diff --git a/apps/mobile/src/components/ProviderIcon.tsx b/apps/mobile/src/components/ProviderIcon.tsx
index 1fe46085d9e8..cd4574b6f84e 100644
--- a/apps/mobile/src/components/ProviderIcon.tsx
+++ b/apps/mobile/src/components/ProviderIcon.tsx
@@ -10,6 +10,7 @@ import { useId, useState } from "react";
 import { resolveOfficialAcpRegistryIconUrl } from "@t3tools/contracts";
 import { useAppearancePreferences } from "../features/settings/appearance/AppearancePreferencesProvider";
 import { AppText as Text } from "./ui/AppText";
+import { cn } from "../lib/cn";
 import { getProviderClient } from "@t3tools/client-runtime/provider-clients";
 
 type ProviderIconProps = {
@@ -158,7 +159,7 @@ export function ProviderInstanceIcon(props: {
   readonly displayName: string;
   readonly accentColor?: string;
   readonly showBadge?: boolean;
-  readonly surfaceColor: string;
+  readonly surfaceColor?: string;
 }) {
   const accentColor = normalizeProviderAccentColor(props.accentColor);
   return (
@@ -173,14 +174,14 @@ export function ProviderInstanceIcon(props: {
           style={{ position: "absolute", right: -3, bottom: -3, width: 32, alignItems: "flex-end" }}
         >
           <View
-            className={accentColor ? undefined : "bg-card"}
+            className={cn(!accentColor && "bg-card", !props.surfaceColor && "border-screen")}
             style={{
               height: 12,
               minWidth: 12,
               paddingHorizontal: 2,
               borderRadius: 999,
               borderWidth: 1,
-              borderColor: props.surfaceColor,
+              ...(props.surfaceColor ? { borderColor: props.surfaceColor } : {}),
               backgroundColor: accentColor,
               alignItems: "center",
               justifyContent: "center",
diff --git a/apps/mobile/src/features/threads/thread-subagent-group.tsx b/apps/mobile/src/features/threads/thread-subagent-group.tsx
index cabd4eeb371b..4a42a83c9a37 100644
--- a/apps/mobile/src/features/threads/thread-subagent-group.tsx
+++ b/apps/mobile/src/features/threads/thread-subagent-group.tsx
@@ -1,19 +1,23 @@
 import { useAtomValue } from "@effect/atom-react";
 import { StackActions, useNavigation } from "@react-navigation/native";
 import { scopeThreadRef } from "@t3tools/client-runtime/environment";
+import {
+  resolveProviderInstanceDisplayName,
+  shouldShowInstanceBadge,
+} from "@t3tools/client-runtime/state/provider-instance-display";
 import { summarizeSubagentStatuses } from "@t3tools/client-runtime/state/subagent-display";
 import { isActiveSubagentStatus } from "@t3tools/client-runtime/state/subagentRuntime";
 import type {
   EnvironmentId,
   OrchestrationV2Subagent,
   OrchestrationV2TurnItem,
-  ServerProvider,
+  ServerConfig,
 } from "@t3tools/contracts";
 import { Pressable, View, type ColorValue } from "react-native";
 
 import { AppText as Text } from "../../components/ui/AppText";
 import { SymbolView } from "../../components/ui/AppSymbol";
-import { ProviderIcon } from "../../components/ProviderIcon";
+import { ProviderIcon, ProviderInstanceIcon } from "../../components/ProviderIcon";
 import { cn } from "../../lib/cn";
 import type { ThreadFeedActivity } from "../../lib/threadActivity";
 import { serverEnvironment } from "../../state/server";
@@ -42,21 +46,53 @@ function SubagentElapsed({ agents }: { readonly agents: ReadonlyArray<AgentTimin
 
 function SubagentAvatar(props: {
   readonly item: SubagentItem;
-  readonly provider: ServerProvider | undefined;
+  readonly config: ServerConfig | null | undefined;
 }) {
+  const providers = props.config?.providers ?? [];
+  const provider = providers.find(
+    (candidate) => candidate.instanceId === props.item.providerInstanceId,
+  );
   // A remote task's own driver is only a "remote" label.
   const driver =
-    props.provider?.driver ??
