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judgeval

Python SDK for tracing agents and scoring their traces with prompt-based judges, to find failures in production.

Harness by JudgmentLabs

IndexedApache-2.0★ 1,070
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Install

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pip install judgeval

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About

Judgeval is an open-source Python SDK for agent improvement. It provides OpenTelemetry-based tracing through a decorator, prompt-based judges that label traces, and online monitoring that scores live traffic with optional Slack alerts. It auto-instruments OpenAI, Anthropic, Google GenAI and Together AI, supports LangGraph, OpenLit and Claude Agent SDK, and offers a read-only SQL interface over telemetry tables.

Use cases: monitoring-observability, llm-evaluation

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Fact sheet

Languages
PythonREADME
Packages
judgeval (pypi)README
Observability
OpenTelemetryREADME
Model providers
openai, anthropic, google, togetherREADME
Maturity
Stablegithub.com

Facts extracted by Claude Haiku 5.5 from the linked sources on Oct 24, 2026. Wrong fact? Tell us.

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Signals

Stars
1,070
Forks
104
Open issues
17
Weekly downloads
77,683
Last commit
Oct 23, 2026 (8 days ago)
Last release
Oct 21, 2026 (9 days ago)
Last package publish
Oct 21, 2026 (9 days ago)

From GitHub (fetched Oct 24, 2026) and the package registry.

Details

Packages
pypi judgeval
License
Apache-2.0
First seen
Oct 24, 2026
Last checked
Oct 24, 2026

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Cite this page

judgeval. Agent Mart. https://agentmart.dev/harnesses/judgeval (last updated 2026-10-24)