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fix(core): Capture Anthropic stream stop_reason from message_delta #21907

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Merged
nicohrubec merged 1 commit into from
Jul 2, 2026
+11 −5
Merged

fix(core): Capture Anthropic stream stop_reason from message_delta #21907

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6 changes: 5 additions & 1 deletion dev-packages/node-integration-tests/suites/tracing/anthropic/test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ import {
GEN_AI_REQUEST_MODEL_ATTRIBUTE,
GEN_AI_REQUEST_STREAM_ATTRIBUTE,
GEN_AI_REQUEST_TEMPERATURE_ATTRIBUTE,
GEN_AI_RESPONSE_FINISH_REASONS_ATTRIBUTE,
GEN_AI_RESPONSE_ID_ATTRIBUTE,
GEN_AI_RESPONSE_MODEL_ATTRIBUTE,
GEN_AI_RESPONSE_STREAMING_ATTRIBUTE,
Expand Down Expand Up @@ -301,7 +302,9 @@ describe('Anthropic integration', () => {
expect(span.attributes[GEN_AI_RESPONSE_ID_ATTRIBUTE].value).toBe('msg_stream_1');
}

const detailedStreamSpan = requestStreamSpans[0];
const detailedStreamSpan = requestStreamSpans.find(
span => span.attributes[GEN_AI_RESPONSE_FINISH_REASONS_ATTRIBUTE]?.value === '["end_turn"]',
);
expect(detailedStreamSpan).toBeDefined();
expect(detailedStreamSpan!.attributes[GEN_AI_SYSTEM_ATTRIBUTE].value).toBe('anthropic');
expect(detailedStreamSpan!.attributes[GEN_AI_OPERATION_NAME_ATTRIBUTE].value).toBe('chat');
Expand Down Expand Up @@ -426,6 +429,7 @@ describe('Anthropic integration', () => {
expect(span.status).toBe('ok');
expect(span.attributes['sentry.op'].value).toBe('gen_ai.chat');
expect(span.attributes[GEN_AI_RESPONSE_STREAMING_ATTRIBUTE].value).toBe(true);
expect(span.attributes[GEN_AI_RESPONSE_FINISH_REASONS_ATTRIBUTE].value).toBe('["tool_use"]');
expect(span.attributes[GEN_AI_REQUEST_AVAILABLE_TOOLS_ATTRIBUTE].value).toBe(EXPECTED_TOOLS_JSON);
expect(span.attributes[GEN_AI_RESPONSE_TOOL_CALLS_ATTRIBUTE].value).toBe(EXPECTED_TOOL_CALLS_JSON);
}
Expand Down
10 changes: 6 additions & 4 deletions packages/core/src/tracing/anthropic-ai/streaming.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -72,20 +72,22 @@ function isErrorEvent(event: AnthropicAiStreamingEvent, span: Span): boolean {
*/

function handleMessageMetadata(event: AnthropicAiStreamingEvent, state: StreamingState): void {
// The token counts shown in the usage field of the message_delta event are cumulative.
// Cumulative token counts and the final stop reason both arrive on the message_delta event.
// @see https://docs.anthropic.com/en/docs/build-with-claude/streaming#event-types
if (event.type === 'message_delta' && event.usage) {
if ('output_tokens' in event.usage && typeof event.usage.output_tokens === 'number') {
if (event.type === 'message_delta') {
if (event.usage && typeof event.usage.output_tokens === 'number') {
state.completionTokens = event.usage.output_tokens;
}
if (event.delta?.stop_reason) {
state.finishReasons.push(event.delta.stop_reason);
}
}

if (event.message) {
const message = event.message;

if (message.id) state.responseId = message.id;
if (message.model) state.responseModel = message.model;
if (message.stop_reason) state.finishReasons.push(message.stop_reason);

if (message.usage) {
if (typeof message.usage.input_tokens === 'number') state.promptTokens = message.usage.input_tokens;
Expand Down
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