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jeff

v6.7.0

Jeff is a model-native quality control plane and cooperative workflow protocol, not a security sandbox.

CodexClaude Code4 Skills

By Johan ThorénLicense: Apache-2.05 GitHub starsUpdated last week

Directory evidence

Runtimes
Codex and Claude Code
Parsed components
4 skill or MCP entries
Source updated
Sep 12, 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 jeff for Codex and Claude Code

Installs for the current user
codex plugin marketplace add johanthoren/jeff
codex plugin marketplace upgrade jeff
codex plugin add jeff@jeff

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

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

  • Codex: jeff@agent-plugin-marketplace → jeff@jeff

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/johanthoren/jeff

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

jeff/
├── .codex-plugin/plugin.json
├── .claude-plugin/plugin.json
├── skills/code-standards/SKILL.md
├── skills/cook/SKILL.md
├── skills/security-auditor/SKILL.md
└── skills/testing/SKILL.md

Included Skills4

code-standardsskills/code-standards/SKILL.md

Language-agnostic code standards for writing clean, maintainable code. Covers modular design, functional patterns, error handling, security, and testing. Make sure to use this skill whenever writing, refactoring, or reviewing any code, even for quick fixes, prototypes, or single-file changes. This is the baseline for all code quality. Language-specific skills, if present, may override these defaults.

cookskills/cook/SKILL.md

Handle engineering work in an active jeff project and drive its tracked task pipeline. Use when the Chef addresses Jeff, mentions jeff/cook, asks to set up, initialize, turn on, deinit, validate, or check status/tasks; runs `cook`, `cook <taskId>`, or `cook on <ref>`; wants to start or resume a task; asks to implement/build a plan (not merely read/review it); or describes real engineering work in an active jeff project. Ordinary intent starts Explore and assess→forks before durable writes (ad-hoc ship / record pending / record+start). Explicit task controls route to the pipeline.

security-auditorskills/security-auditor/SKILL.md

Adversarial security auditing workflow for source changes. Make sure to use this skill whenever reviewing code before merge, hunting for vulnerabilities, auditing dependencies, or assessing security exposure of new features, even if the user doesn't explicitly ask for a security review. Includes OWASP-focused scans, dependency-audit attempts, coverage accounting, and strict pass/block recommendations.

testingskills/testing/SKILL.md

Language-agnostic testing standards for writing effective tests. Covers test structure, what to test, mocking, and coverage goals. Make sure to use this skill whenever writing tests, doing TDD, reviewing test coverage, or when code changes should have tests added; testing standards apply to all code, not just dedicated test tasks. Language-specific skills, if present, may override these defaults.

Plugin manifests2

.codex-plugin/plugin.json
{
  "name": "jeff",
  "version": "6.7.0",
  "description": "Jeff is a model-native quality control plane and cooperative workflow protocol, not a security sandbox.",
  "author": {
    "name": "Johan Thorén"
  },
  "homepage": "https://github.com/johanthoren/jeff",
  "repository": "https://github.com/johanthoren/jeff",
  "license": "Apache-2.0",
  "keywords": [
    "workflow",
    "agents",
    "code-review",
    "orchestration"
  ],
  "skills": "./skills/",
  "interface": {
    "displayName": "Jeff",
    "shortDescription": "A model-native quality control plane",
    "longDescription": "Your sous chef, Jeff, is a model-native quality control plane and cooperative workflow protocol for trusted operators and friendly agents, not a security sandbox. Fresh specialist contexts, enforced separation, durable evidence, and deterministic gates hold the pass.",
    "developerName": "Johan Thorén",
    "category": "Developer Tools",
    "capabilities": [
      "Task orchestration",
      "Code review"
    ],
    "defaultPrompt": [
      "Jeff, set up here.",
      "Jeff, work this task through the full pipeline."
    ]
  }
}
.claude-plugin/plugin.json
{
  "name": "jeff",
  "version": "6.7.0",
  "description": "Meet your new sous chef, Jeff: a model-native quality control plane and cooperative workflow protocol for trusted operators and friendly agents, not a security sandbox.",
  "author": {
    "name": "Johan Thorén"
  },
  "license": "Apache-2.0",
  "repository": "https://github.com/johanthoren/jeff",
  "homepage": "https://github.com/johanthoren/jeff",
  "keywords": [
    "workflow",
    "agents",
    "tasks",
    "tdd",
    "code-review",
    "orchestration"
  ]
}

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.

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