refactor: Implement code review suggestions for emoji disable feature

- Move EMOJI_MAP to module level as DEFAULT_EMOJI_MAP for memory efficiency
- Add _parse_bool_env() helper function for cleaner boolean conversion
- Implement performance optimization with icon caching
- Improve error handling for unknown emojis with better fallback format
- Update tests to work with new module structure
- All functionality preserved and tests passing

Addresses feedback from PR review #3063

Co-Authored-By: João <joao@crewai.com>

src/crewai/utilities/events/utils/console_formatter.py

@@ -1,5 +1,5 @@
 import os
-from typing import Any, Dict, Optional
+from typing import Any, Dict, Optional, Union
 
 from rich.console import Console
 from rich.panel import Panel
@@ -8,32 +8,7 @@ from rich.tree import Tree
 from rich.live import Live
 from rich.syntax import Syntax
 
-
-class ConsoleFormatter:
-    current_crew_tree: Optional[Tree] = None
-    current_task_branch: Optional[Tree] = None
-    current_agent_branch: Optional[Tree] = None
-    current_tool_branch: Optional[Tree] = None
-    current_flow_tree: Optional[Tree] = None
-    current_method_branch: Optional[Tree] = None
-    current_lite_agent_branch: Optional[Tree] = None
-    tool_usage_counts: Dict[str, int] = {}
-    current_reasoning_branch: Optional[Tree] = None  # Track reasoning status
-    _live_paused: bool = False
-    current_llm_tool_tree: Optional[Tree] = None
-
-    def __init__(self, verbose: bool = False):
-        self.console = Console(width=None)
-        self.verbose = verbose
-        self.disable_emojis = os.getenv("CREWAI_DISABLE_EMOJIS", "").lower() in ("true", "1", "yes")
-        # Live instance to dynamically update a Tree renderable (e.g. the Crew tree)
-        # When multiple Tree objects are printed sequentially we reuse this Live
-        # instance so the previous render is replaced instead of writing a new one.
-        # Once any non-Tree renderable is printed we stop the Live session so the
-        # final Tree persists on the terminal.
-        self._live: Optional[Live] = None
-
-    EMOJI_MAP = {
+DEFAULT_EMOJI_MAP = {
     "✅": "[DONE]",
     "❌": "[FAILED]", 
     "🚀": "[CREW]",
@@ -59,11 +34,53 @@ class ConsoleFormatter:
     "💾": "[SAVE]",
     "🔒": "[SECURE]",
     "🌟": "[STAR]",
-    }
+}
+
+
+def _parse_bool_env(val: str) -> bool:
+    """Parse environment variable value to boolean."""
+    return val.lower() in ("true", "1", "yes") if val else False
+
+
+class ConsoleFormatter:
+    current_crew_tree: Optional[Tree] = None
+    current_task_branch: Optional[Tree] = None
+    current_agent_branch: Optional[Tree] = None
+    current_tool_branch: Optional[Tree] = None
+    current_flow_tree: Optional[Tree] = None
+    current_method_branch: Optional[Tree] = None
+    current_lite_agent_branch: Optional[Tree] = None
+    tool_usage_counts: Dict[str, int] = {}
+    current_reasoning_branch: Optional[Tree] = None  # Track reasoning status
+    _live_paused: bool = False
+    current_llm_tool_tree: Optional[Tree] = None
+
+    def __init__(self, verbose: bool = False):
+        self.console = Console(width=None)
+        self.verbose = verbose
+        self.disable_emojis = _parse_bool_env(os.getenv("CREWAI_DISABLE_EMOJIS", ""))
+        
+        self.emoji_map = DEFAULT_EMOJI_MAP.copy()
+        self.icon_cache: Dict[str, str] = {}
+        if self.disable_emojis:
+            self.icon_cache = {emoji: text for emoji, text in self.emoji_map.items()}
+        
+        # Live instance to dynamically update a Tree renderable (e.g. the Crew tree)
+        # When multiple Tree objects are printed sequentially we reuse this Live
+        # instance so the previous render is replaced instead of writing a new one.
+        # Once any non-Tree renderable is printed we stop the Live session so the
+        # final Tree persists on the terminal.
+        self._live: Optional[Live] = None
 
     def _get_icon(self, emoji: str) -> str:
+        """Get emoji or text alternative based on disable_emojis setting."""
         if self.disable_emojis:
-            return self.EMOJI_MAP.get(emoji, emoji.encode('ascii', 'ignore').decode('ascii'))
+            if emoji in self.icon_cache:
+                return self.icon_cache[emoji]
+            ascii_fallback = emoji.encode('ascii', 'ignore').decode('ascii')
+            fallback = f"[ICON:{ascii_fallback or 'UNKNOWN'}]"
+            self.icon_cache[emoji] = fallback
+            return fallback
         return emoji
 
     def create_panel(self, content: Text, title: str, style: str = "blue") -> Panel:

tests/utilities/events/utils/test_console_formatter_emoji_disable.py

@@ -96,11 +96,11 @@ class TestConsoleFormatterEmojiDisable:
                 assert formatter._get_icon(emoji) == expected_text
 
     def test_unknown_emoji_fallback(self):
-        """Test that unknown emojis fall back to ASCII-only representation."""
+        """Test that unknown emojis fall back to proper representation."""
         with patch.dict(os.environ, {"CREWAI_DISABLE_EMOJIS": "true"}):
             formatter = ConsoleFormatter(verbose=True)
             result = formatter._get_icon("🦄")
-            assert result == ""
+            assert result == "[ICON:UNKNOWN]"
 
     @patch.dict(os.environ, {"CREWAI_DISABLE_EMOJIS": "true"})
     def test_crew_tree_creation_without_emojis(self):