fix(capabilities): 兼容 Kimi 的严格工具 Schema 校验

extensions/capabilities/index.test.ts

@@ -148,6 +148,15 @@ test("the gateway does not add an ineffective resident adoption guideline", () =
   assert.equal(h.tool().promptGuidelines, undefined);
 });
 
+test("the gateway exposes a provider-portable string enum for capability groups", () => {
+  const parameters = JSON.parse(JSON.stringify(harness().tool().parameters));
+
+  assert.deepEqual(parameters.properties.groups.items, {
+    type: "string",
+    enum: ["search", "delegate", "workflow", "background", "session"],
+  });
+});
+
 test("the gateway stays within its compact provider-surface budget", () => {
   const tool = harness().tool();
   const serialized = JSON.stringify({

extensions/capabilities/index.ts

@@ -17,7 +17,10 @@ import {
   resetOpenPiToolSurface,
 } from "../shared/tool-surface.ts";
 
-const CapabilitySchema = Type.Enum(OPENPI_CAPABILITY_NAMES);
+const CapabilitySchema = Type.Unsafe<OpenPiCapability>({
+  type: "string",
+  enum: OPENPI_CAPABILITY_NAMES,
+});
 
 const OpenPiLoadToolsParameters = Type.Object({
   groups: Type.Optional(