diff --git a/cmd/super/root/command.go b/cmd/super/root/command.go
index 1a526ae9a1..aa2c3fe134 100644
--- a/cmd/super/root/command.go
+++ b/cmd/super/root/command.go
@@ -146,7 +146,7 @@ func (c *Command) Run(args []string) error {
 	}
 	paths, ast, null, err := c.queryFlags.ParseSourcesAndInputs(c.query, args)
 	if err != nil {
-		return fmt.Errorf("super: %w", err)
+		return err
 	}
 	zctx := super.NewContext()
 	local := storage.NewLocalEngine()
diff --git a/cmd/super/ztests/from-file-error.yaml b/cmd/super/ztests/from-file-error.yaml
index 1bca163911..a4c526c014 100644
--- a/cmd/super/ztests/from-file-error.yaml
+++ b/cmd/super/ztests/from-file-error.yaml
@@ -9,4 +9,4 @@ inputs:
 outputs:
   - name: stderr
     regexp: |
-      a.jsup: file:///.*/a.jsup: file does not exist.*
+      a.jsup: file does not exist.*
diff --git a/cmd/super/ztests/from-pool-error.yaml b/cmd/super/ztests/from-pool-error.yaml
index 9e1cefa7db..fa2a25a898 100644
--- a/cmd/super/ztests/from-pool-error.yaml
+++ b/cmd/super/ztests/from-pool-error.yaml
@@ -4,4 +4,4 @@ script: |
 outputs:
   - name: stderr
     regexp: |
-      a: file:///.*/a: file does not exist
+      a: file does not exist
diff --git a/cmd/super/ztests/no-files.yaml b/cmd/super/ztests/no-files.yaml
index c71b4ac1ef..fb418a113c 100644
--- a/cmd/super/ztests/no-files.yaml
+++ b/cmd/super/ztests/no-files.yaml
@@ -1,9 +1,9 @@
 script: |
-  ! super -z -c doesnotexist
+  ! super -z doesnotexist
 
 outputs:
   - name: stdout
     data: ""
   - name: stderr
     data: |
-      super: no data source found
+      doesnotexist: file does not exist
diff --git a/cmd/super/ztests/single-arg-error.yaml b/cmd/super/ztests/single-arg-error.yaml
index 3787b0f86e..e09f7bcb16 100644
--- a/cmd/super/ztests/single-arg-error.yaml
+++ b/cmd/super/ztests/single-arg-error.yaml
@@ -4,6 +4,6 @@ script: |
 outputs:
   - name: stderr
     data: |
-      super: parse error at line 1, column 26:
+      parse error at line 1, column 26:
       file sample.jsup | count(
                            === ^ ===
diff --git a/compiler/parser/ztests/syntax-error.yaml b/compiler/parser/ztests/syntax-error.yaml
index 091c594f8a..53b7af9ee8 100644
--- a/compiler/parser/ztests/syntax-error.yaml
+++ b/compiler/parser/ztests/syntax-error.yaml
@@ -8,6 +8,6 @@ inputs:
 outputs:
   - name: stderr
     data: |
-      super: parse error at line 1, column 12:
+      parse error at line 1, column 12:
       count() by ,x,y
              === ^ ===
diff --git a/docs/tutorials/schools.md b/docs/tutorials/schools.md
index 890fd3aba8..60e6fc705e 100644
--- a/docs/tutorials/schools.md
+++ b/docs/tutorials/schools.md
@@ -235,7 +235,7 @@ super -z -c 'Defunct=' *.jsup
 ```
 produces
 ```mdtest-output
-super: parse error at line 1, column 9:
+parse error at line 1, column 9:
 Defunct=
     === ^ ===
 ```
diff --git a/lake/data/reader.go b/lake/data/reader.go
index e48ad0f458..237dba67da 100644
--- a/lake/data/reader.go
+++ b/lake/data/reader.go
@@ -2,6 +2,7 @@ package data
 
 import (
 	"context"
+	"fmt"
 	"io"
 
 	"github.com/brimdata/super/lake/seekindex"
@@ -22,7 +23,7 @@ func (o *Object) NewReader(ctx context.Context, engine storage.Engine, path *sto
 	objectPath := o.SequenceURI(path)
 	reader, err := engine.Get(ctx, objectPath)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("%s: %w", objectPath, err)
 	}
 	var r io.Reader
 	var readBytes int64
diff --git a/lake/ztests/vacuum.yaml b/lake/ztests/vacuum.yaml
index 180a57fab5..0a1dfd3fd4 100644
--- a/lake/ztests/vacuum.yaml
+++ b/lake/ztests/vacuum.yaml
@@ -16,5 +16,5 @@ outputs:
       would vacuum 1 object
       vacuumed 1 object
   - name: stderr
-    regexp:
-      file:.*file does not exist
+    regexp: |
+      file:///.*file does not exist
diff --git a/pkg/storage/file.go b/pkg/storage/file.go
index 8f54737332..eeb1aacbdc 100644
--- a/pkg/storage/file.go
+++ b/pkg/storage/file.go
@@ -3,7 +3,6 @@ package storage
 import (
 	"bytes"
 	"context"
-	"fmt"
 	"io"
 	"io/fs"
 	"os"
@@ -31,26 +30,26 @@ func NewFileSystem() *FileSystem {
 
 func (f *FileSystem) Get(ctx context.Context, u *URI) (Reader, error) {
 	r, err := pkgfs.Open(u.Filepath())
-	return &fileSizer{r, u}, wrapfileError(u, err)
+	return &fileSizer{r, u}, fileErr(err)
 }
 
 func (f *FileSystem) Put(_ context.Context, u *URI) (io.WriteCloser, error) {
