diff --git a/package.json b/package.json
index 68098ad8..4aee6527 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "type": "module",
   "scripts": {
     "dev": "node scripts/dev-runner.mjs watch",
-    "dev:watch": "PAPERCLIP_MIGRATION_PROMPT=never node scripts/dev-runner.mjs watch",
+    "dev:watch": "cross-env PAPERCLIP_MIGRATION_PROMPT=never node scripts/dev-runner.mjs watch",
     "dev:once": "node scripts/dev-runner.mjs dev",
     "dev:server": "pnpm --filter @paperclipai/server dev",
     "dev:ui": "pnpm --filter @paperclipai/ui dev",
@@ -34,6 +34,7 @@
   },
   "devDependencies": {
     "@changesets/cli": "^2.30.0",
+    "cross-env": "^10.1.0",
     "@playwright/test": "^1.58.2",
     "esbuild": "^0.27.3",
     "typescript": "^5.7.3",
diff --git a/packages/adapter-utils/src/server-utils.ts b/packages/adapter-utils/src/server-utils.ts
index 76efba86..3d273cd9 100644
--- a/packages/adapter-utils/src/server-utils.ts
+++ b/packages/adapter-utils/src/server-utils.ts
@@ -15,6 +15,11 @@ interface RunningProcess {
   graceSec: number;
 }
 
+interface SpawnTarget {
+  command: string;
+  args: string[];
+}
+
 type ChildProcessWithEvents = ChildProcess & {
   on(event: "error", listener: (err: Error) => void): ChildProcess;
   on(
@@ -125,6 +130,78 @@ export function defaultPathForPlatform() {
   return "/usr/local/bin:/opt/homebrew/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin";
 }
 
+function windowsPathExts(env: NodeJS.ProcessEnv): string[] {
+  return (env.PATHEXT ?? ".EXE;.CMD;.BAT;.COM").split(";").filter(Boolean);
+}
+
+async function pathExists(candidate: string) {
+  try {
+    await fs.access(candidate, process.platform === "win32" ? fsConstants.F_OK : fsConstants.X_OK);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+async function resolveCommandPath(command: string, cwd: string, env: NodeJS.ProcessEnv): Promise<string | null> {
+  const hasPathSeparator = command.includes("/") || command.includes("\\");
+  if (hasPathSeparator) {
+    const absolute = path.isAbsolute(command) ? command : path.resolve(cwd, command);
+    return (await pathExists(absolute)) ? absolute : null;
+  }
+
+  const pathValue = env.PATH ?? env.Path ?? "";
+  const delimiter = process.platform === "win32" ? ";" : ":";
+  const dirs = pathValue.split(delimiter).filter(Boolean);
+  const exts = process.platform === "win32" ? windowsPathExts(env) : [""];
+  const hasExtension = process.platform === "win32" && path.extname(command).length > 0;
+
+  for (const dir of dirs) {
+    const candidates =
+      process.platform === "win32"
+        ? hasExtension
+          ? [path.join(dir, command)]
+          : exts.map((ext) => path.join(dir, `${command}${ext}`))
+        : [path.join(dir, command)];
+    for (const candidate of candidates) {
+      if (await pathExists(candidate)) return candidate;
+    }
+  }
+
+  return null;
+}
+
+function quoteForCmd(arg: string) {
+  if (!arg.length) return '""';
+  const escaped = arg.replace(/"/g, '""');
+  return /[\s"&<>|^()]/.test(escaped) ? `"${escaped}"` : escaped;
+}
+
+async function resolveSpawnTarget(
+  command: string,
+  args: string[],
+  cwd: string,
+  env: NodeJS.ProcessEnv,
+): Promise<SpawnTarget> {
+  const resolved = await resolveCommandPath(command, cwd, env);
+  const executable = resolved ?? command;
+
+  if (process.platform !== "win32") {
+    return { command: executable, args };
+  }
+
+  if (/\.(cmd|bat)$/i.test(executable)) {
+    const shell = env.ComSpec || process.env.ComSpec || "cmd.exe";
+    const commandLine = [quoteForCmd(executable), ...args.map(quoteForCmd)].join(" ");
+    return {
+      command: shell,
+      args: ["/d", "/s", "/c", commandLine],
+    };
+  }
+
+  return { command: executable, args };
+}
+
 export function ensurePathInEnv(env: NodeJS.ProcessEnv): NodeJS.ProcessEnv {
   if (typeof env.PATH === "string" && env.PATH.length > 0) return env;
   if (typeof env.Path === "string" && env.Path.length > 0) return env;
@@ -169,36 +246,12 @@ export async function ensureAbsoluteDirectory(
 }
 
