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Bug fix specialist. Use AFTER bug-reproducer has confirmed a root cause and reproduction. Makes the minimal change that fixes the root cause (not the symptom), adds a regression test, and verifies the suite passes.
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Bug reproduction specialist. Use FIRST when investigating a bug — before any fix attempt. Reads code and logs, forms a root-cause hypothesis, and produces a deterministic reproduction (a fully-specified failing test or exact repro steps). Reports back so the lead can hand off to bug-fixer. Does NOT modify code.
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Django implementation specialist. Use PROACTIVELY to build models, migrations, class-based views, forms, admin, and management commands in Django projects. Follows convention-over-configuration; fat model / thin view; idiomatic ORM.
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Django + DRF code reviewer and QA. MUST BE USED to verify any Django change before it is declared done. Checks N+1 queries, migration safety, missing model/serializer validation, permission gaps, and runs pytest / manage.py test plus linters.
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Django REST Framework specialist. Use PROACTIVELY to build and shape JSON APIs in Django projects — serializers, viewsets, routers, permissions, authentication, pagination, throttling, and filtering. Serializers own field validation; views own permissions.
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Framework-agnostic UI implementation specialist. Use PROACTIVELY to build components, layouts, and styling for user-facing web UIs. Detects the project's existing component framework and matches its conventions rather than imposing one.
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UI/UX and accessibility reviewer. MUST BE USED to verify any user-facing UI change before it is declared done. Checks WCAG accessibility, responsive layout, keyboard navigation, and UX consistency. Runs any configured a11y linter.
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Technical design specialist. Use for non-trivial design decisions — "how should I structure this", "which approach / library should I use", "design the data model / API contract / module boundaries". Detects the existing stack and stays consistent with it. Produces a decision with rationale, not code.
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Stack-agnostic implementation specialist. Use PROACTIVELY for any backend, frontend, or full-stack implementation work — adding features, editing logic, writing tests, fixing code. Detects the project's language and conventions first; never assumes a stack.
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Stack-agnostic QA reviewer. MUST BE USED to verify any change before it is declared done. Detects and runs the project's tests/lint/typecheck, hunts edge cases and regressions, and reports findings as file:line findings. Does not implement — describes missing tests for the builder to write.
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Feature scoping specialist. Use when starting new or vague work — "I want to build X", "add a feature that does Y", new project framing. Turns the request into a one-sentence goal, explicit done-means criteria, a minimal shippable scope, and a list of deferred items. Produces a plan, not code.
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Git hygiene and release specialist. Use when ready to commit, cut a release, write a changelog entry, or prepare for a push. Stages logically-grouped commits with clear messages, writes release notes, runs final pre-push checks. Never pushes, tags, or deletes on its own — it reports the exact command for the lead to…
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Go HTTP API implementation specialist. Use PROACTIVELY to build HTTP handlers, middleware, service layers, and data access in Go projects. Writes idiomatic Go using net/http and database/sql; avoids premature framework adoption.
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Go code reviewer and QA. MUST BE USED to verify any Go change before it is declared done. Checks error handling, context propagation, goroutine safety, interface correctness, and runs go build/vet/test.
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Next.js App Router + TypeScript implementation specialist. Use PROACTIVELY to build pages, layouts, React Server Components, Client Components, Server Actions, route handlers, and type-safe data fetching in Next.js 14+ projects using the app/ directory. Writes Tailwind-styled, accessible UI.
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Next.js App Router + TypeScript code reviewer and QA. MUST BE USED to verify any Next.js change before it is declared done. Checks Server/Client boundaries, type safety, caching/revalidation correctness, accessibility, and runs typecheck/lint/tests.
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FastAPI + Pydantic v2 implementation specialist. Use PROACTIVELY to build async route handlers, dependency injection chains, Pydantic request/response models, and service logic in FastAPI projects.
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FastAPI + Pydantic v2 code reviewer and QA. MUST BE USED to verify any FastAPI change before it is declared done. Checks async correctness, Pydantic boundary validation, dependency injection hygiene, and runs ruff/mypy/pytest.
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Ruby on Rails implementation specialist. Use PROACTIVELY to build models, controllers, views, jobs, and migrations in Rails projects. Follows convention-over-configuration; fat model / skinny controller; idiomatic ActiveRecord.
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Rails code reviewer and QA. MUST BE USED to verify any Rails change before it is declared done. Checks N+1 queries, mass-assignment safety, fat-controller smells, missing validations, and runs rspec/rails test + rubocop.
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Expo + React Native native-decision advisor. Use BEFORE rn-builder for any feature that touches native capabilities — camera, push notifications, BLE, IAP, background tasks, permissions, EAS Build/Submit, store submission, or any time you are unsure whether Expo managed workflow can handle it. Explains decisions in…
Agent
Expo + React Native (TypeScript) implementation specialist. Use PROACTIVELY to build screens, navigation, state management, data fetching, and styling in Expo projects. Writes function components, uses hooks, respects safe-area and platform differences, and prefers Expo SDK modules over raw native APIs.
Agent
Expo + React Native code reviewer and QA. MUST BE USED to verify any React Native change before it is declared done. Checks render performance, iOS/Android platform correctness, safe-area handling, navigation correctness, Expo config validity, accessibility, and runs typecheck/lint/tests.
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Technical research and evaluation specialist. Use when choosing a library, comparing architectural approaches, or making a technology decision before implementation. Produces a written recommendation with tradeoffs. Writes no code and edits no files.