Warden

Design REST APIs including endpoints, URL structures, HTTP methods, request/response bodies, status codes, authentication, versioning, pagination, and error formats. Use this skill whenever the user wants to design an API, plan endpoints, structure a backend, decide on REST conventions, write an API spec, design request/response shapes, or asks "how should I structure this API?" Trigger on phrases like "design an API", "what endpoints do I need", "REST API for", "API structure", "request/response format", "status codes", or "API versioning".

Perform a structured, thorough code review on a file, function, snippet, or entire module. Use this skill whenever the user asks to review code, check code quality, audit a function, look for bugs, find security issues, assess readability, or wants feedback on their implementation. Trigger even if the user phrases it casually like "what do you think of this?", "is this good?", or "any issues here?" when code is present.

Design, review, and improve PostgreSQL database schemas including tables, columns, data types, indexes, constraints, foreign keys, relationships, migrations, and query optimisation. Use this skill whenever the user wants to model data, design a database, write a migration, optimise queries with indexes, normalise a schema, add pgvector support, or asks "how should I structure this in the database?" Trigger on mentions of tables, schemas, migrations, ERDs, relationships, PostgreSQL, pgvector, or database design questions.

Systematically debug errors, exceptions, unexpected behaviour, and failing tests. Use this skill whenever the user shows an error message, stack trace, wrong output, or describes something that isn't working. Trigger on phrases like "I'm getting an error", "this isn't working", "why is this failing", "I don't understand this traceback", "help me debug", "getting a TypeError/ValueError/KeyError/AttributeError", or when any stack trace or error message is present in the conversation.

Write, explain, debug, and optimise Dockerfiles and docker-compose.yml files for any language or stack. Use this skill whenever the user wants to containerise an application, write a Dockerfile, set up docker-compose, configure environment variables in containers, set up multi-stage builds, reduce image size, fix Docker build errors, or debug container networking issues. Trigger on words like "Dockerfile", "docker-compose", "containerise", "container", "docker build", "image size", "port", or "volume".

Guide git workflows including writing commit messages, structuring branches, writing PR descriptions, resolving merge conflicts, squashing commits, rebasing, tagging releases, and undoing mistakes. Use this skill whenever the user wants help with a commit message, pull request, branching strategy, git history, rebasing, undoing a commit, stashing, or anything git-related. Trigger on phrases like "write a commit message", "help me PR this", "how should I branch", "clean up my commits", "git conflict", "undo", "revert", "stash", or any git command question.

Write unit tests, integration tests, and test fixtures for any function, class, module, or API endpoint. Use this skill whenever the user wants to write tests, increase test coverage, test edge cases, set up pytest fixtures, mock external dependencies, test database operations, test an API endpoint, or debug a failing test. Trigger on phrases like "write tests for", "add unit tests", "test this function", "how do I test", "mock this", "pytest", "test coverage", "failing test", or "fixture".