 	path := u.Filepath()
 	if err := f.checkPath(path); err != nil {
-		return nil, wrapfileError(u, err)
+		return nil, fileErr(err)
 	}
 	w, err := pkgfs.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, f.perm)
-	return w, wrapfileError(u, err)
+	return w, fileErr(err)
 }
 
 func (f *FileSystem) PutIfNotExists(_ context.Context, u *URI, b []byte) error {
 	path := u.Filepath()
 	if err := f.checkPath(path); err != nil {
-		return wrapfileError(u, err)
+		return fileErr(err)
 	}
 	file, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC|os.O_EXCL, f.perm)
 	if err != nil {
-		return wrapfileError(u, err)
+		return fileErr(err)
 	}
 	_, err = io.Copy(file, bytes.NewReader(b))
 	if err != nil {
@@ -62,7 +61,7 @@ func (f *FileSystem) PutIfNotExists(_ context.Context, u *URI, b []byte) error {
 }
 
 func (f *FileSystem) Delete(_ context.Context, u *URI) error {
-	return wrapfileError(u, os.Remove(u.Filepath()))
+	return fileErr(os.Remove(u.Filepath()))
 }
 
 func (f *FileSystem) DeleteByPrefix(_ context.Context, u *URI) error {
@@ -72,7 +71,7 @@ func (f *FileSystem) DeleteByPrefix(_ context.Context, u *URI) error {
 func (f *FileSystem) Size(_ context.Context, u *URI) (int64, error) {
 	info, err := os.Stat(u.Filepath())
 	if err != nil {
-		return 0, wrapfileError(u, err)
+		return 0, fileErr(err)
 	}
 	return info.Size(), nil
 }
@@ -83,7 +82,7 @@ func (f *FileSystem) Exists(_ context.Context, u *URI) (bool, error) {
 		return false, nil
 	}
 	if err != nil {
-		return false, wrapfileError(u, err)
+		return false, fileErr(err)
 	}
 	return true, nil
 }
@@ -91,7 +90,7 @@ func (f *FileSystem) Exists(_ context.Context, u *URI) (bool, error) {
 func (f *FileSystem) List(ctx context.Context, u *URI) ([]Info, error) {
 	entries, err := os.ReadDir(u.Filepath())
 	if err != nil {
-		return nil, wrapfileError(u, err)
+		return nil, fileErr(err)
 	}
 	infos := make([]Info, len(entries))
 	for i, e := range entries {
@@ -127,9 +126,9 @@ func (f *FileSystem) checkPath(path string) error {
 	return nil
 }
 
-func wrapfileError(uri *URI, err error) error {
+func fileErr(err error) error {
 	if os.IsNotExist(err) {
-		return fmt.Errorf("%s: %w", uri, fs.ErrNotExist)
+		return fs.ErrNotExist
 	}
 	return err
 }
@@ -144,7 +143,7 @@ var _ Sizer = (*fileSizer)(nil)
 func (f *fileSizer) Size() (int64, error) {
 	info, err := os.Stat(f.uri.Filepath())
 	if err != nil {
-		return 0, wrapfileError(f.uri, err)
+		return 0, fileErr(err)
 	}
 	return info.Size(), nil
 }
diff --git a/pkg/storage/s3.go b/pkg/storage/s3.go
index 0bbf948985..990a4e7919 100644
--- a/pkg/storage/s3.go
+++ b/pkg/storage/s3.go
@@ -27,12 +27,12 @@ func NewS3() *S3Engine {
 
 func (s *S3Engine) Get(ctx context.Context, u *URI) (Reader, error) {
 	r, err := s3io.NewReader(ctx, u.String(), s.client)
-	return r, wrapErr(err)
+	return r, s3Err(err)
 }
 
 func (s *S3Engine) Put(ctx context.Context, u *URI) (io.WriteCloser, error) {
 	w, err := s3io.NewWriter(ctx, u.String(), s.client)
-	return w, wrapErr(err)
+	return w, s3Err(err)
 }
 
 func (s *S3Engine) PutIfNotExists(context.Context, *URI, []byte) error {
@@ -40,21 +40,21 @@ func (s *S3Engine) PutIfNotExists(context.Context, *URI, []byte) error {
 }
 
 func (s *S3Engine) Delete(ctx context.Context, u *URI) error {
-	return wrapErr(s3io.Remove(ctx, u.String(), s.client))
+	return s3Err(s3io.Remove(ctx, u.String(), s.client))
 }
 
 func (s *S3Engine) DeleteByPrefix(ctx context.Context, u *URI) error {
-	return wrapErr(s3io.RemoveAll(ctx, u.String(), s.client))
+	return s3Err(s3io.RemoveAll(ctx, u.String(), s.client))
 }
 
 func (s *S3Engine) Size(ctx context.Context, u *URI) (int64, error) {
 	info, err := s3io.Stat(ctx, u.String(), s.client)
-	return info.Size, wrapErr(err)
+	return info.Size, s3Err(err)
 }
 
 func (s *S3Engine) Exists(ctx context.Context, u *URI) (bool, error) {
 	ok, err := s3io.Exists(ctx, u.String(), s.client)
-	return ok, wrapErr(err)
+	return ok, s3Err(err)
 }
 
 func (s *S3Engine) List(ctx context.Context, uri *URI) ([]Info, error) {
@@ -72,7 +72,7 @@ func (s *S3Engine) List(ctx context.Context, uri *URI) ([]Info, error) {
 	return infos, nil
 }
 
-func wrapErr(err error) error {
+func s3Err(err error) error {
 	var reqerr awserr.RequestFailure
 	if errors.As(err, &reqerr) && reqerr.StatusCode() == http.StatusNotFound {
 		return fs.ErrNotExist