agent-harness
A TypeScript runtime framework for configuring and running AI agents.
Install & Use
Copy this prompt and send it to your AI assistant (Claude / Cursor / TRAE / Codex / WorkBuddy etc.) to auto-install:
Help me install this AI Skill: agent-harness. It is used for: A TypeScript runtime framework for configuring and running AI agents. Full Skill content: https://321skill.com/skills/agent-harness/raw/index.md Read that page and install it.
The prompt includes a link to the full Skill content. You can also view the full content.
Agent Harness is a runtime framework for AI agents. It is not intelligent itself but provides reliable infrastructure for agents. It addresses the foundational infrastructure challenges developers face when building and deploying AI agents, such as model integration, tool execution, security isolation, and session management.
To use it, simply install via the command line, run agent config init to initialize the configuration, and then start an interactive chat session with the agent command, or execute a single task using agent -p "your prompt". It supports dynamically switching between different LLM providers and models at runtime.
This framework is ideal for agent developers, full-stack engineers, and any technical practitioner who wants to quickly build, test, and deploy AI applications without constructing complex underlying pipelines from scratch.
When getting started, it's recommended to first review the default configuration via agent config show and set up providers as needed. For scenarios involving sensitive operations or untrusted code, it is strongly advised to use the --sandbox parameter to run in a sandbox for security.
Key Features
Unlike many agents that offer predefined behaviors, Agent Harness explicitly positions itself as "infrastructure" rather than a "driver." It focuses on providing a stable, scalable runtime environment, leaving the definition of behavior (via AGENTS.md, skills, and commands) entirely to the user. This achieves a complete decoupling of the underlying framework from the upper-layer intelligence.
Limitations
It does not provide predefined agent behaviors or task solutions out-of-the-box. Users must configure and define these themselves, making it unsuitable for those seeking a ready-to-use agent with immediate functionality.
FAQ
What's the difference between Agent Harness and calling the OpenAI API directly?
It provides a complete runtime environment including tool execution, security sandboxing, session management, and multi-model switching, rather than just an API call.
Is programming knowledge required to use it?
Basic interactive chat does not require programming. However, customizing agent behavior, tools, or skills requires some TypeScript/JavaScript development capability.
Installation guide for AI assistants
If your AI coding assistant (Claude Code, Cursor, TRAE etc.) can see this page, send it this message to auto-install:
Visit https://321skill.com/skills/agent-harness/raw/index.md to read the original Skill definition (Markdown format) for agent-harness, and install it according to the instructions.
Raw Markdown URL for AI: /skills/agent-harness/raw/index.md