diff --git a/ui/src/api/queries/alertNotifications.ts b/ui/src/api/queries/alertNotifications.ts
new file mode 100644
index 00000000..68f86ea8
--- /dev/null
+++ b/ui/src/api/queries/alertNotifications.ts
@@ -0,0 +1,54 @@
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+import type { components } from '../schema';
+import { apiClient, useSelectedEnv } from './alertMeta';
+
+export type AlertNotificationDto = components['schemas']['AlertNotificationDto'];
+
+// NOTE ON TYPES: the generated OpenAPI schema for env-scoped alert-notification
+// endpoints emits `path?: never` plus a `query.env: Environment` parameter
+// because the server resolves the env via the `@EnvPath` argument resolver,
+// which the OpenAPI scanner does not recognise as a path variable. At runtime
+// the URL template `{envSlug}` is substituted from `params.path.envSlug` by
+// openapi-fetch regardless of what the TS types say; we therefore cast the
+// call options to `any` on each call to bypass the generated type oddity.
+
+/** List notifications for a given alert instance. */
+export function useAlertNotifications(alertId: string | undefined) {
+  const env = useSelectedEnv();
+  return useQuery({
+    queryKey: ['alertNotifications', env, alertId],
+    enabled: !!env && !!alertId,
+    queryFn: async () => {
+      if (!env || !alertId) throw new Error('no env/alertId');
+      const { data, error } = await apiClient.GET(
+        '/environments/{envSlug}/alerts/{alertId}/notifications',
+        {
+          params: { path: { envSlug: env, alertId } },
+        } as any,
+      );
+      if (error) throw error;
+      return data as AlertNotificationDto[];
+    },
+  });
+}
+
+/** Retry a failed notification. Uses the flat path — notification IDs are
+ * globally unique across environments, so the endpoint is not env-scoped.
+ */
+export function useRetryNotification() {
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: async (id: string) => {
+      const { error } = await apiClient.POST(
+        '/alerts/notifications/{id}/retry',
+        {
+          params: { path: { id } },
+        } as any,
+      );
+      if (error) throw error;
+    },
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: ['alertNotifications'] });
+    },
+  });
+}
diff --git a/ui/src/api/queries/alertSilences.test.tsx b/ui/src/api/queries/alertSilences.test.tsx
new file mode 100644
index 00000000..d9f5b207
--- /dev/null
+++ b/ui/src/api/queries/alertSilences.test.tsx
@@ -0,0 +1,39 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { renderHook, waitFor } from '@testing-library/react';
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import type { ReactNode } from 'react';
+import { useEnvironmentStore } from '../environment-store';
+
+vi.mock('../client', () => ({
+  api: { GET: vi.fn(), POST: vi.fn(), PUT: vi.fn(), DELETE: vi.fn() },
+}));
+
+import { api as apiClient } from '../client';
+import { useAlertSilences } from './alertSilences';
+
+function wrapper({ children }: { children: ReactNode }) {
+  const qc = new QueryClient({
+    defaultOptions: {
+      queries: { retry: false },
+      mutations: { retry: false },
+    },
+  });
+  return <QueryClientProvider client={qc}>{children}</QueryClientProvider>;
+}
+
+describe('useAlertSilences', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    useEnvironmentStore.setState({ environment: 'dev' });
+  });
+
+  it('fetches silences for selected env', async () => {
+    (apiClient.GET as any).mockResolvedValue({ data: [], error: null });
+    const { result } = renderHook(() => useAlertSilences(), { wrapper });
+    await waitFor(() => expect(result.current.isSuccess).toBe(true));
+    expect(apiClient.GET).toHaveBeenCalledWith(
+      '/environments/{envSlug}/alerts/silences',
+      { params: { path: { envSlug: 'dev' } } },
+    );
+  });
+});
diff --git a/ui/src/api/queries/alertSilences.ts b/ui/src/api/queries/alertSilences.ts
new file mode 100644
index 00000000..ce03dcab
--- /dev/null
+++ b/ui/src/api/queries/alertSilences.ts
@@ -0,0 +1,101 @@
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
+import type { components } from '../schema';
+import { apiClient, useSelectedEnv } from './alertMeta';
+
+export type AlertSilenceResponse = components['schemas']['AlertSilenceResponse'];
+export type AlertSilenceRequest = components['schemas']['AlertSilenceRequest'];
+
+// NOTE ON TYPES: the generated OpenAPI schema for env-scoped alert-silence
+// endpoints emits `path?: never` plus a `query.env: Environment` parameter
+// because the server resolves the env via the `@EnvPath` argument resolver,
+// which the OpenAPI scanner does not recognise as a path variable. At runtime
+// the URL template `{envSlug}` is substituted from `params.path.envSlug` by
+// openapi-fetch regardless of what the TS types say; we therefore cast the
+// call options to `any` on each call to bypass the generated type oddity.
+
+/** List alert silences in the current env. */
+export function useAlertSilences() {
+  const env = useSelectedEnv();
+  return useQuery({
+    queryKey: ['alertSilences', env],
+    enabled: !!env,
+    queryFn: async () => {
+      if (!env) throw new Error('no env');
+      const { data, error } = await apiClient.GET(
+        '/environments/{envSlug}/alerts/silences',
+        {
+          params: { path: { envSlug: env } },
+        } as any,
+      );
+      if (error) throw error;
+      return data as AlertSilenceResponse[];
+    },
+  });
+}
+
+/** Create a new alert silence in the current env. */
+export function useCreateSilence() {
+  const qc = useQueryClient();
+  const env = useSelectedEnv();
+  return useMutation({
+    mutationFn: async (req: AlertSilenceRequest) => {
+      if (!env) throw new Error('no env');
+      const { data, error } = await apiClient.POST(
+        '/environments/{envSlug}/alerts/silences',
+        {
+          params: { path: { envSlug: env } },
+          body: req,
+        } as any,
+      );
+      if (error) throw error;
+      return data as AlertSilenceResponse;
+    },
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: ['alertSilences', env] });
+    },
+  });
+}
+
+/** Update an existing alert silence. */
+export function useUpdateSilence(id: string) {
+  const qc = useQueryClient();
+  const env = useSelectedEnv();
+  return useMutation({
+    mutationFn: async (req: AlertSilenceRequest) => {
+      if (!env) throw new Error('no env');
+      const { data, error } = await apiClient.PUT(
+        '/environments/{envSlug}/alerts/silences/{id}',
+        {
+          params: { path: { envSlug: env, id } },
+          body: req,
+        } as any,
+      );
+      if (error) throw error;
+      return data as AlertSilenceResponse;
+    },
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: ['alertSilences', env] });
+    },
+  });
+}
+
+/** Delete an alert silence. */
+export function useDeleteSilence() {
+  const qc = useQueryClient();
+  const env = useSelectedEnv();
+  return useMutation({
+    mutationFn: async (id: string) => {
+      if (!env) throw new Error('no env');
+      const { error } = await apiClient.DELETE(
+        '/environments/{envSlug}/alerts/silences/{id}',
+        {
+          params: { path: { envSlug: env, id } },
+        } as any,
+      );
+      if (error) throw error;
+    },
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: ['alertSilences', env] });
+    },
+  });
+}