fix(provider): restore model suggestions (#27372)

packages/opencode/test/provider/provider.test.ts

@@ -19,6 +19,7 @@ import { testEffect } from "../lib/effect"
 
 const env = makeRuntime(Env.Service, Env.defaultLayer)
 const set = (k: string, v: string) => env.runSync((svc) => svc.set(k, v))
+const remove = (k: string) => env.runSync((svc) => svc.remove(k))
 
 async function run<A, E>(fn: (provider: Provider.Interface) => Effect.Effect<A, E, never>) {
   return AppRuntime.runPromise(
@@ -1604,6 +1605,32 @@ test("ModelNotFoundError for provider includes suggestions", async () => {
   })
 })
 
+test("ModelNotFoundError suggests catalog models for unloaded providers", async () => {
+  await using tmp = await tmpdir({
+    init: async (dir) => {
+      await Bun.write(
+        path.join(dir, "opencode.json"),
+        JSON.stringify({
+          $schema: "https://opencode.ai/config.json",
+        }),
+      )
+    },
+  })
+  await WithInstance.provide({
+    directory: tmp.path,
+    fn: async () => {
+      remove("OPENCODE_API_KEY")
+      try {
+        await getModel(ProviderID.opencode, ModelID.make("claude-haiku-fake-model"))
+        throw new Error("expected model lookup to fail")
+      } catch (e) {
+        if (!Provider.ModelNotFoundError.isInstance(e)) throw e
+        expect(e.data.suggestions).toContain("claude-haiku-4-5")
+      }
+    },
+  })
+})
+
 test("getProvider returns undefined for nonexistent provider", async () => {
   await using tmp = await tmpdir({
     init: async (dir) => {