fix(provider): derive variants from reasoning options (#36543)

packages/core/src/models-dev.ts

@@ -51,6 +51,9 @@ export const Model = Schema.Struct({
   release_date: Schema.String,
   attachment: Schema.Boolean,
   reasoning: Schema.Boolean,
+  // models.dev is external metadata and reasoning controls are expected to evolve.
+  // Provider normalization extracts the subset understood by this client.
+  reasoning_options: Schema.optional(Schema.Unknown),
   temperature: Schema.Boolean,
   tool_call: Schema.Boolean,
   interleaved: Schema.optional(

packages/core/test/models.test.ts

@@ -1,5 +1,5 @@
-import { describe, expect, beforeAll, beforeEach, afterAll } from "bun:test"
-import { Effect, Layer, Ref } from "effect"
+import { describe, expect, beforeAll, beforeEach, afterAll, test } from "bun:test"
+import { Effect, Layer, Ref, Schema } from "effect"
 import { HttpClient, HttpClientResponse } from "effect/unstable/http"
 import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
 import { LayerNodePlatform } from "@opencode-ai/core/effect/app-node-platform"
@@ -126,6 +126,21 @@ const initialState: MockState = {
   calls: [],
 }
 
+test("models.dev model schema keeps reasoning options permissive", () => {
+  const model = Schema.decodeUnknownSync(ModelsDev.Model)({
+    id: "acme-1",
+    name: "Acme One",
+    release_date: "2026-01-01",
+    attachment: false,
+    reasoning: true,
+    reasoning_options: [{ type: "future_control", value: { nested: true } }, "future-shape"],
+    temperature: true,
+    tool_call: true,
+    limit: { context: 128000, output: 8192 },
+  })
+  expect(model.reasoning_options).toEqual([{ type: "future_control", value: { nested: true } }, "future-shape"])
+})
+
 describe("ModelsDev Service", () => {
   it.live("get() returns providers from disk when cache file exists", () =>
     Effect.gen(function* () {