diff --git a/src/plugins/provider-registry-shared.test.ts b/src/plugins/provider-registry-shared.test.ts
new file mode 100644
index 00000000000..95c84c472ad
--- /dev/null
+++ b/src/plugins/provider-registry-shared.test.ts
@@ -0,0 +1,24 @@
+import { describe, expect, it } from "vitest";
+import {
+  buildCapabilityProviderMaps,
+  normalizeCapabilityProviderId,
+} from "./provider-registry-shared.js";
+
+describe("provider registry shared", () => {
+  it("normalizes provider ids case-insensitively", () => {
+    expect(normalizeCapabilityProviderId("  OpenAI  ")).toBe("openai");
+    expect(normalizeCapabilityProviderId("   ")).toBeUndefined();
+  });
+
+  it("indexes providers by id and alias", () => {
+    const { canonical, aliases } = buildCapabilityProviderMaps([
+      { id: "Microsoft", aliases: [" EDGE ", "ms"] },
+      { id: "OpenAI" },
+    ]);
+
+    expect([...canonical.keys()]).toEqual(["microsoft", "openai"]);
+    expect(aliases.get("edge")?.id).toBe("Microsoft");
+    expect(aliases.get("ms")?.id).toBe("Microsoft");
+    expect(aliases.get("openai")?.id).toBe("OpenAI");
+  });
+});
diff --git a/src/plugins/provider-registry-shared.ts b/src/plugins/provider-registry-shared.ts
new file mode 100644
index 00000000000..e840ae9e658
--- /dev/null
+++ b/src/plugins/provider-registry-shared.ts
@@ -0,0 +1,34 @@
+export function normalizeCapabilityProviderId(providerId: string | undefined): string | undefined {
+  const trimmed = providerId?.trim().toLowerCase();
+  return trimmed ? trimmed : undefined;
+}
+
+export function buildCapabilityProviderMaps<T extends { id: string; aliases?: readonly string[] }>(
+  providers: readonly T[],
+  normalizeId: (
+    providerId: string | undefined,
+  ) => string | undefined = normalizeCapabilityProviderId,
+): {
+  canonical: Map<string, T>;
+  aliases: Map<string, T>;
+} {
+  const canonical = new Map<string, T>();
+  const aliases = new Map<string, T>();
+
+  for (const provider of providers) {
+    const id = normalizeId(provider.id);
+    if (!id) {
+      continue;
+    }
+    canonical.set(id, provider);
+    aliases.set(id, provider);
+    for (const alias of provider.aliases ?? []) {
+      const normalizedAlias = normalizeId(alias);
+      if (normalizedAlias) {
+        aliases.set(normalizedAlias, provider);
+      }
+    }
+  }
+
+  return { canonical, aliases };
+}
diff --git a/src/realtime-voice/provider-registry.ts b/src/realtime-voice/provider-registry.ts
index b2de16385c1..c7146580b79 100644
--- a/src/realtime-voice/provider-registry.ts
+++ b/src/realtime-voice/provider-registry.ts
@@ -1,17 +1,16 @@
 import type { OpenClawConfig } from "../config/config.js";
 import { resolvePluginCapabilityProviders } from "../plugins/capability-provider-runtime.js";
+import {
+  buildCapabilityProviderMaps,
+  normalizeCapabilityProviderId,
+} from "../plugins/provider-registry-shared.js";
 import type { RealtimeVoiceProviderPlugin } from "../plugins/types.js";
 import type { RealtimeVoiceProviderId } from "./provider-types.js";
 
