refactor(core): resolve default agent info (#27125)

packages/opencode/src/agent/agent.ts

@@ -57,6 +57,7 @@ const GeneratedAgent = Schema.Struct({
 export interface Interface {
   readonly get: (agent: string) => Effect.Effect<Info>
   readonly list: () => Effect.Effect<Info[]>
+  readonly defaultInfo: () => Effect.Effect<Info>
   readonly defaultAgent: () => Effect.Effect<string>
   readonly generate: (input: {
     description: string
@@ -333,23 +334,28 @@ export const layer = Layer.effect(
           )
         })
 
-        const defaultAgent = Effect.fnUntraced(function* () {
+        const defaultInfo = Effect.fnUntraced(function* () {
           const c = yield* config.get()
           if (c.default_agent) {
             const agent = agents[c.default_agent]
             if (!agent) throw new Error(`default agent "${c.default_agent}" not found`)
             if (agent.mode === "subagent") throw new Error(`default agent "${c.default_agent}" is a subagent`)
             if (agent.hidden === true) throw new Error(`default agent "${c.default_agent}" is hidden`)
-            return agent.name
+            return agent
           }
           const visible = Object.values(agents).find((a) => a.mode !== "subagent" && a.hidden !== true)
           if (!visible) throw new Error("no primary visible agent found")
-          return visible.name
+          return visible
+        })
+
+        const defaultAgent = Effect.fnUntraced(function* () {
+          return (yield* defaultInfo()).name
         })
 
         return {
           get,
           list,
+          defaultInfo,
           defaultAgent,
         } satisfies State
       }),
@@ -362,6 +368,9 @@ export const layer = Layer.effect(
       list: Effect.fn("Agent.list")(function* () {
         return yield* InstanceState.useEffect(state, (s) => s.list())
       }),
+      defaultInfo: Effect.fn("Agent.defaultInfo")(function* () {
+        return yield* InstanceState.useEffect(state, (s) => s.defaultInfo())
+      }),
       defaultAgent: Effect.fn("Agent.defaultAgent")(function* () {
         return yield* InstanceState.useEffect(state, (s) => s.defaultAgent())
       }),