diff --git a/src/chunks/chunks.odin b/src/chunks/chunks.odin
index e3f61ef..a5412ae 100644
--- a/src/chunks/chunks.odin
+++ b/src/chunks/chunks.odin
@@ -1,6 +1,7 @@
 package chunks
 
 import "base:runtime"
+import "core:fmt"
 import "core:io"
 import "core:os"
 
@@ -42,3 +43,27 @@ Error :: union #shared_nil {
 	Read_Error,
 	Write_Error,
 }
+
+// -----------------------------------------
+
+@(require_results)
+format_error :: proc(ferr: Error) -> string {
+	if ferr == nil do return ""
+
+	switch e in ferr {
+		case nil:
+			return ""
+		case runtime.Allocator_Error:
+			return fmt.tprintf("allocator: {}", e)
+		case io.Error:
+			return fmt.tprintf("io: {}", e)
+		case os.Error:
+			return fmt.tprintf("os: {}", e)
+		case Read_Error:
+			return fmt.tprintf("chunks: {}", read_error_strings[e])
+		case Write_Error:
+			return fmt.tprintf("chunks: {}", write_error_strings[e])
+	}
+
+	return "unknown error"
+}
diff --git a/src/chunks/read_assets.odin b/src/chunks/read_assets.odin
index 7b8fae9..6ed1d12 100644
--- a/src/chunks/read_assets.odin
+++ b/src/chunks/read_assets.odin
@@ -30,7 +30,6 @@ read_file :: proc(
 	// Check filesystem first, so chunks can be overriden
 	if os.exists(path) {
 		// Open file
-		fmt.println("searching:", path)
 		file := os.open(path, {.Read}) or_return
 		defer os.close(file)
 
@@ -92,5 +91,6 @@ read_file :: proc(
 		return bytes, nil
 	}
 
-	return nil, .File_Not_Exist
+	fmt.eprintln("asset: ", path)
+	return nil, .Asset_Not_Exist
 }
diff --git a/src/chunks/reader.odin b/src/chunks/reader.odin
index fdc97fd..99e7811 100644
--- a/src/chunks/reader.odin
+++ b/src/chunks/reader.odin
@@ -14,13 +14,22 @@ Reader :: struct {
 Read_Error :: enum u8 {
 	None             = 0,
 	File_Not_A_Chunk = 1,
-	File_Not_Exist   = 2,
+	Asset_Not_Exist  = 2,
 	Unimplemented    = 127,
 	Okay             = None,
 }
 
 // -----------------------------------------
 
+read_error_strings := #sparse[Read_Error]string { 	// enumerated array
+	.None             = "",
+	.File_Not_A_Chunk = "file is not a chunk file",
+	.Asset_Not_Exist  = "asset does not exist",
+	.Unimplemented    = "feature is unimplemented",
+}
+
+// -----------------------------------------
+
 reader_init :: proc(
 	output: ^os.File,
 	allocator := context.allocator,
diff --git a/src/chunks/write_assets.odin b/src/chunks/write_assets.odin
index dc5915a..bc1102c 100644
--- a/src/chunks/write_assets.odin
+++ b/src/chunks/write_assets.odin
@@ -26,8 +26,9 @@ write_assets :: proc(
 	number_of_assets := len(entries)
 
 	if size_per_chunk < w.asset_table.data_offset {
-		fmt.eprintln(
-			"error: chunk size too small to hold asset index:",
+		fmt.eprintf(
+			"chunk size: {}\nasset index size: {}\n",
+			size_per_chunk,
 			w.asset_table.data_offset,
 		)
 		return .Chunk_Size_Too_Small
@@ -160,22 +161,13 @@ create_new_chunk :: proc(
 	) or_return
 	defer delete(chunk_path, allocator)
 	if os.exists(chunk_path) {
-		rm_err := os.remove(chunk_path)
-		if rm_err != nil {
-			fmt.eprintln("error: remove old chunk failed:", rm_err)
-			return {}, rm_err
-		}
+		os.remove(chunk_path) or_return
 	}
 
 	if w.chunk_file != nil do os.close(w.chunk_file) // close previous
 
 	// Create new chunk
-	cf_err: os.Error
-	w.chunk_file, cf_err = os.create(chunk_path)
-	if cf_err != nil {
-		fmt.eprintln("error: create new chunk failed:", cf_err)
-		return {}, cf_err
-	}
+	w.chunk_file = os.create(chunk_path) or_return
 
 	chunk_stream = os.to_stream(w.chunk_file)
 
