@@ -22,7 +22,7 @@ Clause-②: yes (narrowing)
 
 - A list view bound to an object inside the closure (the package's own, a declared dependency's, a platform/system object, an overlay row): same field verdicts, same refusals.
 - A write that names no package (an overlay write) is judged against the whole collection, exactly as before. An object that exists nowhere gets no closure verdict there; #24668 refuses it as `list-view-object-unknown` (see that changeset).
-- The flow door: `flow-trigger-unknown-object` stays an advisory.
+- The flow door: under the same closure, `flow-trigger-unknown-object` refuses an out-of-closure trigger object too (#24669, see that changeset).
 - `os validate`, `os build` and `os lint`: no closure is stated, so the rule skips an unresolvable binding as before.
 - `OS_ALLOW_UNLINTED_METADATA_WRITES=1` still turns a refusal into a logged write.
 - Measured before crossing: the 11 views shipped in this repository carry 39 list-view bindings, in `examples/app-crm`, `app-todo`, `app-showcase` and `app-multi-package`, the `create-objectstack` blank template, and `qa/downstream-contract`. None is outside its package's closure, and the door's `view` rule set refuses none of them, with the package's closure or without it. None of the 97 platform built-in list views retargets `data.object`. Deployed rows were not measured.
 
@@ -0,0 +1,34 @@
+---
+'@objectstack/lint': minor
+---
+
+fix(lint)!: the save door refuses a flow written into a package whose trigger object is outside that package's closure (#24669)
+
+Clause-②: yes (narrowing)
+
+**Why.** The runtime save door judges a write into a package against that package's closure (ruling #9612): the package's own objects, the objects of the packages its manifest declares in `dependencies`, platform/system objects, and provenance-less overlay rows. Every other object is dropped from the snapshot before any rule runs. The dataset door already refused a reference outside that closure (`object-reference-unknown`), and the view door refuses one too (`list-view-object-outside-closure`). The flow door only advised: `flow-trigger-unknown-object` stayed a `warning` there, with the hint "ignore this if another installed package declares it". Under a closure that hedge is false, because the snapshot is the closure: an object outside it is one the package never declared it may reference. So the same mistake was refused at two doors and stored with an advisory at the third.
+
+**What is refused.** A flow written into a package whose record trigger (`config.objectName` on a `record-*` start node) or time-relative sweep (`config.timeRelative.object`) names an object outside the package's closure is refused with one `flow-trigger-unknown-object` issue at `error`, located at that key. The hint names the remedy and the package. An object that exists nowhere is refused the same way, because the closure is all the snapshot sees. A `sys_`-prefixed name is still not judged, exactly as without a closure.
+
+**BREAKING — what moves for consumers.** This is an accept-set narrowing on the metadata save door, shipped as `minor` under the launch-window convention for accept-set narrowings (`.changeset/pre.json` is in `exit` mode, so the next version pass cuts 18.0.0 and this change ships in it).
+
+- FROM: a publish-mode write of a flow into a package, triggered on or sweeping an object outside the package's closure, answered `200` and was stored, with a `flow-trigger-unknown-object` save advisory. This covers `PUT /api/v1/meta/flow/:name?package=…` (and `saveMetaItem` in publish mode), the promotion of a draft (`POST /api/v1/meta/flow/:name/publish`, `publishMetaItem`), a package draft publish (`publishPackageDrafts`), and a package copy (`duplicatePackage`), which writes its copies through the same door.
+- TO: `saveMetaItem` in publish mode, the draft promotion and `publishPackageDrafts` answer `422 INVALID_METADATA`, with the `flow-trigger-unknown-object` issue at `error` at the trigger key, and nothing is stored. A package draft publish fails the item, and the batch with it. In `duplicatePackage`, a copied flow whose trigger object stays outside the copy package's closure is refused with the same rule and listed in its `failed[]`. One way that happens is when that object's own copy was refused.
+- Fix: declare a dependency on the package that defines the trigger object in the `dependencies` of the writing package's manifest, or trigger the flow on an object the package may reach (its own, a declared dependency's, or a platform object). Then save again. Saving the flow as a draft (`mode: 'draft'`) is still allowed, because drafts are never gated; publishing that draft is judged.
+
+**The next save of a stored flow whose trigger object is outside its package's closure is refused with the fix; stored flows keep loading and firing until then.** The door judges writes only. A stored row is not re-judged at boot.
+
+**Unchanged.**
+
+- A flow triggered on an object inside the closure (the package's own, a declared dependency's, a platform/system object, an overlay row): no finding, as before.
+- A write that names no package (an overlay write), a write naming a package the registry cannot produce, and the `sys_metadata` sentinel state no closure: an object the whole collection does not carry is still a `flow-trigger-unknown-object` save advisory, byte-identical to before.
+- `os validate`, `os build` and `os lint`: no closure is stated, so the rule's verdict, severity and wording are unchanged.
+- `OS_ALLOW_UNLINTED_METADATA_WRITES=1` still turns a refusal into a logged write.
+- Measured before the change: every record-triggered or time-relative start node shipped in this repository (21, all in `examples/app-showcase` and `examples/app-todo`; no flow in `packages/apps`, `packages/platform-objects` or the `create-objectstack` template) triggers on an object its own stack defines, and objectui ships no such flow. Deployed rows were not measured.
+
+**API.**
+
+- `validateFlowTriggerReadiness(stack, options?)` accepts an optional `{ packageScope }` (`{ packageId, dependencies }`). Stated, an unknown trigger object is an `error`; omitted, the rule answers as before.
+- The runtime publish gate hands `AuthoringRuleContext.packageScope` to this rule, which now reads it beside `validateListViewFieldRefs`.
+
+<!-- adr-0087: not-required (no-migration-prescription) a refusal at the metadata save door of a flow written into a package whose trigger object is outside that package's dependency closure: no authorable key, spelling, export or stored shape moves, and no stored row is read, rewritten or converted. A stored flow with such a trigger keeps loading and firing until it is next saved, and the repair is the author's choice of which package to declare as a dependency (or which object to trigger on), which no ledger entry can derive. The other categories are closed on facts: the package publishes (not unpublished); no ADR-0087 id covers this door (not already-registered); and the change is a door verdict, not a declaration or an export (not runtime-interface-only, type-surface-only or runtime-export-retired). -->
@@ -710,7 +710,9 @@ the written item's **package closure** — the written package, its declared
 dependencies, and unconditionally both platform/system objects and rows carrying
 no package provenance (#9612); a provenance it cannot read narrows nothing at all.
 That changes what a rule can **resolve**, never which rules run, and nothing at
-this door walks `packages[]`. One rule is told the closure is in force: a list
+this door walks `packages[]`. Two rules are told the closure is in force. A flow
+whose trigger object is outside it is refused with `flow-trigger-unknown-object`
+instead of advised (#24669), and a list
 view bound to an object outside it is refused with
 `list-view-object-outside-closure` instead of having its field references
 skipped (#24563). With no closure in force — a write that names no package —
 
