diff --git a/apps/web/src/hooks/use-pipeline-processor.ts b/apps/web/src/hooks/use-pipeline-processor.ts
index de9c79d2..3e2378b0 100644
--- a/apps/web/src/hooks/use-pipeline-processor.ts
+++ b/apps/web/src/hooks/use-pipeline-processor.ts
@@ -145,7 +145,14 @@ export function usePipelineProcessor() {
         } else {
           try {
             const body = JSON.parse(xhr.responseText);
-            setError(parseApiError(body, xhr.status));
+            const parsed = parseApiError(body, xhr.status);
+            if (typeof parsed === "object" && parsed.type === "feature_not_installed") {
+              setError(
+                `Feature "${parsed.featureName}" is not installed. Enable it in Settings → AI Features.`,
+              );
+            } else {
+              setError(parsed as string);
+            }
           } catch {
             setError(`Processing failed: ${xhr.status}`);
           }
@@ -270,7 +277,12 @@ export function usePipelineProcessor() {
                 errorMsg += ` (${body.errors.length} files failed)`;
               }
             } else {
-              errorMsg = parseApiError(body, response.status);
+              const parsed = parseApiError(body, response.status);
+              if (typeof parsed === "object" && parsed.type === "feature_not_installed") {
+                errorMsg = `Feature "${parsed.featureName}" is not installed. Enable it in Settings → AI Features.`;
+              } else {
+                errorMsg = parsed as string;
+              }
             }
           } catch {
             errorMsg = `Batch processing failed: ${response.status}`;
diff --git a/apps/web/src/hooks/use-tool-processor.ts b/apps/web/src/hooks/use-tool-processor.ts
index 7975fbec..65dd7684 100644
--- a/apps/web/src/hooks/use-tool-processor.ts
+++ b/apps/web/src/hooks/use-tool-processor.ts
@@ -233,7 +233,14 @@ export function useToolProcessor(toolId: string) {
         } else {
           try {
             const body = JSON.parse(xhr.responseText);
-            setError(parseApiError(body, xhr.status));
+            const parsed = parseApiError(body, xhr.status);
+            if (typeof parsed === "object" && parsed.type === "feature_not_installed") {
+              setError(
+                `Feature "${parsed.featureName}" is not installed. Enable it in Settings → AI Features.`,
+              );
+            } else {
+              setError(parsed as string);
+            }
           } catch {
             setError(`Processing failed: ${xhr.status}`);
           }
@@ -354,7 +361,12 @@ export function useToolProcessor(toolId: string) {
           let errorMsg: string;
           try {
             const body = JSON.parse(text);
-            errorMsg = parseApiError(body, response.status);
+            const parsed = parseApiError(body, response.status);
+            if (typeof parsed === "object" && parsed.type === "feature_not_installed") {
+              errorMsg = `Feature "${parsed.featureName}" is not installed. Enable it in Settings → AI Features.`;
+            } else {
+              errorMsg = parsed as string;
+            }
           } catch {
             errorMsg = `Batch processing failed: ${response.status}`;
           }
diff --git a/apps/web/src/lib/api.ts b/apps/web/src/lib/api.ts
index f8b09f30..05da8b43 100644
--- a/apps/web/src/lib/api.ts
+++ b/apps/web/src/lib/api.ts
@@ -1,6 +1,25 @@
 const API_BASE = "/api";
 
-export function parseApiError(body: Record<string, unknown>, fallbackStatus: number): string {
+export interface FeatureNotInstalledError {
+  type: "feature_not_installed";
+  feature: string;
+  featureName: string;
+  estimatedSize: string;
+}
+
+export function parseApiError(
+  body: Record<string, unknown>,
+  fallbackStatus: number,
+): string | FeatureNotInstalledError {
+  if (body.code === "FEATURE_NOT_INSTALLED") {
+    return {
+      type: "feature_not_installed",
+      feature: body.feature as string,
+      featureName: body.featureName as string,
+      estimatedSize: body.estimatedSize as string,
+    };
+  }
+
   const error = typeof body.error === "string" ? body.error : "";
   const details = body.details;
   if (!details) {
diff --git a/apps/web/src/stores/features-store.ts b/apps/web/src/stores/features-store.ts
new file mode 100644
index 00000000..2d833a7a
--- /dev/null
+++ b/apps/web/src/stores/features-store.ts
@@ -0,0 +1,48 @@
+import type { FeatureBundleState } from "@ashim/shared";
+import { TOOL_BUNDLE_MAP } from "@ashim/shared";
+import { create } from "zustand";
+import { apiGet } from "@/lib/api";
+
+interface FeaturesState {
+  bundles: FeatureBundleState[];
+  loaded: boolean;
+  fetch: () => Promise<void>;
+  refresh: () => Promise<void>;
+  isToolInstalled: (toolId: string) => boolean;
+  getBundleForTool: (toolId: string) => FeatureBundleState | null;
+}
+
+export const useFeaturesStore = create<FeaturesState>((set, get) => ({
+  bundles: [],
+  loaded: false,
+
+  fetch: async () => {
+    if (get().loaded) return;
+    try {
+      const data = await apiGet<{ bundles: FeatureBundleState[] }>("/v1/features");
+      set({ bundles: data.bundles, loaded: true });
+    } catch {
+      set({ loaded: true });
+    }
+  },
+
+  refresh: async () => {
+    try {
+      const data = await apiGet<{ bundles: FeatureBundleState[] }>("/v1/features");
+      set({ bundles: data.bundles, loaded: true });
+    } catch {}
+  },
+
+  isToolInstalled: (toolId: string) => {
+    const bundleId = TOOL_BUNDLE_MAP[toolId];
+    if (!bundleId) return true;
+    const bundle = get().bundles.find((b) => b.id === bundleId);
+    return bundle?.status === "installed";
+  },
+
+  getBundleForTool: (toolId: string) => {
+    const bundleId = TOOL_BUNDLE_MAP[toolId];
+    if (!bundleId) return null;
+    return get().bundles.find((b) => b.id === bundleId) ?? null;
+  },
+}));