feat(id): brand SessionID through Drizzle and Zod schemas (#16953)

packages/opencode/src/tool/plan.ts

@@ -7,9 +7,10 @@ import { MessageV2 } from "../session/message-v2"
 import { Identifier } from "../id/id"
 import { Provider } from "../provider/provider"
 import { Instance } from "../project/instance"
+import type { SessionID } from "../session/schema"
 import EXIT_DESCRIPTION from "./plan-exit.txt"
 
-async function getLastModel(sessionID: string) {
+async function getLastModel(sessionID: SessionID) {
   for await (const item of MessageV2.stream(sessionID)) {
     if (item.info.role === "user" && item.info.model) return item.info.model
   }

packages/opencode/src/tool/task.ts

@@ -2,6 +2,7 @@ import { Tool } from "./tool"
 import DESCRIPTION from "./task.txt"
 import z from "zod"
 import { Session } from "../session"
+import { SessionID } from "../session/schema"
 import { MessageV2 } from "../session/message-v2"
 import { Identifier } from "../id/id"
 import { Agent } from "../agent/agent"
@@ -65,7 +66,7 @@ export const TaskTool = Tool.define("task", async (ctx) => {
 
       const session = await iife(async () => {
         if (params.task_id) {
-          const found = await Session.get(params.task_id).catch(() => {})
+          const found = await Session.get(SessionID.make(params.task_id)).catch(() => {})
           if (found) return found
         }
 

packages/opencode/src/tool/tool.ts

@@ -2,6 +2,7 @@ import z from "zod"
 import type { MessageV2 } from "../session/message-v2"
 import type { Agent } from "../agent/agent"
 import type { PermissionNext } from "../permission/next"
+import type { SessionID } from "../session/schema"
 import { Truncate } from "./truncation"
 
 export namespace Tool {
@@ -14,7 +15,7 @@ export namespace Tool {
   }
 
   export type Context<M extends Metadata = Metadata> = {
-    sessionID: string
+    sessionID: SessionID
     messageID: string
     agent: string
     abort: AbortSignal