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sigma-engineering

Name: sigma-engineering
Author: sigmadigitalza

By sigmadigitalza

Sigma Digital's engineering playbook — review skills covering API design, code review, database schema and migrations, documentation, frontend accessibility, GitHub Actions, incident postmortems, web performance, web security, and web SRE.

npx claudepluginhub sigmadigitalza/engineering-playbook --plugin sigma-engineering

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What's Inside

Skills10

code-review

/code-review

Reviews code changes for defects, design issues, and codebase coherence using a severity-ordered rubric and Conventional Comments. Use this whenever the user asks for a code review, a PR review, a pre-PR self-review, or wants feedback on a diff or branch — even when they only say 'review this' or 'look at this PR'.

api-design-review

/api-design-review

Reviews REST and GraphQL API designs for contract quality, error shape, idempotency, versioning, pagination, and backwards-compatibility risk. Use this whenever the user is designing a new API, modifying an existing endpoint, reviewing an OpenAPI or GraphQL schema diff, or asks for an API design review — even if they don't explicitly mention 'the API design playbook'.

database-review

/database-review

Reviews relational database work — schema design for new tables and relationships, online-safe migrations (locks, backfills, expand/contract, rollback), and query/index performance under load. Postgres-biased with explicit MySQL and SQLite call-outs. Use this whenever the user is reviewing a migration file, designing a new table, debugging a slow query, asking about indexes, or modifying schema — even if they don't say 'database review'.

documentation-review

/documentation-review

Reviews technical documentation for clarity, accuracy, structure, and agent-readability while preserving the author's voice. Use this whenever the user is reviewing a README, design doc, runbook, ADR, contributor guide, or any markdown documentation — or asks for feedback on docs — even if they don't say 'documentation review'.

frontend-accessibility-review

/frontend-accessibility-review

Reviews web frontends for WCAG 2.2 Level AA accessibility — semantic HTML, ARIA, keyboard interaction, screen reader experience, color contrast, forms, motion, and internationalization. Use this whenever the user is reviewing a UI component, building a form, auditing a page for a11y, asks about ARIA or screen readers, or asks for an accessibility review — even if they don't explicitly mention WCAG.

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Version0.1.0

LanguageTypeScript

Stars0

MaintenanceGood

LicenseMIT

Last CommitMay 2, 2026

AddedMay 2, 2026

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sigma-engineering-playbook1

README

Engineering Playbook

Guides, prompts, and technical reference material for the engineering team at Sigma Digital.

This repo is the canonical home for how we build, review, and operate software. It pairs human-readable playbooks (the principles, checklists, and procedures we follow) with matching prompts (the LLM-ready versions of those playbooks, designed to run reviews and audits with an AI assistant).

Install as a Claude Code plugin

The playbooks and prompts in this repo are also packaged as a Claude Code plugin. Skills auto-activate when you ask Claude to do relevant work — for example, "review this PR for security issues" will fire the web-security skill automatically.

/plugin marketplace add sigmadigitalza/engineering-playbook
/plugin install sigma-engineering@sigma-engineering-playbook
/reload-plugins

The same skills work with GitHub Copilot — copy any folder from plugins/sigma-engineering/skills/ into your repo's .github/skills/ directory, or into ~/.copilot/skills/ for personal scope. The SKILL.md format is a cross-vendor open standard.

Playbooks — `docs/playbooks`

Long-form guides describing how we approach a discipline, what "good" looks like, and the specific checks and procedures we run.

Playbook	What it covers
API design review	REST and GraphQL contract design, error shape, idempotency, versioning, and backwards-compatibility risk.
Code review	Sigma's posture, severity-ordered rubric, and Conventional Comments convention for PR review and pre-PR self-review.
Database review	Schema design, online-safe migrations, and query/index performance review for relational databases.
Documentation review	Standards and checks for technical documentation quality, structure, and accuracy.
Frontend accessibility review	WCAG 2.2 AA review of web frontends — semantic HTML, ARIA, keyboard, screen reader, contrast, forms, motion, i18n.
GitHub Actions review	Workflow design, security, and reliability practices for CI/CD pipelines.
Incident postmortem	Blameless postmortem template, drafting and review rubric for post-incident reviews.
Web performance	Core Web Vitals audit, lab-vs-field discipline, and quick-win optimisations for web applications.
Web security	Threat model, hardening checklist, and review procedure for web applications.
Web SRE	Reliability, observability, and incident-response practices for web services.

Prompts — `docs/prompts`

Each playbook has a paired prompt designed to be handed to an LLM (Claude, ChatGPT, etc.) to run the review autonomously against a codebase, PR, or artefact.

Prompt	Pairs with
API design review	API design review playbook
Code review	Code review playbook
Database review	Database review playbook
Documentation review	Documentation review playbook
Frontend accessibility review	Frontend accessibility review playbook
GitHub Actions review	GitHub Actions review playbook
Incident postmortem	Incident postmortem playbook
Web performance	Web performance playbook
Web security	Web security playbook
Web SRE	Web SRE playbook

How to use this repo

Onboarding — read the relevant playbook for the discipline you're working in.
Reviews — pull the matching prompt into your AI assistant of choice and point it at the artefact you want reviewed (a PR, a workflow file, a service, etc.).
Improving the playbooks — these are living documents. Open a PR with corrections, additions, or new playbooks for disciplines we haven't covered yet.

Contributing

View full README on GitHub

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