feat(plugin): restore ai request hook

packages/core/test/plugin-hooks.test.ts

@@ -0,0 +1,45 @@
+import { describe, expect } from "bun:test"
+import { Message, SystemPart } from "@opencode-ai/ai"
+import { Agent } from "@opencode-ai/schema/agent"
+import { Model } from "@opencode-ai/schema/model"
+import { Provider } from "@opencode-ai/schema/provider"
+import { Session } from "@opencode-ai/schema/session"
+import { Effect, Layer } from "effect"
+import { PluginHooks } from "../src/plugin/hooks"
+import { testEffect } from "./lib/effect"
+
+const layer = PluginHooks.node.implementation as Layer.Layer<PluginHooks.Service>
+const it = testEffect(layer)
+
+describe("PluginHooks", () => {
+  it.effect("registers scoped AI hooks and triggers them sequentially", () =>
+    Effect.gen(function* () {
+      const hooks = yield* PluginHooks.Service
+      const seen: string[] = []
+      yield* hooks.register("ai", "request", (event) =>
+        Effect.sync(() => {
+          seen.push("first")
+          event.system.push(SystemPart.make("second"))
+        }),
+      )
+      yield* hooks.register("ai", "request", (event) =>
+        Effect.sync(() => {
+          seen.push(event.system[1]?.text ?? "missing")
+          event.messages = [Message.user("changed")]
+        }),
+      )
+      const event = {
+        sessionID: Session.ID.make("ses_hooks"),
+        agent: Agent.ID.make("build"),
+        model: Model.Ref.make({ providerID: Provider.ID.make("test"), id: Model.ID.make("model") }),
+        system: [SystemPart.make("first")],
+        messages: [Message.user("original")],
+        tools: {},
+      }
+
+      expect(yield* hooks.trigger("ai", "request", event)).toBe(event)
+      expect(seen).toEqual(["first", "second"])
+      expect(event.messages).toEqual([Message.user("changed")])
+    }),
+  )
+})