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Supersedes decisions 4, 6 and 7 of 0087, together with 0206. The scope tree is free code, and its depth is a plan entitlement (ADR 0240). This corrects the register’s earlier “deep trees are Pro” line (C-04b).
The depth numbers in decision 5 are superseded by ADR 0240 and ADR 0242 (Starter 2, Pro 4, Business 8, Enterprise unlimited; no Free plan). The body is unchanged.

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Context

IAM decides who may do what in which scope. The owner’s IAM answers (mem L594–595, L618–628, L878, 2026-10-20) define the scope tree, roles, conditions, delegation, and access reviews. The scope-tree tier was first written as Pro and later changed to free code with plan-gated depth (L878, the later line wins).

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Decision

  1. Scope tree (A1). A generic scope tree of platform, product, tenant, then levels declared by a product, on ltree. Grants inherit downward. The tree’s shape is declared in code. The tree is free code everywhere. Its depth is gated by the OS plan entitlement (ADR 0240).
  2. Roles (A2). System roles are shipped by modules. Tenants add custom roles. A grant is a role, a principal, a scope and an optional expiry.
  3. Conditions and deny (A3). Structured conditions and explicit deny, with deny overriding allow, in the first release. No expressions.
  4. Delegation (A4). A principal can delegate only at or below its own scope, and only roles it holds. Separation-of-duties role pairs are supported.
  5. Free and Pro lines (A7, as corrected). Free: role-based access, custom roles, one level below the tenant, conditions and delegation. Paid entitlements: relationship-based access, separation-of-duties rules, unlimited depth, the edge decision point, and the OpenFGA and OPA adapters, which come later (Deferred in 0011, and 0227).
  6. Permission names (A10). Are those of ADR 0132.
  7. Access reviews (A11). Review campaigns run on a schedule.

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Consequences

  • A tenant on the lowest plan still gets a usable hierarchy of one level, and it can grow by plan.
  • A deny always wins, so a broad allow cannot override a specific restriction.

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Enforcement

planned — the IAM test suite checks deny-overrides-allow and the delegation bound; the depth limit is checked against the plan entitlement.

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Supersedes and sources

Supersedes: decisions 4, 6 and 7 of 0087 (with 0206). Sources: owner IAM answers A1–A11 (stackra-decisions-2026-10-19.md L594–595, L618–628, 2026-10-20); the scope-tree answer (L878, 2026-10-20 night). Contradiction C-04b.