Scripting

Expert WordPress developer specializing in theme development, plugin architecture, and performance optimization. Masters both classic PHP development and modern block-based solutions, delivering scalable WordPress sites from simple blogs to enterprise platforms.

Expert Python developer specializing in modern Python 3.11+ development with deep expertise in type safety, async programming, data science, and web frameworks. Masters Pythonic patterns while ensuring production-ready code quality.

Write TypeScript runtime and type tests (project)

Designs Zod schemas following Zod-first development. Creates validation schemas, branded types, discriminated unions, and transforms. Infers TypeScript types from schemas. Triggers on: Zod schema, z.object, z.infer, validation, branded types, discriminated union, safeParse, refinement.

Runs quality gate checks before commit or push. Executes lint fixes, TypeScript compilation, tests, and CI validation. Reproduces CI failures locally. Triggers on: pre-commit, pre-push, quality check, CI check, lint check, type check, validate changes, check:fix, pnpm test.

Run test coverage analysis, identify missed and partial lines, and write tests to improve coverage. Use this when the user asks to check coverage, improve coverage, or write tests for uncovered code. This skill detects both completely missed lines and partially covered lines (executed but missing branch coverage) to match Codecov analysis.

Browser automation, debugging, and performance analysis using Puppeteer CLI scripts. Use for automating browsers, taking screenshots, analyzing performance, monitoring network traffic, web scraping, form automation, and JavaScript debugging.

Writes, reviews, and refactors Python code following modern best practices. Specialises in Python 3.12+, uv for project management, type hints, polars over pandas, pydantic for validation, and pytest for testing. Use when working with Python code.

Introspect and analyze software architectures using first principles thinking, SpaceX's 5-step engineering methodology (Question, Delete, Simplify, Accelerate, Automate), and software modularity principles. This skill should be used when analyzing existing architectures, evaluating architectural decisions, identifying technical debt, planning refactoring efforts, or assessing whether architectural patterns are justified.

Skill professionnel pour Claude Code permettant d'accéder, télécharger et analyser les données ouvertes françaises via data.gouv.fr. Inclut une librairie Python complète, des exemples de code, et une documentation détaillée des datasets les plus utilisés.

Testing philosophy and practices. This skill should be used when writing tests, designing test strategies, or reviewing test code. Use proactively when discussing TDD, red-green-refactor, test doubles, mocks, stubs, fakes, RSpec, Jest, pytest, unit tests, integration tests, test coverage, or test-first development. (user)

This skill should be used when creating a Claude Code slash command. Use when users ask to "create a command", "make a slash command", "add a command", or want to document a workflow as a reusable command. Essential for creating optimized, agent-executable slash commands with proper structure and best practices.

This skill should be used when editing Python code for Python 3.10-3.12. Use when writing, reviewing, or refactoring Python to ensure adherence to LBYL exception handling patterns, pathlib operations, ABC-based interfaces, absolute imports, and explicit error boundaries at CLI level. Essential for maintaining dignified Python standards.

Coding standards discovery and documentation expert. Analyzes codebase to detect naming conventions, patterns, anti-patterns, and best practices. Generates or updates coding standards documentation in .specweave/docs/internal/governance/. Detects ESLint/Prettier configs, analyzes TypeScript/JavaScript patterns, finds security issues, and creates evidence-based standards with confidence levels. Activates for analyze coding standards, discover conventions, code style analysis, detect patterns, coding guidelines, what are the standards, code quality check, naming conventions, linting rules, best practices analysis, standards audit, code review standards, detect anti-patterns.

Python coding standards with automatic version detection. Use when writing, reviewing, or refactoring Python to ensure adherence to LBYL exception handling patterns, modern type syntax (list[str], str | None), pathlib operations, ABC-based interfaces, absolute imports, and explicit error boundaries at CLI level. Also provides production-tested code smell patterns from Dagster Labs for API design, parameter complexity, and code organization. Essential for maintaining erk's dignified Python standards.

Non-testing browser automation - web scraping, form filling, screenshot capture, PDF generation, workflow automation. For TESTING with Playwright, use e2e-playwright skill instead. Activates for web scraping, form automation, screenshot, PDF, headless browser, Puppeteer, Selenium, automation scripts, data extraction.

Initializes Nix flake.nix files for projects using flake-parts, automatically detecting programming languages (OpenSCAD, Python) and configuring appropriate development shells. Activates when user asks to create, initialize, or add a flake.nix, set up Nix development environment, or add direnv support.

Move, rename, or delete GDScript files with their .uid files for Godot projects. Use when reorganizing code, renaming scripts, or removing unused GDScript files.

Software design principles and patterns. This skill should be used when making architectural decisions, designing classes or modules, or evaluating code structure. Use proactively when discussing SOLID principles, coupling, cohesion, connascence, refactoring structure, class design, module boundaries, dependency injection, or the Four Rules of Simple Design. (user)

Creates self-contained Python scripts with inline PEP 723 metadata for UV. Embeds dependencies directly in script headers for zero-config execution via `uv run`. Triggers on keywords: uv script, single file script, inline dependencies, PEP 723, self-contained python, uv run script, standalone script