projection-patterns — templates and worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

microservices-patterns — detailed patterns and worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

event-store-design — templates and worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

cqrs-implementation — templates and worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

architecture-patterns — detailed patterns and worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

Deep-dive implementation examples for DDD bounded contexts, Onion Architecture, Anti-Corruption Layers, and full project structures. Referenced from SKILL.md. Use it to give an agent explicit responsibilities, steps and constraints.

Master proven backend architecture patterns including Clean Architecture, Hexagonal Architecture, and Domain-Driven Design to build maintainable, testable, and scalable systems. Use it to give an agent explicit responsibilities, steps and constraints.

REST API Best Practices captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

1. Nullable vs Non-Null : Start nullable, make non-null when guaranteed 2. Input Types : Always use input types for mutations 3. Payload Pattern : Return errors in mutation payloads 4. Pagination : Use cursor-based for infinite scroll, offset for simple cases 5. Nam. Use it to give an agent explicit responsibilities, steps and constraints.

api-design-principles — detailed patterns and worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

You MUST follow these rules exactly. Violating any of them is a failure. Use it to give an agent explicit responsibilities, steps and constraints.

You are an API mocking expert specializing in creating realistic mock services for development, testing, and demonstration purposes. Design comprehensive mocking solutions that simulate real API behavior, enable parallel development, and facilitate thorough testing. Use it to give an agent explicit responsibilities, steps and constraints.

fastapi-templates — detailed worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

You are a backend system architect specializing in scalable, resilient, and maintainable backend systems and APIs. Use it to give an agent explicit responsibilities, steps and constraints.

Browse all 94 marketplace plugins organized by category: 90 local plugins plus 4 externally hosted git-subdir entries (pensyve, qa-orchestra, storymap-skill, ciagent). Use it as a repeatable review, validation or hardening pass.

Agent Skills are modular packages that extend Claude's capabilities with specialized domain knowledge, following Anthropic's Agent Skills Specification. This plugin ecosystem includes 175 local specialized skills across 48 plugins, enabling progressive disclosure and efficien. Use it as a repeatable review, validation or hardening pass.

openpyxl writes formulas as strings with no cached values . Until you recalculate, every formula cell reads back as None to anything reading cached values — pandas, load workbook(data only=True), and most previewers. Use it to make implementation decisions and avoid common dead ends.

A .pptx is a ZIP archive of XML files. Choose your approach by task:. Use it to make implementation decisions and avoid common dead ends.

This document contains advanced PDF processing features, detailed examples, and additional libraries not covered in the main skill instructions. Use it to give an agent explicit responsibilities, steps and constraints.

If you need to fill out a PDF form, first check to see if the PDF has fillable form fields. Run this script from this file's directory: python scripts/check fillable fields , and depending on the result go to either the "Fillable fields" or "Non-fillable fields" and follow thos. Use it to ground design choices in named patterns, trade-offs and examples.