Add --no-workspace in lieu of --isolated

crates/uv-cli/src/lib.rs

@@ -1843,6 +1843,11 @@ pub struct InitArgs {
     #[arg(long)]
     pub no_readme: bool,
 
+    /// Avoid discovering the workspace in the current directory or any parent directory. Instead,
+    /// create a standalone project.
+    #[arg(long)]
+    pub no_workspace: bool,
+
     /// The Python interpreter to use to determine the minimum supported Python version.
     ///
     /// By default, uv uses the virtual environment in the current working directory or any parent
@@ -1916,9 +1921,14 @@ pub struct RunArgs {
     pub refresh: RefreshArgs,
 
     /// Run the command in a specific package in the workspace.
-    #[arg(long, conflicts_with = "isolated")]
+    #[arg(long)]
     pub package: Option<PackageName>,
 
+    /// Avoid discovering the project or workspace in the current directory or any parent directory.
+    /// Instead, run in an isolated, ephemeral environment populated by the `--with` requirements.
+    #[arg(long, conflicts_with = "package", alias = "no_project")]
+    pub no_workspace: bool,
+
     /// The Python interpreter to use to build the run environment.
     ///
     /// By default, uv uses the virtual environment in the current working directory or any parent

crates/uv/src/commands/project/init.rs

@@ -31,7 +31,7 @@ pub(crate) async fn init(
     r#virtual: bool,
     no_readme: bool,
     python: Option<String>,
-    isolated: bool,
+    no_workspace: bool,
     preview: PreviewMode,
     python_preference: PythonPreference,
     python_fetch: PythonFetch,
@@ -76,14 +76,14 @@ pub(crate) async fn init(
     };
 
     if r#virtual {
-        init_virtual_workspace(&path, isolated)?;
+        init_virtual_workspace(&path, no_workspace)?;
     } else {
         init_project(
             &path,
             &name,
             no_readme,
             python,
-            isolated,
+            no_workspace,
             python_preference,
             python_fetch,
             connectivity,
@@ -133,9 +133,9 @@ pub(crate) async fn init(
 }
 
 /// Initialize a virtual workspace at the given path.
-fn init_virtual_workspace(path: &Path, isolated: bool) -> Result<()> {
+fn init_virtual_workspace(path: &Path, no_workspace: bool) -> Result<()> {
     // Ensure that we aren't creating a nested workspace.
-    if !isolated {
+    if !no_workspace {
         check_nested_workspaces(path, &DiscoveryOptions::default());
     }
 
@@ -157,7 +157,7 @@ async fn init_project(
     name: &PackageName,
     no_readme: bool,
     python: Option<String>,
-    isolated: bool,
+    no_workspace: bool,
     python_preference: PythonPreference,
     python_fetch: PythonFetch,
     connectivity: Connectivity,
@@ -166,7 +166,7 @@ async fn init_project(
     printer: Printer,
 ) -> Result<()> {
     // Discover the current workspace, if it exists.
-    let workspace = if isolated {
+    let workspace = if no_workspace {
         None
     } else {
         // Attempt to find a workspace root.

crates/uv/src/commands/project/run.rs

@@ -45,7 +45,7 @@ pub(crate) async fn run(
     dev: bool,
     python: Option<String>,
     settings: ResolverInstallerSettings,
-    isolated: bool,
+    no_workspace: bool,
     preview: PreviewMode,
     python_preference: PythonPreference,
     python_fetch: PythonFetch,
@@ -159,8 +159,8 @@ pub(crate) async fn run(
     // Discover and sync the base environment.
     let base_interpreter = if let Some(script_interpreter) = script_interpreter {
         Some(script_interpreter)
-    } else if isolated {
-        // package is `None`, isolated and package are marked as conflicting in clap.
+    } else if no_workspace {
+        // package is `None` (`no_workspace` and `package` are marked as conflicting in Clap).
         None
     } else {
         let project = if let Some(package) = package {

crates/uv/src/lib.rs

@@ -875,7 +875,7 @@ async fn run_project(
                 args.r#virtual,
                 args.no_readme,
                 args.python,
-                globals.isolated,
+                args.no_workspace || globals.isolated,
                 globals.preview,
                 globals.python_preference,
                 globals.python_fetch,
@@ -917,7 +917,7 @@ async fn run_project(
                 args.dev,
                 args.python,
                 args.settings,
-                globals.isolated,
+                args.no_workspace || globals.isolated,
                 globals.preview,
                 globals.python_preference,
                 globals.python_fetch,

crates/uv/src/settings.rs

@@ -155,6 +155,7 @@ pub(crate) struct InitSettings {
     pub(crate) name: Option<PackageName>,
     pub(crate) r#virtual: bool,
     pub(crate) no_readme: bool,
+    pub(crate) no_workspace: bool,
     pub(crate) python: Option<String>,
 }
 
@@ -167,6 +168,7 @@ impl InitSettings {
             name,
             r#virtual,
             no_readme,
+            no_workspace,
             python,
         } = args;
 
@@ -175,6 +177,7 @@ impl InitSettings {
             name,
             r#virtual,
             no_readme,
+            no_workspace,
             python,
         }
     }
@@ -192,6 +195,7 @@ pub(crate) struct RunSettings {
     pub(crate) with: Vec<String>,
     pub(crate) with_requirements: Vec<PathBuf>,
     pub(crate) package: Option<PackageName>,
+    pub(crate) no_workspace: bool,
     pub(crate) python: Option<String>,
     pub(crate) refresh: Refresh,
     pub(crate) settings: ResolverInstallerSettings,
@@ -216,6 +220,7 @@ impl RunSettings {
             build,
             refresh,
             package,
+            no_workspace,
             python,
         } = args;
 
@@ -234,6 +239,7 @@ impl RunSettings {
                 .filter_map(Maybe::into_option)
                 .collect(),
             package,
+            no_workspace,
             python,
             refresh: Refresh::from(refresh),
             settings: ResolverInstallerSettings::combine(

crates/uv/tests/init.rs

@@ -558,7 +558,7 @@ fn init_invalid_names() -> Result<()> {
 }
 
 #[test]
-fn init_workspace_isolated() -> Result<()> {
+fn init_isolated() -> Result<()> {
     let context = TestContext::new("3.12");
 
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
@@ -602,6 +602,51 @@ fn init_workspace_isolated() -> Result<()> {
     Ok(())
 }
 
+#[test]
+fn init_no_workspace() -> Result<()> {
+    let context = TestContext::new("3.12");
+
+    let pyproject_toml = context.temp_dir.child("pyproject.toml");
+    pyproject_toml.write_str(indoc! {
+        r#"
+        [project]
+        name = "project"
+        version = "0.1.0"
+        requires-python = ">=3.12"
+        "#,
+    })?;
+
+    let child = context.temp_dir.join("foo");
+    fs_err::create_dir(&child)?;
+
+    uv_snapshot!(context.filters(), context.init().current_dir(&child).arg("--no-workspace"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    warning: `uv init` is experimental and may change without warning
+    Initialized project `foo`
+    "###);
+
+    let workspace = fs_err::read_to_string(context.temp_dir.join("pyproject.toml"))?;
+
+    insta::with_settings!({
+        filters => context.filters(),
+    }, {
+        assert_snapshot!(
+            workspace, @r###"
+        [project]
+        name = "project"
+        version = "0.1.0"
+        requires-python = ">=3.12"
+        "###
+        );
+    });
+
+    Ok(())
+}
+
 #[test]
 fn init_project_inside_project() -> Result<()> {
     let context = TestContext::new("3.12");