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# Tool↔Gateway Mapping Contract (D8)
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Status: DRAFT — awaiting ratification (webui-audit S2, contract 5 of 9).
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Authority: PRD D8/D12 (Part I §8) — the webUI sits OVER official tooling:
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every webUI operation goes through the Gateway API backed by the same
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official framework tooling the CLI uses, and a webUI operation with no
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backing tool is scored **blocked on tooling** and the tool is built
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first. Measured input: the webui-audit A5 tooling baseline
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(operation-by-operation inventory of the current Gateway surface and the
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P1 gaps, cross-reviewed; `fleet/lanes/webui-audit/findings/
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A5-tooling-baseline.md` in the estate brain). The T10 ruling adopted the
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targeted-update plan including building the D8 tools in A5's rank order.
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This contract binds three things: the operation→tool mapping itself
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(§2–§3), the command envelope every mapped operation satisfies
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(§4), and the process rule that keeps the mapping closed (§5). Domain
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semantics stay with their owning contracts — hierarchy (contract 1,
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`hierarchy-schema.md`), grants (contract 2, `rbac-grant-model.md`),
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wizard (contract 3, `onboarding-wizard.md`), identity
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(`identity-lifecycle.md`), kanban lifecycle (`native-kanban-sot.md`
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§§5–6), roll-up (contract 8), API artifact format (contract 9).
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## 1. Definitions
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1. **Official tool**: a command implemented in the framework packages and
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exposed through the Gateway API; the CLI remains the primary execution
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method for the same command (D8). The webUI is a Gateway client only.
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2. **Mapped operation**: a webUI operation with a named official path in
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§2 or §3. Anything else the webUI wants to do is unmapped and follows
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§5.
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3. **Legacy non-substitute**: an existing endpoint that resembles a P1
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need but is contractually barred from backing it (§3.2).
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## 2. P0 mapping (current operations, ratified as-is)
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The measured P0 surface is conformant today and stays bound to these
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paths:
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| WebUI operation | Official path |
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| ----------------------------------------------------------------- | ---------------------------------------------------------------------------------------------- |
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| Register / log in / log out / OIDC callback | better-auth mount `/api/auth/*`; `GET /api/sso/providers` |
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| List/show projects (legacy read) | `GET /api/projects`, `GET /api/projects/:id` |
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| List tasks / task detail (legacy read) | `GET /api/tasks`, `GET /api/tasks/:id` |
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| Conversation CRUD/search/messages | `/api/conversations*` |
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| Chat turn / stop / thinking / command execute+approve / streaming | `/chat` socket events `message`, `abort`, `set:thinking`, `command:execute`, `command:approve` |
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| Harness/model selection | `GET /api/harnesses*`, `GET/PUT /api/chat/preferences/selection` |
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| Preferences; provider inspect/test | `/api/memory/preferences`, `GET /api/providers`, `POST /api/providers/test` |
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| Admin users / roles / ban / health | `/api/admin/users*`, `/api/admin/health` |
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P0 rows inherit §4 obligations as their backing controllers are next
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touched; they are not required to be retrofitted in one sweep.
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## 3. P1 mapping (bound to the build-first tools)
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1. Every P1 operation maps to exactly one build-first command family, in
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the T10-ruled rank order:
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| Rank | Command family (owning contract) | P1 webUI operations it backs |
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| ---- | ---------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- |
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| 1 | Hierarchy command family (contract 1 §5; grants attach per contract 2) | Company/estate/platform-project/workspace CRUD, parentage and reparenting, hierarchy reads; the wizard's initial-hierarchy step (contract 3 §3.4) |
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| 2 | Hierarchy RBAC command/evaluator (contract 2) | Grant create/change/revoke at company/estate/platform-project; inherited evaluation down to workspace; authorization-safe hierarchy queries |
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| 3 | Typed kanban command/query surface (SOT §§5–6, A1) | Workspace task lifecycle (create/edit/cancel/archive/move), board rank, typed queries |
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| 4 | Agent enrollment command | Enroll one agent: harness, credential reference/API-key intake (values never echoed), name/persona, assignment scope (contract 3 §3.5) |
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| 5 | Authorized roll-up query (contract 8) | Read-only aggregated task counts/statuses at every hierarchy level over readable workspaces only |
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| 6 | Onboarding orchestration (contract 3) | The re-runnable wizard flow, composing ranks 1, 2, and 4 |
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2. **Legacy non-substitutes.** The following MUST NOT back any P1
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operation, matching the audit findings: legacy `/api/projects` and
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`/api/tasks` CRUD (planning-data records, not hierarchy nodes and not
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the typed kanban boundary); `POST /api/workspaces` (filesystem
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bootstrap, not audited hierarchy parentage); `/api/teams` reads (no
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grants, no inheritance); `POST /api/bootstrap/setup` (one-shot
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epoch transition, identity §3 — not the re-runnable wizard); the MCP
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`brain_*` task mutations (legacy Brain writes, not the typed kanban
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commands). These stay serving their existing P0/host consumers until
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each is retired by the migration its owning contract schedules.
