diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
index 96010b7..d89eeaa 100644
--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -1,6 +1,8 @@
 # Retrofit annotation commit (opsx-annotate, 2026-05-24)
 770ffed41a22f3a45e00e98a8484ca72330eefc9
 
+# Retrofit reverse-spec annotations (opsx-reverse-spec, 2026-05-24, deep-link-registration)
+c72f99a
 # Retrofit reverse-spec annotations (opsx-reverse-spec, 2026-05-24, app-icon-management UUID)
 01a2862
 # Retrofit reverse-spec annotations (opsx-reverse-spec, 2026-05-24, openbuilt-runtime MCP)
diff --git a/lib/Listener/DeepLinkRegistrationListener.php b/lib/Listener/DeepLinkRegistrationListener.php
index 9d8f384..b5fe4a6 100644
--- a/lib/Listener/DeepLinkRegistrationListener.php
+++ b/lib/Listener/DeepLinkRegistrationListener.php
@@ -15,6 +15,9 @@
  * @version GIT: <git-id>
  *
  * @link https://conduction.nl
+ *
+ * @spec openspec/changes/retrofit-2026-05-24-deep-link-registration/tasks.md#task-1
+ * @spec openspec/changes/retrofit-2026-05-24-deep-link-registration/tasks.md#task-2
  */
 
 declare(strict_types=1);
diff --git a/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/design.md b/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/design.md
new file mode 100644
index 0000000..8f58d64
--- /dev/null
+++ b/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/design.md
@@ -0,0 +1,45 @@
+# Design — Retrofit deep-link-registration
+
+> Retrofit change. Tasks describe retroactive annotation, not new implementation
+> work. The code already exists at HEAD.
+
+## Context
+
+`lib/Listener/DeepLinkRegistrationListener.php` (and its companion
+wiring in `lib/AppInfo/Application.php::register`) implement
+OpenBuilt's hook into OpenRegister's unified-search deep-link surface.
+The 2026-05-24 coverage scan dropped these into Bucket 2b
+(`deep-link-registration`) because no existing openbuilt capability
+spec names this listener or the event it consumes.
+
+## Decisions
+
+- **New capability, not extend.** The closest existing spec is
+  `openbuilt-runtime`, but that's a runtime/serving capability — the
+  listener is a search-integration capability, not a runtime mount.
+  ADR-019 is the closest org-wide concept, but it does not specify
+  per-app listener wiring. So this is a brand-new app-local capability.
+- **Two REQs, not one.** Wiring (REQ-OBDL-001) vs payload
+  (REQ-OBDL-002). Splitting them lets future PRs add more
+  `$event->register(...)` calls under REQ-OBDL-002 without touching
+  REQ-OBDL-001's wiring contract.
+- **Capture the stub honestly.** The current handler body registers a
+  single placeholder entry for `schemaSlug: 'example'` — clearly
+  template-stub leftover (matches the comment "Update the register
+  slug, schema slug, and URL template to match your app's actual
+  schemas"). REQ-OBDL-002 stays minimal ("at least one entry, with
+  `{uuid}` placeholder") and the Note block names the gap as TODO
+  rather than silently spec'ing the placeholder as production
+  behaviour.
+- **No hard OR dependency.** The wiring is "if OR is installed and
+  dispatches the event, OpenBuilt responds". REQ-OBDL-001's scenario
+  pins this as an observable invariant — the app must not crash when
+  OR is absent.
+
+## Out of scope
+
+- Replacing the placeholder `example` schema with real OpenBuilt
+  schemas (`application`, `application-version`, `built-app-route`) —
+  separate PR, will extend REQ-OBDL-002 with additional scenarios.
+- ADR-019 integration-registry surface — orthogonal.
+- Unified-search result rendering / icon — OR concern.
diff --git a/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/proposal.md b/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/proposal.md
new file mode 100644
index 0000000..9e23598
--- /dev/null
+++ b/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/proposal.md
@@ -0,0 +1,33 @@
+# Retrofit — deep-link-registration (new capability)
+
+Describes the observed behaviour of
+`DeepLinkRegistrationListener::handle` as 2 REQs in a brand-new
+capability spec. Code already exists — this change retroactively
+specifies it.
+
+## Affected code units
+
+- lib/AppInfo/Application.php::register (event-listener wiring only)
+- lib/Listener/DeepLinkRegistrationListener.php::handle
+
+## Approach
+
+- New capability (`--cluster`) rather than `--extend`: the existing
+  openbuilt specs (runtime, RBAC, exporter, versioning, etc.) all
+  describe authoring or runtime serving of virtual apps. None covers
+  the listener that hooks OpenRegister's unified-search deep-link
+  registration event. ADR-019 (integration registry) is the closest
+  org-wide concept, but it does not specify per-app event-listener
+  wiring as a capability.
+- Two REQs: one for the event-listener wiring (REQ-OBDL-001) and one
+  for the registration payload that the handler emits (REQ-OBDL-002).
+  Splitting the wiring from the payload lets future schema additions
+  (more `$event->register(...)` calls) extend REQ-OBDL-002 without
+  re-litigating the wiring posture.
