fix(core): Improve shell tool reliability and test portability (#1036)

packages/core/src/config/config.ts

@@ -174,8 +174,8 @@ export class Config {
       setGeminiMdFilename(params.contextFileName);
     }
 
-    this.toolRegistry = createToolRegistry(this);
     this.geminiClient = new GeminiClient(this);
+    this.toolRegistry = createToolRegistry(this);
 
     if (this.telemetrySettings.enabled) {
       initializeTelemetry(this);

packages/core/src/core/prompts.test.ts

@@ -7,6 +7,7 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
 import { getCoreSystemPrompt } from './prompts.js'; // Adjust import path
 import * as process from 'node:process';
+import * as os from 'node:os';
 import { isGitRepository } from '../utils/gitUtils.js';
 
 // Mock tool names if they are dynamically generated or complex
@@ -24,6 +25,9 @@ vi.mock('../tools/shell', () => ({
 vi.mock('../tools/write-file', () => ({
   WriteFileTool: { Name: 'write_file' },
 }));
+vi.mock('node:os', () => ({
+  platform: vi.fn(),
+}));
 vi.mock('../utils/gitUtils', () => ({
   isGitRepository: vi.fn(),
 }));
@@ -35,6 +39,7 @@ describe('Core System Prompt (prompts.ts)', () => {
   beforeEach(() => {
     // Store original value before each test
     originalSandboxEnv = process.env.SANDBOX;
+    vi.mocked(os.platform).mockReturnValue('darwin');
   });
 
   afterEach(() => {

packages/core/src/tools/shell.ts

@@ -170,17 +170,16 @@ export class ShellTool extends BaseTool<ShellToolParams, ToolResult> {
     }
 
     const isWindows = os.platform() === 'win32';
+    const tempFileName = `shell_pgrep_${crypto
+      .randomBytes(6)
+      .toString('hex')}.tmp`;
+    const tempFilePath = path.join(os.tmpdir(), tempFileName);
 
     // pgrep is not available on Windows, so we can't get background PIDs
     const command = isWindows
       ? params.command
       : (() => {
           // wrap command to append subprocess pids (via pgrep) to temporary file
-          const tempFileName = `shell_pgrep_${crypto
-            .randomBytes(6)
-            .toString('hex')}.tmp`;
-          const tempFilePath = path.join(os.tmpdir(), tempFileName);
-
           let command = params.command.trim();
           if (!command.endsWith('&')) command += ';';
           return `{ ${command} }; __code=$?; pgrep -g 0 >${tempFilePath} 2>&1; exit $__code;`;
@@ -293,10 +292,6 @@ export class ShellTool extends BaseTool<ShellToolParams, ToolResult> {
     // parse pids (pgrep output) from temporary file and remove it
     const backgroundPIDs: number[] = [];
     if (os.platform() !== 'win32') {
-      const tempFileName = `shell_pgrep_${crypto
-        .randomBytes(6)
-        .toString('hex')}.tmp`;
-      const tempFilePath = path.join(os.tmpdir(), tempFileName);
       if (fs.existsSync(tempFilePath)) {
         const pgrepLines = fs
           .readFileSync(tempFilePath, 'utf8')