diff --git a/src/features/context-injector/injector.test.ts b/src/features/context-injector/injector.test.ts
index f4734685d..d08f4bbb4 100644
--- a/src/features/context-injector/injector.test.ts
+++ b/src/features/context-injector/injector.test.ts
@@ -111,6 +111,8 @@ describe("createContextInjectorMessagesTransformHook", () => {
     expect(
       "synthetic" in secondSyntheticPart && secondSyntheticPart.synthetic === true
     ).toBe(true)
+    expect(typeof secondSyntheticPart.id).toBe("string")
+    expect(secondSyntheticPart.id.startsWith("prt_")).toBe(true)
     expect(secondSyntheticPart.id).toBe(firstSyntheticPart.id)
   })
 
diff --git a/src/features/context-injector/injector.ts b/src/features/context-injector/injector.ts
index 2b170b1f8..df6d27e9b 100644
--- a/src/features/context-injector/injector.ts
+++ b/src/features/context-injector/injector.ts
@@ -164,7 +164,7 @@ export function createContextInjectorMessagesTransformHook(
       }
 
       const syntheticPart = {
-        id: `synthetic_hook_${sessionID}`,
+        id: `prt_synthetic_hook_${sessionID}`,
         messageID: lastUserMessage.info.id,
         sessionID: messageSessionID ?? "",
         type: "text" as const,