-    (props.item.remoteChild === undefined ? props.item.driver : undefined);
+    provider?.driver ?? (props.item.remoteChild === undefined ? props.item.driver : undefined);
+  const badgeEntries = providers.map((candidate) => {
+    const rawConfig = props.config?.settings.providerInstances[candidate.instanceId]?.config;
+    const instanceConfig =
+      rawConfig !== null && typeof rawConfig === "object"
+        ? (rawConfig as Readonly<Record<string, unknown>>)
+        : null;
+    const agentId = instanceConfig?.source === "local" ? undefined : instanceConfig?.agentId;
+    return {
+      ...candidate,
+      driverKind: candidate.driver,
+      acpRegistryAgentId: typeof agentId === "string" ? agentId.trim() || undefined : undefined,
+    };
+  });
+  const badgeEntry = badgeEntries.find(
+    (candidate) => candidate.instanceId === props.item.providerInstanceId,
+  );
+  const showBadge =
+    provider !== undefined &&
+    badgeEntry !== undefined &&
+    shouldShowInstanceBadge(badgeEntry, badgeEntries);
   return (
     <View
       accessible={false}
       className="h-7 w-7 shrink-0 items-center justify-center rounded-full border border-border bg-card"
     >
-      {driver === undefined ? (
+      {showBadge ? (
+        <ProviderInstanceIcon
+          provider={provider.driver}
+          iconUrl={provider.iconUrl}
+          size={15}
+          displayName={resolveProviderInstanceDisplayName(provider)}
+          accentColor={provider.accentColor}
+          showBadge
+        />
+      ) : driver === undefined ? (
         <SymbolView name="sparkles" size={13} tintColorClassName="accent-icon-muted" />
       ) : (
-        <ProviderIcon provider={driver} iconUrl={props.provider?.iconUrl} size={15} />
+        <ProviderIcon provider={driver} iconUrl={provider?.iconUrl} size={15} />
       )}
     </View>
   );
@@ -100,11 +136,8 @@ export function ThreadSubagentGroup(props: {
   const expanded = props.expandedRows[props.anchorKey] ?? false;
   const serverConfigs = useServerConfigs();
   // A task in a linked environment runs a provider instance of that environment.
-  const providerOf = (item: SubagentItem) =>
-    (item.remoteChild === undefined
-      ? config
-      : serverConfigs.get(item.remoteChild.environmentId)
-    )?.providers.find((provider) => provider.instanceId === item.providerInstanceId);
+  const configOf = (item: SubagentItem) =>
+    item.remoteChild === undefined ? config : serverConfigs.get(item.remoteChild.environmentId);
   return (
     <WorkLogBlock>
       {grouped ? (
@@ -118,7 +151,7 @@ export function ThreadSubagentGroup(props: {
           <View className="flex-row items-center">
             {agents.slice(0, 3).map((agent, index) => (
               <View key={agent.item.id} style={{ marginLeft: index === 0 ? 0 : -7 }}>
-                <SubagentAvatar item={agent.item} provider={providerOf(agent.item)} />
+                <SubagentAvatar item={agent.item} config={configOf(agent.item)} />
               </View>
             ))}
             {agents.length > 3 ? (
diff --git a/apps/web/src/components/chat/V2LifecycleRow.tsx b/apps/web/src/components/chat/V2LifecycleRow.tsx
index 42ab22fa5f3d..688736a3a876 100644
--- a/apps/web/src/components/chat/V2LifecycleRow.tsx
+++ b/apps/web/src/components/chat/V2LifecycleRow.tsx
@@ -47,6 +47,7 @@ import {
 import { Tooltip, TooltipTrigger, TooltipPopup } from "../ui/tooltip";
 import {
   applyProviderInstanceSettings,
+  brandProviderInstanceEntries,
   deriveProviderInstanceEntries,
   shouldShowInstanceBadge,
   type ProviderInstanceEntry,
@@ -206,12 +207,16 @@ function SubagentAvatar({
   driver,
   displayName,
   iconUrl,
+  accentColor,
+  showBadge,
   status,
   className,
 }: {
   driver?: ProviderDriverKind | undefined;
   displayName?: string | undefined;
   iconUrl?: string | undefined;
+  accentColor?: string | undefined;
+  showBadge: boolean;
