refactor(notebook): remove tool availability checks

apps/notebook/src/App.tsx

@@ -182,7 +182,6 @@ function AppContent() {
   // UV Dependency management
   const {
     dependencies,
-    uvAvailable,
     hasDependencies: hasUvDependencies,
     isUvConfigured,
     loading: depsLoading,
@@ -222,12 +221,8 @@ function AppContent() {
   } = useCondaDependencies();
 
   // Deno config detection and settings
-  const {
-    denoAvailable,
-    denoConfigInfo,
-    flexibleNpmImports,
-    setFlexibleNpmImports,
-  } = useDenoDependencies();
+  const { denoConfigInfo, flexibleNpmImports, setFlexibleNpmImports } =
+    useDenoDependencies();
 
   // Get widget store handler for routing comm messages
   const { handleMessage: handleWidgetMessage } = useWidgetStoreRequired();
@@ -316,11 +311,9 @@ function AppContent() {
     ? "conda"
     : envSource?.startsWith("uv:")
       ? "uv"
-      : isUvConfigured && uvAvailable !== false
+      : isUvConfigured
         ? "uv"
-        : isCondaConfigured ||
-            environmentYmlInfo?.has_dependencies ||
-            uvAvailable === false
+        : isCondaConfigured || environmentYmlInfo?.has_dependencies
           ? "conda"
           : null;
 
@@ -1068,7 +1061,6 @@ function AppContent() {
           )}
         {dependencyHeaderOpen && runtime === "deno" && (
           <DenoDependencyHeader
-            denoAvailable={denoAvailable}
             denoConfigInfo={denoConfigInfo}
             flexibleNpmImports={flexibleNpmImports}
             onSetFlexibleNpmImports={setFlexibleNpmImports}
@@ -1111,7 +1103,6 @@ function AppContent() {
               dependencies={dependencies?.dependencies ?? []}
               requiresPython={dependencies?.requires_python ?? null}
               prerelease={dependencies?.prerelease ?? null}
-              uvAvailable={uvAvailable}
               loading={depsLoading}
               syncedWhileRunning={syncedWhileRunning}
               needsKernelRestart={needsKernelRestart}

apps/notebook/src/components/DenoDependencyHeader.tsx

@@ -11,7 +11,6 @@ import { Label } from "@/components/ui/label";
 import type { DenoConfigInfo } from "../hooks/useDenoDependencies";
 
 interface DenoDependencyHeaderProps {
-  denoAvailable: boolean | null;
   denoConfigInfo: DenoConfigInfo | null;
   flexibleNpmImports: boolean;
   onSetFlexibleNpmImports: (enabled: boolean) => void;
@@ -24,7 +23,6 @@ interface DenoDependencyHeaderProps {
 }
 
 export function DenoDependencyHeader({
-  denoAvailable,
   denoConfigInfo,
   flexibleNpmImports,
   onSetFlexibleNpmImports,
@@ -73,16 +71,6 @@ export function DenoDependencyHeader({
           </div>
         )}
 
-        {/* Deno availability notice */}
-        {denoAvailable === false && (
-          <div className="mb-3 rounded bg-amber-500/10 px-2 py-1.5 text-xs text-amber-700 dark:text-amber-400">
-            <span className="font-medium">Deno not found.</span> Install it with{" "}
-            <code className="rounded bg-amber-500/20 px-1">
-              curl -fsSL https://deno.land/install.sh | sh
-            </code>
-          </div>
-        )}
-
         {/* deno.json detected banner */}
         {denoConfigInfo && (
           <div className="mb-3 rounded bg-muted/80 px-2 py-1.5 text-xs text-muted-foreground">
@@ -116,7 +104,7 @@ export function DenoDependencyHeader({
         )}
 
         {/* No config file - explain how Deno handles deps */}
-        {!denoConfigInfo && denoAvailable !== false && (
+        {!denoConfigInfo && (
           <div className="mb-3 flex items-start gap-2 rounded bg-muted/50 px-2 py-1.5 text-xs text-muted-foreground">
             <Info className="h-3.5 w-3.5 mt-0.5 shrink-0" />
             <span>
@@ -127,30 +115,28 @@ export function DenoDependencyHeader({
         )}
 
