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;

packages/core/src/tools/tools.ts

@@ -532,6 +532,14 @@ export enum Kind {
   Other = 'other',
 }
 
+// Function kinds that have side effects
+export const MUTATOR_KINDS: Kind[] = [
+  Kind.Edit,
+  Kind.Delete,
+  Kind.Move,
+  Kind.Execute,
+] as const;
+
 export interface ToolLocation {
   // Absolute path to the file
   path: string;