HARNESS HUB
104 harnesses
Find the right harness for the job.
Native harnesses, coding agents, ACP routes, optional runtimes and model presets, with runtime, setup, provenance and licence shown up front. The same catalogue is browsable in the terminal with :hub.
ManagedDrive OpenAI Codex with your ChatGPT/Codex login (~/.codex)
ManagedCompatibility route for the Anthropic API-key runtime; prefer BYOK
ManagedUse Cursor Agent over ACP through the account already signed in to Cursor CLI
ManagedUse your Copilot plan; prefers the SDK for per-tool approvals and resumable sessions, otherwise uses the official CLI directly
ManagedUse Google's Antigravity agent with your Google Sign-In
ACPGoogle's Gemini CLI ACP implementation. Consumer Google AI Pro/Ultra/free Code Assist users should migrate to Antigravity CLI; enterprise/API-key ACP users can keep this route.
ACPThe AI coding agent built for the terminal with client/server architecture and ACP support via adapter.
Integration pendingZ.AI's official desktop coding harness for GLM-5.3, with its own agent loop, tools, review flow, browser automation, and long-horizon task experience.
Integration pendingAn MIT-licensed terminal coding harness written in Rust, focused on low memory use, fast start, and parallel agent swarms.
Integration pendingWarp's AGPL-3.0 Agent CLI, the same harness as Warp Terminal, runnable in any terminal with a Warp account or WARP_API_KEY.
Integration pendingLetta's Apache-2.0 memory-first coding harness. Agents keep identity and learn across sessions through the `letta` CLI, desktop app, or Letta Cloud.
Integration pendingLaude Institute's Apache-2.0 agent microharness (<10K lines of Bash) built around shellm, a recursive-language-model (RLM) core, for persistent agents that keep thinking between messages.
ManagedGrok Build coding agent on your X/SuperGrok login (xAI's own harness, over ACP). Headless vendor loop: :runtime grok-cli. SuperQode harness on the same plan: :grok api
Moonshot AI's first-party coding agent through its official ACP server
QwenLM's first-party open-source coding agent through its stable ACP mode
Cognition's Devin CLI on your Devin account, through its native ACP server
ManagedUse Factory Droid through its locally authenticated CLI and ACP mode
ACPGoose is a developer tool that helps you write code faster by automating repetitive tasks.
ACPAI coding agent platform by All-Hands-AI with ACP support.
ManagedUse a Kiro or Amazon Q Developer plan over ACP through Kiro CLI sign-in
ManagedPrime Intellect's RLM coding agent hosted by prime-agent-python-client, on a subscription provider or local model. ACP remains available from :connect acp prime-agent
ManagedLangChain's MIT-licensed terminal coding agent over its own ACP server
ManagedUse Vercel Labs' experimental fx agent over ACP through the account signed in with `fx login`. Models are billed as Vercel AI Gateway credits
IncludedLean native coding harness with read, write, edit, and bash.
IncludedFeature-rich native coding harness with the full workbench toolset.
IncludedEvent-first loop, parallel tools, session tree, pure host permissions.
IncludedBuilt-in recursive coding harness: one persistent Python tool, child agents, and a kernel that runs on the host, in Docker, or under Pydantic Monty.
OptionalLangChain DeepAgents coding harness over the DeepAgents SDK; DeepAgents owns the graph, filesystem backend, and subagents.
IncludedModel-only reasoning harness with no tools or repository access.
Use a paid GLM Coding Plan through its authenticated ACP agent
JetBrains Junie through its CLI and ACP server on your JetBrains AI account
ManagedUse Meta's Muse Code agent with your Meta account sign-in
ACPAI coding agent by Ampcode. Works in any codebase with full ACP support via acp-amp adapter.
ACPAn AI agent that brings Augment Code's power to the terminal with ACP support for Zed, Neovim, and Emacs.
ACPAI-native multi-agent development platform (Kotlin Multiplatform) with ACP and A2A support.
AI coding assistant with terminal CLI, multi-provider support and ACP.
ACPA powerful, easy-to-use, customizable multi-agent runtime that orchestrates AI agents.
ACPUnleash Claude's raw power directly in your terminal. Search million-line codebases instantly.
ACPAn AI coding assistant built in Rust for autonomous code analysis and modification.
Tencent Cloud's CodeBuddy terminal coding agent with ACP support.
ACPOpenAI's code generation agent with streaming terminal output and community adapters.
