LLM observability: tools for developers

Monitoring, traces, evaluation and quality tracking for LLM applications. An entry can appear under several use cases when its topics or description provide several explicit signals.

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123 entries in this view.

Tool ranking

Ranked by measured growth, normalized across sources. Raw values keep their source-specific window, shown under each tool; a change requires at least two snapshots from the last 7 days.

  1. 1

    Skill
    Active

    Open-source infrastructure that turns scattered SKILL.md files into curated, retrieval-ready agent-skill corpora—with retrieval and evaluation tooling included.

    PythonLicense: Apache-2.0
    • agent-memory
    • agent-skills
    • ai-agents
    • benchmark
    • dataset

    githubmeasured growthOpen source ↗

    Install git clone https://github.com/EverMind-AI/SkillCorpus ~/.claude/skills/SkillCorpus

    360GitHub stars+168 (+87.5 %)
  2. 2

    Skill
    Active

    Multi-tier framework for evaluating AI agent skills with quality gates, semantic overlap detection, synthetic evaluation dataset generation, and live agent evaluation that measures how skills affect agent behavior.

    PythonLicense: Apache-2.0
    • agent-evaluation
    • agent-security
    • agent-skills
    • agentic-ai
    • benchmark

    githubmeasured growthOpen source ↗

    Install git clone https://github.com/NVIDIA/SkillEvaluator ~/.claude/skills/SkillEvaluator

    363GitHub stars+58 (+19.0 %)
  3. 3

    Skill
    Active

    Research-backed, eval-driven skills for AI agents

    PythonLicense: Apache-2.0
    • agent-skills
    • ai-agents
    • codex
    • design
    • evals

    githubmeasured growthOpen source ↗

    Install git clone https://github.com/ZSeven-W/craft-skills ~/.claude/skills/craft-skills

    138GitHub stars+21 (+17.9 %)
  4. 4

    Skill
    Active

    Deletion-first Agent Skill for removing test bloat, verification theater, and speculative fallbacks while preserving behavior.

    PythonLicense: MIT
    • agent-skills
    • claude
    • claude-ai
    • claude-code
    • claude-skills

    githubmeasured growthOpen source ↗

    Install git clone https://github.com/MrZoyo/deslop-GPT ~/.claude/skills/deslop-GPT

    38GitHub stars+10 (+35.7 %)
  5. 5

    Other
    Active

    Test your prompts, agents, and RAGs. Red teaming/pentesting/vulnerability scanning for AI. Compare performance of GPT, Claude, Gemini, DeepSeek, and more. Simple declarative configs with command line and CI/CD integration. Used by OpenAI…

    TypeScriptLicense: MIT
    • ci
    • ci-cd
    • cicd
    • evaluation
    • evaluation-framework

    githubmeasured growthOpen source ↗

    24 710GitHub stars+137 (+0.56 %)
  6. 6

    Other
    Active

    Mastra is the modern TypeScript framework for AI-powered applications and agents.

    TypeScript
    • agents
    • ai
    • chatbots
    • evals
    • javascript

    githubmeasured growthOpen source ↗

    27 601GitHub stars+128 (+0.47 %)
  7. 7

    Other
    Active

    Open source observability platform for logs, metrics, traces, frontend monitoring, pipelines and LLM observability. A sophisticated, simple and highly performant alternative to Datadog, Splunk, and Elasticsearch with 140x lower storage…

    TypeScriptLicense: AGPL-3.0
    • analytics
    • apm
    • datadog
    • elasticsearch
    • grafana

    githubmeasured growthOpen source ↗

    21 594GitHub stars+119 (+0.55 %)
  8. 8

    Skill
    Active

    YAO = Yielding AI Outcomes. A rigorous engineering, evaluation, governance, and portability system for reusable agent skills.

    PythonLicense: MIT
    • agent-skills
    • ai-agents
    • evaluation
    • governance
    • meta-skill

    githubmeasured growthOpen source ↗

    Install git clone https://github.com/yaojingang/yao-meta-skill ~/.claude/skills/yao-meta-skill

    2 565GitHub stars+58 (+2.3 %)
  9. 9

    MCP
    Active

    A typed, replayable, budget-aware programming language for LLM agents. Compiles to Python & TypeScript.

    Shell
    • a2a
    • agent-framework
    • agentic-ai
    • ai
    • ai-agents

    githubmeasured growthOpen source ↗

    2GitHub stars+1 (+100.0 %)
  10. 10

    Skill
    Active

    Production patterns for agent orchestrators, harnesses, evals, MCP/A2A interoperability, memory, provider routing, and LLM usage metering.

    PythonLicense: MIT
    • a2a
    • agent-orchestration
    • agent-skills
    • ai-agents
    • developer-tools

    githubmeasured growthOpen source ↗

    Install git clone https://github.com/ssheleg/agent-stack ~/.claude/skills/agent-stack

    2GitHub stars+1 (+100.0 %)
  11. 11

    Agent
    Active

    A local A2A event and continuity service for agent applications, with structured history, provenance-safe transcripts, literal search, and natural-language queries.

