A curated plugin repository that is compatible with both Claude Code and OpenAI Codex.
<plugin-name>/: shared plugin content<plugin-name>/.claude-plugin/plugin.json: Claude plugin manifest<plugin-name>/.codex-plugin/plugin.json: Codex plugin manifest.claude-plugin/marketplace.json: Claude marketplace catalog.agents/plugins/marketplace.json: Codex marketplace catalog
This repository now includes a repo-scoped Codex marketplace at:
.agents/plugins/marketplace.json
Each Codex plugin follows the structure described in the OpenAI Codex plugin documentation:
.codex-plugin/plugin.jsonfor the plugin manifest- optional
skills/,.mcp.json,.app.json, andassets/at the plugin root
Official reference:
- Open this repository in Codex.
- Restart Codex if the marketplace was added while Codex was already running.
- Open the plugin directory.
- Select the Studykit Plugins marketplace.
- Install or enable the plugins you want.
Codex reads the repo marketplace from .agents/plugins/marketplace.json.
Claude compatibility is preserved through the existing Claude marketplace files:
.claude-plugin/marketplace.json<plugin-name>/.claude-plugin/plugin.json
For compatibility and versioning rules, see AGENTS.md.
doc-util— reading and searching various document formats including CHM fileskorea-gov-data— extract and organize Open API specifications from KOSIS (Korean Statistical Information Service)dom-analyzer— HTML/XML DOM structure analysis toolkit with hierarchy visualizationspectrack— provider-backed workflow over GitHub Issues, Jira, GitHub repository wiki directory, and Confluence with issue and knowledge authoring contractsdiagram— PlantUML, D2, and Structurizr DSL diagram creation, syntax reference, validation, and renderingguard— user-configured answer, turn, and plan reviews, plus rule-based checkpoints for changed filesdelegate— delegation through a named sizing agent, with verified worker results and persistent verdictshandover— create a self-contained session handover and load a recorded handover after a clearlens— Herdr file tree with popup and overlay views, saved navigation state, filename search, Markdown and source previews, diagram rendering (PlantUML, Mermaid, D2, Graphviz and more), and Git diffsshellbox— resumable Herdr shell popup for each paneagenda— a pane of the session's current topic and open items, so a long conversation keeps its thread
handover and agenda are Claude Code only. lens and shellbox install through Herdr and work alongside any agent. The remaining plugins run in both Claude Code and Codex.