Improve v2 session message rendering (#25634)

packages/opencode/src/session/processor.ts

@@ -22,6 +22,7 @@ import * as Log from "@opencode-ai/core/util/log"
 import { isRecord } from "@/util/record"
 import { EventV2 } from "@/v2/event"
 import { SessionEvent } from "@/v2/session-event"
+import { Modelv2 } from "@/v2/model"
 import * as DateTime from "effect/DateTime"
 
 const DOOM_LOOP_THRESHOLD = 3
@@ -432,9 +433,9 @@ export const layer: Layer.Layer<
                 sessionID: ctx.sessionID,
                 agent: input.assistantMessage.agent,
                 model: {
-                  id: ctx.model.id,
-                  providerID: ctx.model.providerID,
-                  variant: input.assistantMessage.variant,
+                  id: Modelv2.ID.make(ctx.model.id),
+                  providerID: Modelv2.ProviderID.make(ctx.model.providerID),
+                  variant: Modelv2.VariantID.make(input.assistantMessage.variant ?? "default"),
                 },
                 snapshot: ctx.snapshot,
                 timestamp: DateTime.makeUnsafe(Date.now()),
@@ -655,7 +656,7 @@ export const layer: Layer.Layer<
           EventV2.run(SessionEvent.Step.Failed.Sync, {
             sessionID: ctx.sessionID,
             error: {
-              type: error.name,
+              type: "unknown",
               message: errorMessage(e),
             },
             timestamp: DateTime.makeUnsafe(Date.now()),