Aeon

Aeon is an open-source agent harness and orchestration framework created by aeonfun. It provides standardized agent skills, tool packs, and operator console integrations designed to enhance and coordinate workflows across terminal and IDE-based coding agents. Day-to-day operation centers around plugin manifests and declarative configurations, including `aeon.yml`, `AGENTS.md`, and `llms.txt`. Aeon connects directly into agent environments such as Claude Code, OpenAI Codex, and Cline via Model Context Protocol (MCP) servers and dedicated plugin marketplace registries. It allows developers to invoke structured skill packs and operator interfaces straight from their existing CLI agent sessions. What sets Aeon apart is its multi-harness compatibility layer. Rather than operating as an isolated CLI chatbot, Aeon standardizes operator skill distribution across disparate agent ecosystems like Claude Code plugins, Codex plugins, and Cline MCP integrations from a single unified repository structure. Aeon is open source on GitHub and designed to be integrated into both local developer environments and automated agent pipelines without proprietary licensing lock-in.

Tags: agent harness, ai agent, cli, coding agent, developer tools, OpenSource

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Key features

  • Multi-agent plugin distribution — Provides standard plugin packages for Claude Code and Codex interfaces via dedicated marketplace manifests. - MCP server integration — Exposes operator capabilities and toolsets over the Model Context Protocol for compatibility with tools like Cline. - Declarative harness configuration — Standardizes agent orientation and instructions using structured repository files such as aeon.yml, AGENTS.md, and llms.txt. - Modular skills catalog — Ships modular skill packs and operator console tooling that can be attached to terminal coding sessions. - Self-orienting agent documentation — Includes standardized llms.txt doc maps pointing to core repository entry points for autonomous agent discovery.

Use cases

Standardizing Skill Packs Across Coding Agents Developers running both Claude Code in the CLI and Cline in the IDE can use Aeon to share consistent operator tools and execution skills across environments via unified plugin and MCP configurations.

Repository Onboarding for Autonomous Agents Teams configure aeon.yml and llms.txt in project roots so autonomous coding agents can automatically discover entry points, architectural boundaries, and operational constraints without manual prompting.

CLI Operator Console Orchestration Engineers invoke Aeon's operator console plugins directly within terminal agent workflows to execute predefined maintenance, setup, and orchestration scripts.

Who it is for

Aeon is intended for developers and teams using modern terminal AI agents like Claude Code, Codex, or MCP-compliant environments like Cline who need unified skill sets and consistent harness configurations. It is less relevant for developers who only use standalone web chat interfaces or static single-agent IDE extensions without MCP or custom plugin support.

Install guide

Installation Install the Aeon plugin directly inside your supported CLI agent environment (such as Claude Code or OpenAI Codex): bash # For Codex CLI codex plugin marketplace add aeonfun/aeon codex plugin add aeon@aeon Alternatively, clone the repository for direct harness configuration: bash git clone https://github.com/aeonfun/aeon.git cd aeon

First Run Ensure your agent environment recognizes the configuration files (aeon.yml and AGENTS.md) and verify plugin installation: bash # Verify configuration file presence ls -la aeon.yml AGENTS.md llms.txt

Example Session Invoke an Aeon skill or initialize the operator console from within your agent CLI session: bash # Inside your agent CLI session (e.g., Claude Code or Codex) /aeon setup

Part of CLI Coding Agents

Categories: AI Coding Agents, Code Assistants, Developer Tools

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