diff --git a/src/main/managers/OpenWebUIManager.ts b/src/main/managers/OpenWebUIManager.ts
index 2d28812..2a5138e 100644
--- a/src/main/managers/OpenWebUIManager.ts
+++ b/src/main/managers/OpenWebUIManager.ts
@@ -1,6 +1,8 @@
 import { spawn } from 'child_process';
 import type { ChildProcess } from 'child_process';
 import { join } from 'path';
+import { homedir } from 'os';
+import { access } from 'fs/promises';
 
 import { LogManager } from './LogManager';
 import { WindowManager } from './WindowManager';
@@ -53,6 +55,26 @@ export class OpenWebUIManager {
   > {
     const env = { ...process.env };
 
+    const uvPaths = [
+      join(homedir(), '.cargo', 'bin'),
+      join(homedir(), '.local', 'bin'),
+    ];
+
+    const existingPaths: string[] = [];
+    for (const path of uvPaths) {
+      try {
+        await access(path);
+        existingPaths.push(path);
+      } catch {
+        void 0;
+      }
+    }
+
+    if (existingPaths.length > 0) {
+      const pathSeparator = process.platform === 'win32' ? ';' : ':';
+      env.PATH = `${existingPaths.join(pathSeparator)}${pathSeparator}${env.PATH}`;
+    }
+
     if (process.platform === 'win32') {
       env.PYTHONIOENCODING = 'utf-8';
       env.PYTHONLEGACYWINDOWSSTDIO = '1';
@@ -66,11 +88,7 @@ export class OpenWebUIManager {
   async isUvAvailable(): Promise<boolean> {
     try {
       const env = await this.getUvEnvironment();
-      const testProcess = spawn('uv', ['--version'], {
-        stdio: 'pipe',
-        env,
-        shell: true,
-      });
+      const testProcess = spawn('uv', ['--version'], { stdio: 'pipe', env });
 
       return new Promise<boolean>((resolve) => {
         const timeout = setTimeout(() => {
@@ -109,7 +127,6 @@ export class OpenWebUIManager {
       stdio: ['pipe', 'pipe', 'pipe'],
       detached: false,
       env: mergedEnv,
-      shell: true,
     });
   }
 
@@ -118,24 +135,14 @@ export class OpenWebUIManager {
 
     return new Promise((resolve, reject) => {
       const checkForOutput = (data: Buffer) => {
-        try {
-          const output = data.toString('utf8');
-          if (output.includes(SERVER_READY_SIGNALS.OPENWEBUI)) {
-            this.windowManager.sendKoboldOutput('Open WebUI is now running!');
-            resolve();
+        const output = data.toString();
+        if (output.includes(SERVER_READY_SIGNALS.OPENWEBUI)) {
+          this.windowManager.sendKoboldOutput('Open WebUI is now running!');
+          resolve();
 
-            if (this.openWebUIProcess?.stdout) {
-              this.openWebUIProcess.stdout.removeListener(
-                'data',
-                checkForOutput
-              );
-            }
+          if (this.openWebUIProcess?.stdout) {
+            this.openWebUIProcess.stdout.removeListener('data', checkForOutput);
           }
-        } catch (error) {
-          this.logManager.logError(
-            'Error checking OpenWebUI output:',
-            error as Error
-          );
         }
       };
 
diff --git a/src/main/managers/SillyTavernManager.ts b/src/main/managers/SillyTavernManager.ts
index c9b2e63..39b2bf8 100644
--- a/src/main/managers/SillyTavernManager.ts
+++ b/src/main/managers/SillyTavernManager.ts
@@ -2,6 +2,7 @@ import { spawn } from 'child_process';
 import { createServer, request, type Server } from 'http';
 import { homedir } from 'os';
 import { join } from 'path';
+import { access, readdir } from 'fs/promises';
 import type { ChildProcess } from 'child_process';
 
 import { LogManager } from './LogManager';
@@ -86,12 +87,94 @@ export class SillyTavernManager {
     return join(dataRoot, 'default-user', 'settings.json');
   }
 
+  private async tryAddPathToEnv(
+    env: Record<string, string | undefined>,
+    path: string
+  ): Promise<boolean> {
+    const pathSeparator = process.platform === 'win32' ? ';' : ':';
+    if (!env.PATH?.includes(path)) {
+      env.PATH = `${path}${pathSeparator}${env.PATH}`;
+      return true;
+    }
+    return false;
+  }
+
+  private async tryVersionManagerPath(
+    basePath: string,
+    env: Record<string, string | undefined>
+  ): Promise<boolean> {
+    try {
+      await access(basePath);
+      const versions = await readdir(basePath);
+      if (versions.length > 0) {
+        const latestVersion = versions.sort().pop();
+        if (latestVersion) {
+          const binSubPath = basePath.includes('fnm')
+            ? join('installation', 'bin')
+            : 'bin';
+          const nodeBinPath = join(basePath, latestVersion, binSubPath);
+
+          try {
+            await access(nodeBinPath);
+            return this.tryAddPathToEnv(env, nodeBinPath);
+          } catch {
+            return false;
+          }
+        }
+      }
+    } catch {
+      return false;
+    }
+    return false;
+  }
+
+  private async getNodeEnvironment(): Promise<
+    Record<string, string | undefined>
+  > {
+    const env = { ...process.env };
+
+    const versionManagerPaths = [
+      join(homedir(), '.local', 'share', 'fnm', 'node-versions'),
+      join(homedir(), '.nvm', 'versions', 'node'),
+      join(homedir(), '.volta', 'tools', 'image', 'node'),
+      join(homedir(), '.asdf', 'installs', 'nodejs'),
+    ];
+
+    const systemPaths: string[] = [];
+    if (process.platform === 'darwin') {
+      systemPaths.push('/opt/homebrew/bin', '/usr/local/bin');
+    }
+    if (process.platform === 'win32') {
+      versionManagerPaths.push(
+        join(homedir(), 'AppData', 'Local', 'fnm', 'node-versions'),
+        join(homedir(), 'AppData', 'Roaming', 'nvm')
+      );
+    }
+
+    for (const systemPath of systemPaths) {
+      try {
+        await access(systemPath);
+        if (await this.tryAddPathToEnv(env, systemPath)) {
+          return env;
+        }
+      } catch {
+        continue;
+      }
+    }
+
+    for (const versionPath of versionManagerPaths) {
+      if (await this.tryVersionManagerPath(versionPath, env)) {
+        return env;
+      }
+    }
+
+    return env;
+  }
+
   async isNpxAvailable(): Promise<boolean> {
     try {
-      const testProcess = spawn('npx', ['--version'], {
-        stdio: 'pipe',
-        shell: true,
-      });
+      const env = await this.getNodeEnvironment();
+      const testProcess = spawn('npx', ['--version'], { stdio: 'pipe', env });
 
       return new Promise<boolean>((resolve) => {
         const timeout = setTimeout(() => {
@@ -115,10 +198,11 @@ export class SillyTavernManager {
   }
 
   private async createNpxProcess(args: string[]): Promise<ChildProcess> {
+    const env = await this.getNodeEnvironment();
     return spawn('npx', args, {
       stdio: ['pipe', 'pipe', 'pipe'],
       detached: false,
-      shell: true,
+      env,
     });
   }