The request names no specific product, so it is answered with tools that evaluate LLM outputs with an LLM-as-judge: Arize-oriented evaluator skills on GitHub 111, Langfuse 212, Iris 3, and MLflow 414. Promptfoo 919 and CompletionKit 6 also score outputs with LLM judges and are candidates if a prompt-testing focus is wanted.
- 1
Langfuselangfuse.comverified and signed
Open-source LLM engineering platform for tracing, prompt management and evaluation, with an llm-as-a-judge evaluation skill 12.
+29 community tools built for it
for agents: llm-as-a-judge · langfuse · evaluation
- 2
MLflowmlflow.orgverified and signed
Open-source AI platform offering systematic evaluation of agents and LLM applications, with skills that evaluate and improve agent output quality 14.
+6 community tools built for it
for agents: agent-evaluation · mlflow · mlflow
- 3
GitHubgithub.comverified and signed
Developer platform whose arize-evaluator skill runs LLM-as-judge evaluation workflows on Arize, including creating evaluators and running them on spans or experiments 11.
official:CLI · github-mcp-serverskill · add-community-extensionskill · git-commitskill · acquire-codebase-knowledge+2,563 community tools built for it
for agents: arize-evaluator · agentic-eval · phoenix-evals
- 4
Irisiris-eval.comfound in code, not yet checked
Self-hosted agent quality gate that scores output quality with an LLM judge via evaluate_with_llm_judge and detects PII and injection attacks 3.
for agents: evaluate_with_llm_judge · evaluate_output · evaluate_runs
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Sources
- 1GitHub · Change is constant. GitHub keeps you ahead. · GitHub · GitHubgithub.com · read 2026-10-29
- 2Langfuse: Open Source Agent Evals & Observabilitylangfuse.com · read 2026-10-29
- 3Iris — stop shipping agents on vibesiris-eval.com · read 2026-10-29
- 4MLflow - Open Source AI Platform for Agents, LLMs & Modelsmlflow.org · read 2026-10-29
- 6CompletionKit: test and improve your AI appcompletionkit.com · read 2026-10-29
- 9Build Secure AI Applications | Promptfoopromptfoo.dev · read 2026-10-29
- 11arize-evaluator: declares "arize-evaluator" (the record we read and signed)unfragile.ai · read 2026-10-24
- 12langfuse: declares "llm-as-a-judge" (the record we read and signed)unfragile.ai · read 2026-10-24
- 14agent-evaluation: declares "agent-evaluation" (the record we read and signed)unfragile.ai · read 2026-10-24
- 19promptfoo: declares "get_evaluation_details" (the record we read)github.com · read 2026-10-24
For agents: the 10 actions behind this answer
arize-evaluator · arize-evaluator verified and signed
Handles LLM-as-judge evaluation workflows on Arize including creating/updating evaluators, running evaluations on spans or experiments, managing tasks, trigger-run operations, column mapping, and continuous monitoring. Use when the user mentions create evaluator, LLM judge, hallucination, faithfulne
llm-as-a-judge · langfuse verified and signed
evaluate_with_llm_judge · iris-eval/mcp-server found in code, not yet checked
agent-evaluation · agent-evaluation verified and signed
Use this when you need to EVALUATE OR IMPROVE or OPTIMIZE an existing LLM agent's output quality - including improving tool selection accuracy, answer quality, reducing costs, or fixing issues where the agent gives wrong/incomplete responses. Evaluates agents systematically using MLflow evaluation w
adk-eval-guide · adk-eval-guide verified and signed
MUST READ before running any ADK evaluation. ADK evaluation methodology — eval metrics, evalset schema, LLM-as-judge, tool trajectory scoring, and common failure causes. Use when evaluating agent quality, running adk eval, or debugging eval results. Do NOT use for API code patterns (use adk-cheatshe
· CompletionKit website read, tools not yet checked
Prompt evaluation for AI apps. Run prompts against real inputs, score outputs 1-5 with an LLM judge, ship only what improved. Free on Cloud, or self-host.
· Ollama website read, tools not yet checked
Ollama is the easiest way to run and build with open AI models locally or in the cloud on macOS, Windows, and Linux.
add · mcp-evals verified and signed
mlflow · mlflow-skinny verified and signed
get_evaluation_details · promptfoo found in code, not yet checked
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.