diff --git a/eslint.config.js b/eslint.config.js
index 6419a9fd..57a71453 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -157,7 +157,7 @@ export default tseslint.config(
         },
         {
           type: "backend-shared-utils", // shared backend runtime helpers that modules may import directly
-          pattern: ["server/shared/utils.{js,ts}"], // classify the shared utils file so modules can depend on it explicitly
+          pattern: ["server/shared/utils.{js,ts}", "server/shared/claude-cli-path.ts"], // classify the shared utils file so modules can depend on it explicitly
           mode: "file",
         },
         {
diff --git a/server/claude-sdk.js b/server/claude-sdk.js
index db3a205c..0f1cac97 100644
--- a/server/claude-sdk.js
+++ b/server/claude-sdk.js
@@ -18,6 +18,7 @@ import { promises as fs } from 'fs';
 import path from 'path';
 import os from 'os';
 import { CLAUDE_MODELS } from '../shared/modelConstants.js';
+import { resolveClaudeCodeExecutablePath } from './shared/claude-cli-path.js';
 import {
   createNotificationEvent,
   notifyRunFailed,
@@ -153,11 +154,9 @@ function mapCliOptionsToSDK(options = {}) {
   // Since SDK 0.2.113, options.env replaces process.env instead of overlaying it.
   sdkOptions.env = { ...process.env };
 
-  // Use CLAUDE_CLI_PATH if explicitly set, otherwise fall back to 'claude' on PATH.
-  // The SDK 0.2.113+ looks for a bundled native binary optional dep by default;
-  // this fallback ensures users who installed via the official installer still work
-  // even when npm prune --production has removed those optional deps.
-  sdkOptions.pathToClaudeCodeExecutable = process.env.CLAUDE_CLI_PATH || 'claude';
+  // Resolve the executable eagerly on Windows because the SDK uses raw child_process.spawn,
+  // which does not reliably follow npm's shell wrappers like cross-spawn does.
+  sdkOptions.pathToClaudeCodeExecutable = resolveClaudeCodeExecutablePath(process.env.CLAUDE_CLI_PATH);
 
   // Map working directory
   if (cwd) {
diff --git a/server/modules/providers/list/claude/claude-auth.provider.ts b/server/modules/providers/list/claude/claude-auth.provider.ts
index 1194ae1d..c94fe1b4 100644
--- a/server/modules/providers/list/claude/claude-auth.provider.ts
+++ b/server/modules/providers/list/claude/claude-auth.provider.ts
@@ -4,6 +4,7 @@ import path from 'node:path';
 
 import spawn from 'cross-spawn';
 
+import { resolveClaudeCodeExecutablePath } from '@/shared/claude-cli-path.js';
 import type { IProviderAuth } from '@/shared/interfaces.js';
 import type { ProviderAuthStatus } from '@/shared/types.js';
 import { readObjectRecord, readOptionalString } from '@/shared/utils.js';
@@ -20,13 +21,13 @@ export class ClaudeProviderAuth implements IProviderAuth {
    * Checks whether the Claude Code CLI is available on this host.
    */
   private checkInstalled(): boolean {
-      const cliPath = process.env.CLAUDE_CLI_PATH || 'claude';
-      try {
-        spawn.sync(cliPath, ['--version'], { stdio: 'ignore', timeout: 5000 });
-        return true;
-      } catch {
-        return false;
-      }
+    const cliPath = resolveClaudeCodeExecutablePath(process.env.CLAUDE_CLI_PATH);
+    try {
+      spawn.sync(cliPath, ['--version'], { stdio: 'ignore', timeout: 5000 });
+      return true;
+    } catch {
+      return false;
+    }
   }
 
