Make API key optional — fall back to local Codex CLI auth

Author: Monkatraz

codegen-llm/src/cli.ts

@@ -80,7 +80,7 @@ program
         rawOpts.apiKey ||
         process.env.OPENAI_API_KEY ||
         process.env.CODEX_API_KEY ||
-        "",
+        undefined,
       verbose: rawOpts.verbose,
     };
 

codegen-llm/src/codegen.ts

@@ -41,7 +41,7 @@ export async function runCodegen(opts: CodegenOptions): Promise<void> {
     // -----------------------------------------------------------------------
     // 3. Start Codex session
     // -----------------------------------------------------------------------
-    const codex = new Codex({ apiKey: opts.apiKey });
+    const codex = new Codex(opts.apiKey ? { apiKey: opts.apiKey } : {});
 
     // The agent gets its own workspace as the working directory, with
     // additional read access to the server source (and existing client if
@@ -132,9 +132,12 @@ export async function runCodegen(opts: CodegenOptions): Promise<void> {
 // ---------------------------------------------------------------------------
 
 function validatePrerequisites(opts: CodegenOptions): void {
+  // API key is optional — if omitted the Codex CLI will use its locally
+  // stored session (from `codex` → "Sign in with ChatGPT").
   if (!opts.apiKey) {
-    throw new Error(
-      "API key required. Set OPENAI_API_KEY / CODEX_API_KEY or use --api-key.",
+    log(
+      opts,
+      "No API key provided; relying on local Codex CLI authentication.",
     );
   }
 

codegen-llm/src/types.ts

@@ -15,8 +15,8 @@ export interface CodegenOptions {
   effort: "low" | "medium" | "high" | "xhigh";
   /** Maximum number of generation + verification attempts */
   maxAttempts: number;
-  /** OpenAI API key */
-  apiKey: string;
+  /** OpenAI API key (optional — if omitted, uses local Codex CLI auth) */
+  apiKey?: string;
   /** Print verbose output */
   verbose: boolean;
 }