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hephaestus

v0.1.0

Efficient AI execution through focused context, bounded delegation, and evidence-based verification.

CodexAgent Plugins1 Skill

By Eidos AGI0 GitHub starsUpdated last month

Directory evidence

Runtimes
Codex and Agent Plugins
Parsed components
1 skill or MCP entry
Source updated
Sep 13, 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 hephaestus for Codex

Installs for the current user
codex plugin marketplace add eidos-agi/hephaestus
codex plugin marketplace upgrade eidos-hephaestus
codex plugin add hephaestus@eidos-hephaestus

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

Compatibility: the page URL and API slug “hephaestus” remain stable.

  • Codex: hephaestus@agent-plugin-marketplace → hephaestus@eidos-hephaestus

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/eidos-agi/hephaestus

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

hephaestus/
├── .codex-plugin/plugin.json
├── plugin.json
└── skills/hephaestus/SKILL.md

Included Skills1

hephaestusskills/hephaestus/SKILL.md

Complete substantial coding, research, and analysis tasks with focused context, bounded delegation, economical available models, and verified results. Use when the user invokes Hephaestus or requests efficient execution, independent parallel work, reduced context overhead, or resumption of a substantial task. Do not activate for unrelated simple questions.

Plugin manifests2

.codex-plugin/plugin.json
{
  "name": "hephaestus",
  "version": "0.1.0",
  "description": "Efficient AI execution through focused context, bounded delegation, and evidence-based verification.",
  "author": {
    "name": "Eidos AGI"
  },
  "repository": "https://github.com/eidos-agi/hephaestus",
  "homepage": "https://github.com/eidos-agi/hephaestus",
  "keywords": [
    "skills",
    "delegation",
    "context-efficiency",
    "verification"
  ],
  "skills": "./skills/",
  "interface": {
    "displayName": "Hephaestus",
    "shortDescription": "Focused context. Useful delegation. Verified results.",
    "longDescription": "Teach AI to complete substantial work efficiently with focused context, bounded delegation, economical available models, deterministic tools, and evidence-based review. Skills only: no server, API key, or local setup required to use the method.",
    "developerName": "Eidos AGI",
    "category": "Productivity",
    "websiteURL": "https://github.com/eidos-agi/hephaestus",
    "defaultPrompt": [
      "Use Hephaestus to complete this task efficiently.",
      "Use Hephaestus and delegate independent work to available subagents.",
      "Use Hephaestus to resume this task from its saved evidence."
    ]
  }
}
plugin.json
{
  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
  "name": "hephaestus",
  "version": "0.1.0",
  "description": "Efficient AI execution through focused context, bounded delegation, and evidence-based verification.",
  "author": {
    "name": "Eidos AGI"
  },
  "repository": "https://github.com/eidos-agi/hephaestus",
  "homepage": "https://github.com/eidos-agi/hephaestus",
  "keywords": [
    "skills",
    "delegation",
    "context-efficiency",
    "verification"
  ],
  "extensions": {
    "com.openai": {
      "interface": {
        "displayName": "Hephaestus",
        "shortDescription": "Focused context. Useful delegation. Verified results.",
        "longDescription": "Teach AI to complete substantial work efficiently with focused context, bounded delegation, economical available models, deterministic tools, and evidence-based review. Skills only: no server, API key, or local setup required to use the method.",
        "developerName": "Eidos AGI",
        "category": "Productivity",
        "websiteURL": "https://github.com/eidos-agi/hephaestus",
        "defaultPrompt": [
          "Use Hephaestus to complete this task efficiently.",
          "Use Hephaestus and delegate independent work to available subagents.",
          "Use Hephaestus to resume this task from its saved evidence."
        ]
      }
    }
  }
}

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.

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