diff --git a/lib/openapi.test.ts b/lib/openapi.test.ts
index 1a2c35b..07cc610 100644
--- a/lib/openapi.test.ts
+++ b/lib/openapi.test.ts
@@ -3,8 +3,20 @@ import { describe, expect, it } from 'vitest';
 import { openApiSpec } from './openapi';
 
 describe('OpenAPI spec', () => {
-  it('documents exactly the one public endpoint (scaffold stage)', () => {
-    expect(Object.keys(openApiSpec.paths).sort()).toEqual(['/api/version']);
+  it('documents every public endpoint', () => {
+    expect(Object.keys(openApiSpec.paths).sort()).toEqual(['/api/jump', '/api/version', '/api/world']);
+  });
+
+  it('describes the world endpoints as WorldState in and out', () => {
+    const world = openApiSpec.paths['/api/world'].get.responses[200].content['application/json'].schema;
+    expect(world.$ref).toBe('#/components/schemas/WorldState');
+
+    const jump = openApiSpec.paths['/api/jump'].post;
+    expect(jump.requestBody.content['application/json'].schema.$ref).toBe('#/components/schemas/JumpRequest');
+    expect(jump.responses[200].content['application/json'].schema.$ref).toBe('#/components/schemas/WorldState');
+    for (const status of ['400', '404', '409'] as const) {
+      expect(jump.responses[status].content['application/json'].schema.$ref).toBe('#/components/schemas/Error');
+    }
   });
 
   it('keeps info.version in sync with package.json', () => {