diff --git a/docs/agent_loop_sequence_diagram.md b/docs/agent_loop_sequence_diagram.md
index 3feca84..c6c35b2 100644
--- a/docs/agent_loop_sequence_diagram.md
+++ b/docs/agent_loop_sequence_diagram.md
@@ -77,7 +77,7 @@ sequenceDiagram
             alt Tool calls exist
                 Note over AgentLoop: 4. Execute Tools
                 
-                alt SEQUENTIAL or has_sequential_tool_call
+                alt Sequential execution
                     AgentLoop->>AgentLoop: executeToolCallsSequential(...)
                     activate AgentLoop
                     
@@ -88,9 +88,9 @@ sequenceDiagram
                             AgentLoop->>AgentLoop: createErrorToolResult
                             AgentLoop->>AgentLoop: emit(ToolExecutionEndEvent)
                         else Tool found
-                            alt before_tool_call hook exists
+                            alt before_tool_call hook
                                 AgentLoop->>AgentLoop: before_tool_call(context, signal)
-                                alt Hook blocks execution
+                                alt Hook blocks
                                     AgentLoop->>AgentLoop: createErrorToolResult
                                     AgentLoop->>AgentLoop: emit(ToolExecutionEndEvent)
                                 else Execution allowed
@@ -147,7 +147,9 @@ sequenceDiagram
                     AgentLoop->>AgentLoop: return ExecutedToolCallBatch
                     deactivate AgentLoop
                     activate AgentLoop
-                else PARALLEL
+                end
+                
+                alt Parallel execution
                     AgentLoop->>AgentLoop: executeToolCallsParallel(...)
                     activate AgentLoop