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contrarian

v1.1.0

Devil's advocate for coding agents. Stress-tests plans, architecture and decisions with a steel-man, an assumption audit, a pre-mortem and inversion, then gives severity-rated findings and a verdict.

CodexClaude CodeAgent Plugins1 Skill

By aaddrickLicense: Unlicense40 GitHub starsUpdated 2 weeks ago

Directory evidence

Runtimes
Codex, Claude Code, and Agent Plugins
Parsed components
1 skill or MCP entry
Source updated
Oct 7, 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 contrarian 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 contrarian@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/aaddrick/contrarian

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

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

Included Skills1

contrarianskills/contrarian/SKILL.md

Use when stress-testing a proposal, plan, architecture or decision before committing to it, such as pre-mortems, assumption audits, "should we even do this?" questions, or when everyone agrees too easily. Not for code review; it challenges strategy, approach and hidden risks.

Plugin manifests3

.codex-plugin/plugin.json
{
  "name": "contrarian",
  "version": "1.1.0",
  "description": "Devil's advocate for coding agents. Stress-tests plans, architecture and decisions with a steel-man, an assumption audit, a pre-mortem and inversion, then gives severity-rated findings and a verdict.",
  "author": {
    "name": "aaddrick",
    "url": "https://github.com/aaddrick"
  },
  "homepage": "https://github.com/aaddrick/contrarian",
  "repository": "https://github.com/aaddrick/contrarian",
  "license": "Unlicense",
  "keywords": [
    "devils-advocate",
    "pre-mortem",
    "decision-making",
    "architecture-review",
    "risk",
    "codex"
  ],
  "skills": "./skills/",
  "interface": {
    "displayName": "Contrarian",
    "shortDescription": "Devil's advocate that stress-tests a plan before you commit to it.",
    "longDescription": "Stress-test a proposal before reality does. The contrarian steel-mans the plan first, audits its unstated assumptions by likelihood and impact, runs a pre-mortem and inversion, traces second-order effects, and returns severity-rated findings that each carry a failure scenario and a recommendation, then a verdict. Scales its depth to the stakes. Not a code reviewer.",
    "developerName": "aaddrick",
    "category": "Coding",
    "capabilities": [
      "Instructions"
    ],
    "websiteURL": "https://github.com/aaddrick/contrarian",
    "defaultPrompt": [
      "Use contrarian to stress-test this plan before we build it.",
      "Run a pre-mortem on this architecture: assume it failed in six months.",
      "Everyone agrees on this approach. Have contrarian argue the other side."
    ],
    "brandColor": "#B05B33"
  }
}
.claude-plugin/plugin.json
{
  "name": "contrarian",
  "version": "1.1.0",
  "description": "Devil's advocate for coding agents. Stress-tests plans, architecture and decisions with a steel-man, an assumption audit, a pre-mortem and inversion, then gives severity-rated findings and a verdict.",
  "author": {
    "name": "aaddrick",
    "url": "https://github.com/aaddrick"
  },
  "homepage": "https://github.com/aaddrick/contrarian",
  "repository": "https://github.com/aaddrick/contrarian",
  "license": "Unlicense",
  "keywords": [
    "devils-advocate",
    "pre-mortem",
    "decision-making",
    "architecture-review",
    "risk",
    "agent-skill"
  ],
  "agents": [
    "./.claude/agents/contrarian.md"
  ]
}
plugin.json
{
  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
  "name": "contrarian",
  "version": "1.1.0",
  "description": "Devil's advocate for coding agents. Stress-tests plans, architecture and decisions with a steel-man, an assumption audit, a pre-mortem and inversion, then gives severity-rated findings and a verdict.",
  "author": {
    "name": "aaddrick",
    "url": "https://github.com/aaddrick"
  },
  "homepage": "https://github.com/aaddrick/contrarian",
  "repository": "https://github.com/aaddrick/contrarian",
  "license": "Unlicense"
}

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.

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