diff --git a/README.md b/README.md
index 969988a..a0d8b07 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ After installing, please review the [usage guide](https://github.com/rwinkhart/M
 - [ ] Re-implement init menu
 - [ ] Implement tweak menu
 ### Release v0.4.0
-- [ ] Switch to fully-compliant Markdown (do not preserve new lines)
+- [ ] Switch to fully compliant Markdown (do not preserve new lines)
 - [ ] Evaluate defaulting to building w/Bean over Glamour
     - [ ] Verify having Glamour in go.mod does not impact binary size/speed (drop it if it does)
 ### Release v0.5.0
diff --git a/go.mod b/go.mod
index 1a10514..f3d3b34 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/Trojan2021/BEAN v0.0.0-20241210230804-8f294833b514
 	github.com/charmbracelet/glamour v0.7.0
 	github.com/rwinkhart/go-boilerplate v0.0.0-20250529185306-e2e64d7fa43b
-	github.com/rwinkhart/libmutton v0.3.2-0.20250529233550-74b8261bc88f
+	github.com/rwinkhart/libmutton v0.3.2-0.20250530020557-a1c47b06a13e
 	golang.org/x/term v0.32.0
 )
 
diff --git a/go.sum b/go.sum
index 699ba3d..6f6e216 100644
--- a/go.sum
+++ b/go.sum
@@ -61,8 +61,8 @@ github.com/rwinkhart/go-boilerplate v0.0.0-20250529185306-e2e64d7fa43b h1:ENgsUl
 github.com/rwinkhart/go-boilerplate v0.0.0-20250529185306-e2e64d7fa43b/go.mod h1:cnzIF45I0FCOvE4YIB+26pLCUx2kWyY2llKYZruNaRY=
 github.com/rwinkhart/go-winio-easy-pipe-handles v0.0.0-20250407031321-96994a0e8410 h1:NhHwFM3Pgm6zRUfFKvi0p5ndjfFbVWsRwmmhyFlG4PE=
 github.com/rwinkhart/go-winio-easy-pipe-handles v0.0.0-20250407031321-96994a0e8410/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
-github.com/rwinkhart/libmutton v0.3.2-0.20250529233550-74b8261bc88f h1:HL3z/oTAqssmILfA3Z0IAscK1sbxFp8/g9GnhHSNLSY=
-github.com/rwinkhart/libmutton v0.3.2-0.20250529233550-74b8261bc88f/go.mod h1:uIz4AJcXW7ZHvvoPlLNWQofTBIbFa1UJ2JI6O+FSQ60=
+github.com/rwinkhart/libmutton v0.3.2-0.20250530020557-a1c47b06a13e h1:b+4AzdZj5gEbIg8riqP5W4Y5LG7tIZTbiV69af846jI=
+github.com/rwinkhart/libmutton v0.3.2-0.20250530020557-a1c47b06a13e/go.mod h1:uIz4AJcXW7ZHvvoPlLNWQofTBIbFa1UJ2JI6O+FSQ60=
 github.com/rwinkhart/peercred-mini v0.1.0 h1:TiS6u8cEWzW55S9X4iVpU72Iuy/NG6rMUJMtUEVEFLw=
 github.com/rwinkhart/peercred-mini v0.1.0/go.mod h1:+x4Mxc2veE+YePSOpcUasjimh7n799c1KraLuQwHR20=
 github.com/rwinkhart/rcw v0.2.0 h1:/rFgJ+20OSThipKAX5KPwW2xbPpgh1zl49THmEkkPis=
diff --git a/mutn.go b/mutn.go
index dbf71ef..38aa753 100644
--- a/mutn.go
+++ b/mutn.go
@@ -44,7 +44,10 @@ func main() {
 					case "show", "-s":
 						cli.EntryReaderDecrypt(targetLocation, false)
 					case "copy":
-						core.CopyArgument(targetLocation, 0)
+						err := core.CopyArgument(targetLocation, 0)
+						if err != nil {
+							back.PrintError("Failed to copy passphrase to clipboard: "+err.Error(), global.ErrorClipboard, true)
+						}
 					case "edit":
 						cli.EditEntryField(targetLocation, true, 0)
 					case "gen":
@@ -52,7 +55,10 @@ func main() {
 					case "add":
 						cli.AddEntry(targetLocation, true, 0)
 					case "shear":
-						syncclient.ShearRemoteFromClient(args[1], false) // pass the incomplete path as the server and all clients (reading from the deletions directory) will have a different home directory
+						err := syncclient.ShearRemoteFromClient(args[1], false) // pass the incomplete path as the server and all clients (reading from the deletions directory) will have a different home directory
+						if err != nil {
+							back.PrintError("Failed to shear target: "+err.Error(), back.ErrorWrite, true)
+						}
 					default:
 						cli.HelpMain()
 					}
@@ -88,7 +94,10 @@ func main() {
 					default:
 						cli.HelpCopy()
 					}
-					core.CopyArgument(targetLocation, field)
+					err := core.CopyArgument(targetLocation, field)
+					if err != nil {
+						back.PrintError("Failed to copy field to clipboard: "+err.Error(), global.ErrorClipboard, true)
+					}
 				case "edit":
 					var field int // indicates which (numbered) field to edit
 					switch args[3] {
@@ -151,7 +160,10 @@ func main() {
 					case "note", "-n":
 						cli.AddEntry(targetLocation, true, 2)
 					case "folder", "-f":
-						syncclient.AddFolderRemoteFromClient(args[1], false) // pass the incomplete path as the server will have a different home directory
+						err := syncclient.AddFolderRemoteFromClient(args[1], false) // pass the incomplete path as the server will have a different home directory
+						if err != nil {
+							back.PrintError("Failed to add folder: "+err.Error(), back.ErrorWrite, true)
+						}
 					default:
 						cli.HelpAdd()
 					}
@@ -164,13 +176,18 @@ func main() {
 		} else {
 			switch args[1] {
 			case "clipclear":
-				core.ClipClearArgument()
+				err := core.ClipClearArgument()
+				if err != nil {
+					back.PrintError("Failure occurred in clipboard clearing process: "+err.Error(), global.ErrorClipboard, true)
+				}
 			case "startrcwd":
 				crypt.RCWDArgument()
 			case "sync":
-				syncclient.RunJob(true, false)
+				_, err := syncclient.RunJob(true, false)
+				if err != nil {
+					back.PrintError("Failed to sync entries: "+err.Error(), global.ErrorSyncProcess, true)
+				}
 			case "init":
-				const fallbackEditor = "vi" // TODO "edit" for Windows
 				var rcwPass []byte
 				for { // get master passphrase
 					rcwPass = front.InputHidden("Master passphrase:")
@@ -181,7 +198,7 @@ func main() {
 					break
 				}
 				err := core.LibmuttonInit(front.Input,
-					[][3]string{{"MUTN", "textEditor", cmp.Or(front.Input("Text editor (leave blank for $EDITOR, falls back to \""+fallbackEditor+"\"):"), os.Getenv("EDITOR"), fallbackEditor)}},
+					[][3]string{{"MUTN", "textEditor", cmp.Or(front.Input("Text editor (leave blank for $EDITOR, falls back to \""+cli.FallbackEditor+"\"):"), os.Getenv("EDITOR"), cli.FallbackEditor)}},
 					rcwPass, false)
 				if err != nil {
 					back.PrintError("Initialization failed: "+err.Error(), 0, true)
diff --git a/src/cli/add.go b/src/cli/add.go
index 13cb81b..0769fe8 100644
--- a/src/cli/add.go
+++ b/src/cli/add.go
@@ -1,6 +1,7 @@
 package cli
 
