feat: route Linear comment replies to parent comment author (AGE-166)

src/event-router.ts

@@ -384,10 +384,6 @@ function handleComment(
   const bodyData = event.data.bodyData;
   const mentionedIds = extractMentionedUserIds(body, bodyData, config.agentMapping);
 
-  if (mentionedIds.length === 0) {
-    return [];
-  }
-
   const actions: RouterAction[] = [];
 
   const issueRef = event.data.issue as Record<string, unknown> | undefined;
@@ -420,6 +416,35 @@ function handleComment(
     }
   }
 
+  // Handle replies: route to parent comment's author
+  const parentComment = event.data.parentComment as Record<string, unknown> | undefined;
+  if (parentComment) {
+    const parentUserId = parentComment.userId as string | undefined;
+    if (parentUserId) {
+      const agentId = config.agentMapping[parentUserId];
+      // Skip if parent author was already notified via mention
+      const alreadyNotified = mentionedIds.includes(parentUserId);
+      if (agentId && !alreadyNotified) {
+        actions.push({
+          type: "wake",
+          agentId,
+          event: "comment.reply",
+          detail: `Reply to comment on issue ${issueLabel}\n\n> ${body}`,
+          issueId,
+          issueLabel,
+          identifier,
+          issuePriority,
+          linearUserId: parentUserId,
+          commentId,
+        });
+      } else if (!agentId) {
+        config.logger.info(
+          `Unmapped Linear user ${parentUserId} is parent comment author on ${issueId}`,
+        );
+      }
+    }
+  }
+
   return actions;
 }
 

src/index.ts

@@ -23,6 +23,7 @@ const EVENT_LABELS: Record<string, string> = {
   "issue.state_readded": "State Re-added",
   "issue.priority_changed": "Priority Changed",
   "comment.mention": "Mentioned",
+  "comment.reply": "Reply",
 };
 
 export function formatConsolidatedMessage(actions: RouterAction[]): string {
@@ -40,7 +41,7 @@ export function formatConsolidatedMessage(actions: RouterAction[]): string {
 }
 
 function formatActionSummary(action: RouterAction): string {
-  if (action.event === "comment.mention") {
+  if (action.event === "comment.mention" || action.event === "comment.reply") {
     const bodyStart = action.detail.indexOf("\n\n> ");
     if (bodyStart !== -1) {
       const quote = action.detail.slice(bodyStart + 4); // skip "\n\n> "

src/work-queue.ts

@@ -27,6 +27,7 @@ export const QUEUE_EVENT: Record<string, string> = {
   "issue.assigned": "ticket",
   "issue.state_readded": "ticket",
   "comment.mention": "mention",
+  "comment.reply": "mention",
 };
 
 const REMOVAL_EVENTS = new Set([