Add Codex support for qa plugin (dual-host, no MCP)

[ShawnPana]

What

Makes the existing qa plugin installable from Codex, alongside Claude Code — by adding a .codex-plugin/ manifest next to the existing .claude-plugin/ in the same dir. The skills/ directory is shared, so no skill content is duplicated.

qa/
├── .claude-plugin/plugin.json    # existing (Claude)
├── .codex-plugin/plugin.json     # new (Codex)
└── skills/qa/                     # SHARED
.agents/plugins/marketplace.json  # new (Codex catalog)

Claude reads .claude-plugin/, Codex reads .codex-plugin/, each ignores the other.

No MCP

This is the skills-based plugin that drives the browser-harness CLI — nothing to do with the hosted MCP. The only shared-file change is making the SKILL.md install line host-agnostic (claude plugin install … or codex plugin add …).

Validated with codex-cli 0.133.0

codex plugin marketplace add <repo>   # Added marketplace `browser-use`
codex plugin list                     # qa@browser-use  not installed
codex plugin add qa@browser-use       # Installed; shared skills/ + references/ land in cache

(Side note: Codex's marketplace authentication enum is ON_INSTALL | ON_USE only — qa needs neither, so the field is omitted.)

Install (once merged)

codex plugin marketplace add browser-use/plugins
codex plugin add qa@browser-use      # then /qa <url>

Follow-up

• browser-harness is remote-sourced from its own repo, so its .codex-plugin/ manifest belongs there. qa needs the browser-harness CLI (host-independent uv/pip install) regardless.
• If more hosts land (Grok, …), worth moving to a single-source generator instead of hand-written per-host manifests.

🤖 Generated with Claude Code

---

Summary by cubic

Enable installing the qa plugin from Codex alongside Claude Code by adding a .codex-plugin/ manifest and a Codex marketplace entry. Skills are shared with the existing .claude-plugin/, so nothing is duplicated.

• New Features

  • Added qa/.codex-plugin/plugin.json and .agents/plugins/marketplace.json (registers qa under browser-use).
  • Hosts read their own manifests; shared skills/ directory; no MCP or auth required.
  • Updated qa/skills/qa/SKILL.md with host-agnostic install guidance.

• Migration

  • Codex: run codex plugin marketplace add browser-use/plugins, then codex plugin add qa@browser-use.
  • Ensure the browser-harness CLI is installed (via your agent’s plugin or uv/pip per the skill docs).

^{Written for commit a09436f. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 3 files

_{Re-trigger cubic}