feat(plugin): add session request hook (#35794)

packages/plugin/src/v2/effect/session.ts

@@ -0,0 +1,25 @@
+import type { SessionApi } from "@opencode-ai/client/effect/api"
+import type { Message, SystemPart } from "@opencode-ai/llm"
+import type { Agent } from "@opencode-ai/schema/agent"
+import type { Model } from "@opencode-ai/schema/model"
+import type { Session } from "@opencode-ai/schema/session"
+import type { JsonSchema } from "effect"
+import type { Hooks } from "./registration.js"
+
+export interface SessionRequestBeforeEvent {
+  readonly sessionID: Session.ID
+  readonly agent: Agent.ID
+  readonly model: Model.Ref
+  system: Array<SystemPart>
+  messages: Array<Message>
+  tools: Record<string, { description: string; input: JsonSchema.JsonSchema }>
+}
+
+export interface SessionHooks {
+  readonly request: SessionRequestBeforeEvent
+}
+
+export interface SessionDomain
+  extends Pick<SessionApi<unknown>, "create" | "get" | "prompt" | "command" | "interrupt"> {
+  readonly hook: Hooks<SessionHooks>
+}