From a5f59ea6a5ad606659b20ae35e105a6c96b28d2a Mon Sep 17 00:00:00 2001
From: Acbox <acbox0328@gmail.com>
Date: Sat, 4 Apr 2026 17:17:35 +0800
Subject: [PATCH] fix(channel): strip agent tags from content parts in outbound
 messages

StripAgentTags was only applied to the merged content string but not to
individual ContentParts. On channels that don't support RichText (e.g.
Telegram), buildChannelMessage joins part texts directly, causing raw
<attachments>/<reactions>/<speech> blocks to appear in the final message.
---
 internal/conversation/flow/assistant_output.go | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/internal/conversation/flow/assistant_output.go b/internal/conversation/flow/assistant_output.go
index 942ef675..b0327e2d 100644
--- a/internal/conversation/flow/assistant_output.go
+++ b/internal/conversation/flow/assistant_output.go
@@ -30,6 +30,7 @@ func ExtractAssistantOutputs(messages []conversation.ModelMessage) []conversatio
 			continue
 		}
 		content = agent.StripAgentTags(content)
+		parts = stripAgentTagsFromParts(parts)
 		outputs = append(outputs, conversation.AssistantOutput{Content: content, Parts: parts})
 	}
 	return outputs
@@ -87,6 +88,22 @@ func visibleContentText(parts []conversation.ContentPart) string {
 	return strings.TrimSpace(strings.Join(texts, "\n"))
 }
 
+func stripAgentTagsFromParts(parts []conversation.ContentPart) []conversation.ContentPart {
+	if len(parts) == 0 {
+		return nil
+	}
+	result := make([]conversation.ContentPart, 0, len(parts))
+	for _, p := range parts {
+		if strings.TrimSpace(p.Text) != "" {
+			p.Text = agent.StripAgentTags(p.Text)
+		}
+		if p.HasValue() {
+			result = append(result, p)
+		}
+	}
+	return result
+}
+
 func visibleContentPartText(part conversation.ContentPart) string {
 	if strings.TrimSpace(part.Text) != "" {
 		return part.Text