fix(opencode): export AI SDK telemetry spans (#22526)

packages/opencode/src/agent/agent.ts

@@ -21,6 +21,8 @@ import { Plugin } from "@/plugin"
 import { Skill } from "../skill"
 import { Effect, Context, Layer } from "effect"
 import { InstanceState } from "@/effect/instance-state"
+import * as Option from "effect/Option"
+import * as OtelTracer from "@effect/opentelemetry/Tracer"
 
 export namespace Agent {
   export const Info = z
@@ -334,6 +336,9 @@ export namespace Agent {
           const model = input.model ?? (yield* provider.defaultModel())
           const resolved = yield* provider.getModel(model.providerID, model.modelID)
           const language = yield* provider.getLanguage(resolved)
+          const tracer = cfg.experimental?.openTelemetry
+            ? Option.getOrUndefined(yield* Effect.serviceOption(OtelTracer.OtelTracer))
+            : undefined
 
           const system = [PROMPT_GENERATE]
           yield* plugin.trigger("experimental.chat.system.transform", { model: resolved }, { system })
@@ -346,6 +351,7 @@ export namespace Agent {
           const params = {
             experimental_telemetry: {
               isEnabled: cfg.experimental?.openTelemetry,
+              tracer,
               metadata: {
                 userId: cfg.username ?? "unknown",
               },