From 5d4ce14dc476123032ecbcff31bbd51f03831530 Mon Sep 17 00:00:00 2001
From: "opencode-agent[bot]"
 <219766164+opencode-agent[bot]@users.noreply.github.com>
Date: Thu, 27 Aug 2026 17:59:43 -0400
Subject: [PATCH] fix(core): skip tracing streamed LLM deltas (#45761)

Co-authored-by: jlongster <17031+jlongster@users.noreply.github.com>
---
 packages/core/src/session/runner/publish-llm-event.ts | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/packages/core/src/session/runner/publish-llm-event.ts b/packages/core/src/session/runner/publish-llm-event.ts
index a03da9734b8..3c51cb18d72 100644
--- a/packages/core/src/session/runner/publish-llm-event.ts
+++ b/packages/core/src/session/runner/publish-llm-event.ts
@@ -378,7 +378,7 @@ export const createLLMEventPublisher = (bus: Pick<Bus.Interface, "publish">, inp
     (error: SessionError.Error, scope: "hosted" | "all" = "all") => failTools(error, scope),
   )
 
-  const publish = Effect.fn("SessionRunner.publishLLMEvent")(function* (event: LLMEvent) {
+  const publish = Effect.fnUntraced(function* (event: LLMEvent) {
     switch (event.type) {
       case "step-start":
         yield* startAssistant()
@@ -535,6 +535,8 @@ export const createLLMEventPublisher = (bus: Pick<Bus.Interface, "publish">, inp
     }
   })
 
+  const publishTraced = Effect.fn("SessionRunner.publishLLMEvent")(publish)
+
   const progress = Effect.fnUntraced(function* (id: string, update: Tool.Metadata) {
     const tool = tools.get(id)
     if (!tool?.called || tool.settled) return yield* Effect.die(new Error(`Tool progress outside running call: ${id}`))
@@ -573,7 +575,11 @@ export const createLLMEventPublisher = (bus: Pick<Bus.Interface, "publish">, inp
   })
 
   return {
-    publish,
+    publish: (event: LLMEvent) => {
+      if (event.type === "text-delta" || event.type === "reasoning-delta" || event.type === "tool-input-delta")
+        return publish(event)
+      return publishTraced(event)
+    },
     progress,
     toolExecution,
     flush,