@@ -384,9 +384,10 @@ export interface AuthoringRuleContext {
    * rule tell "outside what this package declared it may reference" from
    * "not in this stack": an object missing from a narrowed snapshot is the
    * first, one missing from a whole one may come from another package. Read
-   * by `validateListViewFieldRefs` only (through the reference-integrity
+   * by two rules: `validateListViewFieldRefs` (through the reference-integrity
    * suite), which refuses a list view bound outside the closure instead of
-   * skipping it.
+   * skipping it, and [#24669] `validateFlowTriggerReadiness`, which refuses a
+   * flow whose trigger object is outside it instead of advising.
    */
   packageScope?: { readonly packageId: string; readonly dependencies: readonly string[] };
 }
@@ -1359,7 +1360,12 @@ export const AUTHORING_RULES: readonly AuthoringRule[] = [
   // the flow fires. `flow-trigger-unknown-object` deliberately stayed `warning`
   // (the object may come from another installed package — a hedge this rule
   // cannot decide), as did `flow-draft-status-ambiguous` (draft flows DO fire;
-  // that one is ambiguity of intent, not a dead flow).
+  // that one is ambiguity of intent, not a dead flow). [#24669] The hedge is
+  // gone where the runtime publish gate states a package closure: the snapshot
+  // then IS that closure, so an unknown trigger object is one the package never
+  // declared it may reference, and the id is an `error` there — the dataset and
+  // view doors' verdict for the same reference. Without a stated closure (the
+  // three CLI commands, a write that names no package) it is still `warning`.
   //
   // Commit ecdfc9411 added a sixth id, `flow-schedule-organization-missing`, at
   // `warning`; #17396 RETIRED it. The criterion above is what retired it: this
@@ -1379,10 +1385,13 @@ export const AUTHORING_RULES: readonly AuthoringRule[] = [
     // stayed `warning` keep being logged as advisories. The gate judges a
     // snapshot whose `flows` holds only the written item and subtracts the
     // baseline's findings, so this refuses the dead flow's own publish — never
-    // another flow's save on account of a stored one.
+    // another flow's save on account of a stored one. [#24669] The gate's
+    // stated package closure is handed on, so an out-of-closure trigger object
+    // refuses the publish too; the CLI never states one.
     surfaces: CLI_AND_RUNTIME,
     runtimeTypes: ['flow'],
-    run: (stack) => validateFlowTriggerReadiness(stack),
+    run: (stack, ctx) =>
+      validateFlowTriggerReadiness(stack, ctx.packageScope ? { packageScope: ctx.packageScope } : {}),
   },
   // #20553 — `flow-api-trigger-secret-missing`, split out of the entry above as
   // its own exported rule. Same family, same `error`, all three commands.
 
