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()),

packages/opencode/src/session/projectors-next.ts

@@ -132,11 +132,7 @@ export default [
   SyncEvent.project(SessionEvent.ModelSwitched.Sync, (db, data, event) => {
     db.update(SessionTable)
       .set({
-        model: {
-          id: data.id,
-          providerID: data.providerID,
-          variant: data.variant,
-        },
+        model: data.model,
         time_updated: DateTime.toEpochMillis(data.timestamp),
       })
       .where(eq(SessionTable.id, data.sessionID))

packages/opencode/src/session/prompt.ts

@@ -56,6 +56,7 @@ import { SessionRunState } from "./run-state"
 import { EffectBridge } from "@/effect/bridge"
 import { EventV2 } from "@/v2/event"
 import { SessionEvent } from "@/v2/session-event"
+import { Modelv2 } from "@/v2/model"
 import { AgentAttachment, FileAttachment, Source } from "@/v2/session-prompt"
 import * as DateTime from "effect/DateTime"
 import { eq } from "@/storage/db"
@@ -978,9 +979,11 @@ NOTE: At any point in time through this workflow you should feel free to ask the
         EventV2.run(SessionEvent.ModelSwitched.Sync, {
           sessionID: input.sessionID,
           timestamp: DateTime.makeUnsafe(info.time.created),
-          id: info.model.modelID,
-          providerID: info.model.providerID,
-          variant: info.model.variant,
+          model: {
+            id: Modelv2.ID.make(info.model.modelID),
+            providerID: Modelv2.ProviderID.make(info.model.providerID),
+            variant: Modelv2.VariantID.make(info.model.variant ?? "default"),
+          },
         })
       }