 export async function ensureCommandResolvable(command: string, cwd: string, env: NodeJS.ProcessEnv) {
-  const hasPathSeparator = command.includes("/") || command.includes("\\");
-  if (hasPathSeparator) {
+  const resolved = await resolveCommandPath(command, cwd, env);
+  if (resolved) return;
+  if (command.includes("/") || command.includes("\\")) {
     const absolute = path.isAbsolute(command) ? command : path.resolve(cwd, command);
-    try {
-      await fs.access(absolute, fsConstants.X_OK);
-    } catch {
-      throw new Error(`Command is not executable: "${command}" (resolved: "${absolute}")`);
-    }
-    return;
+    throw new Error(`Command is not executable: "${command}" (resolved: "${absolute}")`);
   }
-
-  const pathValue = env.PATH ?? env.Path ?? "";
-  const delimiter = process.platform === "win32" ? ";" : ":";
-  const dirs = pathValue.split(delimiter).filter(Boolean);
-  const windowsExt = process.platform === "win32"
-    ? (env.PATHEXT ?? ".EXE;.CMD;.BAT;.COM").split(";")
-    : [""];
-
-  for (const dir of dirs) {
-    for (const ext of windowsExt) {
-      const candidate = path.join(dir, process.platform === "win32" ? `${command}${ext}` : command);
-      try {
-        await fs.access(candidate, fsConstants.X_OK);
-        return;
-      } catch {
-        // continue scanning PATH
-      }
-    }
-  }
-
   throw new Error(`Command not found in PATH: "${command}"`);
 }
 
@@ -220,78 +273,82 @@ export async function runChildProcess(
 
   return new Promise<RunProcessResult>((resolve, reject) => {
     const mergedEnv = ensurePathInEnv({ ...process.env, ...opts.env });
-    const child = spawn(command, args, {
-      cwd: opts.cwd,
-      env: mergedEnv,
-      shell: false,
-      stdio: [opts.stdin != null ? "pipe" : "ignore", "pipe", "pipe"],
-    }) as ChildProcessWithEvents;
+    void resolveSpawnTarget(command, args, opts.cwd, mergedEnv)
+      .then((target) => {
+        const child = spawn(target.command, target.args, {
+          cwd: opts.cwd,
+          env: mergedEnv,
+          shell: false,
+          stdio: [opts.stdin != null ? "pipe" : "ignore", "pipe", "pipe"],
+        }) as ChildProcessWithEvents;
 
-    if (opts.stdin != null && child.stdin) {
-      child.stdin.write(opts.stdin);
-      child.stdin.end();
-    }
+        if (opts.stdin != null && child.stdin) {
+          child.stdin.write(opts.stdin);
+          child.stdin.end();
+        }
 
-    runningProcesses.set(runId, { child, graceSec: opts.graceSec });
+        runningProcesses.set(runId, { child, graceSec: opts.graceSec });
 
-    let timedOut = false;
-    let stdout = "";
-    let stderr = "";
-    let logChain: Promise<void> = Promise.resolve();
+        let timedOut = false;
+        let stdout = "";
+        let stderr = "";
+        let logChain: Promise<void> = Promise.resolve();
 
