docs: updated config docs and tests

test/config/env.test.js

@@ -26,10 +26,34 @@ afterEach(() => {
 });
 
 describe('loadConfig', () => {
-  it('throws when OPENAI_API_KEY is missing', () => {
+  it('throws when OPENAI_API_KEY is missing and provider is openai', () => {
     delete process.env.OPENAI_API_KEY;
+    delete process.env.CHATGPT_MCP_PROVIDER;
     expect(() => loadConfig()).toThrow(
-      'Configuration error: OPENAI_API_KEY is missing.'
+      'Configuration error: OPENAI_API_KEY is required for the openai provider.'
+    );
+  });
+
+  it('does not throw when OPENAI_API_KEY is missing and provider is manual', () => {
+    delete process.env.OPENAI_API_KEY;
+    setEnv({ CHATGPT_MCP_PROVIDER: 'manual' });
+    const cfg = loadConfig();
+    expect(cfg.chatgptMcpProvider).toBe('manual');
+    expect(cfg.openaiApiKey).toBe(undefined);
+  });
+
+  it('does not throw when OPENAI_API_KEY is missing and provider is ollama', () => {
+    delete process.env.OPENAI_API_KEY;
+    setEnv({ CHATGPT_MCP_PROVIDER: 'ollama' });
+    const cfg = loadConfig();
+    expect(cfg.chatgptMcpProvider).toBe('ollama');
+    expect(cfg.openaiApiKey).toBe(undefined);
+  });
+
+  it('still requires OPENAI_API_KEY for openai even when key is explicitly empty string', () => {
+    setEnv({ CHATGPT_MCP_PROVIDER: 'openai', OPENAI_API_KEY: '' });
+    expect(() => loadConfig()).toThrow(
+      'Configuration error: OPENAI_API_KEY is required for the openai provider.'
     );
   });