feat(copilot): enhance message formatting by removing copilot footer and trimming empty lines

Author: 35C4n0r

lib/msgfmt/format_tool_call.go

@@ -184,7 +184,7 @@ func removeCopilotReportTaskToolCall(msg string) (string, []string) {
 
 		lines = append(lines[:start], lines[end:]...)
 	}
-	return strings.TrimLeft(strings.Join(lines, "\n"), "\n"), toolCallMessages
+	return strings.Trim(strings.Join(lines, "\n"), "\n"), toolCallMessages
 }
 
 func FormatToolCall(agentType AgentType, message string) (string, []string) {

lib/msgfmt/message_box.go

@@ -113,3 +113,19 @@ func removeAmpMessageBox(msg string) string {
 	}
 	return formattedMsg
 }
+
+func removeCopilotFooter(msg string) string {
+	lines := strings.Split(msg, "\n")
+
+	firstEmptyLine := 0
+
+	// From the end strip until we discover an empty line
+	for i := len(lines) - 1; i >= 0; i-- {
+		if len(strings.TrimSpace(lines[i])) == 0 {
+			firstEmptyLine = i
+			break
+		}
+	}
+
+	return strings.Join(lines[:firstEmptyLine], "\n")
+}

lib/msgfmt/msgfmt.go

@@ -254,6 +254,14 @@ func formatGenericMessage(message string, userInput string, agentType AgentType)
 	return message
 }
 
+func formatCopilotMessage(message string, userInput string) string {
+	message = RemoveUserInput(message, userInput, AgentTypeCopilot)
+	message = removeMessageBox(message)
+	message = removeCopilotFooter(message)
+	message = trimEmptyLines(message)
+	return message
+}
+
 func formatCodexMessage(message string, userInput string) string {
 	message = RemoveUserInput(message, userInput, AgentTypeCodex)
 	message = removeCodexMessageBox(message)
@@ -288,7 +296,7 @@ func FormatAgentMessage(agentType AgentType, message string, userInput string) s
 	case AgentTypeGemini:
 		return formatGenericMessage(message, userInput, agentType)
 	case AgentTypeCopilot:
-		return formatGenericMessage(message, userInput, agentType)
+		return formatCopilotMessage(message, userInput)
 	case AgentTypeAmp:
 		return formatAmpMessage(message, userInput)
 	case AgentTypeCursor:

lib/msgfmt/testdata/format/copilot/first_message/expected.txt

@@ -6,6 +6,4 @@
 
  ● Logged in with gh as user: 35C4n0r
 
- ● Connected to GitHub MCP Server
-
- ~/Documents/work/.../agentapi [⎇ main*]     claude-haiku-4.5 (1x)
+ ● Connected to GitHub MCP Server

lib/msgfmt/testdata/format/copilot/multi-line-input/expected.txt

@@ -104,6 +104,4 @@
    uses Server-Sent Events (SSE) for real-time communication instead of polling, as
    seen in the chat/src/components/chat-provider.tsx file where an EventSource
    connection is established to listen for message updates and status changes from
-   the server.
-
- ~/Documents/work/agentapi [⎇ feat-github-cli*]
+   the server.

lib/msgfmt/testdata/format/copilot/remove-task-tool-call/expected.txt

@@ -107,6 +107,4 @@
    - ✓ Game initializes and runs successfully                      
    - ✓ Pygame installed and configured                             
 
-  Ready to play! 🐍                                                 
-
- ~/projects                                  claude-haiku-4.5 (1x) 
+  Ready to play! 🐍                                                 

lib/msgfmt/testdata/format/copilot/remove-task-tool-call/expected_tool_calls.txt

@@ -1,6 +1,5 @@
 ● coder_report_task: Last Call
   └ {"message":"Thanks for reporting!"}
-
 ---
 ● coder_report_task: Snake game built and verified - all tests     
 passing, game runs successfully                                    

lib/msgfmt/testdata/format/copilot/thinking/expected.txt

@@ -4,6 +4,4 @@
    $ find . -type f -name "*.ts" -o -name "*.tsx" -o -name "*.js" -o -name "*.jsx" | xargs grep -l "useEffect.*checkServerStatus\|Set up polling for messages and server status" 2>/dev/null
    ↪ 1 line...
 
- ◉ Thinking (Esc to cancel)
-
- ~/Documents/work/.../agentapi [⎇ main*]     claude-haiku-4.5 (1x)
+ ◉ Thinking (Esc to cancel)