$ find your agent harness

Open-source (Rust, BSD-3) Codex-native personal agent platform whose defining trait is a hardware-isolated microVM per agent — Firecracker on Linux, Hyper-V on Windows, not just a container — wrapped in zero-trust controls: 'Pipelock' keeps secrets and credentials out of an agent's reach and an egress-allowlist proxy governs outbound traffic. Agents are authored, validated and launched entirely from Codex in-repo ('everything is a skill'), build their own capability-gated WASM tools at runtime, persist memory in a shared knowledge graph, and can run always-on via cron-style schedules and heartbeats.

The original 'AI software engineer': a cloud VM agent that plans, codes, tests and opens PRs from Slack/web/API, now spanning a whole product line (Devin cloud, Devin Desktop nee Windsurf, CLI) with ACU consumption billing ($2.00-2.25/ACU, Core $20 entry, Team $500/mo) and Cognition's own SWE-1.6 model alongside frontier models.

Google's asynchronous coding agent that clones your GitHub repo into a secure cloud VM, plans and executes tasks (bug fixes, tests) and returns PRs; free tier of 15 tasks/day with higher quotas bundled into Google AI Pro/Ultra, Gemini 3.1 Pro/3 Flash under the hood, curated MCP connections (Linear, Supabase, Neon, Context7) added Feb 2026 and an alpha REST API for Slack/Linear-driven automation.