+- The current `handle` body registers a single deep link for a
+  placeholder schema slug `example` (template-stub left over from
+  scaffold) — Notes block flags this as observed-but-incomplete TODO,
+  not silently spec'd as production behaviour.
+
+Source: `openspec/coverage-report.md` generated 2026-05-24. See
+[retrofit playbook](../../../../hydra/.github/docs/claude/retrofit.md).
diff --git a/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/specs/deep-link-registration/spec.md b/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/specs/deep-link-registration/spec.md
new file mode 100644
index 0000000..831e7aa
--- /dev/null
+++ b/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/specs/deep-link-registration/spec.md
@@ -0,0 +1,100 @@
+---
+retrofit: true
+---
+
+# deep-link-registration Specification
+
+## Purpose
+
+OpenBuilt opts in to Nextcloud's unified-search deep-link integration
+by listening for OpenRegister's `DeepLinkRegistrationEvent` and
+registering per-schema URL templates. When OR resolves a search hit on
+a registered schema, the unified-search result row links straight to
+the matching OpenBuilt detail view — no double-click through OR.
+
+This capability is event-driven: the contract is "if OR is installed
+and dispatches the event, OpenBuilt provides its deep-link table". If
+OR is absent the event never fires and OpenBuilt silently no-ops, so
+the integration is optional and adds zero hard dependency.
+
+## Requirements
+
+### Requirement: Event listener wired at app registration
+
+The app SHALL register a listener for
+`OCA\OpenRegister\Event\DeepLinkRegistrationEvent` during
+`Application::register` via
+`IRegistrationContext::registerEventListener`. The listener class
+SHALL be `OCA\OpenBuilt\Listener\DeepLinkRegistrationListener` and
+SHALL implement `OCP\EventDispatcher\IEventListener<Event>`. The
+listener SHALL be idempotent at the Nextcloud DI level — re-running
+`register()` SHALL NOT result in duplicate registrations. The wiring
+SHALL NOT introduce a hard dependency on OpenRegister: if OR is not
+installed, no event fires and the listener is never invoked.
+
+**ID:** REQ-OBDL-001
+
+#### Scenario: Listener is registered exactly once
+
+- **WHEN** Nextcloud bootstraps the OpenBuilt app and calls
+  `Application::register`
+- **THEN** `IRegistrationContext::registerEventListener` is invoked
+  with `DeepLinkRegistrationEvent::class` and
+  `DeepLinkRegistrationListener::class`
+
+#### Scenario: OpenRegister absent → no-op
+
+- **WHEN** OpenRegister is not installed and OpenBuilt boots
+- **THEN** the wiring registers without raising
+- **AND** no deep-link entries are emitted because the event never
+  fires
+
+#### Scenario: Handler short-circuits on non-matching events
+
+- **WHEN** the listener is invoked with an event that is not an
+  instance of `DeepLinkRegistrationEvent`
+- **THEN** `handle()` returns immediately without calling
+  `$event->register(...)` and without raising
+
+### Requirement: Per-schema deep-link entries registered against the event
+
+When `handle()` receives a `DeepLinkRegistrationEvent`, it SHALL
+register one or more deep-link entries by calling
+`$event->register(appId, registerSlug, schemaSlug, urlTemplate)`.
+Each entry SHALL declare `appId: 'openbuilt'` as the host Nextcloud
+app id. The `urlTemplate` SHALL be a relative path of shape
+`/apps/openbuilt/#/{schemaPath}/{uuid}` with `{uuid}` as the canonical
+placeholder OR substitutes with the matching object's UUID. The
+registration SHALL be additive — calling `$event->register(...)` once
+per schema; the listener SHALL NOT mutate or remove previously
+registered entries on the event.
+
+**ID:** REQ-OBDL-002
+
+#### Scenario: At least one deep-link entry is registered
+
+- **WHEN** OR dispatches `DeepLinkRegistrationEvent` and the listener
+  handles it
+- **THEN** `$event->register(...)` is called at least once with
+  `appId: 'openbuilt'`
+
+#### Scenario: URL template carries the {uuid} placeholder
+
+- **WHEN** the listener registers a deep-link entry
+- **THEN** the `urlTemplate` string contains the literal placeholder
+  `{uuid}` that OR substitutes per result row
+
+#### Note
+
+The handler currently registers only a single placeholder entry for
+schema slug `example` (left over from the
+`nextcloud-app-template` scaffold — see `lib/Resources/template/lib/
+Listener/DeepLinkRegistrationListener.php`). This is observed-but-
+incomplete: the real OpenBuilt schemas (`application`,
+`application-version`, `built-app-route`, etc.) have no deep-link
+entries yet, so unified-search hits on those rows still land on OR's
+generic detail page. TODO (filed separately): replace the placeholder
+with one `$event->register(...)` call per OpenBuilt-owned schema. This
+retrofit spec captures the wiring contract; the catalogue is
+intentionally left to a follow-up so future PRs can extend
+REQ-OBDL-002 without re-litigating REQ-OBDL-001.