Snowflake's Cortex Code terminal agent through its native ACP server.
ACPLangChain's MIT-licensed terminal coding agent, built on the Deep Agents SDK, with persistent memory, skills, subagents, and approval controls.
ACPLangChain's general-purpose and coding agent exposed through its ACP package.
Cognition's Devin CLI coding agent, connected through its native ACP server.
Open-source coding agent focused on efficient parallel edits and lower model cost.
ACPCreate and interact with sophisticated Agents and Workflows in minutes. MCP native.
ACPVercel Labs' experimental native coding agent. SuperQode starts its ACP server with fx acp. Models are billed as Vercel AI Gateway credits.
ACPAI coding assistant with ACP support in public preview.
Community ACP coding agent using GLM models as its reasoning engine.
ACPxAI's official Grok Build coding agent, connected through its native ACP server.
ACPAgent pipeline runtime that serves .harn workflows as a native ACP coding agent.
ACPOpen-source coding agent by Nous Research with ACP support.
ACPJetBrains' AI agent with ACP support across their entire IDE ecosystem.
ACPOpen-source coding agent with a terminal CLI, broad model support, and native ACP mode.
Moonshot AI's first-party open-source coding agent with a native ACP server.
ACPAgentic coding CLI with full ACP support for editor integration.
ACPA framework for creating and managing LLM-powered agents to provide structured interactions.
OpenClaw ACP-compatible agent listed by the official Agent Client Protocol documentation.
ACPSelf-improving RLM agent for coding and long-running autonomous tasks. A persistent IPython kernel is the single model-facing tool.
ACPAn ACP-compatible agent focused on providing comprehensive code assistance and collaboration features.
ACPACP-compatible tool bus for connecting AI agents to development tools.
ACPA versatile coding agent implementing ACP for seamless integration with compatible development environments.
DeepSeek Harness coding agent hosted over JSON-RPC; DeepSeek owns the loop, tools, and sandbox.
OptionalHugging Face Tau event-first agent in read-only preview mode; sessions and progress remain visible in SuperQode.
OptionalA harness on a Unified Harness Protocol server; the server runs the agent and SuperQode streams its progress, files, and result.
PresetAutonomous coding harness for headless benchmark runs: never asks the user, investigates exhaustively, always attempts and verifies a fix.
PresetDS4 local coding harness tuned for compact JSON tool calls.
PresetCompact DS4 coding harness for fast local iteration.
PresetGemma4 local coding harness tuned for strict JSON tool calls.
PresetGemma4 local reasoning harness with no repository tools.
PresetGLM local/endpoint coding harness: strong agentic coder, native tools.
PresetGLM-5.2 long-horizon coding harness via the first-party Z.AI general API.
PresetStable Kimi-family coding harness with long context, max reasoning, native tools, and cache-friendly extended history.
PresetKimi K3 long-horizon coding harness with 1M context, max reasoning, native tools, and cache-friendly extended history.
PresetMiniMax local/endpoint coding harness: long-context reasoning with measured tool behavior.
PresetPrime Agent RLM coding loop hosted by prime-agent-python-client over RPC.
PresetQwen-Coder local coding harness: low temperature, native tools.
PresetRecursive coding harness with the Python kernel in a Docker container. Writes are allowed, networking is off.
PresetRecursive analysis harness on Pydantic Monty: persistent Python, repository reads, and semantic subcalls only.
Integration pendingLong-running Apache-2.0 terminal harness for AI pair programming, built around Git as the unit of change.
Integration pendingQoder's cross-agent project for evaluating and improving coding workflows across Claude Code, Codex, Cursor, and other agents.
Integration pendingCharm's terminal coding harness with multi-provider model switching, LSP context, MCP servers and reusable agent skills.
Integration pendingTensorlake's durable-sandbox playground for launching several coding-agent harnesses.
Integration pendingMIT-licensed terminal harness aimed at large multi-file tasks, with a durable plan the agent works through.
Integration pendingY Combinator's open-source multiplayer agent harness for company work, with interchangeable Pi, OpenCode, Codex, and Claude Code loops.
A cloud background-agent platform that runs Codex or Claude Code in isolated environments and returns pull requests.
Integration pendingApache-2.0 editor-based harness offering a team of specialised agent modes inside the IDE.
A harness and context optimization platform for evaluating coding-agent loops across models and task datasets.
The full catalogue is also served as JSON at /hub.json and documented in the Harness Hub guide.








