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2026-08-17 12 min read backend

Why Sentry Was Dropping generationConfig on Gemini Chat Spans (and How I Patched It)

A debugging walkthrough of how Sentry's googleGenAIIntegration silently dropped temperature and model config on Gemini chat spans, and the fix.

SentryGemini APIJavaScript SDKObservabilityOpenTelemetryDebuggingNode.js
Why Sentry Was Dropping generationConfig on Gemini Chat Spans (and How I Patched It)

Table of Contents

  • How Sentry actually instruments the Google GenAI SDK
  • Where the chat's generationConfig actually lives
  • Tracing it through the instrumentation code
  • The fix, and what it cost us
  • Verifying the fix actually held
  • What I'd check if you're seeing the same thing
  • Closing thoughts

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