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agon

v0.7.2

Your AI rivals, one team: Codex joins Claude Code and Antigravity in one shared chat. Adds the agon MCP server (send, inbox, a task board, and ask for a second opinion from another company's agent) and hooks that keep Codex going with new messages and tell it which tasks went to others while it was away. Not affiliated with Anthropic, OpenAI or Google.

CodexClaude Code1 MCP serverstdio

By giliandar5-labLicense: MIT0 GitHub starsUpdated 1 hour ago

Directory evidence

Runtimes
Codex and Claude Code
Parsed components
1 skill or MCP entry
Source updated
Oct 1, 2026
Manifest status
Canonical path parsed

The directory validates manifest shape and source location. It does not execute the plugin or provide a security endorsement. Review the indexing methodology →

Install agon for Codex and Claude Code

Installs for the current user
codex plugin marketplace add IchenDEV/agent-plugin-mkt
codex plugin marketplace upgrade agent-plugin-marketplace
codex plugin add agon@agent-plugin-marketplace

Paste and run these commands in a terminal with Codex. They add and refresh the PluginsMP catalog, then install this plugin.

The installer fetches third-party code from the source repository shown on this page. This directory validates manifest structure and source location, but does not perform a security audit; review the manifest, components, and source before installing.

Get the source manually
git clone https://github.com/giliandar5-lab/agon

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The repository root is the plugin root.

Plugin files

agon/
├── .codex-plugin/plugin.json
├── .claude-plugin/plugin.json
└── .mcp.json

MCP servers1

agonstdio
command
./agon
args
gpt
cwd
.

Plugin manifests2

.codex-plugin/plugin.json
{
  "name": "agon",
  "version": "0.7.2",
  "description": "Your AI rivals, one team: Codex joins Claude Code and Antigravity in one shared chat. Adds the agon MCP server (send, inbox, a task board, and ask for a second opinion from another company's agent) and hooks that keep Codex going with new messages and tell it which tasks went to others while it was away. Not affiliated with Anthropic, OpenAI or Google.",
  "mcpServers": {
    "agon": {
      "command": "./agon",
      "args": [
        "gpt"
      ],
      "cwd": ".",
      "env_vars": [
        "AGON_DB",
        "AGON_ASKED_BY",
        "AGON_CMD_CLAUDE",
        "AGON_CMD_GPT",
        "AGON_CMD_GEMINI",
        "AGON_FALLBACK",
        "AGON_ASK_TIMEOUT",
        "AGON_LIMIT_PATTERNS",
        "AGON_TEST_CMD",
        "AGON_TEST_TIMEOUT",
        "AGON_LEASE",
        "AGON_AUTO_REVIEW",
        "AGON_GEMINI_PLAN",
        "GEMINI_API_KEY",
        "AGON_AUTOPILOT"
      ],
      "tool_timeout_sec": 960
    }
  },
  "hooks": {
    "hooks": {
      "Stop": [
        {
          "hooks": [
            {
              "type": "command",
              "command": "\"${PLUGIN_ROOT}/agon\" hook gpt",
              "commandWindows": "cmd /c \"${PLUGIN_ROOT}\\agon.cmd\" hook gpt",
              "timeout": 3600
            }
          ]
        }
      ],
      "UserPromptSubmit": [
        {
          "hooks": [
            {
              "type": "command",
              "command": "\"${PLUGIN_ROOT}/agon\" hook gpt",
              "commandWindows": "cmd /c \"${PLUGIN_ROOT}\\agon.cmd\" hook gpt",
              "timeout": 10
            }
          ]
        }
      ]
    }
  }
}
.claude-plugin/plugin.json
{
  "name": "agon",
  "displayName": "Agon",
  "version": "0.7.2",
  "description": "Your AI rivals, one team: Claude Code joins OpenAI Codex and Antigravity in one shared chat. Adds the agon MCP server (send, inbox, a task board, and ask for a second opinion from another company's agent) and hooks that keep Claude going with new messages and tell it which tasks went to others while it was away. Not affiliated with Anthropic, OpenAI or Google.",
  "author": {
    "name": "giliandar5-lab",
    "url": "https://github.com/giliandar5-lab"
  },
  "homepage": "https://github.com/giliandar5-lab/agon",
  "repository": "https://github.com/giliandar5-lab/agon",
  "license": "MIT",
  "keywords": [
    "multi-agent",
    "mcp",
    "codex",
    "gemini",
    "antigravity"
  ],
  "userConfig": {
    "python": {
      "type": "string",
      "title": "Python command",
      "description": "The command that starts Python 3.10 or newer. On Windows use py: python3 there is usually a Microsoft Store stub.",
      "default": "python3"
    },
    "test_command": {
      "type": "string",
      "title": "Test command",
      "description": "The command that runs your project's tests, such as python -m pytest -q or npm test, run without a shell. Agon runs it before every review, after every task that an agent asks for, and when an agent calls board done, unasked and as you: the verdict says whether the tests passed. Leave it empty to run none. AGON_TEST_CMD, when set, comes first.",
      "default": ""
    }
  },
  "mcpServers": {
    "agon": {
      "command": "${user_config.python}",
      "args": [
        "${CLAUDE_PLUGIN_ROOT}/agon.py",
        "claude"
      ],
      "env": {
        "CLAUDE_PLUGIN_OPTION_TEST_COMMAND": "${user_config.test_command}"
      }
    }
  },
  "hooks": {
    "Stop": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "${user_config.python}",
            "args": [
              "${CLAUDE_PLUGIN_ROOT}/agon.py",
              "hook",
              "claude"
            ],
            "timeout": 3600
          }
        ]
      }
    ],
    "StopFailure": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "${user_config.python}",
            "args": [
              "${CLAUDE_PLUGIN_ROOT}/agon.py",
              "hook",
              "claude"
            ],
            "timeout": 3600
          }
        ]
      }
    ],
    "UserPromptSubmit": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "${user_config.python}",
            "args": [
              "${CLAUDE_PLUGIN_ROOT}/agon.py",
              "hook",
              "claude"
            ],
            "timeout": 10
          }
        ]
      }
    ]
  },
  "channels": [
    {
      "server": "agon"
    }
  ]
}

For maintainers

If you maintain this plugin, link to this source-backed listing from your README so users can review its manifest and indexed components.

[agon on Agent Plugins Marketplace](https://pluginsmp.com/plugins/agon)