-    const timeout =
-      opts.timeoutSec > 0
-        ? setTimeout(() => {
-            timedOut = true;
-            child.kill("SIGTERM");
-            setTimeout(() => {
-              if (!child.killed) {
-                child.kill("SIGKILL");
-              }
-            }, Math.max(1, opts.graceSec) * 1000);
-          }, opts.timeoutSec * 1000)
-        : null;
+        const timeout =
+          opts.timeoutSec > 0
+            ? setTimeout(() => {
+                timedOut = true;
+                child.kill("SIGTERM");
+                setTimeout(() => {
+                  if (!child.killed) {
+                    child.kill("SIGKILL");
+                  }
+                }, Math.max(1, opts.graceSec) * 1000);
+              }, opts.timeoutSec * 1000)
+            : null;
 
-    child.stdout?.on("data", (chunk: unknown) => {
-      const text = String(chunk);
-      stdout = appendWithCap(stdout, text);
-      logChain = logChain
-        .then(() => opts.onLog("stdout", text))
-        .catch((err) => onLogError(err, runId, "failed to append stdout log chunk"));
-    });
-
-    child.stderr?.on("data", (chunk: unknown) => {
-      const text = String(chunk);
-      stderr = appendWithCap(stderr, text);
-      logChain = logChain
-        .then(() => opts.onLog("stderr", text))
-        .catch((err) => onLogError(err, runId, "failed to append stderr log chunk"));
-    });
-
-    child.on("error", (err: Error) => {
-      if (timeout) clearTimeout(timeout);
-      runningProcesses.delete(runId);
-      const errno = (err as NodeJS.ErrnoException).code;
-      const pathValue = mergedEnv.PATH ?? mergedEnv.Path ?? "";
-      const msg =
-        errno === "ENOENT"
-          ? `Failed to start command "${command}" in "${opts.cwd}". Verify adapter command, working directory, and PATH (${pathValue}).`
-          : `Failed to start command "${command}" in "${opts.cwd}": ${err.message}`;
-      reject(new Error(msg));
-    });
-
-    child.on("close", (code: number | null, signal: NodeJS.Signals | null) => {
-      if (timeout) clearTimeout(timeout);
-      runningProcesses.delete(runId);
-      void logChain.finally(() => {
-        resolve({
-          exitCode: code,
-          signal,
-          timedOut,
-          stdout,
-          stderr,
+        child.stdout?.on("data", (chunk: unknown) => {
+          const text = String(chunk);
+          stdout = appendWithCap(stdout, text);
+          logChain = logChain
+            .then(() => opts.onLog("stdout", text))
+            .catch((err) => onLogError(err, runId, "failed to append stdout log chunk"));
         });
-      });
-    });
+
+        child.stderr?.on("data", (chunk: unknown) => {
+          const text = String(chunk);
+          stderr = appendWithCap(stderr, text);
+          logChain = logChain
+            .then(() => opts.onLog("stderr", text))
+            .catch((err) => onLogError(err, runId, "failed to append stderr log chunk"));
+        });
+
+        child.on("error", (err: Error) => {
+          if (timeout) clearTimeout(timeout);
+          runningProcesses.delete(runId);
+          const errno = (err as NodeJS.ErrnoException).code;
+          const pathValue = mergedEnv.PATH ?? mergedEnv.Path ?? "";
+          const msg =
+            errno === "ENOENT"
+              ? `Failed to start command "${command}" in "${opts.cwd}". Verify adapter command, working directory, and PATH (${pathValue}).`
+              : `Failed to start command "${command}" in "${opts.cwd}": ${err.message}`;
+          reject(new Error(msg));
+        });
+
+        child.on("close", (code: number | null, signal: NodeJS.Signals | null) => {
+          if (timeout) clearTimeout(timeout);
+          runningProcesses.delete(runId);
+          void logChain.finally(() => {
+            resolve({
+              exitCode: code,
+              signal,
+              timedOut,
+              stdout,
+              stderr,
+            });
+          });
+        });
+      })
+      .catch(reject);
   });
 }
diff --git a/server/package.json b/server/package.json
index 5c37c211..8c442e25 100644
--- a/server/package.json
+++ b/server/package.json
@@ -23,7 +23,7 @@
   ],
   "scripts": {
     "dev": "tsx src/index.ts",
-    "dev:watch": "PAPERCLIP_MIGRATION_PROMPT=never tsx watch --ignore ../ui/node_modules --ignore ../ui/.vite --ignore ../ui/dist src/index.ts",
+    "dev:watch": "cross-env PAPERCLIP_MIGRATION_PROMPT=never tsx watch --ignore ../ui/node_modules --ignore ../ui/.vite --ignore ../ui/dist src/index.ts",
     "prepare:ui-dist": "bash ../scripts/prepare-server-ui-dist.sh",
     "build": "tsc",
     "prepack": "pnpm run prepare:ui-dist",
@@ -64,6 +64,7 @@
     "@types/node": "^24.6.0",
     "@types/supertest": "^6.0.2",
     "@types/ws": "^8.18.1",
+    "cross-env": "^10.1.0",
     "supertest": "^7.0.0",
     "tsx": "^4.19.2",
     "typescript": "^5.7.3",
diff --git a/server/src/__tests__/codex-local-adapter-environment.test.ts b/server/src/__tests__/codex-local-adapter-environment.test.ts
index 9814334d..a9201c98 100644
--- a/server/src/__tests__/codex-local-adapter-environment.test.ts
+++ b/server/src/__tests__/codex-local-adapter-environment.test.ts
@@ -4,6 +4,8 @@ import os from "node:os";
 import path from "node:path";
 import { testEnvironment } from "@paperclipai/adapter-codex-local/server";
 
