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AI coding agents · CLI · apps · harnesses

Choose the agent surface. Understand the system around it.

Practical, source-driven guides to coding agents such as Codex, Claude Code, Gemini CLI, Hermes and more. Each guide separates the model, the agent, the harness, the gateway and the orchestrator so you can reason about context, tools, permissions and verification.

9 guides
CLI + app surfaces
Security first permissions and isolation
Start here: the vocabulary is not uniform A model generates responses. A coding agent applies a model to a software task. A harness is the surrounding system that supplies context, tools, execution, permissions and feedback. A gateway routes model traffic, while an orchestrator coordinates workers. Vendors use these words differently, so inspect the actual controls rather than trusting a label.
01 · Model

Reasoning and generation

Produces text, decisions or tool calls. It does not automatically have access to your repository.

02 · Harness

Context and action loop

Supplies files, tools, permissions, execution, session state and feedback around the model.

03 · Surface

CLI, IDE, desktop or API

Gives a person or automation a way to start, observe, approve and verify work.

Find a coding agent or concept

Search by product, interface or workflow. Every product page includes current official documentation links and a dated review note.

Concept guide

AI agent harness

A harness is the system around a model that gives it context, tools, permissions, an execution loop and verification.

FoundationsBy Concept guide — no single vendorReviewed 2026-09-26
Open guide →Terminal coding agent

OpenAI Codex CLI

A terminal coding agent from OpenAI that can work against a local project and is also available through editor and app surfaces.

CLI agentsBy OpenAIReviewed 2026-09-26
Open guide →Terminal and IDE coding agent

Claude Code

An Anthropic coding agent available in the terminal and other development surfaces that can read code, edit files, run commands and use integrations.

CLI agentsBy AnthropicReviewed 2026-09-26
Open guide →Open-source terminal agent

Gemini CLI

Google's open-source terminal AI agent for working with Gemini models, repository context, tools and MCP integrations.

CLI agentsBy GoogleReviewed 2026-09-26
Open guide →Agent and workflow runtime

Hermes Agent

A provider-agnostic agent runtime with CLI, desktop, tools, skills, memory and messaging or gateway surfaces that can coordinate longer-running workflows.

OrchestrationBy Nous ResearchReviewed 2026-09-26
Open guide →Open-source terminal coding agent

OpenCode

A terminal-native coding agent with interactive and scripted surfaces, provider configuration and an open-source workflow.

CLI agentsBy OpenCode projectReviewed 2026-09-26
Open guide →Terminal pair-programming tool

Aider

A terminal-first AI pair-programming tool that works with Git repositories and a range of hosted or local models.

CLI agentsBy Aider projectReviewed 2026-09-26
Open guide →IDE, desktop and CLI coding agent

Cline

An open-source coding agent available across IDE, terminal and desktop surfaces with human-in-the-loop tool execution.

IDE and CLI agentsBy Cline projectReviewed 2026-09-26
Open guide →Terminal coding agent

GitHub Copilot CLI

GitHub's command-line Copilot surface for conversational assistance, coding tasks, custom agents and delegated workflows.

CLI agentsBy GitHubReviewed 2026-09-26
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Keep model routers, local runtimes, hosted gateways and MCP in the separate AI tools directory.

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