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Merged
Lms24 merged 6 commits into from
Dec 19, 2025
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Merged

fix(vercelai): input token count #18574

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5039a40
fix(vercelai): input otken count
obostjancic Dec 19, 2025
18730de
lint
obostjancic Dec 19, 2025
9c15e4f
test
obostjancic Dec 19, 2025
a5bc19c
unit test
obostjancic Dec 19, 2025
64a9751
lint
obostjancic Dec 19, 2025
4c668ab
fix lint, again
obostjancic Dec 19, 2025
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9 changes: 9 additions & 0 deletions packages/core/src/tracing/vercel-ai/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,15 @@ function processEndedVercelAiSpan(span: SpanJSON): void {
renameAttributeKey(attributes, AI_USAGE_PROMPT_TOKENS_ATTRIBUTE, GEN_AI_USAGE_INPUT_TOKENS_ATTRIBUTE);
renameAttributeKey(attributes, AI_USAGE_CACHED_INPUT_TOKENS_ATTRIBUTE, GEN_AI_USAGE_INPUT_TOKENS_CACHED_ATTRIBUTE);

// Input tokens is the sum of prompt tokens and cached input tokens
if (
typeof attributes[GEN_AI_USAGE_INPUT_TOKENS_ATTRIBUTE] === 'number' &&
typeof attributes[GEN_AI_USAGE_INPUT_TOKENS_CACHED_ATTRIBUTE] === 'number'
) {
attributes[GEN_AI_USAGE_INPUT_TOKENS_ATTRIBUTE] =
attributes[GEN_AI_USAGE_INPUT_TOKENS_ATTRIBUTE] + attributes[GEN_AI_USAGE_INPUT_TOKENS_CACHED_ATTRIBUTE];
}

if (
typeof attributes[GEN_AI_USAGE_OUTPUT_TOKENS_ATTRIBUTE] === 'number' &&
typeof attributes[GEN_AI_USAGE_INPUT_TOKENS_ATTRIBUTE] === 'number'
Expand Down
39 changes: 39 additions & 0 deletions packages/core/test/lib/tracing/vercel-ai-cached-tokens.test.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,39 @@
import { describe, expect, it } from 'vitest';
import { addVercelAiProcessors } from '../../../src/tracing/vercel-ai';
import type { SpanJSON } from '../../../src/types-hoist/span';
import { getDefaultTestClientOptions, TestClient } from '../../mocks/client';

describe('vercel-ai cached tokens', () => {
it('should add cached input tokens to total input tokens', () => {
const options = getDefaultTestClientOptions({ tracesSampleRate: 1.0 });
const client = new TestClient(options);
client.init();
addVercelAiProcessors(client);

const mockSpan: SpanJSON = {
description: 'test',
span_id: 'test-span-id',
trace_id: 'test-trace-id',
start_timestamp: 1000,
timestamp: 2000,
origin: 'auto.vercelai.otel',
data: {
'ai.usage.promptTokens': 100,
'ai.usage.cachedInputTokens': 50,
},
};

const event = {
type: 'transaction' as const,
spans: [mockSpan],
};

const eventProcessor = client['_eventProcessors'].find(processor => processor.id === 'VercelAiEventProcessor');
expect(eventProcessor).toBeDefined();

const processedEvent = eventProcessor!(event, {});

expect(processedEvent?.spans?.[0]?.data?.['gen_ai.usage.input_tokens']).toBe(150);
expect(processedEvent?.spans?.[0]?.data?.['gen_ai.usage.input_tokens.cached']).toBe(50);
});
});
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