-**Scope of the server half (clarified 2026-07, framework#3923; api clause amended 2026-10-29, Ruling-ref: 6499781492).** "The server rejects the call" means the PLATFORM ACTION DOOR — `POST /api/v1/actions/<object>/<action>` and the MCP `run_action` bridge, which enforce one gate (`packages/runtime/src/action-execution.ts#actionPermissionError`) and dispatch `type: 'script'`, `type: 'flow'` and the declarative `operation: 'update'` write. A `type: 'api'` action whose `target` is a same-origin platform path — the declared `target`, before interpolation, starts with exactly one `/` and goes on past it (`/` alone, `//host` and `/\host` are not), as the server card's `isSameOriginApiTarget` judges it (PR #27649; once the symbol is on `main`, card #27694 rewrites this citation into a symbol anchor on `isSameOriginApiTarget` in `packages/runtime/src/action-execution.ts`; the door holds the interpolated path to the same test before it forwards) — is dispatched by that door too: the route and the bridge run the anonymous baseline, this D4 gate and the ADR-0126 §8 activation consult, then forward the call in-process to the declared `target` as the caller — the request assembled from the declaration (`method`, `recordIdParam`, `bodyShape`, `bodyExtra`, the placeholders in `target`), the caller's cookies and auth headers carried. The target's `Set-Cookie` is returned on the REST route's response; the MCP bridge relays only the bearer-lane rotation headers (`set-auth-token`, `set-admin-session-token`), and no cookie value enters a tool result. The door gates the calls it dispatches, and only those: the `target` endpoint stays directly reachable — nothing routes a direct call to it through the door — so it MUST still enforce the declared capability itself, and the door's gate is the added check: defence in depth, not a replacement. An api action whose `target` is not a same-origin platform path stays browser-only and ungoverned: the door does not dispatch it, the MCP bridge does not list it, and the activation write door (`POST /api/v1/actions/_activation/<object>/<action>`, `packages/runtime/src/domains/actions.ts#handleActionActivationWrite`) refuses to flip it, with a reason, rather than record a switch nothing consults. The UI half is correspondingly *every* action surface, not just the engine: `record_header`/`record_more` (`page:header`) and `list_item` (the grid row menu) filter their own action lists and were fixed to apply the same gate (objectui), alongside `ActionEngine.getActionsForLocation`. All of them fail OPEN when the client does not know the caller's capabilities — unknown is not denied.
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