fix(llm): preserve tool error defects (#27403)

packages/llm/src/schema/errors.ts

@@ -198,5 +198,6 @@ export class LLMError extends Schema.TaggedErrorClass<LLMError>()("LLM.Error", {
  */
 export class ToolFailure extends Schema.TaggedErrorClass<ToolFailure>()("LLM.ToolFailure", {
   message: Schema.String,
+  error: Schema.optional(Schema.Defect),
   metadata: Schema.optional(Schema.Record(Schema.String, Schema.Unknown)),
 }) {}

packages/llm/src/schema/events.ts

@@ -171,6 +171,7 @@ export const ToolError = Schema.Struct({
   id: ToolCallID,
   name: Schema.String,
   message: Schema.String,
+  error: Schema.optional(Schema.Defect),
   providerMetadata: Schema.optional(ProviderMetadata),
 }).annotate({ identifier: "LLM.Event.ToolError" })
 export type ToolError = Schema.Schema.Type<typeof ToolError>