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dev-tools-plugin

v1.6.0+codex.20260912225547

Developer tooling for read-only thinking and Q&A, git workflows, code hygiene, dependency management, and project documentation. Every skill is user-invoked only.

Codex9 Skills1 MCP serverStreamable HTTP

By Lukas KellersteinLicense: UNLICENSED1 GitHub starsUpdated last week

Directory evidence

Runtimes
Codex
Parsed components
10 skill or MCP entries
Source updated
Sep 14, 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 dev-tools-plugin for Codex

Installs for the current user
codex plugin marketplace add lukaskellerstein/codex-my-marketplace
codex plugin marketplace upgrade codex-my-marketplace
codex plugin add dev-tools-plugin@codex-my-marketplace

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

Compatibility: the page URL and API slug “dev-tools-plugin” remain stable.

  • Codex: dev-tools-plugin@agent-plugin-marketplace → dev-tools-plugin@codex-my-marketplace

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/lukaskellerstein/codex-my-marketplace

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

Plugin files

plugins/dev-tools-plugin/
├── .codex-plugin/plugin.json
├── skills/brainstorm/SKILL.md
├── skills/dead-code/SKILL.md
├── skills/git-pr/SKILL.md
├── skills/question/SKILL.md
├── skills/sync-spec-kit/SKILL.md
├── skills/update-dependencies/SKILL.md
├── skills/update-docs/SKILL.md
├── skills/update-feature-docs/SKILL.md
├── skills/update-readme/SKILL.md
└── .mcp.json

Included Skills9

brainstormskills/brainstorm/SKILL.md

Think a decision through — explore an idea, compare approaches, sketch a design, plan a change, research feasibility or prior art. A read-only thinking partner that ends in a recommendation, not an edit.

dead-codeskills/dead-code/SKILL.md

Identify unused code (functions, imports, exports, variables, types, classes) and propose cleanup. Use this skill when the user says "find dead code", "unused code", "clean up unused", "code hygiene", "find unused imports", "what can I delete", or any variation of wanting to identify and remove code that is no longer referenced.

git-prskills/git-pr/SKILL.md

For every git repo in the current folder, create and merge a PR for feature-branch work, then return to the default branch and pull. With no arguments this runs fully autonomously across ALL sub-repos — commit → push → PR → squash-merge → checkout main → pull. Use whenever the user asks to commit, ship, push, open/merge a PR, "update all repos", "get back to main", or any variant of saving work to a PR and bringing branches up to date — even if they mention only one part of the flow.

questionskills/question/SKILL.md

Answer a question about how things are right now — this codebase, its history, its behavior, a library, an error. Investigates and answers with evidence. Changes nothing, ever.

sync-spec-kitskills/sync-spec-kit/SKILL.md

Synchronize the spec folder with the current state of implementation on a feature branch. Use this skill when the user says "sync spec", "update spec", "spec is outdated", "reflect changes in spec", "update the plan", "sync specification", "keep spec up to date", "spec drift", or any variation of wanting to reconcile implementation changes back into the spec-kit specification files (spec.md, plan.md, tasks.md, research.md, etc.).

update-dependenciesskills/update-dependencies/SKILL.md

Update project dependencies to their latest versions, verify nothing breaks, and report what changed. Use this skill when the user says "update dependencies", "upgrade packages", "latest versions", "update deps", "outdated packages", "bump dependencies", or any variation of wanting to bring project dependencies up to date.

update-docsskills/update-docs/SKILL.md

Create or refresh project documentation for architecture, infrastructure, security, technology, and features outside docs/features. Use update-feature-docs for branch-specific feature documentation.

update-feature-docsskills/update-feature-docs/SKILL.md

Generate or update docs/features documentation for the current feature branch by analyzing its commits and diff against the base branch.

update-readmeskills/update-readme/SKILL.md

Create or update a professional root-level README.md for a repository. Use when creating a README, updating a README, generating a README, improving a README, making a professional README, crafting an open-source README, or adding badges, diagrams, and quick-start sections to a project's main README file.

MCP servers1

mermaidStreamable HTTP
url
https://mcp.mermaid.ai/mcp

Plugin manifests1

plugins/dev-tools-plugin/.codex-plugin/plugin.json
{
  "name": "dev-tools-plugin",
  "version": "1.6.0+codex.20260912225547",
  "description": "Developer tooling for read-only thinking and Q&A, git workflows, code hygiene, dependency management, and project documentation. Every skill is user-invoked only.",
  "author": {
    "name": "Lukas Kellerstein",
    "url": "https://github.com/lukaskellerstein"
  },
  "homepage": "https://github.com/lukaskellerstein/codex-my-marketplace",
  "repository": "https://github.com/lukaskellerstein/codex-my-marketplace",
  "license": "UNLICENSED",
  "keywords": [
    "codex",
    "brainstorm",
    "question",
    "read-only",
    "developer-tools",
    "git",
    "dependencies",
    "docs",
    "mermaid"
  ],
  "skills": "./skills/",
  "mcpServers": "./.mcp.json",
  "interface": {
    "displayName": "Dev Tools Plugin",
    "shortDescription": "Reusable developer workflow skills.",
    "longDescription": "Adds explicit-only Codex skills for brainstorming, evidence-backed Q&A, pull requests, dead-code analysis, dependency updates, spec synchronization, and documentation updates with Mermaid validation.",
    "developerName": "Lukas Kellerstein",
    "category": "Productivity",
    "capabilities": [
      "Read",
      "Write",
      "Interactive"
    ],
    "defaultPrompt": [
      "Use $brainstorm to compare approaches to this change.",
      "Use $question to explain how this code works today.",
      "Use $git-pr to ship and merge the current work."
    ],
    "brandColor": "#2563EB"
  }
}

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.

[dev-tools-plugin on Agent Plugins Marketplace](https://pluginsmp.com/plugins/dev-tools-plugin)