feat(repl): clarify displayed search patterns

Author: Motta Kin

internal/cli/repl/output/output.go

@@ -290,6 +290,7 @@ func formatSearchInput(input map[string]any, workingDir string) string {
 	pattern, _ := input["pattern"].(string)
 	if pattern != "" {
 		pattern = compactDisplayValue(pattern, maxDisplayPatternRunes)
+		pattern = formatSearchPatternForDisplay(pattern)
 	}
 	path, _ := input["path"].(string)
 	if path != "" {
@@ -308,6 +309,18 @@ func formatSearchInput(input map[string]any, workingDir string) string {
 	}
 }
 
+func formatSearchPatternForDisplay(pattern string) string {
+	var b strings.Builder
+	b.Grow(len(pattern))
+	for i := 0; i < len(pattern); i++ {
+		if pattern[i] == '\\' && i+1 < len(pattern) && strings.ContainsRune(`\\.^$*+?()[]{}|`, rune(pattern[i+1])) {
+			i++
+		}
+		b.WriteByte(pattern[i])
+	}
+	return b.String()
+}
+
 func formatGenericInput(input map[string]any) string {
 	keys := make([]string, 0, len(input))
 	for k := range input {

internal/cli/repl/output/output_test.go

@@ -145,6 +145,19 @@ func TestFormatToolInput_GrepShowsQuotedPatternInPathBaseName(t *testing.T) {
 	}
 }
 
+func TestFormatToolInput_GrepUnescapesLiteralRegexPunctuationForDisplay(t *testing.T) {
+	pattern := `\[Unreleased\]|\[0\.38\.1\] \\d+ \\w+ \\s+ \\b`
+	got := FormatToolInput("grep", map[string]any{"pattern": pattern, "path": "CHANGELOG.md"}, "/tmp/project")
+
+	want := `[Unreleased]|[0.38.1] \d+ \w+ \s+ \b in CHANGELOG.md`
+	if got != want {
+		t.Fatalf("expected display-only literal unescaping, got %q, want %q", got, want)
+	}
+	if pattern != `\[Unreleased\]|\[0\.38\.1\] \\d+ \\w+ \\s+ \\b` {
+		t.Fatalf("expected original pattern to remain unchanged, got %q", pattern)
+	}
+}
+
 func TestFormatToolInput_CallMCPToolShowsOnlyServerAndTool(t *testing.T) {
 	got := FormatToolInput("call_mcp_tool", map[string]any{
 		"server": "context7",