feat: always report compaction status

src/index.ts

@@ -31,11 +31,7 @@ function buildInstructions(
   prompt: string,
   completionMarker: string,
   memory: string,
-): string | undefined {
-  if (!prompt && !memory) {
-    return undefined;
-  }
-
+): string {
   const sections = [
     "## User Compaction Instructions",
     `These instructions take precedence over previous instructions if there is conflict. At the very end of the summary, echo exactly: **${completionMarker}**`,
@@ -115,17 +111,9 @@ export const CompactionPromptPlugin: Plugin = async (
       output,
     ): Promise<void> => {
       const memory = await readMemory(memoryPath, logError);
-      const instructions = buildInstructions(prompt, completionMarker, memory);
-
-      if (!instructions) {
-        if (mode === "replace") {
-          output.prompt = skippedCompactionMarker;
-        } else {
-          output.context.push(skippedCompactionMarker);
-        }
-
-        return;
-      }
+      const marker =
+        prompt || memory ? completionMarker : skippedCompactionMarker;
+      const instructions = buildInstructions(prompt, marker, memory);
 
       if (mode === "replace") {
         output.prompt = instructions;