diff --git a/NucleicRemote/Shared/SessionActivityAttributes.swift b/NucleicRemote/Shared/SessionActivityAttributes.swift
index 0d29361..281d720 100644
--- a/NucleicRemote/Shared/SessionActivityAttributes.swift
+++ b/NucleicRemote/Shared/SessionActivityAttributes.swift
@@ -75,3 +75,53 @@ struct NucleicSessionAttributes: ActivityAttributes {
     /// The paired Mac's name (static for the Activity's lifetime).
     var hostName: String
 }
+
+extension NucleicSessionAttributes.ContentState {
+    /// Where a tap on the whole activity should go (UX_IOS §5.3): a session waiting on the user
+    /// opens straight into that session; otherwise (work running, nothing waiting) the sessions
+    /// list. `lines` is attention-first, so any waiting session is `lines.first` — and always in
+    /// the capped list, since waiting outranks running in the sort.
+    var tapURL: URL? {
+        if let waiting = lines.first(where: { $0.kind == .approval || $0.kind == .needsInput }) {
+            return NucleicDeepLink.session(waiting.id)
+        }
+        return NucleicDeepLink.sessionsList
+    }
+}
+
+/// The `nucleic://` deep links the Live Activity emits and the app consumes. Kept in the shared
+/// file so the widget that *builds* a URL and the app that *parses* one can't drift.
+enum NucleicDeepLink {
+    static let scheme = "nucleic"
+
+    /// Open a specific session's detail: `nucleic://session/<id>`.
+    static func session(_ id: String) -> URL? {
+        var c = URLComponents()
+        c.scheme = scheme
+        c.host = "session"
+        c.path = "/\(id)"
+        return c.url
+    }
+
+    /// Surface the sessions list, no specific session: `nucleic://sessions`.
+    static var sessionsList: URL? { URL(string: "\(scheme)://sessions") }
+
+    /// What an incoming link asks the app to do.
+    enum Route: Equatable {
+        case session(String)
+        case sessionsList
+    }
+
+    static func route(for url: URL) -> Route? {
+        guard url.scheme == scheme else { return nil }
+        switch url.host {
+        case "session":
+            let id = url.path.trimmingCharacters(in: CharacterSet(charactersIn: "/"))
+            return id.isEmpty ? nil : .session(id)
+        case "sessions":
+            return .sessionsList
+        default:
+            return nil
+        }
+    }
+}