   status?: OrchestrationV2TurnItem["status"] | undefined;
   className?: string;
 }) {
@@ -227,7 +232,10 @@ function SubagentAvatar({
         <ProviderInstanceIcon
           driverKind={driver}
           displayName={displayName ?? driver}
+          accentColor={accentColor}
           acpRegistryIconUrl={iconUrl}
+          showBadge={showBadge}
+          size="compact"
           className="z-auto"
           iconClassName="size-3.5"
         />
@@ -237,7 +245,8 @@ function SubagentAvatar({
       {status ? (
         <span
           className={cn(
-            "absolute -right-px -bottom-px size-2 rounded-full ring-2 ring-background",
+            "absolute size-2 rounded-full ring-2 ring-background",
+            showBadge ? "-left-px -top-px" : "-right-px -bottom-px",
             subagentStatusVisual(status).dotClass,
           )}
         />
@@ -261,9 +270,13 @@ export function EnvironmentSubagentAvatar({
   remote?: OrchestrationV2RemoteTaskChild | undefined;
   status?: OrchestrationV2TurnItem["status"] | undefined;
 }) {
-  const providersAtom = serverEnvironment.providersValueAtom(
-    remote?.environmentId ?? environmentId,
-  );
+  const providerEnvironmentId = remote?.environmentId ?? environmentId;
+  const providersAtom = serverEnvironment.providersValueAtom(providerEnvironmentId);
+  const settings = useAtomValue(serverEnvironment.settingsValueAtom(providerEnvironmentId));
+  const entries = (providers: ReadonlyArray<ServerProvider> | null | undefined) => {
+    const derived = deriveProviderInstanceEntries(providers ?? []);
+    return settings ? brandProviderInstanceEntries(derived, settings) : derived;
+  };
   const providerDriver = useAtomValue(
     providersAtom,
     (providers) =>
@@ -272,8 +285,18 @@ export function EnvironmentSubagentAvatar({
   const displayName = useAtomValue(
     providersAtom,
     (providers) =>
-      providers?.find((provider) => provider.instanceId === providerInstanceId)?.displayName,
+      entries(providers).find((entry) => entry.instanceId === providerInstanceId)?.displayName,
+  );
+  const accentColor = useAtomValue(
+    providersAtom,
+    (providers) =>
+      entries(providers).find((entry) => entry.instanceId === providerInstanceId)?.accentColor,
   );
+  const showBadge = useAtomValue(providersAtom, (providers) => {
+    const all = entries(providers);
+    const entry = all.find((candidate) => candidate.instanceId === providerInstanceId);
+    return entry !== undefined && shouldShowInstanceBadge(entry, all);
+  });
   const iconUrl = useAtomValue(
     providersAtom,
     (providers) =>
@@ -285,6 +308,8 @@ export function EnvironmentSubagentAvatar({
       driver={providerDriver ?? (remote === undefined ? driver : undefined)}
       displayName={displayName}
       iconUrl={iconUrl}
+      accentColor={accentColor}
+      showBadge={showBadge}
     />
   );
 }
diff --git a/apps/web/src/providerInstances.test.ts b/apps/web/src/providerInstances.test.ts
index a07ff9ae9b17..891f3312ae83 100644
--- a/apps/web/src/providerInstances.test.ts
+++ b/apps/web/src/providerInstances.test.ts
@@ -8,6 +8,7 @@ import {
 import { describe, expect, it } from "vite-plus/test";
 import {
   applyProviderInstanceSettings,
+  brandProviderInstanceEntries,
   deriveProviderEntriesByEnvironment,
   deriveProviderInstanceEntries,
   getDefaultProviderInstanceModel,
@@ -254,6 +255,32 @@ describe("deriveProviderEntriesByEnvironment", () => {
   });
 });
 
+describe("brandProviderInstanceEntries", () => {
+  it("keeps an instance a project turns on as a sibling for the instance badge", () => {
+    const codex = ProviderDriverKind.make("codex");
+    const settings = {
+      providerInstances: {
+        [ProviderInstanceId.make("codex_work")]: { driver: codex, enabled: false },
+      },
+      projectSettingsOverrides: {
+        [ProjectId.make("project-work")]: {