diff --git a/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/tasks.md b/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/tasks.md
new file mode 100644
index 0000000..2ce0008
--- /dev/null
+++ b/openspec/changes/archive/retrofit-2026-05-24-deep-link-registration/tasks.md
@@ -0,0 +1,4 @@
+# Tasks
+
+- [x] task-1: deep-link-registration#REQ-OBDL-001 — Event listener wired at app registration (retroactive annotation)
+- [x] task-2: deep-link-registration#REQ-OBDL-002 — Per-schema deep-link entries registered against the event (retroactive annotation)
diff --git a/openspec/specs/deep-link-registration/spec.md b/openspec/specs/deep-link-registration/spec.md
new file mode 100644
index 0000000..831e7aa
--- /dev/null
+++ b/openspec/specs/deep-link-registration/spec.md
@@ -0,0 +1,100 @@
+---
+retrofit: true
+---
+
+# deep-link-registration Specification
+
+## Purpose
+
+OpenBuilt opts in to Nextcloud's unified-search deep-link integration
+by listening for OpenRegister's `DeepLinkRegistrationEvent` and
+registering per-schema URL templates. When OR resolves a search hit on
+a registered schema, the unified-search result row links straight to
+the matching OpenBuilt detail view — no double-click through OR.
+
+This capability is event-driven: the contract is "if OR is installed
+and dispatches the event, OpenBuilt provides its deep-link table". If
+OR is absent the event never fires and OpenBuilt silently no-ops, so
+the integration is optional and adds zero hard dependency.
+
+## Requirements
+
+### Requirement: Event listener wired at app registration
+
+The app SHALL register a listener for
+`OCA\OpenRegister\Event\DeepLinkRegistrationEvent` during
+`Application::register` via
+`IRegistrationContext::registerEventListener`. The listener class
+SHALL be `OCA\OpenBuilt\Listener\DeepLinkRegistrationListener` and
+SHALL implement `OCP\EventDispatcher\IEventListener<Event>`. The
+listener SHALL be idempotent at the Nextcloud DI level — re-running
+`register()` SHALL NOT result in duplicate registrations. The wiring
+SHALL NOT introduce a hard dependency on OpenRegister: if OR is not
+installed, no event fires and the listener is never invoked.
+
+**ID:** REQ-OBDL-001
+
+#### Scenario: Listener is registered exactly once
+
+- **WHEN** Nextcloud bootstraps the OpenBuilt app and calls
+  `Application::register`
+- **THEN** `IRegistrationContext::registerEventListener` is invoked
+  with `DeepLinkRegistrationEvent::class` and
+  `DeepLinkRegistrationListener::class`
+
+#### Scenario: OpenRegister absent → no-op
+
+- **WHEN** OpenRegister is not installed and OpenBuilt boots
+- **THEN** the wiring registers without raising
+- **AND** no deep-link entries are emitted because the event never
+  fires
+
+#### Scenario: Handler short-circuits on non-matching events
+
+- **WHEN** the listener is invoked with an event that is not an
+  instance of `DeepLinkRegistrationEvent`
+- **THEN** `handle()` returns immediately without calling
+  `$event->register(...)` and without raising
+
+### Requirement: Per-schema deep-link entries registered against the event
+
+When `handle()` receives a `DeepLinkRegistrationEvent`, it SHALL
+register one or more deep-link entries by calling
+`$event->register(appId, registerSlug, schemaSlug, urlTemplate)`.
+Each entry SHALL declare `appId: 'openbuilt'` as the host Nextcloud
+app id. The `urlTemplate` SHALL be a relative path of shape
+`/apps/openbuilt/#/{schemaPath}/{uuid}` with `{uuid}` as the canonical
+placeholder OR substitutes with the matching object's UUID. The
+registration SHALL be additive — calling `$event->register(...)` once
+per schema; the listener SHALL NOT mutate or remove previously
+registered entries on the event.
+
+**ID:** REQ-OBDL-002
+
+#### Scenario: At least one deep-link entry is registered
+
+- **WHEN** OR dispatches `DeepLinkRegistrationEvent` and the listener
+  handles it
+- **THEN** `$event->register(...)` is called at least once with
+  `appId: 'openbuilt'`
+
+#### Scenario: URL template carries the {uuid} placeholder
+
+- **WHEN** the listener registers a deep-link entry
+- **THEN** the `urlTemplate` string contains the literal placeholder
+  `{uuid}` that OR substitutes per result row
+
+#### Note
+
+The handler currently registers only a single placeholder entry for
+schema slug `example` (left over from the
+`nextcloud-app-template` scaffold — see `lib/Resources/template/lib/
+Listener/DeepLinkRegistrationListener.php`). This is observed-but-
+incomplete: the real OpenBuilt schemas (`application`,
+`application-version`, `built-app-route`, etc.) have no deep-link
+entries yet, so unified-search hits on those rows still land on OR's
+generic detail page. TODO (filed separately): replace the placeholder
+with one `$event->register(...)` call per OpenBuilt-owned schema. This
+retrofit spec captures the wiring contract; the catalogue is
+intentionally left to a follow-up so future PRs can extend
+REQ-OBDL-002 without re-litigating REQ-OBDL-001.