I created managed Skills Marketplace for MCPBundler, but it also suitable for Claude Code/ Codex and other Ai tools, you can check it out on GitHub or browse here.
Translate EPUB (.epub) ebooks to another language by unpacking the EPUB container, extracting XHTML block-level fragments into JSONL translation units, translating them via the OpenAI Responses API (e.g. gpt-5.1 / gpt-5-mini) while preserving markup, updating language metadata, and repackaging a valid EPUB (mimetype-first and uncompressed). Use when Codex needs to translate and rebuild EPUB files.
Manage local Obsidian vaults and markdown notes. Use when Codex needs to connect to local Obsidian vaults, register vault paths, or create/edit/refactor/search notes, frontmatter, links, tags, and attachments within a vault.
Define a standard per-skill local data layout at <project_root>/.skills-data/<skill-name> and required SKILL.md guidance for env/config/deps/tools. Use when starting a new skill and you must specify where to store data, env files, local binaries, and dependencies.
Manage tasks, projects, areas, headings, and tags in the Things 3 macOS app via a local CLI (list Inbox/Today/Upcoming/Anytime/Someday/Logbook, search, create/update/complete/cancel items, open items in Things). Use when Codex needs to manage Things 3 on macOS.
Read X/Twitter bookmarks using the bird CLI, verify the active account via `bird whoami`, and return bookmarks as JSON. Use when the user asks to list, search, summarize, or export X bookmarks, or when you must validate the active X account before fetching bookmarks.