feat(core): Automatically disable truncation when span streaming is enabled in Anthropic AI integration

When span streaming is enabled, the `enableTruncation` option now defaults
to `false` unless the user has explicitly set it.

Closes: #20222

Author: andreiborza

dev-packages/node-integration-tests/suites/tracing/anthropic/instrument-streaming-with-truncation.mjs

@@ -0,0 +1,16 @@
+import * as Sentry from '@sentry/node';
+import { loggingTransport } from '@sentry-internal/node-integration-tests';
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  release: '1.0',
+  tracesSampleRate: 1.0,
+  sendDefaultPii: true,
+  transport: loggingTransport,
+  traceLifecycle: 'stream',
+  integrations: [
+    Sentry.anthropicAIIntegration({
+      enableTruncation: true,
+    }),
+  ],
+});

dev-packages/node-integration-tests/suites/tracing/anthropic/instrument-streaming.mjs

@@ -0,0 +1,11 @@
+import * as Sentry from '@sentry/node';
+import { loggingTransport } from '@sentry-internal/node-integration-tests';
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  release: '1.0',
+  tracesSampleRate: 1.0,
+  sendDefaultPii: true,
+  transport: loggingTransport,
+  traceLifecycle: 'stream',
+});

dev-packages/node-integration-tests/suites/tracing/anthropic/scenario-streaming.mjs

@@ -0,0 +1,53 @@
+import Anthropic from '@anthropic-ai/sdk';
+import * as Sentry from '@sentry/node';
+import express from 'express';
+
+function startMockAnthropicServer() {
+  const app = express();
+  app.use(express.json({ limit: '10mb' }));
+
+  app.post('/anthropic/v1/messages', (req, res) => {
+    res.send({
+      id: 'msg_streaming_test',
+      type: 'message',
+      model: req.body.model,
+      role: 'assistant',
+      content: [{ type: 'text', text: 'Response' }],
+      stop_reason: 'end_turn',
+      stop_sequence: null,
+      usage: { input_tokens: 10, output_tokens: 5 },
+    });
+  });
+
+  return new Promise(resolve => {
+    const server = app.listen(0, () => {
+      resolve(server);
+    });
+  });
+}
+
+async function run() {
+  const server = await startMockAnthropicServer();
+
+  await Sentry.startSpan({ op: 'function', name: 'main' }, async () => {
+    const client = new Anthropic({
+      apiKey: 'mock-api-key',
+      baseURL: `http://localhost:${server.address().port}/anthropic`,
+    });
+
+    // Long content that would normally be truncated
+    const longContent = 'A'.repeat(50_000);
+    await client.messages.create({
+      model: 'claude-3-haiku-20240307',
+      max_tokens: 100,
+      messages: [{ role: 'user', content: longContent }],
+    });
+  });
+
+  // Flush is required when span streaming is enabled to ensure streamed spans are sent before the process exits
+  await Sentry.flush(2000);
+
+  server.close();
+}
+
+run();

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

@@ -844,4 +844,53 @@ describe('Anthropic integration', () => {
       });
     },
   );
+
+  const streamingLongContent = 'A'.repeat(50_000);
+
+  createEsmAndCjsTests(__dirname, 'scenario-streaming.mjs', 'instrument-streaming.mjs', (createRunner, test) => {
+    test('automatically disables truncation when span streaming is enabled', async () => {
+      await createRunner()
+        .expect({
+          span: container => {
+            const spans = container.items;
+
+            const expectedMessages = JSON.stringify([{ role: 'user', content: streamingLongContent }]);
+            const chatSpan = spans.find(
+              s => s.attributes?.[GEN_AI_INPUT_MESSAGES_ATTRIBUTE]?.value === expectedMessages,
+            );
+            expect(chatSpan).toBeDefined();
+          },
+        })
+        .start()
+        .completed();
+    });
+  });
+
+  createEsmAndCjsTests(
+    __dirname,
+    'scenario-streaming.mjs',
+    'instrument-streaming-with-truncation.mjs',
+    (createRunner, test) => {
+      test('respects explicit enableTruncation: true even when span streaming is enabled', async () => {
+        await createRunner()
+          .expect({
+            span: container => {
+              const spans = container.items;
+
+              // With explicit enableTruncation: true, content should be truncated despite streaming.
+              // Find the chat span by matching the start of the truncated content (the 'A' repeated messages).
+              const chatSpan = spans.find(s =>
+                s.attributes?.[GEN_AI_INPUT_MESSAGES_ATTRIBUTE]?.value?.startsWith('[{"role":"user","content":"AAAA'),
+              );
+              expect(chatSpan).toBeDefined();
+              expect(chatSpan!.attributes[GEN_AI_INPUT_MESSAGES_ATTRIBUTE].value.length).toBeLessThan(
+                streamingLongContent.length,
+              );
+            },
+          })
+          .start()
+          .completed();
+      });
+    },
+  );
 });

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

@@ -1,6 +1,8 @@
+import { getClient } from '../../currentScopes';
 import { captureException } from '../../exports';
 import { SEMANTIC_ATTRIBUTE_SENTRY_ORIGIN } from '../../semanticAttributes';
 import { SPAN_STATUS_ERROR } from '../../tracing';
+import { hasSpanStreamingEnabled } from '../../tracing/spans/hasSpanStreamingEnabled';
 import { startSpan, startSpanManual } from '../../tracing/trace';
 import type { Span, SpanAttributeValue } from '../../types-hoist/span';
 import {
@@ -206,7 +208,9 @@ function handleStreamingRequest<T extends unknown[], R>(
       originalResult = originalMethod.apply(context, args) as Promise<R>;
 
       if (options.recordInputs && params) {
-        addPrivateRequestAttributes(span, params, options.enableTruncation ?? true);
+        const client = getClient();
+        const enableTruncation = options.enableTruncation ?? !(client && hasSpanStreamingEnabled(client));
+        addPrivateRequestAttributes(span, params, enableTruncation);
       }
 
       return (async () => {
@@ -228,7 +232,9 @@ function handleStreamingRequest<T extends unknown[], R>(
     return startSpanManual(spanConfig, span => {
       try {
         if (options.recordInputs && params) {
-          addPrivateRequestAttributes(span, params, options.enableTruncation ?? true);
+          const client = getClient();
+          const enableTruncation = options.enableTruncation ?? !(client && hasSpanStreamingEnabled(client));
+          addPrivateRequestAttributes(span, params, enableTruncation);
         }
         const messageStream = target.apply(context, args);
         return instrumentMessageStream(messageStream, span, options.recordOutputs ?? false);
@@ -289,7 +295,9 @@ function instrumentMethod<T extends unknown[], R>(
           originalResult = target.apply(context, args) as Promise<R>;
 
           if (options.recordInputs && params) {
-            addPrivateRequestAttributes(span, params, options.enableTruncation ?? true);
+            const client = getClient();
+            const enableTruncation = options.enableTruncation ?? !(client && hasSpanStreamingEnabled(client));
+            addPrivateRequestAttributes(span, params, enableTruncation);
           }
 
           return originalResult.then(