diff --git a/sdk/typescript/eslint.config.js b/sdk/typescript/eslint.config.js
index c2fb27d2df..accb022be1 100644
--- a/sdk/typescript/eslint.config.js
+++ b/sdk/typescript/eslint.config.js
@@ -1,8 +1,5 @@
-import eslint from '@eslint/js';
-import { defineConfig } from 'eslint/config';
-import tseslint from 'typescript-eslint';
+import eslint from "@eslint/js";
+import { defineConfig } from "eslint/config";
+import tseslint from "typescript-eslint";
 
-export default defineConfig(
-  eslint.configs.recommended,
-  tseslint.configs.recommended,
-);
+export default defineConfig(eslint.configs.recommended, tseslint.configs.recommended);
diff --git a/sdk/typescript/src/codex.ts b/sdk/typescript/src/codex.ts
index bb4b713550..331b7e6e3f 100644
--- a/sdk/typescript/src/codex.ts
+++ b/sdk/typescript/src/codex.ts
@@ -6,7 +6,7 @@ export class Codex {
   private exec: CodexExec;
   private options: CodexOptions;
 
-  constructor(options: CodexOptions) {
+  constructor(options: CodexOptions = {}) {
     this.exec = new CodexExec(options.codexPathOverride);
     this.options = options;
   }
diff --git a/sdk/typescript/src/codexOptions.ts b/sdk/typescript/src/codexOptions.ts
index 2d22bcf227..149e61717a 100644
--- a/sdk/typescript/src/codexOptions.ts
+++ b/sdk/typescript/src/codexOptions.ts
@@ -2,4 +2,5 @@ export type CodexOptions = {
   codexPathOverride?: string;
   baseUrl?: string;
   apiKey?: string;
+  workingDirectory?: string;
 };
diff --git a/sdk/typescript/src/exec.ts b/sdk/typescript/src/exec.ts
index 6ae5b441a7..d11c2a1646 100644
--- a/sdk/typescript/src/exec.ts
+++ b/sdk/typescript/src/exec.ts
@@ -12,8 +12,14 @@ export type CodexExecArgs = {
   baseUrl?: string;
   apiKey?: string;
   threadId?: string | null;
+  // --model
   model?: string;
+  // --sandbox
   sandboxMode?: SandboxMode;
+  // --cd
+  workingDirectory?: string;
+  // --skip-git-repo-check
+  skipGitRepoCheck?: boolean;
 };
 
 export class CodexExec {
@@ -33,12 +39,18 @@ export class CodexExec {
       commandArgs.push("--sandbox", args.sandboxMode);
     }
 
-    if (args.threadId) {
-      commandArgs.push("resume", args.threadId, args.input);
-    } else {
-      commandArgs.push(args.input);
+    if (args.workingDirectory) {
+      commandArgs.push("--cd", args.workingDirectory);
+    }
+
+    if (args.skipGitRepoCheck) {
+      commandArgs.push("--skip-git-repo-check");
     }
 
+    if (args.threadId) {
+      commandArgs.push("resume", args.threadId);
+    } 
+
     const env = {
       ...process.env,
     };
@@ -55,11 +67,25 @@ export class CodexExec {
 
     let spawnError: unknown | null = null;
     child.once("error", (err) => (spawnError = err));
+    
+    if (!child.stdin) {
+      child.kill();
+      throw new Error("Child process has no stdin");
+    }
+    child.stdin.write(args.input);
+    child.stdin.end();
 
     if (!child.stdout) {
       child.kill();
       throw new Error("Child process has no stdout");
     }
+    const stderrChunks: Buffer[] = [];
+
+    if (child.stderr) {
+      child.stderr.on("data", (data) => {
+        stderrChunks.push(data);
+      });
+    }
 
     const rl = readline.createInterface({
       input: child.stdout,
@@ -72,12 +98,13 @@ export class CodexExec {
         yield line as string;
       }
 
