Add uv tool list (#4630)

What it says on the tin.

We skip tools with malformed receipts now and warn instead of failing
all tool operations.

crates/uv-cli/src/lib.rs

@@ -1873,6 +1873,8 @@ pub enum ToolCommand {
     Run(ToolRunArgs),
     /// Install a tool
     Install(ToolInstallArgs),
+    /// List installed tools.
+    List(ToolListArgs),
 }
 
 #[derive(Args)]
@@ -1969,6 +1971,10 @@ pub struct ToolInstallArgs {
     pub python: Option<String>,
 }
 
+#[derive(Args)]
+#[allow(clippy::struct_excessive_bools)]
+pub struct ToolListArgs;
+
 #[derive(Args)]
 #[allow(clippy::struct_excessive_bools)]
 pub struct ToolchainNamespace {

crates/uv-tool/Cargo.toml

@@ -21,6 +21,7 @@ uv-virtualenv = { workspace = true }
 uv-toolchain = { workspace = true }
 install-wheel-rs = { workspace = true }
 pep440_rs = { workspace = true }
+uv-warnings = { workspace = true }
 uv-cache = { workspace = true }
 
 thiserror = { workspace = true }

crates/uv-tool/src/lib.rs

@@ -11,6 +11,7 @@ use tracing::debug;
 use uv_cache::Cache;
 use uv_fs::{LockedFile, Simplified};
 use uv_toolchain::{Interpreter, PythonEnvironment};
+use uv_warnings::warn_user_once;
 
 pub use receipt::ToolReceipt;
 pub use tool::Tool;
@@ -80,9 +81,9 @@ impl InstalledTools {
             let path = directory.join("uv-receipt.toml");
             let contents = match fs_err::read_to_string(&path) {
                 Ok(contents) => contents,
-                // TODO(zanieb): Consider warning on malformed tools instead
                 Err(err) if err.kind() == io::ErrorKind::NotFound => {
-                    return Err(Error::MissingToolReceipt(name.clone(), path.clone()))
+                    warn_user_once!("Ignoring malformed tool `{name}`: missing receipt");
+                    continue;
                 }
                 Err(err) => return Err(err.into()),
             };

crates/uv/src/commands/mod.rs

@@ -25,6 +25,7 @@ pub(crate) use project::sync::sync;
 #[cfg(feature = "self-update")]
 pub(crate) use self_update::self_update;
 pub(crate) use tool::install::install as tool_install;
+pub(crate) use tool::list::list as tool_list;
 pub(crate) use tool::run::run as tool_run;
 pub(crate) use toolchain::find::find as toolchain_find;
 pub(crate) use toolchain::install::install as toolchain_install;

crates/uv/src/commands/tool/list.rs

@@ -0,0 +1,35 @@
+use std::fmt::Write;
+
+use anyhow::Result;
+
+use uv_configuration::PreviewMode;
+use uv_tool::InstalledTools;
+use uv_warnings::warn_user_once;
+
+use crate::commands::ExitStatus;
+use crate::printer::Printer;
+
+/// List installed tools.
+#[allow(clippy::too_many_arguments)]
+pub(crate) async fn list(preview: PreviewMode, printer: Printer) -> Result<ExitStatus> {
+    if preview.is_disabled() {
+        warn_user_once!("`uv tool list` is experimental and may change without warning.");
+    }
+
+    let installed_tools = InstalledTools::from_settings()?;
+
+    let mut tools = installed_tools.tools()?.into_iter().collect::<Vec<_>>();
+    tools.sort_by_key(|(name, _)| name.clone());
+
+    if tools.is_empty() {
+        writeln!(printer.stderr(), "No tools installed")?;
+        return Ok(ExitStatus::Success);
+    }
+
+    // TODO(zanieb): Track and display additional metadata, like entry points
+    for (name, _tool) in tools {
+        writeln!(printer.stdout(), "{name}")?;
+    }
+
+    Ok(ExitStatus::Success)
+}

crates/uv/src/commands/tool/mod.rs

@@ -1,2 +1,3 @@
 pub(crate) mod install;
+pub(crate) mod list;
 pub(crate) mod run;

crates/uv/src/main.rs

@@ -830,6 +830,16 @@ async fn run() -> Result<ExitStatus> {
             )
             .await
         }
+
+        Commands::Tool(ToolNamespace {
+            command: ToolCommand::List(args),
+        }) => {
+            // Resolve the settings from the command-line arguments and workspace configuration.
+            let args = settings::ToolListSettings::resolve(args, filesystem);
+            show_settings!(args);
+
+            commands::tool_list(globals.preview, printer).await
+        }
         Commands::Toolchain(ToolchainNamespace {
             command: ToolchainCommand::List(args),
         }) => {

