A curated, verified, cross-vendor directory of AI agent harnesses — the runtime scaffolding that turns a model into an agent.
◆ 74 harnesses profiled · 9-axis capability schema · last verified 2026-07-08
An early (2023-era) open-source background agent that turned labeled GitHub issues into pull requests by planning, coding and opening a PR asynchronously; the original bot is effectively sunset — the repo README redirects to the company's pivot into a proprietary JetBrains AI plugin (autocomplete + in-IDE agent, $10-60/mo) using Sweep's own LLMs, so the background-agent product itself is legacy.
Launched GA June 30 2026, these are pipeline-native reasoning agents for the software-delivery stage (between code and production) rather than code authoring: every pipeline step can run as an agent governed by existing enterprise deployment controls, with an LLM Gateway enforcing policy on prompts, distinct auditable AI identities, per-agent/per-pipeline model switching, and a marketplace of Harness-managed and community agents.