         {/* Auto-install npm packages setting */}
-        {denoAvailable !== false && (
-          <div className="mb-3 flex items-start gap-2.5">
-            <Checkbox
-              id="flexible-npm-imports"
-              checked={flexibleNpmImports}
-              onCheckedChange={(checked) =>
-                onSetFlexibleNpmImports(checked === true)
-              }
-              className="mt-0.5"
-            />
-            <Label
-              htmlFor="flexible-npm-imports"
-              className="flex-1 flex-col items-start gap-1 cursor-pointer"
-            >
-              <span className="text-xs font-medium text-foreground">
-                Auto-install npm packages
-              </span>
-              <p className="text-xs text-muted-foreground font-normal">
-                Packages download automatically when you import them. Disable to
-                use your project&apos;s node_modules instead.
-              </p>
-            </Label>
-          </div>
-        )}
+        <div className="mb-3 flex items-start gap-2.5">
+          <Checkbox
+            id="flexible-npm-imports"
+            checked={flexibleNpmImports}
+            onCheckedChange={(checked) =>
+              onSetFlexibleNpmImports(checked === true)
+            }
+            className="mt-0.5"
+          />
+          <Label
+            htmlFor="flexible-npm-imports"
+            className="flex-1 flex-col items-start gap-1 cursor-pointer"
+          >
+            <span className="text-xs font-medium text-foreground">
+              Auto-install npm packages
+            </span>
+            <p className="text-xs text-muted-foreground font-normal">
+              Packages download automatically when you import them. Disable to
+              use your project&apos;s node_modules instead.
+            </p>
+          </Label>
+        </div>
 
         {/* Import examples */}
         <div className="space-y-2">

apps/notebook/src/components/DependencyHeader.tsx

@@ -18,7 +18,6 @@ interface DependencyHeaderProps {
   dependencies: string[];
   requiresPython: string | null;
   prerelease: string | null;
-  uvAvailable: boolean | null;
   loading: boolean;
   syncedWhileRunning: boolean;
   needsKernelRestart: boolean;
@@ -45,7 +44,6 @@ export function DependencyHeader({
   dependencies,
   requiresPython,
   prerelease,
-  uvAvailable,
   loading,
   syncedWhileRunning,
   needsKernelRestart,
@@ -163,19 +161,6 @@ export function DependencyHeader({
           </div>
         )}
 
-        {/* UV availability notice */}
-        {uvAvailable === false && (
-          <div className="mb-3 flex items-start gap-2 rounded bg-muted/80 px-2 py-1.5 text-xs text-muted-foreground">
-            <Info className="h-3.5 w-3.5 mt-0.5 shrink-0" />
-            <span>
-              <span className="font-medium">uv not found.</span> Install it with{" "}
-              <code className="rounded bg-muted px-1">
-                curl -LsSf https://astral.sh/uv/install.sh | sh
-              </code>
-            </span>
-          </div>
-        )}
-
         {/* pyproject.toml detected banner */}
         {pyprojectInfo?.has_dependencies && (
           <div className="mb-3 rounded bg-muted/80 px-2 py-1.5 text-xs text-muted-foreground">

apps/notebook/src/hooks/useDenoDependencies.ts

@@ -1,5 +1,6 @@
 import { invoke } from "@tauri-apps/api/core";
 import { useCallback, useEffect, useState } from "react";
+
 import { logger } from "../lib/logger";
 import {
   setDenoFlexibleNpmImports as setDenoFlexibleWasm,
@@ -15,7 +16,6 @@ export interface DenoConfigInfo {
 }
 
 export function useDenoDependencies() {
-  const [denoAvailable, setDenoAvailable] = useState<boolean | null>(null);
   const [denoConfigInfo, setDenoConfigInfo] = useState<DenoConfigInfo | null>(
     null,
   );
@@ -24,9 +24,8 @@ export function useDenoDependencies() {
   const flexibleNpmImportsFromDoc = useDenoFlexibleNpmImports();
   const flexibleNpmImports = flexibleNpmImportsFromDoc ?? true;
 
-  // Check Deno availability and detect config on mount
+  // Detect deno config on mount
   useEffect(() => {
-    invoke<boolean>("check_deno_available").then(setDenoAvailable);
     invoke<DenoConfigInfo | null>("detect_deno_config").then(setDenoConfigInfo);
   }, []);
 
