diff --git a/src/plugins/bundled-capability-metadata.test.ts b/src/plugins/bundled-capability-metadata.test.ts
index 32104012ae8..683e471259f 100644
--- a/src/plugins/bundled-capability-metadata.test.ts
+++ b/src/plugins/bundled-capability-metadata.test.ts
@@ -5,41 +5,48 @@ import {
   BUNDLED_LEGACY_PLUGIN_ID_ALIASES,
   BUNDLED_PLUGIN_CONTRACT_SNAPSHOTS,
 } from "./contracts/inventory/bundled-capability-metadata.js";
-
-function uniqueStrings(values: readonly string[] | undefined): string[] {
-  const result: string[] = [];
-  const seen = new Set<string>();
-  for (const value of values ?? []) {
-    const normalized = value.trim();
-    if (!normalized || seen.has(normalized)) {
-      continue;
-    }
-    seen.add(normalized);
-    result.push(normalized);
-  }
-  return result;
-}
+import { uniqueStrings } from "./contracts/shared.js";
 
 describe("bundled capability metadata", () => {
   it("keeps contract snapshots aligned with bundled plugin manifests", () => {
     const expected = listBundledPluginMetadata()
       .map(({ manifest }) => ({
         pluginId: manifest.id,
-        providerIds: uniqueStrings(manifest.providers),
-        speechProviderIds: uniqueStrings(manifest.contracts?.speechProviders),
+        providerIds: uniqueStrings(manifest.providers, (value) => value.trim()),
+        speechProviderIds: uniqueStrings(manifest.contracts?.speechProviders, (value) =>
+          value.trim(),
+        ),
         realtimeTranscriptionProviderIds: uniqueStrings(
           manifest.contracts?.realtimeTranscriptionProviders,
+          (value) => value.trim(),
+        ),
+        realtimeVoiceProviderIds: uniqueStrings(
+          manifest.contracts?.realtimeVoiceProviders,
+          (value) => value.trim(),
         ),
-        realtimeVoiceProviderIds: uniqueStrings(manifest.contracts?.realtimeVoiceProviders),
         mediaUnderstandingProviderIds: uniqueStrings(
           manifest.contracts?.mediaUnderstandingProviders,
+          (value) => value.trim(),
         ),
-        imageGenerationProviderIds: uniqueStrings(manifest.contracts?.imageGenerationProviders),
-        videoGenerationProviderIds: uniqueStrings(manifest.contracts?.videoGenerationProviders),
-        musicGenerationProviderIds: uniqueStrings(manifest.contracts?.musicGenerationProviders),
-        webFetchProviderIds: uniqueStrings(manifest.contracts?.webFetchProviders),
-        webSearchProviderIds: uniqueStrings(manifest.contracts?.webSearchProviders),
-        toolNames: uniqueStrings(manifest.contracts?.tools),
+        imageGenerationProviderIds: uniqueStrings(
+          manifest.contracts?.imageGenerationProviders,
+          (value) => value.trim(),
+        ),
+        videoGenerationProviderIds: uniqueStrings(
+          manifest.contracts?.videoGenerationProviders,
+          (value) => value.trim(),
+        ),
+        musicGenerationProviderIds: uniqueStrings(
+          manifest.contracts?.musicGenerationProviders,
+          (value) => value.trim(),
+        ),
+        webFetchProviderIds: uniqueStrings(manifest.contracts?.webFetchProviders, (value) =>
+          value.trim(),
+        ),
+        webSearchProviderIds: uniqueStrings(manifest.contracts?.webSearchProviders, (value) =>
+          value.trim(),
+        ),
+        toolNames: uniqueStrings(manifest.contracts?.tools, (value) => value.trim()),
       }))
       .filter(
         (entry) =>
diff --git a/src/plugins/contracts/inventory/bundled-capability-metadata.ts b/src/plugins/contracts/inventory/bundled-capability-metadata.ts
index fc666a0b3b7..ca8dd9270cf 100644
--- a/src/plugins/contracts/inventory/bundled-capability-metadata.ts
+++ b/src/plugins/contracts/inventory/bundled-capability-metadata.ts
@@ -1,4 +1,5 @@
 import { listBundledPluginMetadata } from "../../bundled-plugin-metadata.js";
+import { uniqueStrings } from "../shared.js";
 
 // Build/test inventory only.
 // Runtime code should prefer manifest/runtime registry queries instead of these snapshots.
@@ -19,20 +20,6 @@ export type BundledPluginContractSnapshot = {
   toolNames: string[];
 };
 