@@ -183,34 +175,29 @@ create_new_chunk :: proc(
 }
 
 @(private)
-open_asset :: proc(w: ^Writer, path: string) -> (io.Stream, u64, Error) {
+open_asset :: proc(
+	w: ^Writer,
+	path: string,
+) -> (
+	asset_stream: io.Stream,
+	asset_size: u64,
+	err: Error,
+) {
 	if w.asset_file != nil do os.close(w.asset_file) // close previous
 
 	// Open asset
-	asset, open_err := os.open(path, {.Read})
-	if open_err != nil {
-		fmt.eprintln("error: asset open failed:", open_err)
-		return {}, {}, open_err
-	}
+	asset := os.open(path, {.Read}) or_return
 
 	// Asset size
-	asset_stream := os.to_stream(asset)
-	asset_size, size_err := io.size(asset_stream)
-	if size_err != nil {
-		fmt.eprintln("error: asset size failed:", size_err)
-		return {}, {}, size_err
-	}
+	asset_stream = os.to_stream(asset)
+	asset_size = cast(u64)io.size(asset_stream) or_return
 
 	return asset_stream, cast(u64)asset_size, nil
 }
 
 @(private)
 write_chunk :: proc(dst: io.Stream, src: io.Stream, n: u64) -> Error {
-	w, err := io.copy_n(dst, src, cast(i64)n)
-	if err != nil {
-		fmt.eprintln("error: chunk write error:", err)
-		return err
-	}
+	w := io.copy_n(dst, src, cast(i64)n) or_return
 
 	return nil
 }
diff --git a/src/chunks/write_metadata.odin b/src/chunks/write_metadata.odin
index 3346b86..5a2bd82 100644
--- a/src/chunks/write_metadata.odin
+++ b/src/chunks/write_metadata.odin
@@ -24,11 +24,7 @@ write_metadata :: proc(
 
 	chunk_path := compute_chunk_path(output_path, 0, allocator) or_return
 	defer delete(chunk_path, allocator)
-	chunk_file, err := os.open(chunk_path, {.Read, .Write})
-	if err != nil {
-		fmt.eprintln("error: open chunk failed: ", err)
-		return err
-	}
+	chunk_file := os.open(chunk_path, {.Read, .Write}) or_return
 	defer os.close(chunk_file)
 
 	write_header(w, chunk_file, number_of_assets, size_per_chunk, compression)
@@ -62,11 +58,7 @@ write_header :: proc(
 
 	// Write header
 	header_bytes := mem.ptr_to_bytes(&header)
-	n, err := os.write_at(chunk_file, header_bytes, 0)
-	if err != nil {
-		fmt.eprintln("error: chunk write error:", err)
-		return err
-	}
+	n := os.write_at(chunk_file, header_bytes, 0) or_return
 
 	return nil
 }
@@ -91,7 +83,7 @@ write_asset_index :: proc(
 		// TODO: Move to cli validation so it happens sooner
 		path_length := len(f.relpath)
 		if path_length > 512 {
-			fmt.eprintln("error: path exeeds maximum of 512:", f.relpath)
+			fmt.eprintf("path: {} ({})\n", f.relpath, path_length)
 			return .Path_Too_Large
 		}
 
@@ -107,15 +99,11 @@ write_asset_index :: proc(
 	assert(len(index_bytes) % size_of(Asset_Index) == 0) // clean multiple
 
 	// Write asset index
-	n, err := os.write_at(
+	n := os.write_at(
 		chunk_file,
 		index_bytes,
 		cast(i64)w.asset_table.asset_index_offset,
-	)
-	if err != nil {
-		fmt.eprintln("error: chunk write error:", err)
-		return err
-	}
+	) or_return
 
 	return nil
 }
diff --git a/src/chunks/writer.odin b/src/chunks/writer.odin
index d4a1e4d..b4858b3 100644
--- a/src/chunks/writer.odin
+++ b/src/chunks/writer.odin
@@ -24,6 +24,15 @@ Write_Error :: enum u8 {
 
 // -----------------------------------------
 
+write_error_strings := #sparse[Write_Error]string { 	// enumerated array
+	.None                 = "",
+	.Chunk_Size_Too_Small = "chunk size too small to hold asset index",
+	.Path_Too_Large       = "path exeeds maximum of 512",
+	.Unimplemented        = "feature is unimplemented",
+}
+
+// -----------------------------------------
+
 writer_init :: proc(
 	number_of_assets: u64,
 	allocator := context.allocator,
@@ -55,8 +64,8 @@ compute_chunk_path :: proc(
 	chunk_index: int,
 	allocator: runtime.Allocator,
 ) -> (
-	string,
-	Error,
+	chunk_path: string,
+	err: Error,
 ) {
 
 	@(static) buf: [20]u8
@@ -65,11 +74,7 @@ compute_chunk_path :: proc(
 	chunk_name := strings.concatenate({CHUNK, chunk_index_str}, allocator)
 	defer delete(chunk_name, allocator)
 