 import (
+	"github.com/rwinkhart/go-boilerplate/back"
 	"github.com/rwinkhart/go-boilerplate/front"
 	"github.com/rwinkhart/libmutton/core"
 )
@@ -9,7 +10,10 @@ import (
 // Requires: entryType (0 = standard password entry, 1 = auto-generated password entry, 2 = note-only entry).
 func AddEntry(targetLocation string, hideSecrets bool, entryType uint8) {
 	// ensure targetLocation is valid
-	core.EntryAddPrecheck(targetLocation)
+	_, err := core.EntryAddPrecheck(targetLocation)
+	if err != nil {
+		back.PrintError("Failed to add entry: "+err.Error(), back.ErrorWrite, true)
+	}
 
 	var unencryptedEntry []string
 
diff --git a/src/cli/edit.go b/src/cli/edit.go
index 9e0db88..201c2e5 100644
--- a/src/cli/edit.go
+++ b/src/cli/edit.go
@@ -17,7 +17,10 @@ import (
 func RenameCli(oldLocationIncomplete string) {
 	// prompt user for new location and rename
 	newLocationIncomplete := front.Input("New location:")
-	syncclient.RenameRemoteFromClient(oldLocationIncomplete, newLocationIncomplete, false)
+	err := syncclient.RenameRemoteFromClient(oldLocationIncomplete, newLocationIncomplete, false)
+	if err != nil {
+		back.PrintError("Failed to rename entry: "+err.Error(), back.ErrorWrite, true)
+	}
 
 	// exit is done from sync.RenameRemoteFromClient
 }
@@ -25,7 +28,10 @@ func RenameCli(oldLocationIncomplete string) {
 // EditEntryField edits a field of an entry at targetLocation (user input).
 func EditEntryField(targetLocation string, hideSecrets bool, field int) {
 	// fetch old entry data (with all required lines present)
-	unencryptedEntry := core.GetOldEntryData(targetLocation, field)
+	unencryptedEntry, err := core.GetOldEntryData(targetLocation, field)
+	if err != nil {
+		back.PrintError("Failed to fetch entry data: "+err.Error(), back.ErrorRead, true)
+	}
 
