Startup
Giskard
Open-source evals, red teaming and test generation for agentic systems.
Giskard builds an open-source (Apache-2.0) Python library for testing and evaluating agentic systems, alongside a commercial AI red-teaming and LLM security platform. Giskard v3 is a modular rewrite for dynamic, multi-turn agent testing: Giskard Checks for evals from simple assertions to LLM-as-judge, and giskard-scan for vulnerability scanning and RAG evaluation, built on giskard-core, giskard-llm and giskard-agents. It can wrap an LLM, a black-box agent or a multi-step pipeline. v2 remains available but is no longer actively maintained.
People
Co-founder
Harness engineering
Co-founder
Harness engineering
Neighbours in the directory
San Francisco, CA · Est. 2022
The de-facto standard toolkit for building LLM applications and agents.
LangChain makes the LangChain framework and LangGraph, the low-level orchestration standard for stateful, controllable agents, plus the LangSmith platform for tracing, evaluating and monitoring them in production.
~$75M raised
San Francisco, CA · Est. 2023
Enterprise-grade evals, data and AI gateway.
Braintrust turns prompts and agent traces into testable datasets and CI, plus an inference gateway — helping teams measure whether harness changes actually improve agent quality.
Berkeley, CA · Est. 2020
Observability and evaluation for AI — makers of OSS Phoenix.
Arize traces and evaluates LLM and agent systems in production; their open-source Phoenix tracer is a common instrumentation choice for agent harnesses that need to be debuggable.
Connections
Relations from the Harness Hub knowledge graph, as charted in the State of Harness reports.
Sources
Verified Oct 29, 2026