-	chunk_path, c_err := os.join_path({output_path, chunk_name}, allocator)
-	if c_err != nil {
-		fmt.eprintln("error: chunk join path failed:", c_err)
-		return {}, c_err
-	}
+	chunk_path = os.join_path({output_path, chunk_name}, allocator) or_return
 
 	return chunk_path, nil // owning string
 }
diff --git a/src/file/file.odin b/src/file/file.odin
index 818726d..687ed71 100644
--- a/src/file/file.odin
+++ b/src/file/file.odin
@@ -17,6 +17,12 @@ File_Error :: enum u8 {
 	Okay            = None,
 }
 
+file_error_strings := #sparse[File_Error]string { 	// enumerated array
+	.None            = "",
+	.Not_A_Directory = "path is not a directory",
+	.Unimplemented   = "feature is unimplemented",
+}
+
 // -----------------------------------------
 
 get_working_dir :: proc(allocator := context.allocator) -> (string, Error) {
@@ -28,3 +34,19 @@ get_working_dir :: proc(allocator := context.allocator) -> (string, Error) {
 
 	return wd, nil
 }
+
+@(require_results)
+format_error :: proc(ferr: Error) -> string {
+	if ferr == nil do return ""
+
+	switch e in ferr {
+		case nil:
+			return ""
+		case os.Error:
+			return fmt.tprintf("os: {}", e)
+		case File_Error:
+			return fmt.tprintf("file: {}", file_error_strings[e])
+	}
+
+	return "unknown error"
+}
diff --git a/src/file/list_dir.odin b/src/file/list_dir.odin
index dfbf2f9..d01685c 100644
--- a/src/file/list_dir.odin
+++ b/src/file/list_dir.odin
@@ -67,7 +67,7 @@ list_dir_recursive_by_path_impl :: proc(
 	Error,
 ) {
 	if !os.is_dir(path) {
-		fmt.eprintln("error: path is not a directory:", path)
+		fmt.eprintln("path:", path)
 		return {}, .Not_A_Directory
 	}
 
@@ -96,18 +96,10 @@ list_dir_queue :: proc(
 	path := pop(queue)
 	defer delete(path, queue^.allocator)
 
-	f, open_err := os.open(path, {.Read})
-	if open_err != nil {
-		fmt.eprintln("error: open failed:", open_err)
-		return open_err
-	}
+	f := os.open(path, {.Read}) or_return
 	defer os.close(f)
 
-	entries, read_err := os.read_all_directory(f, allocator)
-	if read_err != nil {
-		fmt.eprintln("error: read directory failed:", read_err)
-		return read_err
-	}
+	entries := os.read_all_directory(f, allocator) or_return
 	defer os.file_info_slice_delete(entries, allocator)
 
 	// Reserve space for new entries, minor waste as directories are also counted.
diff --git a/src/main.odin b/src/main.odin
index 28daff5..46ffa26 100644
--- a/src/main.odin
+++ b/src/main.odin
@@ -1,5 +1,6 @@
 package main
 
+import "core:fmt"
 import "core:os"
 
 import "src:chunks"
@@ -28,8 +29,11 @@ main :: proc() {
 	// fmt.println("compression:", opts.compression)
 	// fmt.println("size:", opts.size)
 
-	entries, e_err := file.list_dir_recursive(opts.input, working_dir)
-	if e_err != nil do os.exit(LIST_DIR_ERR)
+	entries, ld_err := file.list_dir_recursive(opts.input, working_dir)
+	if ld_err != nil {
+		fmt.eprintln("error:", file.format_error(ld_err))
+		os.exit(LIST_DIR_ERR)
+	}
 	defer file.delete_entries(&entries)
 
 	w := chunks.writer_init(cast(u64)len(entries))
@@ -42,7 +46,10 @@ main :: proc() {
 		opts.size,
 		opts.compression,
 	)
-	if wa_err != nil do os.exit(WRITE_ASSETS_ERR)
+	if wa_err != nil {
+		fmt.eprintln("error:", chunks.format_error(wa_err))
+		os.exit(WRITE_ASSETS_ERR)
+	}
 
 	wm_err := chunks.write_metadata(
 		&w,
@@ -51,7 +58,10 @@ main :: proc() {
 		opts.size,
 		opts.compression,
 	)
-	if wm_err != nil do os.exit(WRITE_METADATA_ERR)
+	if wm_err != nil {
+		fmt.eprintln("error:", chunks.format_error(wm_err))
+		os.exit(WRITE_METADATA_ERR)
+	}
 }
 
 // TODO: .chunkignore