diff --git a/packages/base/command.gts b/packages/base/command.gts
index d79224ba87..b8bfb6b07e 100644
--- a/packages/base/command.gts
+++ b/packages/base/command.gts
@@ -60,8 +60,8 @@ export class CopyCardResult extends CardDef {
 }
 
 export class CopySourceInput extends CardDef {
-  @field fromRealmUrl = contains(StringField);
-  @field toRealmUrl = contains(StringField);
+  @field originSourceUrl = contains(StringField);
+  @field destinationSourceUrl = contains(StringField);
 }
 
 export class CopySourceResult extends CardDef {
diff --git a/packages/host/app/commands/copy-source.ts b/packages/host/app/commands/copy-source.ts
index f36e934b02..0ccb4156df 100644
--- a/packages/host/app/commands/copy-source.ts
+++ b/packages/host/app/commands/copy-source.ts
@@ -20,14 +20,17 @@ export default class CopySourceCommand extends HostBaseCommand<
     return CopySourceInput;
   }
 
-  requireInputFields = ['fromRealmUrl', 'toRealmUrl'];
+  requireInputFields = ['originSourceUrl', 'destinationSourceUrl'];
 
   protected async run(
     input: BaseCommandModule.CopySourceInput,
   ): Promise<BaseCommandModule.CopySourceResult> {
-    const fromRealmUrl = new URL(input.fromRealmUrl);
-    const toRealmUrl = new URL(input.toRealmUrl);
-    let r = await this.cardService.copySource(fromRealmUrl, toRealmUrl);
+    const originSourceUrl = new URL(input.originSourceUrl);
+    const destinationSourceUrl = new URL(input.destinationSourceUrl);
+    let r = await this.cardService.copySource(
+      originSourceUrl,
+      destinationSourceUrl,
+    );
     let commandModule = await this.loadCommandModule();
     const { CopySourceResult } = commandModule;
     if (r.ok && r.url) {
diff --git a/packages/host/tests/integration/commands/copy-source-test.gts b/packages/host/tests/integration/commands/copy-source-test.gts
index 0ab7f698bb..a765b62e8c 100644
--- a/packages/host/tests/integration/commands/copy-source-test.gts
+++ b/packages/host/tests/integration/commands/copy-source-test.gts
@@ -62,15 +62,15 @@ module('Integration | commands | copy-source', function (hooks) {
     let copySourceCommand = new CopySourceCommand(
       commandService.commandContext,
     );
-    const fromRealmUrl = testRealmURL + 'person.gts';
-    const toRealmUrl = testRealmURL + 'person-copy.gts';
+    const originSourceUrl = testRealmURL + 'person.gts';
+    const destinationSourceUrl = testRealmURL + 'person-copy.gts';
     await copySourceCommand.execute({
-      fromRealmUrl,
-      toRealmUrl,
+      originSourceUrl,
+      destinationSourceUrl,
     });
-    let personResponse = await fetch(new URL(fromRealmUrl));
+    let personResponse = await fetch(new URL(originSourceUrl));
     let personContent = await personResponse.text();
-    let personCopyResponse = await fetch(new URL(toRealmUrl));
+    let personCopyResponse = await fetch(new URL(destinationSourceUrl));
     let personCopyContent = await personCopyResponse.text();
 
     assert.strictEqual(personCopyContent, personContent);