   /**
diff --git a/server/shared/claude-cli-path.test.ts b/server/shared/claude-cli-path.test.ts
new file mode 100644
index 00000000..87cde218
--- /dev/null
+++ b/server/shared/claude-cli-path.test.ts
@@ -0,0 +1,47 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import {
+  resolveClaudeCodeExecutablePath,
+  type ResolveClaudeCodeExecutablePathDependencies,
+} from '@/shared/claude-cli-path.js';
+
+test('resolveClaudeCodeExecutablePath resolves the npm Claude wrapper to its native exe on Windows', () => {
+  const wrapperDir = 'C:\\nvm4w\\nodejs';
+  const nativePath = `${wrapperDir}\\node_modules\\@anthropic-ai\\claude-code\\bin\\claude.exe`;
+  const execFileSync =
+    (() => `${wrapperDir}\\claude\r\n${wrapperDir}\\claude.cmd\r\n`) as unknown as ResolveClaudeCodeExecutablePathDependencies['execFileSync'];
+  const readFileSync = (() => '') as unknown as ResolveClaudeCodeExecutablePathDependencies['readFileSync'];
+
+  const resolved = resolveClaudeCodeExecutablePath('claude', {
+    platform: 'win32',
+    execFileSync,
+    existsSync: (candidate) => candidate === nativePath,
+    readFileSync,
+  });
+
+  assert.equal(resolved, nativePath);
+});
+
+test('resolveClaudeCodeExecutablePath keeps an explicit JavaScript launcher path unchanged', () => {
+  const scriptPath = 'C:\\tools\\claude.js';
+
+  const resolved = resolveClaudeCodeExecutablePath(scriptPath, {
+    platform: 'win32',
+  });
+
+  assert.equal(resolved, scriptPath);
+});
+
+test('resolveClaudeCodeExecutablePath falls back to the configured command when PATH lookup fails', () => {
+  const execFileSync = (() => {
+    throw new Error('not found');
+  }) as unknown as ResolveClaudeCodeExecutablePathDependencies['execFileSync'];
+
+  const resolved = resolveClaudeCodeExecutablePath('claude', {
+    platform: 'win32',
+    execFileSync,
+  });
+
+  assert.equal(resolved, 'claude');
+});
diff --git a/server/shared/claude-cli-path.ts b/server/shared/claude-cli-path.ts
new file mode 100644
index 00000000..ae8565d5
--- /dev/null
+++ b/server/shared/claude-cli-path.ts
@@ -0,0 +1,139 @@
+import { execFileSync } from 'node:child_process';
+import fs from 'node:fs';
+import path from 'node:path';
+
+const DEFAULT_CLAUDE_COMMAND = 'claude';
+const CLAUDE_SCRIPT_EXTENSIONS = new Set(['.cjs', '.js', '.jsx', '.mjs', '.ts', '.tsx']);
+const CLAUDE_WRAPPER_SEGMENTS = ['node_modules', '@anthropic-ai', 'claude-code', 'bin', 'claude.exe'] as const;
+
+export type ResolveClaudeCodeExecutablePathDependencies = {
+  execFileSync?: typeof execFileSync;
+  existsSync?: typeof fs.existsSync;
+  platform?: NodeJS.Platform;
+  readFileSync?: typeof fs.readFileSync;
+};
+
+function getPathApi(platform: NodeJS.Platform) {
+  return platform === 'win32' ? path.win32 : path;
+}
+
+function stripWrappingQuotes(value: string): string {
+  const trimmed = value.trim();
+  if (
+    (trimmed.startsWith('"') && trimmed.endsWith('"')) ||
+    (trimmed.startsWith("'") && trimmed.endsWith("'"))
+  ) {
+    return trimmed.slice(1, -1);
+  }
+  return trimmed;
+}
+
+function isPathLike(value: string): boolean {
+  return value.includes('/') || value.includes('\\');
+}
+
+function resolveClaudeWrapperBinary(
+  wrapperPath: string,
+  deps: Required<ResolveClaudeCodeExecutablePathDependencies>,
+): string | null {
+  const pathApi = getPathApi(deps.platform);
+  const directCandidate = pathApi.resolve(pathApi.dirname(wrapperPath), ...CLAUDE_WRAPPER_SEGMENTS);
+
+  if (deps.existsSync(directCandidate)) {
+    return directCandidate;
+  }
+
+  let content: string;
+  try {
+    content = deps.readFileSync(wrapperPath, 'utf8');
+  } catch {
+    return null;
+  }
+
+  const matches = content.matchAll(/["']([^"'\\r\\n]*claude\.exe)["']/gi);
+  for (const match of matches) {
+    const rawTarget = match[1]
+      .replace(/^\$basedir[\\/]/i, '')
+      .replace(/^%dp0%[\\/]/i, '')
+      .replace(/^%~dp0[\\/]/i, '');
+    const normalizedTarget = rawTarget.replace(/[\\/]/g, pathApi.sep);
+    const candidate = pathApi.isAbsolute(normalizedTarget)
+      ? normalizedTarget
+      : pathApi.resolve(pathApi.dirname(wrapperPath), normalizedTarget);
+
+    if (deps.existsSync(candidate)) {
+      return candidate;
+    }
+  }
+
+  return null;
+}
+
+function resolveWindowsClaudeExecutablePath(
+  configuredPath: string,
+  deps: Required<ResolveClaudeCodeExecutablePathDependencies>,
+): string {
+  const pathApi = getPathApi(deps.platform);
+  const extension = pathApi.extname(configuredPath).toLowerCase();
+  const explicitPath = isPathLike(configuredPath) || pathApi.isAbsolute(configuredPath);
+
+  if (CLAUDE_SCRIPT_EXTENSIONS.has(extension)) {
+    return configuredPath;
+  }
+
+  if (explicitPath && extension === '.exe') {
+    return configuredPath;
+  }
+
+  if (explicitPath) {
+    return resolveClaudeWrapperBinary(configuredPath, deps) ?? configuredPath;
+  }
+
+  try {
+    const stdout = deps.execFileSync('where.exe', [configuredPath], {
+      encoding: 'utf8',
+      stdio: ['ignore', 'pipe', 'ignore'],
+      windowsHide: true,
+    });
+    const candidates = stdout
+      .split(/\r?\n/)
+      .map((entry) => entry.trim())
+      .filter(Boolean);
+
+    for (const candidate of candidates) {
+      if (pathApi.extname(candidate).toLowerCase() === '.exe') {
+        return candidate;
+      }
+    }
+
+    for (const candidate of candidates) {
+      const resolved = resolveClaudeWrapperBinary(candidate, deps);
+      if (resolved) {
+        return resolved;
+      }
+    }
+  } catch {
+    return configuredPath;
+  }
+
+  return configuredPath;
+}
+
+export function resolveClaudeCodeExecutablePath(
+  configuredPath: string | undefined = process.env.CLAUDE_CLI_PATH,
+  dependencies: ResolveClaudeCodeExecutablePathDependencies = {},
+): string {
+  const deps: Required<ResolveClaudeCodeExecutablePathDependencies> = {
+    execFileSync: dependencies.execFileSync ?? execFileSync,
+    existsSync: dependencies.existsSync ?? fs.existsSync,
+    platform: dependencies.platform ?? process.platform,
+    readFileSync: dependencies.readFileSync ?? fs.readFileSync,
+  };
+
+  const normalizedPath = stripWrappingQuotes(configuredPath || DEFAULT_CLAUDE_COMMAND);
+  if (deps.platform !== 'win32') {
+    return normalizedPath;
+  }
+
+  return resolveWindowsClaudeExecutablePath(normalizedPath, deps);
+}