-      const exitCode = new Promise((resolve) => {
-        child.once("exit", (code) => { 
+      const exitCode = new Promise((resolve, reject) => {
+        child.once("exit", (code) => {
           if (code === 0) {
             resolve(code);
           } else {
-            throw new Error(`Codex Exec exited with code ${code}`);
+            const stderrBuffer = Buffer.concat(stderrChunks);
+            reject(new Error(`Codex Exec exited with code ${code}: ${stderrBuffer.toString('utf8')}`));
           }
         });
       });
diff --git a/sdk/typescript/src/thread.ts b/sdk/typescript/src/thread.ts
index 3e380e0aea..de2c2c94dc 100644
--- a/sdk/typescript/src/thread.ts
+++ b/sdk/typescript/src/thread.ts
@@ -41,6 +41,8 @@ export class Thread {
       threadId: this.id,
       model: options?.model,
       sandboxMode: options?.sandboxMode,
+      workingDirectory: options?.workingDirectory,
+      skipGitRepoCheck: options?.skipGitRepoCheck,
     });
     for await (const item of generator) {
       const parsed = JSON.parse(item) as ThreadEvent;
diff --git a/sdk/typescript/src/turnOptions.ts b/sdk/typescript/src/turnOptions.ts
index c414334d19..ce56d7b2c6 100644
--- a/sdk/typescript/src/turnOptions.ts
+++ b/sdk/typescript/src/turnOptions.ts
@@ -5,4 +5,6 @@ export type SandboxMode = "read-only" | "workspace-write" | "danger-full-access"
 export type TurnOptions = {
   model?: string;
   sandboxMode?: SandboxMode;
+  workingDirectory?: string;
+  skipGitRepoCheck?: boolean;
 };
diff --git a/sdk/typescript/tests/codexExecSpy.ts b/sdk/typescript/tests/codexExecSpy.ts
index 9028b6e6e5..daf8123cb7 100644
--- a/sdk/typescript/tests/codexExecSpy.ts
+++ b/sdk/typescript/tests/codexExecSpy.ts
@@ -9,8 +9,7 @@ const actualChildProcess = jest.requireActual<typeof import("child_process")>("c
 const spawnMock = child_process.spawn as jest.MockedFunction<typeof actualChildProcess.spawn>;
 
 export function codexExecSpy(): { args: string[][]; restore: () => void } {
-  const previousImplementation =
-    spawnMock.getMockImplementation() ?? actualChildProcess.spawn;
+  const previousImplementation = spawnMock.getMockImplementation() ?? actualChildProcess.spawn;
   const args: string[][] = [];
 
   spawnMock.mockImplementation(((...spawnArgs: Parameters<typeof child_process.spawn>) => {
diff --git a/sdk/typescript/tests/run.test.ts b/sdk/typescript/tests/run.test.ts
index 8c7dff7725..7c243b8e79 100644
--- a/sdk/typescript/tests/run.test.ts
+++ b/sdk/typescript/tests/run.test.ts
@@ -1,3 +1,5 @@
+import fs from "fs";
+import os from "os";
 import path from "path";
 
 import { codexExecSpy } from "./codexExecSpy";
@@ -211,14 +213,79 @@ describe("Codex", () => {
 
       expectPair(commandArgs, ["--sandbox", "workspace-write"]);
       expectPair(commandArgs, ["--model", "gpt-test-1"]);
-  
     } finally {
       restore();
       await close();
     }
   });
-});
 
+  it("runs in provided working directory", async () => {
+    const { url, close } = await startResponsesTestProxy({
+      statusCode: 200,
+      responseBodies: [
+        sse(
+          responseStarted("response_1"),
+          assistantMessage("Working directory applied", "item_1"),
+          responseCompleted("response_1"),
+        ),
+      ],
+    });
+
+    const { args: spawnArgs, restore } = codexExecSpy();
+
+    try {
+      const workingDirectory = fs.mkdtempSync(path.join(os.tmpdir(), "codex-working-dir-"));
+      const client = new Codex({
+        codexPathOverride: codexExecPath,
+        baseUrl: url,
+        apiKey: "test",
+      });
+
+      const thread = client.startThread();
+      await thread.run("use custom working directory", {
+        workingDirectory,
+        skipGitRepoCheck: true,
+      });
+
+      const commandArgs = spawnArgs[0];
+      expectPair(commandArgs, ["--cd", workingDirectory]);
+    } finally {
+      restore();
+      await close();
+    }
+  });
+
+  it("throws if working directory is not git and no skipGitRepoCheck is provided", async () => {
+    const { url, close } = await startResponsesTestProxy({
+      statusCode: 200,
+      responseBodies: [
+        sse(
+          responseStarted("response_1"),
+          assistantMessage("Working directory applied", "item_1"),
+          responseCompleted("response_1"),
+        ),
+      ],
+    });
+
+    try {
+      const workingDirectory = fs.mkdtempSync(path.join(os.tmpdir(), "codex-working-dir-"));
+      const client = new Codex({
+        codexPathOverride: codexExecPath,
+        baseUrl: url,
+        apiKey: "test",
+      });
+
+      const thread = client.startThread();
+      await expect(
+        thread.run("use custom working directory", {
+          workingDirectory,
+        }),
+      ).rejects.toThrow(/Not inside a trusted directory/);
+    } finally {
+      await close();
+    }
+  });
+});
 
 function expectPair(args: string[] | undefined, pair: [string, string]) {
   if (!args) {