fix: honor slack reply threading

src/auto-reply/reply/agent-runner.ts

@@ -260,7 +260,9 @@ export async function runReplyAgent(params: {
     followupRun.run.config,
     replyToChannel,
   );
-  const applyReplyToMode = createReplyToModeFilter(replyToMode);
+  const applyReplyToMode = createReplyToModeFilter(replyToMode, {
+    allowTagsWhenOff: replyToChannel === "slack",
+  });
   const cfg = followupRun.run.config;
 
   if (shouldSteer && isStreaming) {

src/auto-reply/reply/reply-payloads.ts

@@ -10,7 +10,7 @@ export function applyReplyTagsToPayload(
   currentMessageId?: string,
 ): ReplyPayload {
   if (typeof payload.text !== "string") return payload;
-  const { cleaned, replyToId } = extractReplyToTag(
+  const { cleaned, replyToId, hasTag } = extractReplyToTag(
     payload.text,
     currentMessageId,
   );
@@ -18,6 +18,7 @@ export function applyReplyTagsToPayload(
     ...payload,
     text: cleaned ? cleaned : undefined,
     replyToId: replyToId ?? payload.replyToId,
+    replyToTag: hasTag || payload.replyToTag,
   };
 }
 

src/auto-reply/reply/reply-threading.test.ts

@@ -40,6 +40,13 @@ describe("createReplyToModeFilter", () => {
     expect(filter({ text: "hi", replyToId: "1" }).replyToId).toBeUndefined();
   });
 
+  it("keeps replyToId when mode is off and reply tags are allowed", () => {
+    const filter = createReplyToModeFilter("off", { allowTagsWhenOff: true });
+    expect(
+      filter({ text: "hi", replyToId: "1", replyToTag: true }).replyToId,
+    ).toBe("1");
+  });
+
   it("keeps replyToId when mode is all", () => {
     const filter = createReplyToModeFilter("all");
     expect(filter({ text: "hi", replyToId: "1" }).replyToId).toBe("1");

src/auto-reply/reply/reply-threading.ts

@@ -19,11 +19,15 @@ export function resolveReplyToMode(
   }
 }
 
-export function createReplyToModeFilter(mode: ReplyToMode) {
+export function createReplyToModeFilter(
+  mode: ReplyToMode,
+  opts: { allowTagsWhenOff?: boolean } = {},
+) {
   let hasThreaded = false;
   return (payload: ReplyPayload): ReplyPayload => {
     if (!payload.replyToId) return payload;
     if (mode === "off") {
+      if (opts.allowTagsWhenOff && payload.replyToTag) return payload;
       return { ...payload, replyToId: undefined };
     }
     if (mode === "all") return payload;