@@ -39,7 +38,6 @@ export function useDenoDependencies() {
   }, []);
 
   return {
-    denoAvailable,
     denoConfigInfo,
     flexibleNpmImports,
     setFlexibleNpmImports,

apps/notebook/src/hooks/useDependencies.ts

@@ -47,7 +47,6 @@ export interface PyProjectInfo {
 }
 
 export function useDependencies() {
-  const [uvAvailable, setUvAvailable] = useState<boolean | null>(null);
   const [loading, setLoading] = useState(false);
   // Track if deps were synced to a running kernel (user may need to restart for some changes)
   const [syncedWhileRunning, setSyncedWhileRunning] = useState(false);
@@ -72,9 +71,8 @@ export function useDependencies() {
     setSyncState(null);
   }, []);
 
-  // Check if uv is available and detect pyproject on mount
+  // Detect pyproject on mount
   useEffect(() => {
-    invoke<boolean>("check_uv_available").then(setUvAvailable);
     invoke<PyProjectInfo | null>("detect_pyproject").then(setPyprojectInfo);
   }, []);
 
@@ -261,7 +259,6 @@ export function useDependencies() {
 
   return {
     dependencies,
-    uvAvailable,
     hasDependencies,
     isUvConfigured,
     loading,

crates/notebook/Cargo.toml

@@ -36,7 +36,6 @@ runtimed = { path = "../runtimed" }
 notebook-sync = { path = "../notebook-sync" }
 runt-trust = { path = "../runt-trust" }
 runt-workspace = { path = "../runt-workspace" }
-kernel-env = { path = "../kernel-env" }
 nbformat = "1.2.1"
 petname = "2"
 log = "0.4"

crates/notebook/src/lib.rs

@@ -2402,12 +2402,6 @@ async fn send_frame(
 // UV Dependency Management Commands
 // ============================================================================
 
-/// Check if uv is available on the system.
-#[tauri::command]
-async fn check_uv_available() -> bool {
-    uv_env::check_uv_available().await
-}
-
 // ============================================================================
 // pyproject.toml Discovery and Environment Commands
 // ============================================================================
@@ -2778,32 +2772,6 @@ async fn import_pixi_dependencies(
 
 // ========== Deno kernel support ==========
 
-/// Check if Deno is available on the system.
-/// Queries the daemon via the notebook sync protocol so the notebook crate
-/// does not need a direct dependency on kernel-launch.
-#[tauri::command]
-async fn check_deno_available(
-    window: tauri::Window,
-    registry: tauri::State<'_, WindowNotebookRegistry>,
-) -> Result<bool, String> {
-    let Ok(notebook_sync) = notebook_sync_for_window(&window, registry.inner()) else {
-        return Ok(false);
-    };
-    let guard = notebook_sync.lock().await;
-    let Some(handle) = guard.as_ref() else {
-        return Ok(false);
-    };
-    match handle
-        .send_request(NotebookRequest::CheckToolAvailable {
-            tool: "deno".to_string(),
-        })
-        .await
-    {
-        Ok(NotebookResponse::ToolAvailable { available }) => Ok(available),
-        _ => Ok(false),
-    }
-}
-
 /// Detect deno.json/deno.jsonc near the notebook and return info about it
 #[tauri::command]
 async fn detect_deno_config(
@@ -3453,8 +3421,6 @@ pub fn run(
             get_upgrade_notebook_status,
             abort_kernel_for_upgrade,
             run_upgrade,
-            // UV dependency management
-            check_uv_available,
             // pyproject.toml discovery
             detect_pyproject,
             get_pyproject_dependencies,
@@ -3470,7 +3436,6 @@ pub fn run(
             approve_notebook_trust,
             check_typosquats,
             // Deno kernel support
-            check_deno_available,
             detect_deno_config,
             // Synced settings (via runtimed Automerge)
             get_synced_settings,

crates/notebook/src/uv_env.rs

@@ -1,8 +1,8 @@
 //! UV-based notebook metadata operations.
 //!
 //! This module provides notebook-specific metadata operations (set
-//! dependencies in `nbformat::Metadata`) and a thin availability check.
-//! Environment creation is handled entirely by the daemon via `kernel_env::uv`.
+//! dependencies in `nbformat::Metadata`). Environment creation and tool
+//! availability checks are handled entirely by the daemon.
 
 use serde::{Deserialize, Serialize};
 
@@ -36,8 +36,3 @@ pub fn set_dependencies(metadata: &mut nbformat::v4::Metadata, deps: &NotebookDe
         runt_obj.insert("uv".to_string(), uv_value);
     }
 }
-
-/// Check if uv is available (either on PATH or bootstrappable via rattler).
-pub async fn check_uv_available() -> bool {
-    kernel_env::uv::check_uv_available().await
-}