 	// edit the field
 	switch field {
@@ -57,7 +63,10 @@ func EditEntryField(targetLocation string, hideSecrets bool, field int) {
 // GenUpdate generates a new password for an entry at targetLocation (user input).
 func GenUpdate(targetLocation string, hideSecrets bool) {
 	// fetch old entry data
-	unencryptedEntry := core.GetOldEntryData(targetLocation, 0)
+	unencryptedEntry, err := core.GetOldEntryData(targetLocation, 0)
+	if err != nil {
+		back.PrintError("Failed to fetch entry data: "+err.Error(), back.ErrorRead, true)
+	}
 
 	// generate a new password
 	unencryptedEntry[0] = inputPasswordGen()
diff --git a/src/cli/entryList.go b/src/cli/entryList.go
index a2bcf9c..2354a81 100644
--- a/src/cli/entryList.go
+++ b/src/cli/entryList.go
@@ -79,7 +79,10 @@ func printFileEntry(entry string, lastSlash, charCounter, indent int, colorAlter
 
 // EntryListGen generates and displays the full libmutton entry list.
 func EntryListGen() {
-	fileList, dirList := synccommon.WalkEntryDir()
+	fileList, dirList, err := synccommon.WalkEntryDir()
+	if err != nil {
+		back.PrintError("Failed to generate entry list: "+err.Error(), back.ErrorRead, true)
+	}
 
 	// print header bar w/total entry count
 	fmt.Print("\n"+ansiBlackOnWhite, len(fileList), " libmutton entries:"+back.AnsiReset)
diff --git a/src/cli/entryReader.go b/src/cli/entryReader.go
index 40088d3..0c2ed27 100644
--- a/src/cli/entryReader.go
+++ b/src/cli/entryReader.go
@@ -6,6 +6,7 @@ import (
 
 	"github.com/rwinkhart/go-boilerplate/back"
 	"github.com/rwinkhart/libmutton/crypt"
+	"github.com/rwinkhart/libmutton/global"
 	"github.com/rwinkhart/libmutton/syncclient"
 )
 
@@ -65,7 +66,10 @@ fieldLoop:
 	}
 
 	if syncEnabled {
-		syncclient.RunJob(false, false)
+		_, err := syncclient.RunJob(false, false)
+		if err != nil {
+			back.PrintError("Failed to sync entries: "+err.Error(), global.ErrorSyncProcess, true)
+		}
 	}
 
 	os.Exit(0)
@@ -74,7 +78,11 @@ fieldLoop:
 // EntryReaderDecrypt is a wrapper for EntryReader that first decrypts an RCW-wrapped file before sending it to EntryReader.
 func EntryReaderDecrypt(targetLocation string, hideSecrets bool) {
 	if isFile, _ := back.TargetIsFile(targetLocation, true, 2); isFile {
-		EntryReader(crypt.DecryptFileToSlice(targetLocation), hideSecrets, false) // never sync if decrypting straight to EntryReader, as this means the entry could not have been modified
+		decBytes, err := crypt.DecryptFileToSlice(targetLocation)
+		if err != nil {
+			back.PrintError("Failed to decrypt entry: "+err.Error(), global.ErrorDecryption, true)
+		}
+		EntryReader(decBytes, hideSecrets, false) // never sync if decrypting straight to EntryReader, as this means the entry could not have been modified
 	}
 	// do not exit, as this is the job of EntryReader
 }
diff --git a/src/cli/initUNIX.go b/src/cli/initUNIX.go
index 0712ed1..360b390 100644
--- a/src/cli/initUNIX.go
+++ b/src/cli/initUNIX.go
@@ -2,4 +2,4 @@
 
 package cli
 
-const fallbackEditor = "vi" // vi is pre-installed on most UNIX-like systems
+const FallbackEditor = "vi" // vi is pre-installed on most UNIX-like systems
diff --git a/src/cli/initWIN.go b/src/cli/initWIN.go
index 5b49d2c..486c679 100644
--- a/src/cli/initWIN.go
+++ b/src/cli/initWIN.go
@@ -2,4 +2,4 @@
 
 package cli
 
-const fallbackEditor = "edit" // "edit" is the Microsoft-developed CLI text editor
+const FallbackEditor = "edit" // "edit" is the Microsoft-developed CLI text editor
diff --git a/src/cli/utilitiesMisc.go b/src/cli/utilitiesMisc.go
index 1d94935..2a71b4a 100644
--- a/src/cli/utilitiesMisc.go
+++ b/src/cli/utilitiesMisc.go
@@ -31,7 +31,10 @@ func inputPasswordGen() string {
 func writeEntryCLI(targetLocation string, unencryptedEntry []string, hideSecrets bool) {
 	if core.EntryIsNotEmpty(unencryptedEntry) {
 		// write the entry to the target location
-		core.WriteEntry(targetLocation, []byte(strings.Join(unencryptedEntry, "\n")))
+		err := core.WriteEntry(targetLocation, []byte(strings.Join(unencryptedEntry, "\n")))
+		if err != nil {
+			back.PrintError("Failed to write entry: "+err.Error(), back.ErrorWrite, true)
+		}
 		// preview the entry
 		fmt.Println(back.AnsiBold + "\nEntry Preview:" + back.AnsiReset)
 		EntryReader(unencryptedEntry, hideSecrets, true)