Comprehensive spreadsheet creation, editing, and analysis with support for formulas, formatting, data analysis, and visualization. When Codex needs to work with spreadsheets (.xlsx, .xlsm, .csv, .tsv, etc) for: (1) Creating new spreadsheets with formulas and formatting, (2) Reading or analyzing data, (3) Modify…
Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).
Guide for creating effective skills, adding skill references, skill scripts or optimizing existing skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Codex's capabilities with specialized knowledge, workflows, frameworks, libraries or plugins usage, or…
Regenerate the AppointMe frontend API client (orval/TanStack Query hooks + TypeScript schemas) after the backend OpenAPI surface changes. Use this whenever backend endpoints, request/response DTOs, or other contract-affecting types are added, removed, or modified — e.g. after editing files under src/AppointMe.Api…
Manages shadcn components and projects — adding, searching, fixing, debugging, styling, and composing UI. Provides project context, component docs, and usage examples. Applies when working with shadcn/ui, component registries, presets, --preset codes, or any project with a components.json file. Also triggers for…
Use when a change is nearing completion or affects behavior, configuration, operations, documentation, dependencies, tools, services, protocol APIs, container images, models, generated assets, or copied code.
Manual only. Invoked by the owner to cut a MailFathom release — composes the changelog, raises the declared version, settles the milestones and the next release's tracking issue, and states the order the two pull requests and the tag have to land in.