diff --git a/plugins/platforms/slack/adapter.py b/plugins/platforms/slack/adapter.py
index 56ea96491a..46ae570309 100644
--- a/plugins/platforms/slack/adapter.py
+++ b/plugins/platforms/slack/adapter.py
@@ -2870,6 +2870,11 @@ class SlackAdapter(BasePlatformAdapter):
             logger.debug("[Slack] block render failed; using plain text", exc_info=True)
             return None
 
+    def format_tool_preview(self, preview) -> str:
+        """Keep compact tool arguments out of mrkdwn emphasis conversion."""
+        # Substitute embedded delimiters in the display text only.
+        return f"`{preview.text.replace('`', 'ˋ')}`"
+
     def format_message(self, content: str) -> str:
         """Convert standard markdown to Slack mrkdwn.
         Tables are fenced first; code is protected from later passes; broadcast mentions are escaped
diff --git a/tests/gateway/test_slack.py b/tests/gateway/test_slack.py
index 885213726f..76f9515e17 100644
--- a/tests/gateway/test_slack.py
+++ b/tests/gateway/test_slack.py
@@ -2593,6 +2593,35 @@ class TestSendTyping:
 class TestFormatMessage:
     """Test markdown to Slack mrkdwn conversion."""
 
+    @pytest.mark.asyncio
+    @pytest.mark.parametrize("target,pattern", [
+        ("files", "*test*.py"),
+        ("content", r"test_.*_.*\.py"),
+    ])
+    async def test_tool_progress_preserves_search_pattern(self, adapter, target, pattern):
+        from gateway.run_turn_runner import TurnRunner
+
+        args = {"target": target, "pattern": pattern}
+        ctx = SimpleNamespace(source=None, progress_mode="all", last_was_terminal_block=[False])
+        runner = SimpleNamespace(_adapter_for_source=lambda source: adapter)
+        message = TurnRunner(runner, ctx)._progress_build_message("search_files", pattern, args)
+        client = adapter._app.client
+        client.chat_postMessage.return_value = {"ok": True, "ts": "123.456"}
+        client.chat_update.return_value = {"ok": True, "ts": "123.456"}
+
+        assert (await adapter.send("C123", message)).success
+        assert (await adapter.edit_message("C123", "123.456", message)).success
+        for method in (client.chat_postMessage, client.chat_update):
+            assert method.call_args.kwargs["text"].endswith(f"`{pattern}`")
+        assert args == {"target": target, "pattern": pattern}
+
+    def test_tool_preview_backticks_do_not_break_code_span(self, adapter):
+        from agent.display import ToolPreview
+
+        preview = ToolPreview(text="`*test*`.py")
+        rendered = adapter.format_message(adapter.format_tool_preview(preview))
+        assert rendered == "`ˋ*test*ˋ.py`"
+        assert preview.text == "`*test*`.py"
 
     def test_italic_asterisk_conversion(self, adapter):
         assert adapter.format_message("*hello*") == "_hello_"