diff --git a/cmd/gateway_announce_queue.go b/cmd/gateway_announce_queue.go
index 561f067d13..6c21d7b8c6 100644
--- a/cmd/gateway_announce_queue.go
+++ b/cmd/gateway_announce_queue.go
@@ -37,13 +37,22 @@ func enqueueAnnounce(key string, entry announceEntry) bool {
 
 // announceRouting holds the shared routing info captured by the first goroutine.
 type announceRouting struct {
-	LeadAgent        string
-	LeadSessionKey   string
-	OrigChannel      string
-	OrigChatID       string
-	OrigPeerKind     string
-	OrigLocalKey     string
-	OriginUserID     string
+	LeadAgent      string
+	LeadSessionKey string
+	OrigChannel    string
+	OrigChatID     string
+	OrigPeerKind   string
+	OrigLocalKey   string
+	OriginUserID   string
+	// OriginSenderID and OriginRole carry the real acting human's identity
+	// from the original team-task dispatch. Without them, the Lead's session
+	// resumes from this re-ingress with an empty SenderID, which then fails
+	// CheckFileWriterPermission / CheckCronPermission in group contexts
+	// ("system context cannot write files in group chats"). The subagent
+	// announce queue (subagentAnnounceRouting) already carries these fields
+	// — this keeps the team-task announce queue at parity. (#915 follow-up)
+	OriginSenderID   string
+	OriginRole       string
 	TeamID           string
 	TeamWorkspace    string
 	OriginTraceID    string
@@ -83,13 +92,20 @@ func processAnnounceLoop(
 		content := buildMergedAnnounceContent(entries, snapshot, r.TeamWorkspace)
 
