diff --git a/src/csv-loader/tests/parseCsv-typeDeclarations.test.ts b/src/csv-loader/tests/parseCsv-typeDeclarations.test.ts
index b2ed968..4070eb9 100644
--- a/src/csv-loader/tests/parseCsv-typeDeclarations.test.ts
+++ b/src/csv-loader/tests/parseCsv-typeDeclarations.test.ts
@@ -201,6 +201,54 @@ describe("parseCsv - type declarations", () => {
     // Column should use the declared type name, not expanded union
     expect(result.typeDefinition).toContain("readonly trigger: Trigger;");
   });
+
+  it("should expand custom type names inside tuples and arrays", () => {
+    const csv = [
+      "# type IntentEffectTarget = 'user' | 'eachEnemy' | 'randomEnemy' | 'player'",
+      "# type IntentEffect = [IntentEffectTarget; string; int]",
+      "# type IntentEffects = IntentEffect[]",
+      "id,effects",
+      "string,IntentEffects",
+      "boost,[user;spike;1];[user;defend;4]",
+    ].join("\n");
+
+    const result = parseCsv(csv, { emitTypes: false });
+
+    expect(result.typeDeclarations).toHaveLength(3);
+    const intentEffect = result.typeDeclarations.find(
+      (d) => d.name === "IntentEffect",
+    )!;
+    expect(intentEffect.schema.type).toBe("tuple");
+    // First element should be resolved to union, not a string "IntentEffectTarget"
+    const firstEl = (
+      intentEffect.schema as { elements: { schema: { type: string } }[] }
+    ).elements[0].schema;
+    expect(firstEl.type).toBe("union");
+  });
+
+  it("should use declared type names in generated type definition for tuple arrays", () => {
+    const csv = [
+      "# type IntentEffectTarget = 'user' | 'eachEnemy' | 'randomEnemy' | 'player'",
+      "# type IntentEffect = [IntentEffectTarget; string; int]",
+      "# type IntentEffects = IntentEffect[]",
+      "id,effects",
+      "string,IntentEffects",
+      "boost,[user;spike;1];[user;defend;4]",
+    ].join("\n");
+
+    const result = parseCsv(csv, {
+      emitTypes: true,
+      resourceName: "intent",
+      currentFilePath: path.join(fixturesDir, "intent.csv"),
+    });
+
+    expect(result.typeDefinition).toContain("type IntentEffectTarget =");
+    expect(result.typeDefinition).toContain("type IntentEffect =");
+    expect(result.typeDefinition).toContain("type IntentEffects =");
+
+    // Column should reference IntentEffects, not inline expansion
+    expect(result.typeDefinition).toContain("readonly effects: IntentEffects;");
+  });
 });
 
 describe("parseCsv - type declarations with resolveReferences: false", () => {