refactor(agent): refine prompts and code cleaning logic

- Remove unnecessary comments in agent.go for cleaner code
- Update system prompt to enforce exact header comment format
- Adjust progress logging format
- Fix CleanCodeResponse to properly strip markdown fences
- Update StreamSilent comment to include agent usage

cmd/agent.go

@@ -26,7 +26,6 @@ var agentCmd = &cobra.Command{
 
 		color.Yellow("🔍 Agent mode activated. Scanning project...")
 
-		// Discover all .go files
 		var files []string
 		filepath.Walk(".", func(path string, info os.FileInfo, err error) error {
 			if err != nil || info.IsDir() {
@@ -45,7 +44,6 @@ var agentCmd = &cobra.Command{
 
 		color.Yellow("📄 Found %d files. Asking Grok for a plan...", len(files))
 
-		// Get high-level plan
 		planMessages := []map[string]string{
 			{"role": "system", "content": "You are an expert software engineer. Given an instruction and list of files, return a clear plan: which files to change and a brief description of what to do in each. List files one per line."},
 			{"role": "user", "content": fmt.Sprintf("Instruction: %s\n\nFiles:\n%s", instruction, strings.Join(files, "\n"))},
@@ -66,7 +64,7 @@ var agentCmd = &cobra.Command{
 
 		applyAll := false
 		for i, file := range files {
-			color.Yellow("[%d/%d] → Processing: %s", i+1, len(files), file)
+			color.Yellow("[%d/%d] → %s", i+1, len(files), file)
 
 			original, err := os.ReadFile(file)
 			if err != nil {
@@ -77,18 +75,16 @@ var agentCmd = &cobra.Command{
 			backupPath := file + ".bak"
 			_ = os.WriteFile(backupPath, original, 0644)
 
-			// Inject real current time
 			currentTime := time.Now().Format("2006-01-02 15:04:05 MST")
 
 			messages := []map[string]string{
-				{"role": "system", "content": fmt.Sprintf("You are an expert programmer. Return ONLY the complete updated file content. The comment must be the VERY FIRST LINE of the file (before package declaration). Current time is %s.", currentTime)},
+				{"role": "system", "content": fmt.Sprintf("You are an expert programmer. The VERY FIRST LINE of the returned file MUST be a header comment in this exact format: '// Last modified: %s'. Then return the complete updated file content. No explanations, no markdown, no diffs, no extra text.", currentTime)},
 				{"role": "user", "content": fmt.Sprintf("File: %s\n\nOriginal content:\n%s\n\nTask: %s", filepath.Base(file), original, instruction)},
 			}
 
-			raw := client.StreamSilent(messages, "grok-4-1-fast-non-reasoning") // faster model for edits
+			raw := client.StreamSilent(messages, "grok-4-1-fast-non-reasoning")
 			newContent := grok.CleanCodeResponse(raw)
 
-			// Show clean diff preview
 			color.Cyan("Proposed changes for %s:", filepath.Base(file))
 			fmt.Println("--- a/" + filepath.Base(file))
 			fmt.Println("+++ b/" + filepath.Base(file))

internal/grok/client.go

@@ -1,5 +1,3 @@
-// Updated at: 2023-10-05 12:00:00
-
 package grok
 
 import (
@@ -36,7 +34,7 @@ func (c *Client) Stream(messages []map[string]string, model string) string {
 	return c.streamInternal(messages, model, true)
 }
 
-// StreamSilent returns the full text without printing (used by TUI)
+// StreamSilent returns the full text without printing (used by TUI and agent)
 func (c *Client) StreamSilent(messages []map[string]string, model string) string {
 	return c.streamInternal(messages, model, false)
 }
@@ -94,7 +92,8 @@ func (c *Client) streamInternal(messages []map[string]string, model string, prin
 
 // CleanCodeResponse removes markdown fences and returns pure code content
 func CleanCodeResponse(text string) string {
-	text = strings.ReplaceAll(text, "", "")
+	text = strings.ReplaceAll(text, "```go", "")
+	text = strings.ReplaceAll(text, "```", "")
 	text = strings.TrimSpace(text)
 	return text
-}
+}