By Tom Morgan · Reviewed 2 November 2026 · 15-minute read Rebuilt on 2 November 2026. The first version of this post pinned a set of Replit figures on the wrong source, linked to OpenTelemetry pages that have since turned into redirects, and had no trace you could reproduce yourself. This version fixes all three, … Read more
The short answer: if you can run a service, start with Langfuse or Arize Phoenix. If you build on LangGraph, LangSmith is the lowest-friction choice. If your company already pays for Datadog, use Datadog. If your biggest fear is a release that quietly makes the agent worse, look hard at Braintrust. Don’t pick Helicone for … Read more
By Tom Morgan · Updated 2 November 2026 The short answer AI agent observability is the ability to reconstruct, step by step, what an AI agent did during a task: what it was asked, what it looked at, which tools it called, what came back, what it decided next, and what that cost. It lets … Read more