---
showArticleList: false
title: Harnesses
created: 2026-09-24
visible: true
status: in progress
tags: [agents, harnesses]
readability: 3
---

The terminal and CLI agents that carry the model into your repository: the platform benchmarks, the provider entrants, and the minimal, self-extensible, and foundation-governed outliers.

- [aider](aider/index.md) - the pre-agentic BYOK pair-programmer, cheapest precise-edit tool, development stalled since May 2026.
- [Amp](amp/index.md) - Sourcegraph-spun-out agent whose orbs keep working after you close the laptop, free on your own compute, subscriptions, or keys since September 13.
- [Ante](ante/index.md) - Antigma Labs' ~15MB Rust harness with an embedded llama.cpp engine, offline GGUF or 12+ cloud providers, footprint as the product.
- [Bullet](bullet/index.md) - TryBullet's closed-source YC S26 latency bet, free today, with a published 479-of-500 SWE-bench run.
- [Claude Code](claude-code/index.md) - Anthropic's everywhere-at-once harness, the platform benchmark and the token-cost cautionary tale.
- [Cline](cline/index.md) - the open-source agent that outgrew its VS Code extension into CLI, kanban, and SDK, 5.3 million installs deep.
- [Codex](codex/index.md) - OpenAI's ChatGPT-included agent, the Apache-2.0 big-lab CLI individuals can still just run.
- [Crush](crush/index.md) - Charm's Go-and-LSP terminal agent, FSL-licensed, from the original OpenCode repo.
- [DeepSeek Harness](deepseek-harness/index.md) - DeepSeek's everything-is-a-plugin harness, 228k stars in its first two months, MIT, prerelease-only at v0.1.6-alpha.2.
- [Exo](exo/index.md) - the MIT self-modification bet, a harness the agent can rewrite at runtime, cheapest measured harness at $1.05 per task.
- [fx](fx/index.md) - Vercel Labs' ~6 MiB Zig harness built to be embedded, the first agent-as-a-dependency bet.
- [Gemini CLI](gemini-cli/index.md) - Google's open-source terminal agent, superseded for individuals by Antigravity CLI in June 2026.
- [goose](goose/index.md) - Block's Rust agent turned Linux Foundation project, the field's first foundation-governed harness.
- [Grok Build](grok-build/index.md) - SpaceXAI's Apache-2.0 Rust TUI agent, open-sourced to a 590-point thread, daily releases synced from the monorepo, the wire-level privacy analysis attached.
- [jcode](jcode/index.md) - Solo Systems' Rust harness for parallel agents, RAM floor, native memory and swarm, self-dev included.
- [Juggler](juggler/index.md) - Julian Storer's AGPL Go GUI agent, conversations as branchable trees with every tool call inspectable.
- [Junie](junie/index.md) - JetBrains' plan-first agent with BYOK, IDE-grade grounding, and a free on-device Local mode for Mac.
- [Kilo Code](kilo-code/index.md) - the Cline-and-Roo feature-merge under MIT, subagents through cloud tasks bundled in, Anaconda's since July 2026.
- [Kimi Code](kimi-code/index.md) - Moonshot AI's terminal agent tuned for its own challenger-priced models, subagents through ACP in one Node.js CLI.
- [OneCLI](onecli/index.md) - the YC S26 Apache-2.0 team harness where a credential gateway injects secrets per request, so agents never hold them.
- [OpenCode](opencode/index.md) - the MIT, provider-neutral harness with the leanest measured token baseline.
- [OpenHands](openhands/index.md) - the renamed OpenDevin platform bet, sandboxed code-shell-browser agents you can self-host.
- [Pi](pi/index.md) - Earendil's minimal, self-extensible harness, a frozen core plus your TypeScript extensions, no MCP by design.
- [Qwen Code](qwen-code/index.md) - Alibaba's Gemini CLI fork and open-weights showcase, its OAuth free tier discontinued April 2026.
- [Warp Agent CLI](warp-agent-cli/index.md) - Warp's terminal agent unbundled into any terminal, model routing, cloud agents, and orchestration behind its credit meter.
- [ZCode](zcode/index.md) - Z.ai's official GLM workbench, caught silently uploading whole workspaces in September 2026 and open-sourced three days later as a flattened dump.
- [Zerostack](zerostack/index.md) - the solo GPL-3.0 Rust agent, 26 MB binary and ~16 MB RAM, subagents, worktrees, hooks, MCP behind compile flags.

Its members are compared on shared rows in the [Harness Feature Matrix](harness-feature-matrix/index.md).

## Changes

- 2026-08-22 - Added aider.
- 2026-08-22 - Added Amp.
- 2026-08-22 - Added Claude Code.
- 2026-08-22 - Added Codex.
- 2026-08-22 - Added Crush.
- 2026-08-22 - Added Gemini CLI.
- 2026-08-22 - Added Junie.
- 2026-08-22 - Added OpenCode.
- 2026-08-24 - Added Cline.
- 2026-08-24 - Added goose.
- 2026-08-24 - Added Qwen Code.
- 2026-08-27 - Added Kilo Code.
- 2026-08-27 - Added OpenHands.
- 2026-08-29 - Added fx.
- 2026-08-30 - Added Ante.
- 2026-08-30 - Added Bullet.
- 2026-08-30 - Added DeepSeek Harness.
- 2026-08-30 - Added jcode.
- 2026-08-30 - Added Juggler.
- 2026-08-30 - Added OneCLI.
- 2026-08-30 - Added Pi.
- 2026-08-30 - Added Warp Agent CLI.
- 2026-08-30 - Added Zerostack.
- 2026-09-05 - Added Exo.
- 2026-09-05 - Added Kimi Code.
- 2026-09-12 - Added Grok Build.
- 2026-09-21 - Added ZCode.