diff --git a/packages/ai/src/protocols/anthropic-messages.ts b/packages/ai/src/protocols/anthropic-messages.ts
index 2edfcce975f..0df11b2aa9d 100644
--- a/packages/ai/src/protocols/anthropic-messages.ts
+++ b/packages/ai/src/protocols/anthropic-messages.ts
@@ -422,14 +422,14 @@ const lowerMedia = Effect.fn("AnthropicMessages.lowerMedia")(function* (part: Me
 
 // Tool results may carry structured text, images, and documents. Keep media as provider-native
 // content instead of JSON-stringifying base64 into a prompt string.
-const lowerToolResultContentItem = Effect.fn("AnthropicMessages.lowerToolResultContentItem")(function* (
+const lowerToolResultContentItem = Effect.fnUntraced(function* (
   item: Tool.Content,
 ) {
   if (item.type === "text") return { type: "text" as const, text: item.text } satisfies AnthropicTextBlock
   return yield* lowerMedia({ type: "media", mediaType: item.mime, data: item.uri, filename: item.name })
 })
 
-const lowerToolResultContent = Effect.fn("AnthropicMessages.lowerToolResultContent")(function* (part: ToolResultPart) {
+const lowerToolResultContent = Effect.fnUntraced(function* (part: ToolResultPart) {
   // Text / json / error results stay as a string for backward compatibility
   // with existing cassettes and provider expectations.
   if (part.result.type !== "content") return ProviderShared.toolResultText(part)
diff --git a/packages/ai/src/protocols/open-responses.ts b/packages/ai/src/protocols/open-responses.ts
index 03068b24fc1..d6c99cd7a4a 100644
--- a/packages/ai/src/protocols/open-responses.ts
+++ b/packages/ai/src/protocols/open-responses.ts
@@ -358,7 +358,7 @@ const lowerMedia = Effect.fn("OpenResponses.lowerMedia")(function* (
   return { type: "input_image" as const, image_url: media.dataUrl }
 })
 
-const lowerUserContent = Effect.fn("OpenResponses.lowerUserContent")(function* (
+const lowerUserContent = Effect.fnUntraced(function* (
   part: LLMRequest["messages"][number]["content"][number],
   request: LLMRequest,
   extension: Extension,
@@ -370,7 +370,7 @@ const lowerUserContent = Effect.fn("OpenResponses.lowerUserContent")(function* (
 
 // Tool results may carry structured text, images, and files. Keep media as provider-native
 // content instead of JSON-stringifying base64 into a prompt string.
-const lowerToolResultContentItem = Effect.fn("OpenResponses.lowerToolResultContentItem")(function* (
+const lowerToolResultContentItem = Effect.fnUntraced(function* (
   item: Content,
   request: LLMRequest,
   extension: Extension,
@@ -383,7 +383,7 @@ const lowerToolResultContentItem = Effect.fn("OpenResponses.lowerToolResultConte
   )
 })
 
-const lowerToolResultOutput = Effect.fn("OpenResponses.lowerToolResultOutput")(function* (
+const lowerToolResultOutput = Effect.fnUntraced(function* (
   part: ToolResultPart,
   request: LLMRequest,
   extension: Extension,