diff --git a/packages/cli-json-cas/src/cli.test.ts b/packages/cli-json-cas/src/cli.test.ts
index 7537b9d..9497564 100644
--- a/packages/cli-json-cas/src/cli.test.ts
+++ b/packages/cli-json-cas/src/cli.test.ts
@@ -224,6 +224,39 @@ describe("@ Alias Resolution - put", () => {
     expect(exitCode).not.toBe(0);
     expect(stderr.length).toBeGreaterThan(0);
   });
+
+  test("ucas put @schema with nested type constraints should succeed", async () => {
+    await runCliAlias("init");
+
+    const schemaFile = join(testDir, "constrained-schema.json");
+    writeFileSync(
+      schemaFile,
+      JSON.stringify({
+        type: "object",
+        properties: {
+          name: { type: "string", minLength: 1, maxLength: 50 },
+          age: { type: "number", minimum: 0, maximum: 150 },
+          tags: {
+            type: "array",
+            items: { type: "string" },
+            minItems: 1,
+            uniqueItems: true,
+          },
+        },
+        required: ["name"],
+      }),
+    );
+
+    const { stdout, stderr, exitCode } = await runCliAlias(
+      "put",
+      "@schema",
+      schemaFile,
+    );
+
+    expect(exitCode).toBe(0);
+    expect(stderr).toBe("");
+    expect(envValue(stdout)).toMatch(/^[0-9A-HJKMNP-TV-Z]{13}$/);
+  });
 });
 
 describe("@ Alias Resolution - hash", () => {
diff --git a/packages/cli-json-cas/src/index.ts b/packages/cli-json-cas/src/index.ts
index 1c55fd4..f09abd6 100644
--- a/packages/cli-json-cas/src/index.ts
+++ b/packages/cli-json-cas/src/index.ts
@@ -13,6 +13,7 @@ import {
   getSchema,
   InvalidTagFormatError,
   InvalidVariableNameError,
+  putSchema,
   refs,
   renderAsync,
   renderDirect,
@@ -187,6 +188,23 @@ async function cmdPut(args: string[]): Promise<void> {
   const payload = readJsonFile(file);
   const store = await openStore();
 
+  // Schema nodes: use putSchema() which validates via isValidSchema() (recursive)
+  // instead of ajv against meta-schema (which can't express recursive constraints)
+  const builtinSchemas = await bootstrap(store);
+  const metaHash = builtinSchemas["@schema"];
+  if (typeHash === metaHash) {
+    try {
+      const hash = await putSchema(store, payload as Record<string, unknown>);
+      out(await wrapEnvelope(store, "@output/put", hash));
+    } catch (e) {
+      console.error(
+        `Validation failed: payload in ${file} does not match schema ${typeHash}`,
+      );
+      process.exit(1);
+    }
+    return;
+  }
+
   // Check if schema exists
   const schema = getSchema(store, typeHash);
   if (schema === null) {