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bosun

v0.6.0

Spec-anchored workflow for autonomous coding runs on GPT-6 Astra in Codex: brief, run, verify, checkpoint. astra mode has Astra implement each slice; astra-crew routes implementation to gpt-5.6-sol or gpt-5.6-luna subagents by task class. Same spec contract as the Claude Code plugin in this repo.

Codex3 Skills

By Michael KissingerLicense: MIT1 GitHub starsUpdated 2 weeks ago

Directory evidence

Runtimes
Codex
Parsed components
3 skill or MCP entries
Source updated
Sep 9, 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 bosun for Codex

Installs for the current user
codex plugin marketplace add mckissinger/bosun
codex plugin marketplace upgrade bosun
codex plugin add bosun@bosun

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

Compatibility: the page URL and API slug “bosun-2” remain stable.

  • Codex: bosun-2@agent-plugin-marketplace → bosun@bosun

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/mckissinger/bosun

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

Plugin files

codex/
├── .codex-plugin/plugin.json
├── skills/bosun-brief/SKILL.md
├── skills/bosun-mode/SKILL.md
└── skills/bosun-verify/SKILL.md

Included Skills3

bosun-briefskills/bosun-brief/SKILL.md

Start substantial coding work on GPT-6 Astra in Codex. On a project with no spec, it creates SPEC.md from the request and whatever structures the user supplies, then stops for review. On a project with a spec, it briefs the next slice (outcome, checkable done-conditions, out-of-scope, assumptions, checks, branch), runs it to completion (itself in astra mode, through a worker subagent in astra-crew), verifies, and updates the spec. Use at the start of any task beyond a few tool calls (features, multi-file changes, refactors, migrations, debugging), or when the user says "brief this", "start the project", "next slice", or "run this end to end".

bosun-modeskills/bosun-mode/SKILL.md

Set or report the harness's provider mode for this project from Codex. `astra` has GPT-6 Astra implement each slice itself; `astra-crew` has Astra lead while gpt-5.6-sol or gpt-5.6-luna subagents implement, routed by task class. Setting either also installs the harness's agent files. The `fable` and `fable-crew` modes belong to the Claude Code plugin. Use when the user says "switch to astra-crew", "use sol/luna for implementation", "what mode are we in", or "move this to Claude".

bosun-verifyskills/bosun-verify/SKILL.md

Independently verify a finished slice in a fresh, read-only context before reporting it done. Spawns the bosun_verifier agent (GPT-6 Astra, high, read-only), which checks the diff against the spec's done-conditions, runs the project's checks, hunts for bugs, and reports; then records verified status in the spec. Use after completing a slice, before opening a PR, or when the user asks "is this actually done", "verify", or "double-check".

Plugin manifests1

codex/.codex-plugin/plugin.json
{
  "name": "bosun",
  "version": "0.6.0",
  "description": "Spec-anchored workflow for autonomous coding runs on GPT-6 Astra in Codex: brief, run, verify, checkpoint. astra mode has Astra implement each slice; astra-crew routes implementation to gpt-5.6-sol or gpt-5.6-luna subagents by task class. Same spec contract as the Claude Code plugin in this repo.",
  "author": {
    "name": "Michael Kissinger"
  },
  "repository": "https://github.com/mckissinger/bosun",
  "license": "MIT",
  "keywords": [
    "harness",
    "spec",
    "verification",
    "subagents"
  ],
  "skills": "./skills/",
  "hooks": "./hooks/hooks.json",
  "interface": {
    "displayName": "Bosun",
    "shortDescription": "Brief, run, verify, checkpoint on GPT-6 Astra",
    "longDescription": "One durable spec per project, effort chosen at session start, fresh-context verification by a read-only subagent, and a checkpoint for stopping mid-slice. In astra-crew mode Astra leads and Sol or Luna implement by task class.",
    "developerName": "Michael Kissinger",
    "category": "Developer Tools",
    "capabilities": [
      "Read",
      "Write"
    ],
    "defaultPrompt": [
      "$bosun-brief the next slice",
      "$bosun-verify this slice",
      "$bosun-mode astra-crew"
    ]
  }
}

For maintainers

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[bosun on Agent Plugins Marketplace](https://pluginsmp.com/plugins/bosun-2)