diff --git a/tests/tools/test_tts_speed.py b/tests/tools/test_tts_speed.py
new file mode 100644
index 0000000000..7622a7f622
--- /dev/null
+++ b/tests/tools/test_tts_speed.py
@@ -0,0 +1,145 @@
+"""Tests for TTS speed configuration across providers."""
+
+import asyncio
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def clean_env(monkeypatch):
+    for key in ("OPENAI_API_KEY", "MINIMAX_API_KEY", "HERMES_SESSION_PLATFORM"):
+        monkeypatch.delenv(key, raising=False)
+
+
+# ---------------------------------------------------------------------------
+# Edge TTS speed
+# ---------------------------------------------------------------------------
+
+class TestEdgeTtsSpeed:
+    def _run(self, tts_config, tmp_path):
+        mock_comm = MagicMock()
+        mock_comm.save = AsyncMock()
+        mock_edge = MagicMock()
+        mock_edge.Communicate = MagicMock(return_value=mock_comm)
+
+        with patch("tools.tts_tool._import_edge_tts", return_value=mock_edge):
+            from tools.tts_tool import _generate_edge_tts
+            asyncio.run(_generate_edge_tts("Hello", str(tmp_path / "out.mp3"), tts_config))
+        return mock_edge.Communicate
+
+    def test_default_no_rate_kwarg(self, tmp_path):
+        """No speed config => no rate kwarg passed to Communicate."""
+        comm_cls = self._run({}, tmp_path)
+        kwargs = comm_cls.call_args[1]
+        assert "rate" not in kwargs
+
+    def test_global_speed_applied(self, tmp_path):
+        """Global tts.speed used as fallback."""
+        comm_cls = self._run({"speed": 1.5}, tmp_path)
+        kwargs = comm_cls.call_args[1]
+        assert kwargs["rate"] == "+50%"
+
+    def test_provider_speed_overrides_global(self, tmp_path):
+        """tts.edge.speed takes precedence over tts.speed."""
+        comm_cls = self._run({"speed": 1.5, "edge": {"speed": 2.0}}, tmp_path)
+        kwargs = comm_cls.call_args[1]
+        assert kwargs["rate"] == "+100%"
+
+    def test_speed_below_one(self, tmp_path):
+        """Speed < 1.0 produces a negative rate string."""
+        comm_cls = self._run({"speed": 0.5}, tmp_path)
+        kwargs = comm_cls.call_args[1]
+        assert kwargs["rate"] == "-50%"
+
+    def test_speed_exactly_one_no_rate(self, tmp_path):
+        """Explicit speed=1.0 should not pass rate kwarg."""
+        comm_cls = self._run({"speed": 1.0}, tmp_path)
+        kwargs = comm_cls.call_args[1]
+        assert "rate" not in kwargs
+
+
+# ---------------------------------------------------------------------------
+# OpenAI TTS speed
+# ---------------------------------------------------------------------------
+
+class TestOpenaiTtsSpeed:
+    def _run(self, tts_config, tmp_path, monkeypatch):
+        monkeypatch.setenv("OPENAI_API_KEY", "test-key")
+        mock_response = MagicMock()
+        mock_client = MagicMock()
+        mock_client.audio.speech.create.return_value = mock_response
+        mock_cls = MagicMock(return_value=mock_client)
+
+        with patch("tools.tts_tool._import_openai_client", return_value=mock_cls), \
+             patch("tools.tts_tool._resolve_openai_audio_client_config",
+                   return_value=("test-key", None)):
+            from tools.tts_tool import _generate_openai_tts
+            _generate_openai_tts("Hello", str(tmp_path / "out.mp3"), tts_config)
+        return mock_client.audio.speech.create
+
+    def test_default_no_speed_kwarg(self, tmp_path, monkeypatch):
+        """No speed config => no speed kwarg in create call."""
+        create = self._run({}, tmp_path, monkeypatch)
+        kwargs = create.call_args[1]
+        assert "speed" not in kwargs
+
+    def test_global_speed_applied(self, tmp_path, monkeypatch):
+        """Global tts.speed used as fallback."""
+        create = self._run({"speed": 1.5}, tmp_path, monkeypatch)
+        kwargs = create.call_args[1]
+        assert kwargs["speed"] == 1.5
+
+    def test_provider_speed_overrides_global(self, tmp_path, monkeypatch):
+        """tts.openai.speed takes precedence over tts.speed."""
+        create = self._run({"speed": 1.5, "openai": {"speed": 2.0}}, tmp_path, monkeypatch)
+        kwargs = create.call_args[1]
+        assert kwargs["speed"] == 2.0
+
+    def test_speed_clamped_low(self, tmp_path, monkeypatch):
+        """Speed below 0.25 is clamped to 0.25."""
+        create = self._run({"speed": 0.1}, tmp_path, monkeypatch)
+        kwargs = create.call_args[1]
+        assert kwargs["speed"] == 0.25
+
+    def test_speed_clamped_high(self, tmp_path, monkeypatch):
+        """Speed above 4.0 is clamped to 4.0."""
+        create = self._run({"speed": 10.0}, tmp_path, monkeypatch)
+        kwargs = create.call_args[1]
+        assert kwargs["speed"] == 4.0
+
+
+# ---------------------------------------------------------------------------
+# MiniMax TTS speed (global fallback wired)
+# ---------------------------------------------------------------------------
+
+class TestMinimaxTtsSpeed:
+    def _run(self, tts_config, tmp_path, monkeypatch):
+        monkeypatch.setenv("MINIMAX_API_KEY", "test-key")
+        mock_response = MagicMock()
+        mock_response.status_code = 200
+        mock_response.json.return_value = {
+            "data": {"audio": "deadbeef"},
+            "base_resp": {"status_code": 0, "status_msg": "success"},
+            "extra_info": {"audio_size": 8},
+        }
+
+        # requests is imported locally inside _generate_minimax_tts
+        with patch("requests.post", return_value=mock_response) as mock_post:
+            from tools.tts_tool import _generate_minimax_tts
+            _generate_minimax_tts("Hello", str(tmp_path / "out.mp3"), tts_config)
+        return mock_post
+
+    def test_global_speed_fallback(self, tmp_path, monkeypatch):
+        """Global tts.speed used when minimax.speed not set."""
+        mock_post = self._run({"speed": 1.5}, tmp_path, monkeypatch)
+        payload = mock_post.call_args[1]["json"]
+        assert payload["voice_setting"]["speed"] == 1.5
+
+    def test_provider_speed_overrides_global(self, tmp_path, monkeypatch):
+        """tts.minimax.speed takes precedence over tts.speed."""
+        mock_post = self._run(
+            {"speed": 1.5, "minimax": {"speed": 2.0}}, tmp_path, monkeypatch
+        )
+        payload = mock_post.call_args[1]["json"]
+        assert payload["voice_setting"]["speed"] == 2.0