fix(cli): honor positive tool preview length

tests/agent/test_display.py

@@ -8,12 +8,21 @@ from agent.display import (
     build_tool_preview,
     capture_local_edit_snapshot,
     extract_edit_diff,
+    get_cute_tool_message,
+    set_tool_preview_max_len,
     _render_inline_unified_diff,
     _summarize_rendered_diff_sections,
     render_edit_diff_with_delta,
 )
 
 
+@pytest.fixture(autouse=True)
+def reset_tool_preview_max_len():
+    set_tool_preview_max_len(0)
+    yield
+    set_tool_preview_max_len(0)
+
+
 class TestBuildToolPreview:
     """Tests for build_tool_preview defensive handling and normal operation."""
 
@@ -102,6 +111,45 @@ class TestBuildToolPreview:
         assert build_tool_preview("terminal", []) is None
 
 
+class TestCuteToolMessagePreviewLength:
+    def test_terminal_preview_unlimited_when_config_is_zero(self):
+        set_tool_preview_max_len(0)
+        command = "curl -s http://localhost:9222/json/list | jq -r '.[] | select(.type==\"page\")' | head -5"
+
+        line = get_cute_tool_message("terminal", {"command": command}, 0.1)
+
+        assert command in line
+        assert "..." not in line
+
+    def test_terminal_preview_uses_positive_configured_limit(self):
+        set_tool_preview_max_len(80)
+        command = "curl -s http://localhost:9222/json/list | jq -r '.[] | select(.type==\"page\")' | head -5"
+
+        line = get_cute_tool_message("terminal", {"command": command}, 0.1)
+
+        assert command[:77] in line
+        assert "..." in line
+        assert "head -5" not in line
+
+    def test_search_files_preview_uses_positive_configured_limit_not_default(self):
+        set_tool_preview_max_len(80)
+        pattern = "function.formatToolCall.context.preview.compactPreview.maxLength.truncate"
+
+        line = get_cute_tool_message("search_files", {"pattern": pattern}, 0.1)
+
+        assert pattern in line
+        assert "..." not in line
+
+    def test_path_preview_uses_positive_configured_limit_not_default(self):
+        set_tool_preview_max_len(80)
+        path = "/tmp/hermes-test-preview-length/deeply/nested/path/test-output.txt"
+
+        line = get_cute_tool_message("read_file", {"path": path}, 0.1)
+
+        assert path in line
+        assert "..." not in line
+
+
 class TestEditDiffPreview:
     def test_extract_edit_diff_for_patch(self):
         diff = extract_edit_diff("patch", '{"success": true, "diff": "--- a/x\\n+++ b/x\\n"}')