fix(ui): inherit default model fallbacks in agents overview (#25729)

Land PR #25729 from @Suko.
Use shared fallback-resolution helper and add regression coverage for default, override, and explicit-empty cases.

Co-authored-by: suko <miha.sukic@gmail.com>

CHANGELOG.md

@@ -33,6 +33,7 @@ Docs: https://docs.openclaw.ai
 - Models/Bedrock auth: normalize additional Bedrock provider aliases (`bedrock`, `aws-bedrock`, `aws_bedrock`, `amazon bedrock`) to canonical `amazon-bedrock`, ensuring auth-mode resolution consistently selects AWS SDK fallback. (#25756) Thanks @fwhite13.
 - Providers/SiliconFlow: normalize `thinking="off"` to `thinking: null` for `Pro/*` model payloads to avoid provider-side 400 loops and misleading compaction retries. (#25435) Thanks @Zjianru.
 - Gateway/Models: honor explicit `agents.defaults.models` allowlist refs even when bundled model catalog data is stale, synthesize missing allowlist entries in `models.list`, and allow `sessions.patch`/`/model` selection for those refs without false `model not allowed` errors. (#20291) Thanks @kensipe, @nikolasdehor, and @vincentkoc.
+- Control UI/Agents: inherit `agents.defaults.model.fallbacks` in the Overview fallback input when no per-agent model entry exists, while preserving explicit per-agent fallback overrides (including empty lists). (#25729, #25710) Thanks @Suko.
 - Automation/Subagent/Cron reliability: honor `ANNOUNCE_SKIP` in `sessions_spawn` completion/direct announce flows (no user-visible token leaks), add transient direct-announce retries for channel unavailability (for example WhatsApp listener reconnect windows), and include `cron` in the `coding` tool profile so `/tools/invoke` can execute cron actions when explicitly allowed by gateway policy. (#25800, #25656, #25842, #25813, #25822, #25821) Thanks @astra-fer, @aaajiao, @dwight11232-coder, @kevinWangSheng, @widingmarcus-cyber, and @stakeswky.
 - Discord/Proxy + reactions + model picker: thread channel proxy fetch into inbound media/sticker downloads, use proxy-aware gateway metadata fetch for WSL/corporate proxy setups, wire `messages.statusReactions.{emojis,timing}` into Discord reaction lifecycle control, and compact model-picker `custom_id` keys to stay under Discord's 100-char limit while keeping backward-compatible parsing. (#25232, #25507, #25564, #25695) Thanks @openperf, @chilu18, @Yipsh, @lbo728, and @s1korrrr.
 - Discord/Block streaming: restore block-streamed reply delivery by suppressing only reasoning payloads (instead of all `block` payloads), fixing missing Discord replies in `channels.discord.streaming=block` mode. (#25839, #25836, #25792) Thanks @pewallin.

ui/src/ui/views/agents-utils.test.ts

@@ -0,0 +1,42 @@
+import { describe, expect, it } from "vitest";
+import { resolveEffectiveModelFallbacks } from "./agents-utils.ts";
+
+describe("resolveEffectiveModelFallbacks", () => {
+  it("inherits defaults when no entry fallbacks are configured", () => {
+    const entryModel = undefined;
+    const defaultModel = {
+      primary: "openai/gpt-5-nano",
+      fallbacks: ["google/gemini-2.0-flash"],
+    };
+
+    expect(resolveEffectiveModelFallbacks(entryModel, defaultModel)).toEqual([
+      "google/gemini-2.0-flash",
+    ]);
+  });
+
+  it("prefers entry fallbacks over defaults", () => {
+    const entryModel = {
+      primary: "openai/gpt-5-mini",
+      fallbacks: ["openai/gpt-5-nano"],
+    };
+    const defaultModel = {
+      primary: "openai/gpt-5",
+      fallbacks: ["google/gemini-2.0-flash"],
+    };
+
+    expect(resolveEffectiveModelFallbacks(entryModel, defaultModel)).toEqual(["openai/gpt-5-nano"]);
+  });
+
+  it("keeps explicit empty entry fallback lists", () => {
+    const entryModel = {
+      primary: "openai/gpt-5-mini",
+      fallbacks: [],
+    };
+    const defaultModel = {
+      primary: "openai/gpt-5",
+      fallbacks: ["google/gemini-2.0-flash"],
+    };
+
+    expect(resolveEffectiveModelFallbacks(entryModel, defaultModel)).toEqual([]);
+  });
+});

ui/src/ui/views/agents-utils.ts

@@ -244,6 +244,13 @@ export function resolveModelFallbacks(model?: unknown): string[] | null {
   return null;
 }
 
+export function resolveEffectiveModelFallbacks(
+  entryModel?: unknown,
+  defaultModel?: unknown,
+): string[] | null {
+  return resolveModelFallbacks(entryModel) ?? resolveModelFallbacks(defaultModel);
+}
+
 export function parseFallbackList(value: string): string[] {
   return value
     .split(",")

ui/src/ui/views/agents.ts

@@ -24,7 +24,7 @@ import {
   parseFallbackList,
   resolveAgentConfig,
   resolveAgentEmoji,
-  resolveModelFallbacks,
+  resolveEffectiveModelFallbacks,
   resolveModelLabel,
   resolveModelPrimary,
 } from "./agents-utils.ts";
@@ -390,7 +390,10 @@ function renderAgentOverview(params: {
     resolveModelPrimary(config.defaults?.model) ||
     (defaultModel !== "-" ? normalizeModelValue(defaultModel) : null);
   const effectivePrimary = modelPrimary ?? defaultPrimary ?? null;
-  const modelFallbacks = resolveModelFallbacks(config.entry?.model);
+  const modelFallbacks = resolveEffectiveModelFallbacks(
+    config.entry?.model,
+    config.defaults?.model,
+  );
   const fallbackText = modelFallbacks ? modelFallbacks.join(", ") : "";
   const identityName =
     agentIdentity?.name?.trim() ||

vitest.config.ts

@@ -37,6 +37,7 @@ export default defineConfig({
       "src/**/*.test.ts",
       "extensions/**/*.test.ts",
       "test/**/*.test.ts",
+      "ui/src/ui/views/agents-utils.test.ts",
       "ui/src/ui/views/usage-render-details.test.ts",
       "ui/src/ui/controllers/agents.test.ts",
     ],