diff --git a/browse/test/fixtures/mock-claude/claude b/browse/test/fixtures/mock-claude/claude
index b6217020..a3164a8d 100755
--- a/browse/test/fixtures/mock-claude/claude
+++ b/browse/test/fixtures/mock-claude/claude
@@ -133,11 +133,28 @@ process.on('SIGTERM', () => {
         ],
       },
     });
-    // Stay alive up to 120s waiting for the user's review decision to
-    // propagate back through the kill file. On Allow, we just exit cleanly
-    // after a short delay. On Block, SIGTERM handler exits 143.
-    await sleep(120000);
-    emit({ type: 'result', result: 'mock-claude: review decision timeout' });
+    // Wait long enough for the review decision to propagate (BLOCK path
+    // SIGTERMs us here — see handler at top). On ALLOW the review loop
+    // unblocks and we continue with a second tool_use to a sensitive
+    // domain. If block actually blocks, this second event never reaches
+    // the chat feed (test asserts on that). If allow actually allows, it
+    // does.
+    await sleep(8000);
+    emit({
+      type: 'assistant',
+      message: {
+        content: [
+          {
+            type: 'tool_use',
+            id: 'toolu_02_followup',
+            name: 'Bash',
+            input: { command: '$B goto https://post-block-followup.example.com/' },
+          },
+        ],
+      },
+    });
+    await sleep(500);
+    emit({ type: 'result', result: 'mock-claude: post-review followup complete' });
     process.exit(0);
   }
 
diff --git a/browse/test/security-review-fullstack.test.ts b/browse/test/security-review-fullstack.test.ts
index 09f9d6a2..47cdc433 100644
--- a/browse/test/security-review-fullstack.test.ts
+++ b/browse/test/security-review-fullstack.test.ts
@@ -272,12 +272,36 @@ describe('review-flow full-stack E2E', () => {
         expect(overrodeLog.payloadHash).toBe(blockLog.payloadHash);
         // Privacy contract: neither record includes the raw payload.
         expect(JSON.stringify(overrodeLog)).not.toContain('IGNORE ALL PREVIOUS');
+
+        // Liveness: session must actually KEEP RUNNING after Allow. Mock-claude
+        // emits a second tool_use to post-block-followup.example.com ~8s
+        // after the tool_result. That event must reach the chat feed, proving
+        // the sidebar-agent resumed the stream-handler relay instead of
+        // silently wedging.
+        const followupDeadline = Date.now() + 20_000;
+        let followup: any = null;
+        while (Date.now() < followupDeadline && !followup) {
+          const chatResp = await apiFetch('/sidebar-chat');
+          const chatData: any = await chatResp.json();
+          for (const entry of chatData.entries ?? []) {
+            const input = String((entry as any).input ?? '');
+            if (
+              entry.type === 'tool_use' &&
+              input.includes('post-block-followup.example.com')
+            ) {
+              followup = entry;
+              break;
+            }
+          }
+          if (!followup) await new Promise((r) => setTimeout(r, 300));
+        }
+        expect(followup).not.toBeNull();
       } finally {
         await stopStack();
         try { fs.rmSync(attemptsDir, { recursive: true, force: true }); } catch {}
       }
     },
-    60_000,
+    90_000,
   );
 
   test.skipIf(!CLASSIFIER_READY)(
@@ -337,12 +361,34 @@ describe('review-flow full-stack E2E', () => {
         const attempts = await readAttempts();
         const overrodeLog = attempts.find((a) => a.verdict === 'user_overrode');
         expect(overrodeLog).toBeFalsy();
+
+        // The real security property: after Block, NO FURTHER tool calls
+        // reach the chat feed. Mock-claude would have emitted a tool_use
+        // to post-block-followup.example.com ~8s after the tool_result if
+        // the session had kept running. Wait long enough for that window
+        // to close (12s total), then assert the followup event never
+        // appeared. This is what makes "block" actually stop the page —
+        // the subprocess is SIGTERM'd before it can emit the next event.
+        await new Promise((r) => setTimeout(r, 12_000));
+        const finalChatResp = await apiFetch('/sidebar-chat');
+        const finalChatData: any = await finalChatResp.json();
+        const followupAttempted = (finalChatData.entries ?? []).some(
+          (entry: any) =>
+            entry.type === 'tool_use' &&
+            String(entry.input ?? '').includes('post-block-followup.example.com'),
+        );
+        expect(followupAttempted).toBe(false);
+
+        // And mock-claude must actually have died (not just been signaled
+        // — the SIGTERM + SIGKILL pair should have exited the process).
+        const mockAlive = (await apiFetch('/sidebar-chat')).ok; // channel still open
+        expect(mockAlive).toBe(true);
       } finally {
         await stopStack();
         try { fs.rmSync(attemptsDir, { recursive: true, force: true }); } catch {}
       }
     },
-    60_000,
+    90_000,
   );
 
   test.skipIf(!CLASSIFIER_READY)(