+const itWindows = process.platform === "win32" ? it : it.skip;
+
 describe("codex_local environment diagnostics", () => {
   it("creates a missing working directory when cwd is absolute", async () => {
     const cwd = path.join(
@@ -29,4 +31,45 @@ describe("codex_local environment diagnostics", () => {
     expect(stats.isDirectory()).toBe(true);
     await fs.rm(path.dirname(cwd), { recursive: true, force: true });
   });
+
+  itWindows("runs the hello probe when Codex is available via a Windows .cmd wrapper", async () => {
+    const root = path.join(
+      os.tmpdir(),
+      `paperclip-codex-local-probe-${Date.now()}-${Math.random().toString(16).slice(2)}`,
+    );
+    const binDir = path.join(root, "bin");
+    const cwd = path.join(root, "workspace");
+    const fakeCodex = path.join(binDir, "codex.cmd");
+    const script = [
+      "@echo off",
+      "echo {\"type\":\"thread.started\",\"thread_id\":\"test-thread\"}",
+      "echo {\"type\":\"item.completed\",\"item\":{\"type\":\"agent_message\",\"text\":\"hello\"}}",
+      "echo {\"type\":\"turn.completed\",\"usage\":{\"input_tokens\":1,\"cached_input_tokens\":0,\"output_tokens\":1}}",
+      "exit /b 0",
+      "",
+    ].join("\r\n");
+
+    try {
+      await fs.mkdir(binDir, { recursive: true });
+      await fs.writeFile(fakeCodex, script, "utf8");
+
+      const result = await testEnvironment({
+        companyId: "company-1",
+        adapterType: "codex_local",
+        config: {
+          command: "codex",
+          cwd,
+          env: {
+            OPENAI_API_KEY: "test-key",
+            PATH: `${binDir}${path.delimiter}${process.env.PATH ?? ""}`,
+          },
+        },
+      });
+
+      expect(result.status).toBe("pass");
+      expect(result.checks.some((check) => check.code === "codex_hello_probe_passed")).toBe(true);
+    } finally {
+      await fs.rm(root, { recursive: true, force: true });
+    }
+  });
 });