diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index fc8a910aa7d..7da8879a734 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -49,7 +49,7 @@ jobs:
           shared-key: "shared"
       - name: Check and report Clippy errors
         run: |
-          python ./x.py clippy -- -D warnings
+          python ./x.py clippy-all
 
   # Detect missing dependencies in workspace packages
   # See: https://stackoverflow.com/a/74293494/2491528
diff --git a/x.py b/x.py
index 8dc7ed8c063..951db082581 100755
--- a/x.py
+++ b/x.py
@@ -34,48 +34,9 @@
 
 dry_run = False
 
-RUSTFMT_CRATES = [
-    'analysis',
-    'jni-gen',
-    'prusti',
-    'prusti-common',
-    'prusti-contracts/prusti-contracts',
-    'prusti-contracts/prusti-contracts-proc-macros',
-    'prusti-contracts/prusti-specs',
-    'prusti-contracts/prusti-std',
-    'prusti-contracts-build',
-    'prusti-interface',
-    'prusti-launch',
-    'prusti-rustc-interface',
-    'prusti-server',
-    'prusti-smt-solver',
-    'prusti-tests',
-    'prusti-utils',
-    #'prusti-viper',
-    'smt-log-analyzer',
-    #'test-crates',
-    'viper',
-    'viper-sys',
-    'vir',
-    'vir-gen',
-]
-
-RUSTFMT_PATHS = [
-    'prusti-common/src/report/mod.rs',
-    'prusti-common/src/utils/mod.rs',
-    'prusti-common/src/vir/to_viper.rs',
-    'prusti-common/src/vir/low_to_viper/mod.rs',
-    'prusti-common/src/vir/optimizations/mod.rs',
-    'prusti-viper/src/encoder/foldunfold/mod.rs',
-    'prusti-viper/src/encoder/mir/mod.rs',
-    'prusti-viper/src/encoder/high/mod.rs',
-    'prusti-viper/src/encoder/typed/mod.rs',
-    'prusti-viper/src/encoder/middle/mod.rs',
-    'prusti-viper/src/encoder/snapshot/mod.rs',
-    'prusti-viper/src/encoder/lifetimes/mod.rs',
-    'prusti-viper/src/encoder/definition_collector.rs',
-    'prusti-viper/src/encoder/counterexamples/mod.rs',
-    'vir/defs/mod.rs',
+PRUSTI_WORKSPACES = [
+    '.',
+    'prusti-contracts',
 ]
 
 
@@ -208,33 +169,23 @@ def run_viper_server(port=None):
     run_command(command)
 
 
-def clippy_in(cwd):
-    """Run cargo clippy in given subproject."""
-    run_command(['cargo', 'clippy', '--', '-D', 'warnings'], cwd=cwd)
+def clippy_all():
+    """Run clippy in all workspaces."""
+    for workspace_path in PRUSTI_WORKSPACES:
+        run_command(['cargo', 'clippy', '--', '-D', 'warnings'], cwd=workspace_path)
 
-def fmt_in(cwd):
-    """Run cargo fmt in given subproject."""
-    run_command(['cargo', 'fmt'], cwd=cwd)
 
 def fmt_all():
-    """Run rustfmt on all formatted files."""
-    for crate in RUSTFMT_CRATES:
-        fmt_in(crate)
-    for path in RUSTFMT_PATHS:
-        for file in glob.glob(path, recursive=True):
-            run_command(['rustfmt', file])
+    """Run rustfmt in all workspaces."""
+    for workspace_path in PRUSTI_WORKSPACES:
+        run_command(['cargo', 'fmt', '--all'], cwd=workspace_path)
 
-def fmt_check_in(cwd):
-    """Run cargo fmt check in the given subproject."""
-    run_command(['cargo', 'fmt', '--', '--check'], cwd=cwd)
 
 def fmt_check_all():
-    """Run rustfmt check on all formatted files."""
-    for crate in RUSTFMT_CRATES:
-        fmt_check_in(crate)
-    for path in RUSTFMT_PATHS:
-        for file in glob.glob(path, recursive=True):
-            run_command(['rustfmt', '--check', file])
+    """Run rustfmt check in all workspaces."""
+    for workspace_path in PRUSTI_WORKSPACES:
+        run_command(['cargo', 'fmt', '--all', '--', '--check'], cwd=workspace_path)
+
 
 def check_smir():
     """Check that `extern crate` is used only in `prusti_rustc_interface` (TODO: `prusti_interface` is also ignored for now)."""
@@ -258,6 +209,7 @@ def check_smir():
                 )
             )
 
+
 def package(mode: str, package_path: str):
     """Packages Prusti artifacts in the `package_path` folder.
 
@@ -359,6 +311,11 @@ def test_package(package_path: str):
 
 def main(argv):
     logging.basicConfig(format='%(levelname)s: %(message)s', level=logging.DEBUG)
+
+    # Check the working directory, because this script uses a lot of relative paths.
+    if os.path.abspath(os.getcwd()) != os.path.abspath(os.path.dirname(__file__)):
+        error(f'Please run this script from the root folder of the repository.')
+
     for i, arg in enumerate(argv):
         if arg.startswith('+'):
             if arg == '+v' or arg == '++verbose':
@@ -385,30 +342,30 @@ def main(argv):
         elif arg == 'exec':
             run_command(argv[i+1:])
             break
-        elif arg == 'clippy-in':
-            clippy_in(*argv[i+1:])
-            break
-        elif arg == 'fmt-check':
-            fmt_check_in(*argv[i+1:])
+        # Run `cargo clippy --all` in all workspaces.
+        elif arg == 'clippy-all':
+            clippy_all()
             break
+        # Check `cargo fmt --all` in all workspaces.
         elif arg == 'fmt-check-all':
-            fmt_check_all(*argv[i+1:])
-            break
-        elif arg == 'fmt':
-            fmt_in(*argv[i+1:])
-            break
-        elif arg == 'fmt-all':
-            fmt_all(*argv[i+1:])
+            fmt_check_all()
             break
         elif arg == 'check-smir':
             check_smir(*argv[i+1:])
             break
+        # Run `cargo fmt --all` in all workspaces.
+        elif arg == 'fmt-all':
+            fmt_all()
+            break
+        # Packages Prusti artifacts in the given folder.
         elif arg == 'package':
             package(*argv[i+1:])
             break
+        # Quickly test that a Prusti release has been packaged correctly in the given folder.
         elif arg == 'test-package':
             test_package(*argv[i+1:])
             break
+        # Run whatever is left as a cargo command.
         else:
             cargo(argv[i:])
             break