fix(core): Use ai.operationId for Vercel AI V6 operation name mapping (#20285)

Vercel AI SDK V6 appends `functionId` to the `operation.name` span
attribute (e.g., `ai.streamText myAgent`), causing
`mapVercelAiOperationName` to miss the exact-match lookup and leave
`gen_ai.operation.name` unmapped. This fix uses the `ai.operationId`
attribute (which always contains the bare operation like
`ai.streamText`) when present, falling back to `operation.name` for
older Vercel SDK versions. The existing `ToolLoopAgent` integration test
is strengthened with a functionId to prevent regression.

Closes #20284

Author: nicohrubec

dev-packages/node-integration-tests/suites/tracing/vercelai/v6/scenario-tool-loop-agent.mjs

@@ -8,7 +8,7 @@ async function run() {
     let callCount = 0;
 
     const agent = new ToolLoopAgent({
-      experimental_telemetry: { isEnabled: true },
+      experimental_telemetry: { isEnabled: true, functionId: 'weather_agent' },
       model: new MockLanguageModelV3({
         doGenerate: async () => {
           if (callCount++ === 0) {

dev-packages/node-integration-tests/suites/tracing/vercelai/v6/test.ts

@@ -619,6 +619,7 @@ describe('Vercel AI integration (V6)', () => {
                 [SEMANTIC_ATTRIBUTE_SENTRY_ORIGIN]: 'auto.vercelai.otel',
                 [GEN_AI_REQUEST_MODEL_ATTRIBUTE]: 'mock-model-id',
               }),
+              description: 'invoke_agent weather_agent',
               op: 'gen_ai.invoke_agent',
               origin: 'auto.vercelai.otel',
               status: 'ok',
@@ -633,6 +634,7 @@ describe('Vercel AI integration (V6)', () => {
                 [GEN_AI_USAGE_OUTPUT_TOKENS_ATTRIBUTE]: 20,
                 [GEN_AI_RESPONSE_FINISH_REASONS_ATTRIBUTE]: ['tool-calls'],
               }),
+              description: 'generate_content mock-model-id',
               op: 'gen_ai.generate_content',
               origin: 'auto.vercelai.otel',
               status: 'ok',
@@ -662,6 +664,7 @@ describe('Vercel AI integration (V6)', () => {
                 [GEN_AI_USAGE_OUTPUT_TOKENS_ATTRIBUTE]: 25,
                 [GEN_AI_RESPONSE_FINISH_REASONS_ATTRIBUTE]: ['stop'],
               }),
+              description: 'generate_content mock-model-id',
               op: 'gen_ai.generate_content',
               origin: 'auto.vercelai.otel',
               status: 'ok',

packages/core/src/tracing/vercel-ai/index.ts

@@ -322,7 +322,13 @@ function processEndedVercelAiSpan(span: SpanJSON): void {
   // Rename AI SDK attributes to standardized gen_ai attributes
   // Map operation.name to OpenTelemetry semantic convention values
   if (attributes[OPERATION_NAME_ATTRIBUTE]) {
-    const operationName = mapVercelAiOperationName(attributes[OPERATION_NAME_ATTRIBUTE] as string);
+    // V6+ sets ai.operationId to the bare operation (e.g. "ai.streamText") while
+    // operation.name appends functionId (e.g. "ai.streamText myAgent").
+    // When ai.operationId is present, use it for correct mapping.
+    const rawOperationName = attributes[AI_OPERATION_ID_ATTRIBUTE]
+      ? (attributes[AI_OPERATION_ID_ATTRIBUTE] as string)
+      : (attributes[OPERATION_NAME_ATTRIBUTE] as string);
+    const operationName = mapVercelAiOperationName(rawOperationName);
     attributes[GEN_AI_OPERATION_NAME_ATTRIBUTE] = operationName;
     // eslint-disable-next-line @typescript-eslint/no-dynamic-delete
     delete attributes[OPERATION_NAME_ATTRIBUTE];