core: expose v2 model listing API (#25821)

packages/core/src/plugin/provider/opencode.ts

@@ -0,0 +1,27 @@
+import { Effect } from "effect"
+import { PluginV2 } from "../../plugin"
+import { ProviderV2 } from "../../provider"
+
+export const OpencodePlugin = PluginV2.define({
+  id: PluginV2.ID.make("opencode"),
+  effect: Effect.gen(function* () {
+    let hasKey = false
+    return {
+      "provider.update": Effect.fn(function* (evt) {
+        if (evt.provider.id !== ProviderV2.ID.opencode) return
+        hasKey = Boolean(
+            process.env.OPENCODE_API_KEY ||
+            evt.provider.env.some((item) => process.env[item]) ||
+            evt.provider.options.aisdk.provider.apiKey ||
+            (evt.provider.enabled && evt.provider.enabled.via === "auth"),
+        )
+        if (!hasKey) evt.provider.options.aisdk.provider.apiKey = "public"
+      }),
+      "model.update": Effect.fn(function* (evt) {
+        if (evt.model.providerID !== ProviderV2.ID.opencode) return
+        if (hasKey) return
+        if (evt.model.cost.some((item) => item.input > 0)) evt.cancel = true
+      }),
+    }
+  }),
+})