diff --git a/src/content/__tests__/schema.test.ts b/src/content/__tests__/schema.test.ts
index 49c7daf..1d2ad19 100644
--- a/src/content/__tests__/schema.test.ts
+++ b/src/content/__tests__/schema.test.ts
@@ -97,3 +97,30 @@ describe('costs and multi-yield', () => {
     expect(content.actionsById.forage.costs).toEqual([]);
   });
 });
+
+describe('unlock conditions', () => {
+  it('accepts optional minResources and requireStoryFlags', () => {
+    const actions = [
+      {
+        id: 'forage',
+        name: 'Forage',
+        durationMs: 3000,
+        yields: [{ resourceId: 'gold', amount: 1 }],
+        unlock: {
+          minResources: { gold: 10 },
+          requireStoryFlags: ['intro_complete'],
+        },
+      },
+    ];
+    const content = buildContent({ resources: validResources, actions });
+    expect(content.actionsById.forage.unlock).toEqual({
+      minResources: { gold: 10 },
+      requireStoryFlags: ['intro_complete'],
+    });
+  });
+
+  it('defaults unlock to undefined when omitted', () => {
+    const content = buildContent({ resources: validResources, actions: validActions });
+    expect(content.actionsById.forage.unlock).toBeUndefined();
+  });
+});
diff --git a/src/content/schema.ts b/src/content/schema.ts
index 2ac353f..5a92d62 100644
--- a/src/content/schema.ts
+++ b/src/content/schema.ts
@@ -20,16 +20,23 @@ export const resourceAmountSchema = z.object({
   amount: z.number().positive(),
 });
 
+export const unlockDefSchema = z.object({
+  minResources: z.record(z.string(), z.number().nonnegative()).optional(),
+  requireStoryFlags: z.array(z.string().min(1)).optional(),
+});
+
 export const actionDefSchema = z.object({
   id: z.string().min(1),
   name: z.string().min(1),
   durationMs: z.number().positive(),
   costs: z.array(resourceAmountSchema).default([]),
   yields: z.array(resourceAmountSchema).min(1),
+  unlock: unlockDefSchema.optional(),
 });
 
 export type ResourceDef = z.infer<typeof resourceDefSchema>;
 export type ResourceAmount = z.infer<typeof resourceAmountSchema>;
+export type UnlockDef = z.infer<typeof unlockDefSchema>;
 export type ActionDef = z.infer<typeof actionDefSchema>;
 
 export interface Content {