THE 2026 GUIDE TO AGENT OBSERVABILITY TOOLS

Summary from the TLDR Data newsletter

Agent observability has moved from nice-to-have to a production requirement: Monte Carlo cites 73% of enterprises refusing to ship agents without monitoring and alerting, and 53% expecting major redesigns after deployment. The guide separates tracing-first, eval-first, gateway, and platform approaches, but highlights a persistent blind spot: most tools observe the agent while missing upstream data freshness, lineage, and quality failures.