fix(continuation): mark resumes synthetic

src/shared/internal-initiator-marker.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, test } from "bun:test"
 import {
   OMO_INTERNAL_INITIATOR_MARKER,
+  createInternalAgentContinuationTextPart,
   createInternalAgentTextPart,
   stripInternalInitiatorMarkers,
 } from "./internal-initiator-marker"
@@ -19,6 +20,18 @@ describe("internal-initiator-marker", () => {
       expect(part.text).toBe(`Hello world\n${OMO_INTERNAL_INITIATOR_MARKER}`)
     })
 
+    test("#given regular internal text #when creating a text part #then leaves it visible as a normal message part", () => {
+      // given
+      const text = "Visible notification"
+
+      // when
+      const part = createInternalAgentTextPart(text)
+
+      // then
+      expect("synthetic" in part).toBe(false)
+      expect("metadata" in part).toBe(false)
+    })
+
     test("#given text already ending with the marker #when creating a text part #then does not duplicate the marker", () => {
       // given
       const text = `Already marked\n${OMO_INTERNAL_INITIATOR_MARKER}`
@@ -71,6 +84,22 @@ describe("internal-initiator-marker", () => {
     })
   })
 
+  describe("createInternalAgentContinuationTextPart", () => {
+    test("#given continuation text #when creating a text part #then marks it as an agent continuation", () => {
+      // given
+      const text = "Continue the loop"
+
+      // when
+      const part = createInternalAgentContinuationTextPart(text)
+
+      // then
+      expect(part.type).toBe("text")
+      expect(part.text).toBe(`Continue the loop\n${OMO_INTERNAL_INITIATOR_MARKER}`)
+      expect(part.synthetic).toBe(true)
+      expect(part.metadata.compaction_continue).toBe(true)
+    })
+  })
+
   describe("stripInternalInitiatorMarkers", () => {
     test("#given text with no markers #when stripping #then returns text trimmed at the end", () => {
       // given

src/shared/internal-initiator-marker.ts

@@ -16,3 +16,16 @@ export function createInternalAgentTextPart(text: string): {
     text: `${cleanText}\n${OMO_INTERNAL_INITIATOR_MARKER}`,
   }
 }
+
+export function createInternalAgentContinuationTextPart(text: string): {
+  type: "text"
+  text: string
+  synthetic: true
+  metadata: { compaction_continue: true }
+} {
+  return {
+    ...createInternalAgentTextPart(text),
+    synthetic: true,
+    metadata: { compaction_continue: true },
+  }
+}