refactor(server): canonicalize service API (#31049)

packages/server/src/groups/agent.ts

@@ -0,0 +1,22 @@
+import { AgentV2 } from "@opencode-ai/core/agent"
+import { Location } from "@opencode-ai/core/location"
+import { Schema } from "effect"
+import { HttpApiEndpoint, HttpApiGroup, OpenApi } from "effect/unstable/httpapi"
+import { LocationQuery, locationQueryOpenApi, LocationMiddleware } from "./location"
+
+export const AgentGroup = HttpApiGroup.make("server.agent")
+  .add(
+    HttpApiEndpoint.get("agent.list", "/api/agent", {
+      query: LocationQuery,
+      success: Location.response(Schema.Array(AgentV2.Info)),
+    })
+      .annotateMerge(locationQueryOpenApi)
+      .annotateMerge(
+        OpenApi.annotations({
+          identifier: "v2.agent.list",
+          summary: "List agents",
+          description: "Retrieve currently registered agents.",
+        }),
+      ),
+  )
+  .middleware(LocationMiddleware)