Add isolate subagent model config settings

Author: wizzomafizzo

packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx

@@ -145,8 +145,12 @@ export function Prompt(props: PromptProps) {
       if (msg.agent && isPrimaryAgent) {
         local.agent.set(msg.agent)
       }
-      if (msg.model) local.model.set(msg.model)
-      if (msg.variant) local.model.variant.set(msg.variant)
+
+      const isolateModel = sync.data.config.isolate_subagent_model
+      if (!isolateModel) {
+        if (msg.model) local.model.set(msg.model)
+        if (msg.variant) local.model.variant.set(msg.variant)
+      }
     }
   })
 

packages/opencode/src/config/config.ts

@@ -817,6 +817,10 @@ export namespace Config {
         .boolean()
         .optional()
         .describe("@deprecated Use 'share' field instead. Share newly created sessions automatically"),
+      isolate_subagent_model: z
+        .boolean()
+        .optional()
+        .describe("Prevent commands and subagents from persisting their model to the parent session"),
       autoupdate: z
         .union([z.boolean(), z.literal("notify")])
         .optional()

packages/sdk/js/src/v2/gen/types.gen.ts

@@ -1590,6 +1590,10 @@ export type Config = {
    * @deprecated Use 'share' field instead. Share newly created sessions automatically
    */
   autoshare?: boolean
+  /**
+   * Prevent commands and subagents from persisting their model to the parent session
+   */
+  isolate_subagent_model?: boolean
   /**
    * Automatically update to the latest version. Set to true to auto-update, false to disable, or 'notify' to show update notifications
    */