Serialize function calls that mutate state (#8513)

packages/core/src/tools/tool-registry.ts

@@ -167,6 +167,7 @@ Signal: Signal number or \`(none)\` if no signal was received.
 }
 
 export class ToolRegistry {
+  // The tools keyed by tool name as seen by the LLM.
   private tools: Map<string, AnyDeclarativeTool> = new Map();
   private config: Config;
   private mcpClientManager: McpClientManager;