@@ -313,8 +313,9 @@ export const REFERENCE_INTEGRITY_RULES: readonly ReferenceIntegrityRule[] = [
   // reference, or nowhere at all — and the member's skip 1 used to read that as
   // "another package's object" and judge nothing. It now refuses the binding
   // instead (`list-view-object-outside-closure`, `error`: the verdict the
-  // dataset door gives an out-of-closure base object under the same closure;
-  // the flow door's trigger-object advisory is a separate question). The
+  // dataset door gives an out-of-closure base object under the same closure,
+  // and [#24669] the one the flow door gives an out-of-closure trigger object,
+  // from its own rule outside this suite). The
   // missing-collection argument above is unchanged: the binding is judged
   // against `stack.objects`, the collection every per-write snapshot carries,
   // and the gate states the scope only when it narrowed that collection.
 
@@ -1755,11 +1755,13 @@ const FLOW_API_TRIGGER_SECRET_MISSING_EXPLANATION: RuleExplanation = {
 };
 
 // `flow-trigger-unknown-object` lives in the same rule file but is not one of
-// the five: its verdict depends on packages a build cannot see, so it warns.
+// the five: its verdict depends on packages a build cannot see, so it warns —
+// except under a package closure the runtime publish gate states, where the
+// snapshot is that closure and the id refuses.
 
 const FLOW_TRIGGER_UNKNOWN_OBJECT_EXPLANATION: RuleExplanation = {
   rule: 'flow-trigger-unknown-object',
-  covers: 'why an unknown trigger object only warns',
+  covers: 'why an unknown trigger object warns, and when it refuses',
   paragraphs: [
     'A record-triggered flow binds an ObjectQL hook filtered to the exact name in its start node\'s ' +
       '`config.objectName`, and a time-relative sweep queries the exact name in `config.timeRelative.object`. ' +
@@ -1769,8 +1771,16 @@ const FLOW_TRIGGER_UNKNOWN_OBJECT_EXPLANATION: RuleExplanation = {
       'another installed package, which a build of this stack cannot see, so the finding is a warning and ' +
       'can be ignored when such a package declares the object; a `sys_` name is a platform object and is ' +
       'not judged. Of the findings that say a flow never fires, it is the only one that stays advisory: ' +
-      'the others are settled by contracts this repository ships. At the runtime publish gate it is a save advisory, ' +
-      'judged against the live object registry, never a refusal.',
+      'the others are settled by contracts this repository ships. At the runtime publish gate a write that ' +
+      'names no package gets it as a save advisory, judged against the live object registry.',
+    'A write into a package is judged against that package\'s closure instead: its own objects, the objects ' +
+      'of the packages its manifest declares in `dependencies`, and platform objects. An object outside it ' +
+      'is one the package never declared it may reference, and nothing it installs puts the object in ' +
+      'reach until its manifest declares the dependency, so there the finding is an error and the publish ' +
+      'is refused, the verdict the dataset and view doors give the same reference. Declare a dependency on ' +
+      'the package that defines the object, or trigger the flow on an object inside the closure. A `sys_` ' +
+      'name is not judged there either, a draft save is not gated, and a stored flow is judged at its next ' +
+      'publish.',
   ],
 };