-function trimToUndefined(value: string | undefined): string | undefined {
-  const trimmed = value?.trim().toLowerCase();
-  return trimmed ? trimmed : undefined;
-}
-
 export function normalizeRealtimeVoiceProviderId(
   providerId: string | undefined,
 ): RealtimeVoiceProviderId | undefined {
-  return trimToUndefined(providerId);
+  return normalizeCapabilityProviderId(providerId);
 }
 
 function resolveRealtimeVoiceProviderEntries(cfg?: OpenClawConfig): RealtimeVoiceProviderPlugin[] {
@@ -25,28 +24,7 @@ function buildProviderMaps(cfg?: OpenClawConfig): {
   canonical: Map<string, RealtimeVoiceProviderPlugin>;
   aliases: Map<string, RealtimeVoiceProviderPlugin>;
 } {
-  const canonical = new Map<string, RealtimeVoiceProviderPlugin>();
-  const aliases = new Map<string, RealtimeVoiceProviderPlugin>();
-  const register = (provider: RealtimeVoiceProviderPlugin) => {
-    const id = normalizeRealtimeVoiceProviderId(provider.id);
-    if (!id) {
-      return;
-    }
-    canonical.set(id, provider);
-    aliases.set(id, provider);
-    for (const alias of provider.aliases ?? []) {
-      const normalizedAlias = normalizeRealtimeVoiceProviderId(alias);
-      if (normalizedAlias) {
-        aliases.set(normalizedAlias, provider);
-      }
-    }
-  };
-
-  for (const provider of resolveRealtimeVoiceProviderEntries(cfg)) {
-    register(provider);
-  }
-
-  return { canonical, aliases };
+  return buildCapabilityProviderMaps(resolveRealtimeVoiceProviderEntries(cfg));
 }
 
 export function listRealtimeVoiceProviders(cfg?: OpenClawConfig): RealtimeVoiceProviderPlugin[] {
diff --git a/src/tts/provider-registry.ts b/src/tts/provider-registry.ts
index 8d71f467d6a..1b9f3041499 100644
--- a/src/tts/provider-registry.ts
+++ b/src/tts/provider-registry.ts
@@ -1,17 +1,16 @@
 import type { OpenClawConfig } from "../config/config.js";
 import { resolvePluginCapabilityProviders } from "../plugins/capability-provider-runtime.js";
+import {
+  buildCapabilityProviderMaps,
+  normalizeCapabilityProviderId,
+} from "../plugins/provider-registry-shared.js";
 import type { SpeechProviderPlugin } from "../plugins/types.js";
 import type { SpeechProviderId } from "./provider-types.js";
 
-function trimToUndefined(value: string | undefined): string | undefined {
-  const trimmed = value?.trim().toLowerCase();
-  return trimmed ? trimmed : undefined;
-}
-
 export function normalizeSpeechProviderId(
   providerId: string | undefined,
 ): SpeechProviderId | undefined {
-  return trimToUndefined(providerId);
+  return normalizeCapabilityProviderId(providerId);
 }
 
 function resolveSpeechProviderPluginEntries(cfg?: OpenClawConfig): SpeechProviderPlugin[] {
@@ -25,28 +24,7 @@ function buildProviderMaps(cfg?: OpenClawConfig): {
   canonical: Map<string, SpeechProviderPlugin>;
   aliases: Map<string, SpeechProviderPlugin>;
 } {
-  const canonical = new Map<string, SpeechProviderPlugin>();
-  const aliases = new Map<string, SpeechProviderPlugin>();
-  const register = (provider: SpeechProviderPlugin) => {
-    const id = normalizeSpeechProviderId(provider.id);
-    if (!id) {
-      return;
-    }
-    canonical.set(id, provider);
-    aliases.set(id, provider);
-    for (const alias of provider.aliases ?? []) {
-      const normalizedAlias = normalizeSpeechProviderId(alias);
-      if (normalizedAlias) {
-        aliases.set(normalizedAlias, provider);
-      }
-    }
-  };
-
-  for (const provider of resolveSpeechProviderPluginEntries(cfg)) {
-    register(provider);
-  }
-
-  return { canonical, aliases };
+  return buildCapabilityProviderMaps(resolveSpeechProviderPluginEntries(cfg));
 }
 
 export function listSpeechProviders(cfg?: OpenClawConfig): SpeechProviderPlugin[] {