must be reachable on the app (catching a decorator copied without its path, where the second handler silently never runs), and every public coroutine in the tools module must be registered (a tool written but never registered is invisible to an agent, and nothing else would notice).