-function uniqueStrings(values: readonly string[] | undefined): string[] {
-  const result: string[] = [];
-  const seen = new Set<string>();
-  for (const value of values ?? []) {
-    const normalized = value.trim();
-    if (!normalized || seen.has(normalized)) {
-      continue;
-    }
-    seen.add(normalized);
-    result.push(normalized);
-  }
-  return result;
-}
-
 const BUNDLED_PLUGIN_METADATA_FOR_CAPABILITIES = listBundledPluginMetadata({
   includeChannelConfigs: false,
   includeSyntheticChannelConfigs: false,
@@ -41,20 +28,39 @@ const BUNDLED_PLUGIN_METADATA_FOR_CAPABILITIES = listBundledPluginMetadata({
 export const BUNDLED_PLUGIN_CONTRACT_SNAPSHOTS: readonly BundledPluginContractSnapshot[] =
   BUNDLED_PLUGIN_METADATA_FOR_CAPABILITIES.map(({ manifest }) => ({
     pluginId: manifest.id,
-    cliBackendIds: uniqueStrings(manifest.cliBackends),
-    providerIds: uniqueStrings(manifest.providers),
-    speechProviderIds: uniqueStrings(manifest.contracts?.speechProviders),
+    cliBackendIds: uniqueStrings(manifest.cliBackends, (value) => value.trim()),
+    providerIds: uniqueStrings(manifest.providers, (value) => value.trim()),
+    speechProviderIds: uniqueStrings(manifest.contracts?.speechProviders, (value) => value.trim()),
     realtimeTranscriptionProviderIds: uniqueStrings(
       manifest.contracts?.realtimeTranscriptionProviders,
+      (value) => value.trim(),
     ),
-    realtimeVoiceProviderIds: uniqueStrings(manifest.contracts?.realtimeVoiceProviders),
-    mediaUnderstandingProviderIds: uniqueStrings(manifest.contracts?.mediaUnderstandingProviders),
-    imageGenerationProviderIds: uniqueStrings(manifest.contracts?.imageGenerationProviders),
-    videoGenerationProviderIds: uniqueStrings(manifest.contracts?.videoGenerationProviders),
-    musicGenerationProviderIds: uniqueStrings(manifest.contracts?.musicGenerationProviders),
-    webFetchProviderIds: uniqueStrings(manifest.contracts?.webFetchProviders),
-    webSearchProviderIds: uniqueStrings(manifest.contracts?.webSearchProviders),
-    toolNames: uniqueStrings(manifest.contracts?.tools),
+    realtimeVoiceProviderIds: uniqueStrings(manifest.contracts?.realtimeVoiceProviders, (value) =>
+      value.trim(),
+    ),
+    mediaUnderstandingProviderIds: uniqueStrings(
+      manifest.contracts?.mediaUnderstandingProviders,
+      (value) => value.trim(),
+    ),
+    imageGenerationProviderIds: uniqueStrings(
+      manifest.contracts?.imageGenerationProviders,
+      (value) => value.trim(),
+    ),
+    videoGenerationProviderIds: uniqueStrings(
+      manifest.contracts?.videoGenerationProviders,
+      (value) => value.trim(),
+    ),
+    musicGenerationProviderIds: uniqueStrings(
+      manifest.contracts?.musicGenerationProviders,
+      (value) => value.trim(),
+    ),
+    webFetchProviderIds: uniqueStrings(manifest.contracts?.webFetchProviders, (value) =>
+      value.trim(),
+    ),
+    webSearchProviderIds: uniqueStrings(manifest.contracts?.webSearchProviders, (value) =>
+      value.trim(),
+    ),
+    toolNames: uniqueStrings(manifest.contracts?.tools, (value) => value.trim()),
   }))
     .filter(
       (entry) =>
diff --git a/src/plugins/contracts/registry.ts b/src/plugins/contracts/registry.ts
index b613a5465e7..323af38a82c 100644
--- a/src/plugins/contracts/registry.ts
+++ b/src/plugins/contracts/registry.ts
@@ -16,6 +16,7 @@ import type {
   WebSearchProviderPlugin,
 } from "../types.js";
 import { BUNDLED_PLUGIN_CONTRACT_SNAPSHOTS } from "./inventory/bundled-capability-metadata.js";
+import { uniqueStrings } from "./shared.js";
 import {
   loadVitestImageGenerationProviderContractRegistry,
   loadVitestMediaUnderstandingProviderContractRegistry,
@@ -79,19 +80,6 @@ type ManifestContractKey =
 
 type ManifestRegistryContractKey = "webFetchProviders" | "webSearchProviders";
 
-function uniqueStrings(values: readonly string[]): string[] {
-  const result: string[] = [];
-  const seen = new Set<string>();
-  for (const value of values) {
-    if (seen.has(value)) {
-      continue;
-    }
-    seen.add(value);
-    result.push(value);
-  }
-  return result;
-}
-
 function resolveBundledManifestContracts(): PluginRegistrationContractEntry[] {
   if (process.env.VITEST) {
     return BUNDLED_PLUGIN_CONTRACT_SNAPSHOTS.map((entry) => ({
diff --git a/src/plugins/contracts/shared.ts b/src/plugins/contracts/shared.ts
new file mode 100644
index 00000000000..46572fdeb34
--- /dev/null
+++ b/src/plugins/contracts/shared.ts
@@ -0,0 +1,16 @@
+export function uniqueStrings(
+  values: readonly string[] | undefined,
+  normalize: (value: string) => string = (value) => value,
+): string[] {
+  const result: string[] = [];
+  const seen = new Set<string>();
+  for (const value of values ?? []) {
+    const normalized = normalize(value);
+    if (!normalized || seen.has(normalized)) {
+      continue;
+    }
+    seen.add(normalized);
+    result.push(normalized);
+  }
+  return result;
+}