+          providerInstances: { [ProviderInstanceId.make("codex_work")]: { enabled: true } },
+        },
+      },
+    };
+    const entries = brandProviderInstanceEntries(
+      deriveProviderInstanceEntries([
+        provider({ provider: codex, instanceId: "codex" }),
+        provider({ provider: codex, instanceId: "codex_work" }),
+      ]),
+      settings,
+    );
+    const personal = entries.find((entry) => entry.instanceId === "codex");
+
+    expect(personal && shouldShowInstanceBadge(personal, entries)).toBe(true);
+  });
+});
+
 describe("resolveSelectableProviderInstance", () => {
   it("falls back to the first enabled and available instance", () => {
     const disabled = ProviderInstanceId.make("codex");
diff --git a/apps/web/src/providerInstances.ts b/apps/web/src/providerInstances.ts
index f9e711c40e7f..c2120f60e31c 100644
--- a/apps/web/src/providerInstances.ts
+++ b/apps/web/src/providerInstances.ts
@@ -93,10 +93,7 @@ export function deriveProviderEntriesByEnvironment(
   const byEnvironment = new Map<string, ReadonlyMap<string, ProviderInstanceEntry>>();
   for (const [environmentId, providers, settings] of providersByEnvironment) {
     const derived = deriveProviderInstanceEntries(providers);
-    // The snapshot includes instances enabled by any project; machine settings alone do not.
-    const entries = settings
-      ? derived.map((entry) => applyProviderInstanceBranding(entry, settings))
-      : derived;
+    const entries = settings ? brandProviderInstanceEntries(derived, settings) : derived;
     byEnvironment.set(
       environmentId,
       new Map(entries.map((entry) => [entry.instanceId as string, entry] as const)),
@@ -105,6 +102,14 @@ export function deriveProviderEntriesByEnvironment(
   return byEnvironment;
 }
 
+// The snapshot includes instances enabled by any project; machine settings alone do not.
+export function brandProviderInstanceEntries(
+  entries: ReadonlyArray<ProviderInstanceEntry>,
+  settings: Pick<ServerSettings, "providerInstances">,
+): ReadonlyArray<ProviderInstanceEntry> {
+  return entries.map((entry) => applyProviderInstanceBranding(entry, settings));
+}
+
 /** projectId applies project overrides; explicit null uses machine settings. */
 export function applyProviderInstanceSettings(
   entries: ReadonlyArray<ProviderInstanceEntry>,
diff --git a/packages/client-runtime/src/state/providerInstanceDisplay.test.ts b/packages/client-runtime/src/state/providerInstanceDisplay.test.ts
index 27129f11128b..4ac36acedf76 100644
--- a/packages/client-runtime/src/state/providerInstanceDisplay.test.ts
+++ b/packages/client-runtime/src/state/providerInstanceDisplay.test.ts
@@ -62,6 +62,11 @@ describe("shouldShowInstanceBadge", () => {
     expect(shouldShowInstanceBadge(entry, [entry])).toBe(true);
   });
 
+  it("ignores a non-hex accent color", () => {
+    const entry = { driverKind: codex, accentColor: "blue", enabled: true };
+    expect(shouldShowInstanceBadge(entry, [entry])).toBe(false);
+  });
+
   it("shows the badge when two entries share a driver, even without an accent", () => {
     const first = { driverKind: codex, accentColor: undefined, enabled: true };
     const second = { driverKind: codex, accentColor: undefined, enabled: true };
diff --git a/packages/client-runtime/src/state/providerInstanceDisplay.ts b/packages/client-runtime/src/state/providerInstanceDisplay.ts
index 62f65445e821..ad69b7275342 100644
--- a/packages/client-runtime/src/state/providerInstanceDisplay.ts
+++ b/packages/client-runtime/src/state/providerInstanceDisplay.ts
@@ -74,7 +74,7 @@ export function shouldShowInstanceBadge(
     readonly enabled: boolean;
   }>,
 ): boolean {
-  if (entry.accentColor) return true;
+  if (normalizeProviderAccentColor(entry.accentColor)) return true;
   let sharedProviderCount = 0;
   for (const candidate of entries) {
     if (candidate.driverKind !== entry.driverKind) continue;