    PythonLicense: BSD-2-Clause
    • a2a
    • agent-memory
    • ai-agents
    • event-sourcing
    • fastapi

    githubmeasured growthOpen source ↗

    1GitHub stars+1
  12. 12

    Agent
    Active

    The Operating System for Scalable Enterprise AI Agents - Run, orchestrate, and deploy Compliant Enterprise AI Agents at scale across frameworks, without lock-in, rewrites or fragile glue code. Native support for MCP, A2A. Interface with all…

    PythonLicense: Apache-2.0
    • a2a
    • adk
    • ai-agents
    • aws
    • azure

    githubmeasured growthOpen source ↗

    146GitHub stars+13 (+9.8 %)
  13. 13

    Agent
    Active

    The open source AI engineering platform for agents, LLMs, and ML models. MLflow enables teams of all sizes to debug, evaluate, monitor, and optimize production-quality AI applications while controlling costs and managing access to models…

    PythonLicense: Apache-2.0
    • agentops
    • agents
    • ai
    • ai-governance
    • apache-spark

    githubmeasured growthOpen source ↗

    27 759GitHub stars+78 (+0.28 %)
  14. 14

    Agent
    Active

    DataBuff is an AI-native APM built on Opentelemetry，with multi-agent troubleshooting out of the box.

    JavaLicense: AGPL-3.0
    • aiops
    • apm
    • application-monitoring
    • devops
    • distributed-tracing

    githubmeasured growthOpen source ↗

    627GitHub stars+22 (+3.6 %)
  15. 15

    Other
    Active

    The fastest path to AI-powered full stack observability, even for lean teams.

    GoLicense: GPL-3.0
    • ai
    • alerting
    • cncf
    • data-visualization
    • database

    githubmeasured growthOpen source ↗

    80 382GitHub stars+80 (+0.10 %)
  16. 16

    Library
    Active

    Prefect is a workflow orchestration framework for building resilient data pipelines in Python.

    PythonLicense: Apache-2.0
    • automation
    • data
    • data-engineering
    • data-ops
    • data-science

    githubmeasured growthOpen source ↗

    23 741GitHub stars+55 (+0.23 %)
  17. 17

    Other
    Active

    the LLM vulnerability scanner

    PythonLicense: Apache-2.0
    • ai
    • llm-evaluation
    • llm-security
    • security-scanners
    • vulnerability-assessment

    githubmeasured growthOpen source ↗

    9 079GitHub stars+46 (+0.51 %)
  18. 18

    Skill
    Active

    Build tested agent skills and govern their lifecycle through a user-defined marketplace: evidence, discovery, updates, rollback, quarantine, and 17-platform distribution.

    PythonLicense: MIT
    • agent-skills
    • ai-agents
    • claude-code
    • codex
    • cursor

    githubmeasured growthOpen source ↗

    Install git clone https://github.com/FrancyJGLisboa/agent-skill-creator ~/.claude/skills/agent-skill-creator

    2 358GitHub stars+29 (+1.2 %)
  19. 19

    Other
    Active

    SigNoz is an open-source, OpenTelemetry-native observability platform for your team and their AI agents. Get logs, metrics, and traces in one tool with features like APM, distributed tracing, log management, infra monitoring, etc. Combined…

    TypeScript
    • apm
    • application-monitoring
    • distributed-tracing
    • go
    • good-first-issue

    githubmeasured growthOpen source ↗

    31 983GitHub stars+48 (+0.15 %)
  20. 20

    Other
    Active

    A high-performance observability data pipeline.

    RustLicense: MPL-2.0
    • agent
    • cloud-native
    • data-transformation
    • datadog
    • etl

    githubmeasured growthOpen source ↗

    22 497GitHub stars+41 (+0.18 %)
  21. 21

    MCP
    Active

    A Go framework for building production agent systems with graph workflows, tools, memory, A2A, AG-UI, MCP, evaluation, and observability.

    GoLicense: Apache-2.0
    • a2a
    • a2a-protocol
    • ag-ui
    • agent
    • agent-framework

    githubmeasured growthOpen source ↗

    1 752GitHub stars+22 (+1.3 %)
  22. 22

    Skill
    Active

    The Fable Workflow: how Claude Fable 5 worked, distilled into skills any model can run, with the eval that keeps it honest. Think / act / prove.

    PythonLicense: MIT
    • agent-skills
    • ai-agents
    • claude
    • claude-code
    • claude-md

    githubmeasured growthOpen source ↗

    Install git clone https://github.com/Sahir619/fable-method ~/.claude/skills/fable-method

    2 269GitHub stars+22 (+0.98 %)
  23. 23

    Agent
    Active

    Amazon Bedrock AgentCore enterprise platform accelerator with AWS CDK, Terraform organization guardrails, MCP/A2A agents, security, memory, and observability.

    PythonLicense: Apache-2.0
    • a2a-protocol
    • agentcore
    • agentcore-agent
    • agentcore-gateway
    • agentcore-identity

    githubmeasured growthOpen source ↗

    5GitHub stars+1 (+25.0 %)
  24. 24

    MCP
    Dormant

    Open-source Python framework to deploy AI agents via HTTP, A2A, and MCP with built-in observability

    PythonLicense: MIT
    • a2a
    • a2a-client
    • a2a-server
    • agent-evaluation
    • agentic-ai

    githubmeasured growthOpen source ↗

    5GitHub stars+1 (+25.0 %)
  25. 25

    MCP
    Active

    🫖 Status page with uptime monitoring & API monitoring as code 🫖

    TypeScriptLicense: AGPL-3.0
    • alerting
    • incident-management
    • mcp
    • mcp-server
    • monitoring

    githubmeasured growthOpen source ↗

    9 045GitHub stars+28 (+0.31 %)