refactor(core): migrate built-in tools to internal plugins (#34956)

packages/core/src/tool/write.ts

@@ -6,15 +6,13 @@
  */
 export * as WriteTool from "./write"
 
+import type { PluginContext } from "@opencode-ai/plugin/v2/effect"
 import { ToolFailure } from "@opencode-ai/llm"
-import { Effect, Layer, Schema } from "effect"
-import { makeLocationNode } from "../effect/app-node"
+import { Effect, Schema } from "effect"
 import { FileMutation } from "../file-mutation"
 import { LocationMutation } from "../location-mutation"
 import { PermissionV2 } from "../permission"
-import { ToolRegistry } from "./registry"
 import { Tool } from "./tool"
-import { Tools } from "./tools"
 
 export const name = "write"
 
@@ -44,14 +42,14 @@ export const toModelOutput = (output: Output) =>
 // TODO: Add snapshots / undo after design exists.
 // TODO: Add LSP notification and diagnostics after V2 LSP runtime exists.
 
-const layer = Layer.effectDiscard(
-  Effect.gen(function* () {
-    const tools = yield* Tools.Service
+export const Plugin = {
+  id: "core-write-tool",
+  effect: Effect.fn("WriteTool.Plugin")(function* (ctx: PluginContext) {
     const mutation = yield* LocationMutation.Service
     const files = yield* FileMutation.Service
     const permission = yield* PermissionV2.Service
 
-    yield* tools
+    yield* ctx.tool
       .register({
         [name]: Tool.withPermission(
           Tool.make({
@@ -92,10 +90,4 @@ const layer = Layer.effectDiscard(
       })
       .pipe(Effect.orDie)
   }),
-)
-
-export const node = makeLocationNode({
-  name: "tool/write",
-  layer,
-  deps: [ToolRegistry.node, LocationMutation.node, FileMutation.node, PermissionV2.node],
-})
+}