crates/uv/src/settings.rs

@@ -14,7 +14,8 @@ use uv_cli::{
     AddArgs, ColorChoice, Commands, ExternalCommand, GlobalArgs, ListFormat, LockArgs, Maybe,
     PipCheckArgs, PipCompileArgs, PipFreezeArgs, PipInstallArgs, PipListArgs, PipShowArgs,
     PipSyncArgs, PipTreeArgs, PipUninstallArgs, RemoveArgs, RunArgs, SyncArgs, ToolInstallArgs,
-    ToolRunArgs, ToolchainFindArgs, ToolchainInstallArgs, ToolchainListArgs, VenvArgs,
+    ToolListArgs, ToolRunArgs, ToolchainFindArgs, ToolchainInstallArgs, ToolchainListArgs,
+    VenvArgs,
 };
 use uv_client::Connectivity;
 use uv_configuration::{
@@ -275,6 +276,21 @@ impl ToolInstallSettings {
     }
 }
 
+/// The resolved settings to use for a `tool list` invocation.
+#[allow(clippy::struct_excessive_bools)]
+#[derive(Debug, Clone)]
+pub(crate) struct ToolListSettings;
+
+impl ToolListSettings {
+    /// Resolve the [`ToolListSettings`] from the CLI and filesystem configuration.
+    #[allow(clippy::needless_pass_by_value)]
+    pub(crate) fn resolve(args: ToolListArgs, _filesystem: Option<FilesystemOptions>) -> Self {
+        let ToolListArgs {} = args;
+
+        Self {}
+    }
+}
+
 #[derive(Debug, Clone, Default)]
 pub(crate) enum ToolchainListKinds {
     #[default]

crates/uv/tests/common/mod.rs

@@ -412,6 +412,14 @@ impl TestContext {
         command
     }
 
+    /// Create a `uv tool list` command with options shared across scenarios.
+    pub fn tool_list(&self) -> std::process::Command {
+        let mut command = std::process::Command::new(get_bin());
+        command.arg("tool").arg("list");
+        self.add_shared_args(&mut command);
+        command
+    }
+
     /// Create a `uv add` command for the given requirements.
     pub fn add(&self, reqs: &[&str]) -> Command {
         let mut command = Command::new(get_bin());

crates/uv/tests/tool_list.rs

@@ -0,0 +1,85 @@
+#![cfg(all(feature = "python", feature = "pypi"))]
+
+use assert_cmd::assert::OutputAssertExt;
+use assert_fs::fixture::PathChild;
+use common::{uv_snapshot, TestContext};
+
+mod common;
+
+#[test]
+fn tool_list() {
+    let context = TestContext::new("3.12");
+    let tool_dir = context.temp_dir.child("tools");
+    let bin_dir = context.temp_dir.child("bin");
+
+    // Install `black`
+    context
+        .tool_install()
+        .arg("black==24.2.0")
+        .env("UV_TOOL_DIR", tool_dir.as_os_str())
+        .env("XDG_BIN_HOME", bin_dir.as_os_str())
+        .assert()
+        .success();
+
+    uv_snapshot!(context.filters(), context.tool_list()
+    .env("UV_TOOL_DIR", tool_dir.as_os_str())
+    .env("XDG_BIN_HOME", bin_dir.as_os_str()), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    black
+
+    ----- stderr -----
+    warning: `uv tool list` is experimental and may change without warning.
+    "###);
+}
+
+#[test]
+fn tool_list_empty() {
+    let context = TestContext::new("3.12");
+    let tool_dir = context.temp_dir.child("tools");
+    let bin_dir = context.temp_dir.child("bin");
+
+    uv_snapshot!(context.filters(), context.tool_list()
+    .env("UV_TOOL_DIR", tool_dir.as_os_str())
+    .env("XDG_BIN_HOME", bin_dir.as_os_str()), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    warning: `uv tool list` is experimental and may change without warning.
+    No tools installed
+    "###);
+}
+
+#[test]
+fn tool_list_missing_receipt() {
+    let context = TestContext::new("3.12");
+    let tool_dir = context.temp_dir.child("tools");
+    let bin_dir = context.temp_dir.child("bin");
+
+    // Install `black`
+    context
+        .tool_install()
+        .arg("black==24.2.0")
+        .env("UV_TOOL_DIR", tool_dir.as_os_str())
+        .env("XDG_BIN_HOME", bin_dir.as_os_str())
+        .assert()
+        .success();
+
+    fs_err::remove_file(tool_dir.join("black").join("uv-receipt.toml")).unwrap();
+
+    uv_snapshot!(context.filters(), context.tool_list()
+    .env("UV_TOOL_DIR", tool_dir.as_os_str())
+    .env("XDG_BIN_HOME", bin_dir.as_os_str()), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    warning: `uv tool list` is experimental and may change without warning.
+    warning: Ignoring malformed tool `black`: missing receipt
+    No tools installed
+    "###);
+}