feat(core): deliver CodeMode catalog through instructions (#38003)

packages/core/src/codemode/instructions.ts

@@ -0,0 +1,45 @@
+export * as CodeModeInstructions from "./instructions"
+
+import { Context, Effect, Layer, Schema } from "effect"
+import { AgentV2 } from "../agent"
+import { CodeMode } from "../codemode"
+import { makeLocationNode } from "../effect/app-node"
+import { Instructions } from "../instructions/index"
+
+export interface Interface {
+  readonly load: (agent: AgentV2.Selection) => Effect.Effect<Instructions.Instructions>
+}
+
+export class Service extends Context.Service<Service, Interface>()("@opencode/v2/CodeModeInstructions") {}
+
+const layer = Layer.effect(
+  Service,
+  Effect.gen(function* () {
+    const codeMode = yield* CodeMode.Service
+
+    return Service.of({
+      load: Effect.fn("CodeModeInstructions.load")(function* (selection) {
+        const instructions = selection.info
+          ? (yield* codeMode.materialize(selection.info.permissions)).instructions
+          : undefined
+        return Instructions.make({
+          key: Instructions.Key.make("core/codemode"),
+          codec: Schema.toCodecJson(Schema.String),
+          read: Effect.succeed(instructions ?? Instructions.removed),
+          render: {
+            initial: (current) => current,
+            changed: (_previous, current) =>
+              [
+                "The Code Mode tool catalog has changed. This catalog supersedes the previous Code Mode tool catalog.",
+                current,
+              ].join("\n\n"),
+            removed: () =>
+              "Code Mode tools are no longer available. Do not use any previously listed Code Mode tools.",
+          },
+        })
+      }),
+    })
+  }),
+)
+
+export const node = makeLocationNode({ service: Service, layer, deps: [CodeMode.node] })