Remove Zod from named errors (#26982)

packages/opencode/src/session/message-v2.ts

@@ -382,9 +382,7 @@ export type Part =
 
 const AssistantErrorSchema = Schema.Union([
   AuthError.EffectSchema,
-  Schema.Struct({ name: Schema.Literal("UnknownError"), data: Schema.Struct({ message: Schema.String }) }).annotate({
-    identifier: "UnknownError",
-  }),
+  NamedError.Unknown.EffectSchema,
   OutputLengthError.EffectSchema,
   AbortedError.EffectSchema,
   StructuredOutputError.EffectSchema,

packages/opencode/src/session/message.ts

@@ -3,6 +3,7 @@ import { SessionID } from "./schema"
 import { ModelID, ProviderID } from "../provider/schema"
 import { NonNegativeInt } from "@opencode-ai/core/schema"
 import { namedSchemaError } from "@/util/named-schema-error"
+import { NamedError } from "@opencode-ai/core/util/error"
 
 export const OutputLengthError = namedSchemaError("MessageOutputLengthError", {})
 export const AuthError = namedSchemaError("ProviderAuthError", {
@@ -10,26 +11,6 @@ export const AuthError = namedSchemaError("ProviderAuthError", {
   message: Schema.String,
 })
 
-const AuthErrorEffect = Schema.Struct({
-  name: Schema.Literal("ProviderAuthError"),
-  data: Schema.Struct({
-    providerID: Schema.String,
-    message: Schema.String,
-  }),
-})
-
-const OutputLengthErrorEffect = Schema.Struct({
-  name: Schema.Literal("MessageOutputLengthError"),
-  data: Schema.Struct({}),
-})
-
-const UnknownErrorEffect = Schema.Struct({
-  name: Schema.Literal("UnknownError"),
-  data: Schema.Struct({
-    message: Schema.String,
-  }),
-})
-
 export const ToolCall = Schema.Struct({
   state: Schema.Literal("call"),
   step: Schema.optional(NonNegativeInt),
@@ -124,7 +105,9 @@ export const Info = Schema.Struct({
       created: NonNegativeInt,
       completed: Schema.optional(NonNegativeInt),
     }),
-    error: Schema.optional(Schema.Union([AuthErrorEffect, UnknownErrorEffect, OutputLengthErrorEffect])),
+    error: Schema.optional(
+      Schema.Union([AuthError.EffectSchema, NamedError.Unknown.EffectSchema, OutputLengthError.EffectSchema]),
+    ),
     sessionID: SessionID,
     tool: Schema.Record(
       Schema.String,

packages/opencode/src/session/retry.ts

@@ -2,6 +2,7 @@ import type { NamedError } from "@opencode-ai/core/util/error"
 import { Cause, Clock, Duration, Effect, Schedule } from "effect"
 import { MessageV2 } from "./message-v2"
 import { iife } from "@/util/iife"
+import { isRecord } from "@/util/record"
 
 export type Err = ReturnType<NamedError["toObject"]>
 
@@ -121,7 +122,7 @@ export function retryable(error: Err, provider: string) {
   }
 
   // Check for rate limit patterns in plain text error messages
-  const msg = error.data?.message
+  const msg = isRecord(error.data) ? error.data.message : undefined
   if (typeof msg === "string") {
     const lower = msg.toLowerCase()
     if (
@@ -133,7 +134,7 @@ export function retryable(error: Err, provider: string) {
     }
   }
 
-  const json = parseJSON(error.data?.message)
+  const json = parseJSON(msg)
   if (!json || typeof json !== "object") return undefined
   const code = typeof json.code === "string" ? json.code : ""