feat: add agent runtime info tracking with model detection from rollout files

packages/app/src/app/agent/[serverId]/[agentId].tsx

@@ -33,6 +33,7 @@ import {
   HOME_NAVIGATION_KEY,
   startNavigationTiming,
 } from "@/utils/navigation-timing";
+import { extractAgentModel } from "@/utils/extract-agent-model";
 
 const DROPDOWN_WIDTH = 220;
 const EMPTY_STREAM_ITEMS: StreamItem[] = [];
@@ -44,47 +45,6 @@ type GitRepoInfoResponseMessage = Extract<
 
 type BranchStatus = "idle" | "loading" | "ready" | "error";
 
-function extractAgentModel(agent?: Agent | null): string | null {
-  if (!agent) {
-    return null;
-  }
-
-  const directModel = typeof agent.model === "string" ? agent.model.trim() : "";
-  if (directModel.length > 0) {
-    return directModel;
-  }
-
-  const metadata = agent.persistence?.metadata;
-  if (!metadata || typeof metadata !== "object") {
-    return null;
-  }
-
-  const persistedModel = (metadata as Record<string, unknown>).model;
-  if (typeof persistedModel === "string" && persistedModel.trim().length > 0) {
-    return persistedModel.trim();
-  }
-
-  const extra = (metadata as Record<string, unknown>).extra;
-  if (!extra || typeof extra !== "object") {
-    return null;
-  }
-
-  const getModelFrom = (source: unknown) => {
-    if (!source || typeof source !== "object") {
-      return null;
-    }
-    const candidate = (source as Record<string, unknown>).model;
-    return typeof candidate === "string" && candidate.trim().length > 0
-      ? candidate.trim()
-      : null;
-  };
-
-  return (
-    getModelFrom((extra as Record<string, unknown>).codex) ??
-    getModelFrom((extra as Record<string, unknown>).claude)
-  );
-}
-
 export default function AgentScreen() {
   const router = useRouter();
   const { serverId, agentId } = useLocalSearchParams<{ serverId: string; agentId: string }>();

packages/app/src/contexts/session-context.tsx

@@ -130,6 +130,7 @@ function normalizeAgentSnapshot(snapshot: AgentSnapshotPayload, serverId: string
     availableModes: snapshot.availableModes ?? [],
     pendingPermissions: snapshot.pendingPermissions ?? [],
     persistence: snapshot.persistence ?? null,
+    runtimeInfo: snapshot.runtimeInfo,
     lastUsage: snapshot.lastUsage,
     lastError: snapshot.lastError ?? null,
     title: snapshot.title ?? null,

packages/app/src/stores/session-store.ts

@@ -74,6 +74,14 @@ export type ProviderModelState = {
   isLoading: boolean;
 };
 
+export interface AgentRuntimeInfo {
+  provider: AgentProvider;
+  sessionId: string | null;
+  model?: string | null;
+  modeId?: string | null;
+  extra?: Record<string, unknown>;
+}
+
 export interface Agent {
   serverId: string;
   id: string;
@@ -89,6 +97,7 @@ export interface Agent {
   availableModes: AgentMode[];
   pendingPermissions: any[];
   persistence: AgentPersistenceHandle | null;
+  runtimeInfo?: AgentRuntimeInfo;
   lastUsage?: AgentUsage;
   lastError?: string | null;
   title: string | null;

packages/app/src/utils/extract-agent-model.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from "vitest";
+import type { Agent } from "@/stores/session-store";
+import { extractAgentModel } from "./extract-agent-model";
+
+describe("extractAgentModel", () => {
+  it("returns runtime model when present", () => {
+    const agent = {
+      runtimeInfo: { model: "gpt-5.2-codex" },
+    } as Partial<Agent> as Agent;
+
+    expect(extractAgentModel(agent)).toBe("gpt-5.2-codex");
+  });
+
+  it("returns null when runtime model missing even if config model is set", () => {
+    const agent = {
+      model: "gpt-5.1-codex",
+      runtimeInfo: {},
+    } as Partial<Agent> as Agent;
+
+    expect(extractAgentModel(agent)).toBeNull();
+  });
+});

packages/app/src/utils/extract-agent-model.ts

@@ -0,0 +1,9 @@
+import type { Agent } from "@/stores/session-store";
+
+export function extractAgentModel(agent?: Agent | null): string | null {
+  if (!agent) return null;
+  const runtimeModel = agent.runtimeInfo?.model;
+  return typeof runtimeModel === "string" && runtimeModel.trim().length > 0
+    ? runtimeModel.trim()
+    : null;
+}