feat(plugin): expose app metadata (#38179)

packages/core/src/app.ts

@@ -0,0 +1,33 @@
+export * as App from "./app"
+
+import { Context, Layer } from "effect"
+import { makeGlobalNode } from "@opencode-ai/util/effect/app-node"
+
+export interface Info {
+  readonly name: string
+  readonly version: string
+  readonly channel: string
+}
+
+export const Metadata = Context.Reference<Info>("@opencode/App", {
+  defaultValue: () => make(),
+})
+
+export function make(input: Partial<Info> = {}): Info {
+  return {
+    name: input.name ?? "opencode",
+    version: input.version ?? "unknown",
+    channel: input.channel ?? "unknown",
+  }
+}
+
+export function useragent(app: Info) {
+  return `opencode/${app.channel}/${app.version}/${app.name}`
+}
+
+export const layer = (input?: Partial<Info>) => Layer.succeed(Metadata, make(input))
+
+export const configured = (input?: Partial<Info>) =>
+  makeGlobalNode({ service: Metadata, layer: layer(input), deps: [] })
+
+export const node = configured()