 		req := agent.RunRequest{
-			SessionKey:       r.LeadSessionKey,
-			Message:          content,
-			Channel:          r.OrigChannel,
-			ChatID:           r.OrigChatID,
-			PeerKind:         r.OrigPeerKind,
-			LocalKey:         r.OrigLocalKey,
-			UserID:           r.OriginUserID,
+			SessionKey: r.LeadSessionKey,
+			Message:    content,
+			Channel:    r.OrigChannel,
+			ChatID:     r.OrigChatID,
+			PeerKind:   r.OrigPeerKind,
+			LocalKey:   r.OrigLocalKey,
+			UserID:     r.OriginUserID,
+			// SenderID + Role propagate the original human acting through this
+			// team-task announce. loop_context.injectContext gates WithSenderID
+			// on req.SenderID being non-empty, so missing them silently strips
+			// the Lead's identity on resume — and group-scoped permission
+			// checks then deny write_file etc. (#915 follow-up)
+			SenderID:         r.OriginSenderID,
+			Role:             r.OriginRole,
 			RunID:            fmt.Sprintf("teammate-announce-%s-%d", r.LeadAgent, len(entries)),
 			RunKind:          "announce",
 			HideInput:        true,
diff --git a/cmd/gateway_announce_routing_test.go b/cmd/gateway_announce_routing_test.go
new file mode 100644
index 0000000000..681ce47b1f
--- /dev/null
+++ b/cmd/gateway_announce_routing_test.go
@@ -0,0 +1,74 @@
+package cmd
+
+import (
+	"testing"
+
+	"github.com/nextlevelbuilder/goclaw/internal/tools"
+)
+
+// TestAnnounceRouting_PropagatesSenderAndRole guards against the regression
+// where team-task completion announces drop SenderID/Role on re-ingress to
+// the Lead session — the failure mode reported as
+// `permission denied: system context cannot write files in group chats`
+// when the Lead tries write_file inside the announce-triggered turn.
+//
+// team_tool_dispatch.go already stores MetaOriginSenderID + MetaOriginRole
+// at dispatch time. The bug: announceRouting + the RunRequest it builds
+// must read these back from inMeta on completion, otherwise loop_context
+// skips WithSenderID and the Lead's resume has empty sender attribution.
+func TestAnnounceRouting_PropagatesSenderAndRole(t *testing.T) {
+	const (
+		realSender = "5218954741"   // Telegram numeric user id
+		realRole   = "admin"
+		realUserID = "group:telegram:-1003812294018"
+	)
+
+	// Simulate what consumer_handlers.go reads from a teammate-message inMeta.
+	inMeta := map[string]string{
+		tools.MetaOriginSenderID: realSender,
+		tools.MetaOriginRole:     realRole,
+		tools.MetaOriginUserID:   realUserID,
+		tools.MetaTeamID:         "019d8a59-6e40-730f-89b2-8a41b7e1fad2",
+	}
+
+	r := announceRouting{
+		OriginUserID:   inMeta[tools.MetaOriginUserID],
+		OriginSenderID: inMeta[tools.MetaOriginSenderID],
+		OriginRole:     inMeta[tools.MetaOriginRole],
+		TeamID:         inMeta[tools.MetaTeamID],
+	}
+
+	if r.OriginSenderID != realSender {
+		t.Fatalf("OriginSenderID = %q, want %q (team-task announce dropped sender attribution)",
+			r.OriginSenderID, realSender)
+	}
+	if r.OriginRole != realRole {
+		t.Fatalf("OriginRole = %q, want %q (team-task announce dropped RBAC role)",
+			r.OriginRole, realRole)
+	}
+	if r.OriginUserID != realUserID {
+		t.Fatalf("OriginUserID = %q, want %q", r.OriginUserID, realUserID)
+	}
+}
+
+// TestAnnounceRouting_EmptyMetaPropagatesEmpty asserts the wire-through is
+// faithful when upstream legitimately has no sender (e.g. a system-initiated
+// dispatch). We must NOT fabricate a synthetic sender just because the field
+// is empty — that would defeat the deny-on-empty guard in
+// CheckFileWriterPermission.
+func TestAnnounceRouting_EmptyMetaPropagatesEmpty(t *testing.T) {
+	inMeta := map[string]string{
+		tools.MetaTeamID: "team-uuid",
+	}
+	r := announceRouting{
+		OriginUserID:   inMeta[tools.MetaOriginUserID],
+		OriginSenderID: inMeta[tools.MetaOriginSenderID],
+		OriginRole:     inMeta[tools.MetaOriginRole],
+	}
+	if r.OriginSenderID != "" {
+		t.Errorf("OriginSenderID = %q, want empty (no upstream sender to propagate)", r.OriginSenderID)
+	}
+	if r.OriginRole != "" {
+		t.Errorf("OriginRole = %q, want empty", r.OriginRole)
+	}
+}
diff --git a/cmd/gateway_consumer_handlers.go b/cmd/gateway_consumer_handlers.go
index 66216cfeea..36baef0b4a 100644
--- a/cmd/gateway_consumer_handlers.go
+++ b/cmd/gateway_consumer_handlers.go
@@ -363,13 +363,19 @@ func handleTeammateMessage(
 		}
 
 		routing := announceRouting{
-			LeadAgent:        leadAgent,
-			LeadSessionKey:   leadSessionKey,
-			OrigChannel:      origCh,
-			OrigChatID:       origChatID,
-			OrigPeerKind:     origPeerKind,
-			OrigLocalKey:     origLocalKey,
-			OriginUserID:     inMeta[tools.MetaOriginUserID],
+			LeadAgent:      leadAgent,
+			LeadSessionKey: leadSessionKey,
+			OrigChannel:    origCh,
+			OrigChatID:     origChatID,
+			OrigPeerKind:   origPeerKind,
+			OrigLocalKey:   origLocalKey,
+			OriginUserID:   inMeta[tools.MetaOriginUserID],
+			// Carry the real acting sender + role through the team-task
+			// announce so the Lead's resumed turn doesn't lose attribution
+			// and trip group-scope permission checks. team_tool_dispatch.go
+			// already populates these fields in the dispatch metadata. (#915)
+			OriginSenderID:   inMeta[tools.MetaOriginSenderID],
+			OriginRole:       inMeta[tools.MetaOriginRole],
 			TeamID:           inMeta[tools.MetaTeamID],
 			TeamWorkspace:    inMeta[tools.MetaTeamWorkspace],
 			OriginTraceID:    inMeta[tools.MetaOriginTraceID],