feat(core): add embedded v2 session runtime and tool foundation (#30632)

packages/core/src/tool/todowrite.ts

@@ -0,0 +1,50 @@
+export * as TodoWriteTool from "./todowrite"
+
+import { Tool, ToolFailure, toolText } from "@opencode-ai/llm"
+import { Cause, Effect, Layer, Schema } from "effect"
+import { SessionTodo } from "../session/todo"
+import { ToolRegistry } from "../tool-registry"
+
+export const name = "todowrite"
+
+export const Parameters = Schema.Struct({
+  todos: Schema.Array(SessionTodo.Info).annotate({ description: "The updated todo list" }),
+})
+
+export const Success = Schema.Struct({
+  todos: Schema.Array(SessionTodo.Info),
+})
+export type Success = typeof Success.Type
+
+export const toModelOutput = (output: Success) => JSON.stringify(output.todos, null, 2)
+
+const definition = Tool.make({
+  description:
+    "Create and maintain a structured task list for the current coding session. Use it to track progress during multi-step work and keep todo statuses current.",
+  parameters: Parameters,
+  success: Success,
+  toModelOutput: ({ output }) => [toolText({ type: "text", text: toModelOutput(output) })],
+})
+
+export const layer = Layer.effectDiscard(
+  Effect.gen(function* () {
+    const registry = yield* ToolRegistry.Service
+    const todos = yield* SessionTodo.Service
+
+    yield* registry.contribute((editor) =>
+      editor.set(name, {
+        tool: definition,
+        execute: ({ parameters, sessionID, assertPermission }) =>
+          Effect.gen(function* () {
+            yield* assertPermission({ action: name, resources: ["*"], save: ["*"] })
+            yield* todos.update({ sessionID, todos: parameters.todos })
+            return { todos: parameters.todos }
+          }).pipe(
+            Effect.catchCause((cause) =>
+              Effect.fail(new ToolFailure({ message: "Unable to update todos", error: Cause.squash(cause) })),
+            ),
+          ),
+      }),
+    )
+  }),
+)