TruLens

Open-source, OpenTelemetry-native evals and tracing for AI agents

Observability tool by Snowflake

IndexedMIT★ 3,609

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About

TruLens records latency, inputs, outputs, tokens and cost for each step of an agent run. Judges score each step and explain their scores, and app versions can be compared on score, latency and cost. Tracing is built on OpenTelemetry, so traces can be exported to any OTLP-compatible backend.

Use cases: llm-evaluation, monitoring-observability

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Fact sheet

Category: Evals · open source
Open source: Yestrulens.org
Works with: langchain, llamaindex, langgraph, openai-agents-sdktrulens.org
Protocols: opentelemetrytrulens.org

Facts read from the vendor's own pages by claude-haiku-5-5 on Oct 24, 2026; a fact is shown only with the page it came from.

Signals

Stars: 3,609
Forks: 374
Open issues: 53
Last commit: Oct 24, 2026 (6 days ago)
Last release: Oct 19, 2026 (11 days ago)

From GitHub (fetched Oct 24, 2026).

Details

Packages: pypi trulens
License: MIT
Repository: github.com/truera/trulens
Website: www.trulens.org
Docs: www.trulens.org/getting_started/
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: Website Docs README github-graphql

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Cite this page

TruLens. Agent Mart. https://agentmart.dev/observability/trulens (last updated 2026-10-24)