refactor(schema): tighten public contracts (#33771)

packages/opencode/src/session/todo.ts

@@ -14,7 +14,7 @@ export type Info = SessionTodo.Info
 export const Event = SessionTodo.Event
 
 export interface Interface {
-  readonly update: (input: { sessionID: SessionID; todos: Info[] }) => Effect.Effect<void>
+  readonly update: (input: { sessionID: SessionID; todos: ReadonlyArray<Info> }) => Effect.Effect<void>
   readonly get: (sessionID: SessionID) => Effect.Effect<Info[]>
 }
 
@@ -26,7 +26,7 @@ export const layer = Layer.effect(
     const events = yield* EventV2Bridge.Service
     const { db } = yield* Database.Service
 
-    const update = Effect.fn("Todo.update")(function* (input: { sessionID: SessionID; todos: Info[] }) {
+    const update = Effect.fn("Todo.update")(function* (input: { sessionID: SessionID; todos: ReadonlyArray<Info> }) {
       yield* db
         .transaction((tx) =>
           Effect.gen(function* () {

packages/opencode/src/tool/todo.ts

@@ -3,19 +3,8 @@ import * as Tool from "./tool"
 import DESCRIPTION_WRITE from "./todowrite.txt"
 import { Todo } from "../session/todo"
 
-// Todo.Info is still a zod schema (session/todo.ts). Inline the field shape
-// here rather than referencing its `.shape` — the LLM-visible JSON Schema is
-// identical, and it removes the last zod dependency from this tool.
-const TodoItem = Schema.Struct({
-  content: Schema.String.annotate({ description: "Brief description of the task" }),
-  status: Schema.String.annotate({
-    description: "Current status of the task: pending, in_progress, completed, cancelled",
-  }),
-  priority: Schema.String.annotate({ description: "Priority level of the task: high, medium, low" }),
-})
-
 export const Parameters = Schema.Struct({
-  todos: Schema.mutable(Schema.Array(TodoItem)).annotate({ description: "The updated todo list" }),
+  todos: Schema.mutable(Schema.Array(Todo.Info)).annotate({ description: "The updated todo list" }),
 })
 
 type Metadata = {