diff --git a/packages/client/script/build.ts b/packages/client/script/build.ts
index a69a54a6fa..95af4c026e 100644
--- a/packages/client/script/build.ts
+++ b/packages/client/script/build.ts
@@ -3,6 +3,7 @@ import { SessionGroup } from "@opencode-ai/server/groups/session"
 import { compile, emitEffectImported, emitPromise, write } from "@opencode-ai/httpapi-codegen"
 import { Effect } from "effect"
 import { HttpApi } from "effect/unstable/httpapi"
+import { fileURLToPath } from "url"
 
 const Api = HttpApi.make("opencode-client").add(SessionGroup)
 const contract = compile(Api, { groupNames: { "server.session": "sessions" } })
@@ -10,13 +11,13 @@ const contract = compile(Api, { groupNames: { "server.session": "sessions" } })
 await Effect.runPromise(
   Effect.all(
     [
-      write(emitPromise(contract), new URL("../src/generated", import.meta.url).pathname),
+      write(emitPromise(contract), fileURLToPath(new URL("../src/generated", import.meta.url))),
       write(
         emitEffectImported(contract, {
           module: "@opencode-ai/server/groups/session",
           group: "SessionGroup",
         }),
-        new URL("../src/generated-effect", import.meta.url).pathname,
+        fileURLToPath(new URL("../src/generated-effect", import.meta.url)),
       ),
     ],
     { concurrency: 2, discard: true },
diff --git a/packages/client/src/effect-embedded.ts b/packages/client/src/effect-embedded.ts
index 8fc8bd9cf9..746827a405 100644
--- a/packages/client/src/effect-embedded.ts
+++ b/packages/client/src/effect-embedded.ts
@@ -44,11 +44,11 @@ export const create = Effect.fn("OpenCode.create")(function* () {
   }
 })
 
-export interface Interface extends Effect.Success<ReturnType<typeof create>> {}
+export type Interface = Effect.Success<ReturnType<typeof create>>
 
 export class Service extends Context.Service<Service, Interface>()("@opencode-ai/client/OpenCode") {}
 
-export const layer = Layer.effect(Service, create().pipe(Effect.map(Service.of)))
+export const layer = Layer.effect(Service, create())
 
 export { ClientError } from "./generated-effect/index"
 export { Tool } from "@opencode-ai/core/public/tool"