diff --git a/internal/js/helpers/stream-tool-sieve/parse.js b/internal/js/helpers/stream-tool-sieve/parse.js
index def46db..f1efdda 100644
--- a/internal/js/helpers/stream-tool-sieve/parse.js
+++ b/internal/js/helpers/stream-tool-sieve/parse.js
@@ -263,14 +263,6 @@ function filterToolCalls(parsed, toolNames) {
     }
     out.push({ name: tc.name, input: tc.input || {} });
   }
-  if (out.length === 0 && parsed.length > 0) {
-    for (const tc of parsed) {
-      if (!tc || !tc.name) {
-        continue;
-      }
-      out.push({ name: tc.name, input: tc.input || {} });
-    }
-  }
   return out;
 }
 
diff --git a/tests/node/stream-tool-sieve.test.js b/tests/node/stream-tool-sieve.test.js
index e96716b..2fc2ecc 100644
--- a/tests/node/stream-tool-sieve.test.js
+++ b/tests/node/stream-tool-sieve.test.js
@@ -52,11 +52,19 @@ test('parseToolCalls keeps non-object argument strings as _raw (Go parity)', ()
   ]);
 });
 
-test('parseToolCalls still intercepts unknown schema names to avoid leaks', () => {
+test('parseToolCalls drops unknown schema names when toolNames is provided', () => {
   const payload = JSON.stringify({
     tool_calls: [{ name: 'not_in_schema', input: { q: 'go' } }],
   });
   const calls = parseToolCalls(payload, ['search']);
+  assert.equal(calls.length, 0);
+});
+
+test('parseToolCalls keeps unknown names when toolNames is empty', () => {
+  const payload = JSON.stringify({
+    tool_calls: [{ name: 'not_in_schema', input: { q: 'go' } }],
+  });
+  const calls = parseToolCalls(payload, []);
   assert.equal(calls.length, 1);
   assert.equal(calls[0].name, 'not_in_schema');
 });