AI Agent Ecosystem

Harnesses Landscape

3 min read

Commercial / Proprietary

  • Claude Code (Anthropic)
  • Codex (OpenAI)
  • Cursor (Anysphere)
    • Since Cursor 3 (April 2026), an agent-fleet workspace rather than an IDE with AI. Has an ADE mode (see How on Agent Harnesses)
  • Antigravity (Google)
    • Antigravity CLI is the terminal counterpart, sharing the desktop app’s agent harness. It succeeded Gemini CLI for individual users (see Legacy)
  • GitHub Copilot
  • Devin / Devin Desktop (Cognition)
    • Formerly Windsurf (see Legacy)
    • Agent Command Center is its fleet-management mode, an ADE mode
  • Amazon Q Developer
    • IDE plugins and paid subscriptions reach end of support April 30, 2027, and new signups have been blocked since May 15, 2026. Kiro is the named successor
    • Listed here rather than in Legacy until the sunset completes; existing users are still supported
  • Kiro (Amazon)
    • Named successor to Amazon Q Developer’s IDE plugins
  • Warp
    • Coined “Agentic Development Environment” (ADE) with Warp 2.0, June 2025
    • Now three products: Warp Terminal (the original harness), Warp Agent CLI (a standalone coding agent for any terminal), and Warp Factories (fleet orchestration across the SDLC; a separate product, listed under §13 Agent Operations and Deployment)
  • Zencoder
    • Zenflow is its multi-agent orchestration mode: Plan → Implement → Test → Review workflows, with one model checking another’s work. An ADE mode
  • Zed
    • Rust-native, GPU-rendered code editor. The Zed AI service and collaboration backend are proprietary; the editor core is open source (see Open Source)
  • Perplexity Computer
    • General-purpose agent worker rather than a coding tool: splits a goal into subtasks run by sub-agents on models from several providers
    • Also sold as Personal Computer, which runs on a dedicated local Mac or Windows machine, and Portable Computer, a fully local edition built with NVIDIA

Open Source / Provider-agnostic

  • OpenCode (Anomaly)
  • OpenWorker (Andrew Ng)
  • Crush (Charm)
  • Pi (Mario Zechner)
    • The repository and npm packages now live under the Earendil Works organization on GitHub
  • Hermes Agent (Nous Research)
    • Distinct from the Hermes model line (§4 Models)
  • Aider (Paul Gauthier)
  • Cline (Saoud Rizwan)
  • Oh My Pi (can1357)
    • Rust-powered, tool-dense fork of Pi
  • OpenHands (All Hands AI)
  • Goose (Block)
  • Zed
    • GPL-3.0 editor core, with local models via Ollama. Commercial layer under the same brand (see Commercial)
    • A host editor for the Agent Client Protocol (§8): external agents such as Claude Agent, Codex, and OpenCode dock into it

Legacy / Decommissioned

  • Windsurf (Cognition)
    • Rebranded Devin Desktop, June 2, 2026
  • Cascade (Cognition)
    • Windsurf’s original agent, replaced by Devin Local in the same rebrand
  • Continue
    • Acqui-hired by Cursor (Anysphere), announced mid-June 2026. The final release (v2.0.0) shipped June 19, 2026, with no product releases since. Code remains Apache 2.0 and forkable
  • Gemini CLI (Google)
    • Stopped serving free, Pro, and Ultra individual accounts June 18, 2026; enterprise Gemini Code Assist licenses are unaffected. Succeeded by Antigravity CLI. Code remains Apache 2.0
  • Mods (Charm)
    • CLI for piping command output through an LLM, with MCP tool-calling. Sunset March 9, 2026, in favor of Crush’s non-interactive mode (crush run). Code remains MIT and forkable

Graph View