diff --git a/server/internal/handler/comment.go b/server/internal/handler/comment.go
index 83929845..a21bb61c 100644
--- a/server/internal/handler/comment.go
+++ b/server/internal/handler/comment.go
@@ -239,12 +239,9 @@ func (h *Handler) isReplyToMemberThread(parent *db.Comment, content string, issu
 // enqueues a task for each mentioned agent. Skips self-mentions, agents that
 // are already the issue's assignee (handled by on_comment), and agents with
 // on_mention trigger disabled.
+// Note: no status gate here — @mention is an explicit action and should work
+// even on done/cancelled issues (the agent can reopen the issue if needed).
 func (h *Handler) enqueueMentionedAgentTasks(ctx context.Context, issue db.Issue, comment db.Comment, authorType, authorID string) {
-	// Don't trigger on terminal statuses.
-	if issue.Status == "done" || issue.Status == "cancelled" {
-		return
-	}
-
 	mentions := util.ParseMentions(comment.Content)
 	for _, m := range mentions {
 		if m.Type != "agent" {
diff --git a/server/internal/handler/issue.go b/server/internal/handler/issue.go
index cd38e338..71da2edd 100644
--- a/server/internal/handler/issue.go
+++ b/server/internal/handler/issue.go
@@ -471,20 +471,16 @@ func (h *Handler) canAssignAgent(ctx context.Context, r *http.Request, agentID,
 }
 
 // shouldEnqueueAgentTask returns true when an issue assignment should trigger
-// the assigned agent. Only fires for "todo" status — assignment means "start
-// fresh work", so the agent shouldn't be triggered on issues already in
-// progress, blocked, or done.
+// the assigned agent. No status gate — assignment is an explicit human action,
+// so it should trigger regardless of issue status (e.g. assigning an agent to
+// a done issue to fix a discovered problem).
 func (h *Handler) shouldEnqueueAgentTask(ctx context.Context, issue db.Issue) bool {
-	if issue.Status != "todo" {
-		return false
-	}
 	return h.isAgentTriggerEnabled(ctx, issue, "on_assign")
 }
 
 // shouldEnqueueOnComment returns true if a member comment on this issue should
-// trigger the assigned agent. Unlike on_assign (todo only), on_comment fires
-// for any non-terminal status — comments are conversational and can happen at
-// any stage of active work (todo, in_progress, in_review, blocked).
+// trigger the assigned agent. Fires for any non-terminal status — comments are
+// conversational and can happen at any stage of active work.
 func (h *Handler) shouldEnqueueOnComment(ctx context.Context, issue db.Issue) bool {
 	// Don't trigger on terminal statuses (done, cancelled).
 	if issue.Status == "done" || issue.Status == "cancelled" {