diff --git a/web/src/lib/__tests__/handleUiAction.test.ts b/web/src/lib/__tests__/handleUiAction.test.ts
new file mode 100644
index 00000000..fafd83b6
--- /dev/null
+++ b/web/src/lib/__tests__/handleUiAction.test.ts
@@ -0,0 +1,23 @@
+import { describe, expect, it, vi } from "vitest";
+import { handleUiAction } from "../handleUiAction";
+
+describe("handleUiAction", () => {
+  it("surfaces a rejected action without rethrowing it", async () => {
+    const setError = vi.fn();
+
+    await expect(
+      handleUiAction(() => Promise.reject(new Error("boom")), setError)
+    ).resolves.toBeUndefined();
+
+    expect(setError).toHaveBeenCalledOnce();
+    expect(setError).toHaveBeenCalledWith("boom");
+  });
+
+  it("converts non-Error rejections to a readable message", async () => {
+    const setError = vi.fn();
+
+    await handleUiAction(() => Promise.reject("offline"), setError);
+
+    expect(setError).toHaveBeenCalledWith("offline");
+  });
+});
diff --git a/web/src/lib/handleUiAction.ts b/web/src/lib/handleUiAction.ts
new file mode 100644
index 00000000..95086650
--- /dev/null
+++ b/web/src/lib/handleUiAction.ts
@@ -0,0 +1,10 @@
+export async function handleUiAction(
+  action: () => Promise<unknown>,
+  setError: (message: string) => void
+): Promise<void> {
+  try {
+    await action();
+  } catch (error) {
+    setError(error instanceof Error ? error.message : String(error));
+  }
+}
diff --git a/web/src/pages/Events.tsx b/web/src/pages/Events.tsx
index 762becc2..2a490b00 100644
--- a/web/src/pages/Events.tsx
+++ b/web/src/pages/Events.tsx
@@ -6,6 +6,7 @@ import {
   WebhookRegistrationData,
 } from "../lib/api";
 import { useTranslation } from "react-i18next";
+import { handleUiAction } from "../lib/handleUiAction";
 
 function fmtTime(value: string | number | null): string {
   if (value === null) return "-";
@@ -419,7 +420,10 @@ export function Events() {
                   className="btn-ghost btn-sm"
                   onClick={() => {
                     setFilterType(type);
-                    api.eventsList({ type, limit: 100 }).then((result) => setEvents(result.data.events));
+                    void handleUiAction(async () => {
+                      const result = await api.eventsList({ type, limit: 100 });
+                      setEvents(result.data.events);
+                    }, setError);
                   }}
                 >
                   {type}
diff --git a/web/src/pages/Network.tsx b/web/src/pages/Network.tsx
index 5ccbb02e..ef167ceb 100644
--- a/web/src/pages/Network.tsx
+++ b/web/src/pages/Network.tsx
@@ -10,6 +10,7 @@ import {
 } from "../lib/api";
 import { toast } from "../lib/toast-store";
 import { useTranslation } from "react-i18next";
+import { handleUiAction } from "../lib/handleUiAction";
 
 const TRUST_LEVELS: NetworkTrustLevel[] = ["trusted", "verified", "untrusted"];
 const AGENT_STATUSES: NetworkAgentStatus[] = ["available", "busy", "offline", "degraded"];
@@ -327,18 +328,24 @@ export function Network() {
   };
 
   const updateTrust = async (agent: NetworkAgentData, trustLevel: NetworkTrustLevel) => {
-    await api.updateNetworkAgentTrust(agent.id, { trustLevel });
-    await load();
+    await handleUiAction(async () => {
+      await api.updateNetworkAgentTrust(agent.id, { trustLevel });
+      await load();
+    }, setLastError);
   };
 
   const toggleBlocked = async (agent: NetworkAgentData) => {
-    await api.updateNetworkAgentTrust(agent.id, { blocked: !agent.blocked });
-    await load();
+    await handleUiAction(async () => {
+      await api.updateNetworkAgentTrust(agent.id, { blocked: !agent.blocked });
+      await load();
+    }, setLastError);
   };
 
   const removeAgent = async (agent: NetworkAgentData) => {
-    await api.removeNetworkAgent(agent.id);
-    await load();
+    await handleUiAction(async () => {
+      await api.removeNetworkAgent(agent.id);
+      await load();
+    }, setLastError);
   };
 
   const delegateTask = async () => {