diff --git a/pkg/bus/types.go b/pkg/bus/types.go
index c648fb0ce..15aebc345 100644
--- a/pkg/bus/types.go
+++ b/pkg/bus/types.go
@@ -30,10 +30,11 @@ type InboundMessage struct {
 }
 
 type OutboundMessage struct {
-	Channel          string `json:"channel"`
-	ChatID           string `json:"chat_id"`
-	Content          string `json:"content"`
-	ReplyToMessageID string `json:"reply_to_message_id,omitempty"`
+	Channel          string            `json:"channel"`
+	ChatID           string            `json:"chat_id"`
+	Content          string            `json:"content"`
+	ReplyToMessageID string            `json:"reply_to_message_id,omitempty"`
+	Metadata         map[string]string `json:"metadata,omitempty"`
 }
 
 // MediaPart describes a single media attachment to send.
diff --git a/pkg/channels/discord/discord.go b/pkg/channels/discord/discord.go
index d059379aa..38d365678 100644
--- a/pkg/channels/discord/discord.go
+++ b/pkg/channels/discord/discord.go
@@ -154,7 +154,14 @@ func (c *DiscordChannel) Send(ctx context.Context, msg bus.OutboundMessage) erro
 		return nil
 	}
 
-	if c.tts != nil {
+	isToolCall := false
+	if msg.Metadata != nil {
+		if val, ok := msg.Metadata["is_tool_call"]; ok && val == "true" {
+			isToolCall = true
+		}
+	}
+
+	if c.tts != nil && !isToolCall {
 		if ch, err := c.session.State.Channel(channelID); err == nil && ch.GuildID != "" {
 			if vc, ok := c.session.VoiceConnections[ch.GuildID]; ok && vc != nil {
 				// Cancel any previous TTS playback