# t-bench

Published articles for t-bench.

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## Why Agent Observability Cannot Replace Evaluation

DevFeed: [Why Agent Observability Cannot Replace Evaluation](<https://devfeed.tech/articles/why-agent-observability-cannot-replace-evaluation-63009.md>)

Original publisher: [Read original article](<https://hackernoon.com/your-agent-has-observability-it-doesnt-have-evals?source=rss>)

Author: JasonL

Published: 2026-09-30T18:16:38Z

Content type: opinion

Language: en

Sources: [HackerNoon](<https://devfeed.tech/sources/hackernoon.md>)

Topics: [observability](<https://devfeed.tech/topics/observability.md>), [agent observability](<https://devfeed.tech/topics/agent-observability.md>), [LLM observability](<https://devfeed.tech/topics/llm-observability.md>)

Tags: [agent-observability](<https://devfeed.tech/tags/agent-observability.md>), [agent-tracing](<https://devfeed.tech/tags/agent-tracing.md>), [ai-agent-observability](<https://devfeed.tech/tags/ai-agent-observability.md>), [ai-reliability](<https://devfeed.tech/tags/ai-reliability.md>), [evaluation](<https://devfeed.tech/tags/evaluation.md>), [langchain](<https://devfeed.tech/tags/langchain.md>), [llm-as-a-judge](<https://devfeed.tech/tags/llm-as-a-judge.md>), [llm-evaluation](<https://devfeed.tech/tags/llm-evaluation.md>), [observability](<https://devfeed.tech/tags/observability.md>), [opentelemetry](<https://devfeed.tech/tags/opentelemetry.md>), [regression-testing](<https://devfeed.tech/tags/regression-testing.md>), [t-bench](<https://devfeed.tech/tags/t-bench.md>)

### AI overview

The article argues that agent observability and evaluation measure different things: traces show what an agent did, while evaluations assess whether its behavior was correct. It cites a LangChain survey showing observability is common but evaluation adoption is lower.

### Source excerpt

LangChain surveyed 1,340 practitioners: 89% have agent observability, 52.4% run offline evals, and fewer than a third do both. Traces tell you what an agent did