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3. New P1 mapping rows (operations this table does not list) are added by
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amending this contract, not ad hoc (§5).
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## 4. Command envelope (request / result / error / audit)
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Binding on every mapped operation the build-first families expose:
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1. **Typed request and result.** Each command and query has an explicit
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request DTO and result DTO in the shared types package, validated at
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the Gateway boundary; unvalidated pass-through and `any`-typed
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payloads are non-conformant. Mutations on records with an
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expected-version rule in their owning contract carry the expected
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version in the request and fail on mismatch with the conflict error
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class (SOT §6 optimistic concurrency; hierarchy per contract 1).
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2. **Error taxonomy.** Every error result carries a stable
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machine-readable code from a closed per-family enum plus an HTTP
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status mapping, distinguishing at minimum: validation failure,
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authentication failure, authorization refusal, not-found, conflict
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(version/uniqueness), precondition/state refusal (e.g. bootstrap
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epoch, suspended team subjects), and internal fault. Where contract
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2's no-existence-oracle rule applies, authorization refusal and
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not-found are indistinguishable on the wire for unauthorized readers
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— same code, same status, same shape.
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3. **Audit linkage.** A mutating mapped operation emits exactly the
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audit events its owning contract defines (contract 1 §5.2, contract 2
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§4.4, identity §§2–4, SOT audit rules); the envelope contributes the
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correlation: every request accepts/generates a correlation id,
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carried into the audit events and returned in the result, so a UI
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action is traceable end to end. The mapping layer itself adds no
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second audit stream.
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4. **Fail-closed.** A mapped operation that cannot evaluate its
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authorization or reach its owning tool refuses (contract 2 §3.5); the
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envelope never degrades to an unauthorized fallback read or a direct
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data access.
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5. **CLI parity.** Each build-first family is invocable through the
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official CLI against the same Gateway commands with the same
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request/result/error contracts. No webUI-only command exists; a
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Gateway command without CLI exposure is a conformance gap tracked at
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the family's implementing issue.
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## 5. Closure rule (blocked on tooling)
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1. A webUI change that needs an operation with no mapping row is
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**blocked on tooling**: the backing tool is built and mapped first
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(D8). Scoring a gap "blocked on tooling" is mandatory, not
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discretionary; working around it in the UI (direct DB or filesystem
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access, calling a legacy non-substitute, embedding domain logic in
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the web app) is non-conformant.
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2. The mapping is enforced closed by §6.1's inventory witness: the web
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app's network surface must be a subset of the mapped paths.
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## 6. Verification requirements
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Binding on the implementing PRs:
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1. **Network-surface inventory witness:** a CI assertion extracting the
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web app's Gateway calls (route literals and socket event names in
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`apps/web` sources) and failing on any call outside the §2/§3 mapped
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paths. The inventory is closed like contract 1 §6.3's allowlist: a
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new call fails until a mapping row exists in the same PR. Dynamic
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route construction that evades extraction is resolved toward the
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witness (routes are declared extractably), not by exempting the
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caller.
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2. **Non-substitute witness:** the P1 surfaces (hierarchy, RBAC, kanban,
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enrollment, roll-up, wizard UI) make zero calls to the §3.2 legacy
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endpoints — asserted by the same inventory, scoped per surface.
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3. **Envelope witnesses per family:** for each build-first family — a
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request with an invalid DTO is refused with the validation code; a
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version-mismatch mutation returns the conflict code; an unauthorized
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read of an existing node and a read of a nonexistent node return
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indistinguishable results where the no-existence-oracle rule applies;
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a correlation id submitted on a mutation appears in its audit
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event(s) and result.
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4. **CLI-parity witness:** for each family, a CLI smoke invocation of at
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least one command and one query against the Gateway succeeds with the
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same typed result the web client receives.
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5. **Fail-closed witness:** with the owning tool or grant state
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unreachable (fault injection), the mapped operation returns the
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internal-fault or authorization-refusal class and performs no
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fallback read/write (extends contract 2 §7.6 to the mapping layer).
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## Ruling request
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Ratify sections 1–6 as written, with one decision embedded:
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- Decision (§3.2): the legacy endpoints named there are **frozen for new
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consumers** as of ratification — existing P0/host consumers keep
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working, new UI or tool code may not call them, and each is retired by
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the migration its owning contract schedules. Alternative if rejected:
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allow P1 surfaces to reuse legacy endpoints as interim backends —
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rejected by the audit's finding that they cannot satisfy the
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hierarchy/kanban/RBAC contracts, so the interim would ship
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non-conformant semantics.
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