diff --git a/NucleicRemote/Shared/SessionActivityAttributes.swift b/NucleicRemote/Shared/SessionActivityAttributes.swift
index 467eed3..0d29361 100644
--- a/NucleicRemote/Shared/SessionActivityAttributes.swift
+++ b/NucleicRemote/Shared/SessionActivityAttributes.swift
@@ -2,19 +2,74 @@ import ActivityKit
 import Foundation
 
 /// The one aggregate Live Activity (UX_IOS §5.3, aggregate per §11.4 — a single Activity
-/// respects iOS's budget better than one per session): "N running, M waiting" plus the most
-/// urgent session's title. Shared between the app (which starts/updates it) and the widget
-/// extension (which renders it).
+/// respects iOS's budget better than one per session). It answers "what is Nucleic doing right
+/// now?" at a glance: the headline counts (running / waiting / approvals), the total churn in
+/// flight, and a few of the most urgent sessions with their state and diff. Shared between the
+/// app (which starts/updates it) and the widget extension (which renders it).
+///
+/// Deliberately free of `NucleicProtocol` types — the widget extension links only this file, so
+/// the state carries plain value types and its own small `Backend`/`Kind` enums rather than the
+/// wire `BackendID`/`SessionStatus`.
 struct NucleicSessionAttributes: ActivityAttributes {
+    /// The agent behind a session — drives a row's provider tag/tint.
+    enum Backend: String, Codable, Hashable {
+        case claude, codex, grok, other
+
+        var label: String {
+            switch self {
+            case .claude: "Claude"
+            case .codex: "Codex"
+            case .grok: "Grok"
+            case .other: "Agent"
+            }
+        }
+    }
+
+    /// A session's live state, collapsed to what the glance needs — drives each row's glyph/tint.
+    enum Kind: String, Codable, Hashable {
+        case running        // agent actively working a turn
+        case provisioning   // worktree/setup spinning up
+        case approval       // blocked on a human approval decision (loudest)
+        case needsInput     // turn ended asking the user something
+        case done           // turn finished its work; nothing required
+        case error          // errored / interrupted
+        case idle           // created, not yet working
+    }
+
+    /// One agent session surfaced in the activity's detail rows.
+    struct SessionLine: Codable, Hashable, Identifiable {
+        var id: String
+        /// The session's title (falls back to the project name upstream).
+        var title: String
+        /// Project the session belongs to.
+        var project: String
+        var backend: Backend
+        var kind: Kind
+        /// A compact right-aligned status: its diff ("3 files +42 −7"), "2 to approve",
+        /// "Waiting on you", "Working…", etc.
+        var detail: String
+    }
+
     struct ContentState: Codable, Hashable {
         /// Sessions actively working a turn.
         var runningCount: Int
         /// Sessions blocked on the user (approval or next prompt) — the loud number.
         var needsYouCount: Int
-        /// The most urgent session's title: the top waiting one, else the busiest running.
-        var topTitle: String?
-        /// Whether `topTitle` is waiting on the user (amber) vs just running (blue).
-        var topNeedsYou: Bool
+        /// Total individual approval decisions waiting across all sessions — the "act now" count.
+        var approvalCount: Int
+        /// Aggregate worktree churn across the active sessions.
+        var filesChanged: Int
+        var linesAdded: Int
+        var linesRemoved: Int
+        /// The most urgent sessions, attention-first (capped, typically ≤3): the detail rows.
+        var lines: [SessionLine]
+
+        /// The single most urgent session (drives the compact/minimal regions).
+        var top: SessionLine? { lines.first }
+        /// Whether anything needs the user (waiting session or a pending approval).
+        var needsAttention: Bool { needsYouCount > 0 || approvalCount > 0 }
+        /// Whether any worktree has uncommitted changes to summarize.
+        var hasChurn: Bool { filesChanged > 0 }
     }
 
     /// The paired Mac's name (static for the Activity's lifetime).