refactor(session): effectify SessionPrompt service (#19483)

packages/opencode/src/tool/tool.ts

@@ -25,22 +25,24 @@ export namespace Tool {
     metadata(input: { title?: string; metadata?: M }): void
     ask(input: Omit<Permission.Request, "id" | "sessionID" | "tool">): Promise<void>
   }
+  export interface Def<Parameters extends z.ZodType = z.ZodType, M extends Metadata = Metadata> {
+    description: string
+    parameters: Parameters
+    execute(
+      args: z.infer<Parameters>,
+      ctx: Context,
+    ): Promise<{
+      title: string
+      metadata: M
+      output: string
+      attachments?: Omit<MessageV2.FilePart, "id" | "sessionID" | "messageID">[]
+    }>
+    formatValidationError?(error: z.ZodError): string
+  }
+
   export interface Info<Parameters extends z.ZodType = z.ZodType, M extends Metadata = Metadata> {
     id: string
-    init: (ctx?: InitContext) => Promise<{
-      description: string
-      parameters: Parameters
-      execute(
-        args: z.infer<Parameters>,
-        ctx: Context,
-      ): Promise<{
-        title: string
-        metadata: M
-        output: string
-        attachments?: Omit<MessageV2.FilePart, "id" | "sessionID" | "messageID">[]
-      }>
-      formatValidationError?(error: z.ZodError): string
-    }>
+    init: (ctx?: InitContext) => Promise<Def<Parameters, M>>
   }
 
   export type InferParameters<T extends Info> = T extends Info<infer P> ? z.infer<P> : never
@@ -48,7 +50,7 @@ export namespace Tool {
 
   export function define<Parameters extends z.ZodType, Result extends Metadata>(
     id: string,
-    init: Info<Parameters, Result>["init"] | Awaited<ReturnType<Info<Parameters, Result>["init"]>>,
+    init: Info<Parameters, Result>["init"] | Def<Parameters, Result>,
   ): Info<Parameters, Result> {
     return {
       id,