diff --git a/packages/shared/src/agent-platform-types.ts b/packages/shared/src/agent-platform-types.ts
index dc79f7fc4..cf0220895 100644
--- a/packages/shared/src/agent-platform-types.ts
+++ b/packages/shared/src/agent-platform-types.ts
@@ -67,13 +67,34 @@ export interface AgentApplication {
 
 // --- Revisions -------------------------------------------------------------
 
+/** Normalized reasoning-effort knob; mirrors the backend spec schema. */
+export type ReasoningEffort = "minimal" | "low" | "medium" | "high" | "xhigh";
+
+/** One model in a manual priority list; per-entry reasoning overrides the spec default. */
+export interface ModelEntry {
+  model: string;
+  reasoning?: ReasoningEffort;
+}
+
+/** Quality/cost level for an `auto` policy, resolved to a maintained model list at runtime. */
+export type ModelLevel = "low" | "medium" | "high";
+
+/**
+ * Model selection. `auto` resolves a level to a platform-maintained,
+ * priority-ordered list at runtime; `manual` is the author's explicit
+ * priority list (first entry primary, rest fallbacks).
+ */
+export type ModelPolicy =
+  | { mode: "auto"; level: ModelLevel; reasoning?: ReasoningEffort }
+  | { mode: "manual"; models: ModelEntry[] };
+
 /**
  * The agent spec carried on a revision. Fully typed elaboration (triggers,
  * tools, mcps, skills, limits) lands with the config editor milestone; for now
  * the known top-level fields are surfaced and the rest passes through.
  */
 export interface AgentSpec {
-  model: string;
+  model_policy?: ModelPolicy;
   triggers?: unknown[];
   tools?: unknown[];
   mcps?: unknown[];
@@ -86,7 +107,7 @@ export interface AgentSpec {
     max_wall_seconds?: number;
   };
   entrypoint?: string;
-  reasoning?: "minimal" | "low" | "medium" | "high" | "xhigh";
+  reasoning?: ReasoningEffort;
   [key: string]: unknown;
 }
 
diff --git a/packages/ui/src/features/agent-applications/components/AgentChatPane.tsx b/packages/ui/src/features/agent-applications/components/AgentChatPane.tsx
index 78c75d2d2..77d486e44 100644
--- a/packages/ui/src/features/agent-applications/components/AgentChatPane.tsx
+++ b/packages/ui/src/features/agent-applications/components/AgentChatPane.tsx
@@ -18,6 +18,7 @@ import { useAgentApplication } from "../hooks/useAgentApplication";
 import { useAgentChat } from "../hooks/useAgentChat";
 import { useAgentChatPendingApproval } from "../hooks/useAgentChatPendingApproval";
 import { useAgentRevision } from "../hooks/useAgentRevision";
+import { modelPolicySummary } from "../utils/format";
 import { resolveIngressBaseUrl } from "../utils/ingress";
 import { AgentChatPendingApprovalCard } from "./AgentChatPendingApprovalCard";
 import { AgentChatSurface } from "./AgentChatSurface";
@@ -199,7 +200,7 @@ export function AgentChatPane({
             <PreviewBanner
               revisionId={targetRevisionId}
               isDraft={isDraftPreview}
-              model={revision?.spec?.model}
+              model={modelPolicySummary(revision?.spec?.model_policy)}
               region={cloudRegion}
             />
             <AgentChatSurface
diff --git a/packages/ui/src/features/agent-applications/components/AgentConfigurationPane.tsx b/packages/ui/src/features/agent-applications/components/AgentConfigurationPane.tsx
index e1e43cde8..fd534b323 100644
--- a/packages/ui/src/features/agent-applications/components/AgentConfigurationPane.tsx
+++ b/packages/ui/src/features/agent-applications/components/AgentConfigurationPane.tsx
@@ -618,10 +618,36 @@ function byPath(files: BundleFile[], path: string): BundleFile | undefined {
 // --- bodies -----------------------------------------------------------------
 
 function ModelBody({ spec }: { spec: AgentSpec }) {
+  const policy = spec.model_policy;
   return (
     <Flex direction="column" gap="2">
-      <Row label="model" value={spec.model ?? "not set"} mono />
-      <Row label="reasoning" value={spec.reasoning ?? "default"} />
+      {policy ? (
+        <Row label="policy" value={policy.mode} />
+      ) : (
+        <Row label="model" value="not set" mono />
+      )}
+      {policy?.mode === "auto" ? (
+        <>
+          <Row label="level" value={policy.level} />
+          <Row
+            label="reasoning"
+            value={policy.reasoning ?? spec.reasoning ?? "default"}
+          />
+        </>
+      ) : null}
+      {policy?.mode === "manual" ? (
+        <>
+          {policy.models.map((m, i) => (
+            <Row
+              key={`${m.model}:${m.reasoning ?? "_"}`}
+              label={i === 0 ? "model" : "fallback"}
+              value={m.reasoning ? `${m.model} · ${m.reasoning}` : m.model}
+              mono
+            />
+          ))}
+          <Row label="reasoning" value={spec.reasoning ?? "default"} />
+        </>
+      ) : null}
       {spec.entrypoint ? (
         <Row label="entrypoint" value={spec.entrypoint} mono />
       ) : null}
diff --git a/packages/ui/src/features/agent-applications/utils/format.ts b/packages/ui/src/features/agent-applications/utils/format.ts
index 3eed86c74..06371d7e9 100644
--- a/packages/ui/src/features/agent-applications/utils/format.ts
+++ b/packages/ui/src/features/agent-applications/utils/format.ts
@@ -2,6 +2,7 @@ import type {
   AgentApprovalRequestState,
   AgentRevisionState,
   AgentSessionState,
+  ModelPolicy,
 } from "@posthog/shared/agent-platform-types";
 /** Formats a USD spend value for the fleet / agent stat strips. */
 export function formatSpendUsd(value: number | null | undefined): string {
@@ -111,3 +112,14 @@ export function revisionStateColor(
       return "gray";
   }
 }
+
+/** Short, glanceable model-policy label for banners (e.g. "auto · high", "claude-sonnet-4-6 +1"). */
+export function modelPolicySummary(
+  policy: ModelPolicy | null | undefined,
+): string | undefined {
+  if (!policy) return undefined;
+  if (policy.mode === "auto") return `auto · ${policy.level}`;
+  const [first, ...rest] = policy.models;
+  if (!first) return "manual";
+  return rest.length > 0 ? `${first.model} +${rest.length}` : first.model;
+}