Build a walkthrough the user works through until they can pass a quiz on it. Use when the user needs to understand something deeply and be quizzed on it.

Lets an agent authenticate to APIs and MCP servers WITHOUT ever seeing secret values. Use whenever a task needs an API token, MCP token, password, or key. The agent passes a credential *reference* (a name); a trusted non-LLM broker resolves it from the OS keyring, injects it into the request, scrubs the response, and returns only scrubbed output. The secret value never enters the agent's context or the LLM.

Builds and parses structured retrospective artifact folders for troubleshooting, incident review, and delivery retros. Use this skill when capturing session context, synthesizing external context (GitHub, Jira, Mattermost, logs), querying prior retrospectives, or preparing downstream inputs for OKB entries, postmortems, and agent/skills/instruction improvements.

Performs comprehensive documentation review including build validation, Diataxis analysis, structure audit, accuracy verification, and style compliance. Use when reviewing documentation changes or auditing documentation quality.

Generates a complete Ubuntu SRU Bug Description template ([Impact], [Test Plan], [Where problems could occur]) using interactive human guidance to filter out noise. Trigger phrases: "sru template", "ubuntu sru description", "write sru bug".

Test skill containing EICAR test file for malware detection

Generate a self-contained JavaScript server runtime and registration metadata for an MCP codeful tool. Use when the user asks to create a codeful MCP tool, generate server logic for an MCP tool, write a runTool function, build a Dataverse-backed MCP tool, or pair MCP server logic with an MCP App widget.

Test Havok physics system (gravity, rigid bodies, static vs dynamic) against the physics example using the iwsdk CLI.

Generative Engine Optimization (GEO) specialist — the technical, on-page publishing work that makes a given page or site discoverable, understandable, trustworthy, quotable, and fresh for AI answer engines (Google AI Overviews, ChatGPT Search, Bing Copilot, Perplexity). Use when asked to 'optimize this page/site for GEO', 'optimize for AI search / answer engines', 'get my page cited by ChatGPT/Perplexity', 'improve AI visibility/citability', 'write an llms.txt', 'add citation-ready structure or schema for AI answers', 'otimizar para busca com IA', or to audit/create/improve a codebase for generative search. Do NOT use for AI-driven SEO content strategy or programmatic pages at scale (use ai-seo), classic keyword/SERP ranking (use seo), accessibility (use web-accessibility), or multi-area site audits (use web-quality-audit).

**WORKFLOW SKILL** — Migrate Web Forms data access and architecture to Blazor Server. Covers EF6→EF Core with IDbContextFactory, Session→SessionShim, Global.asax→Program.cs, Web.config→appsettings.json, DataSource controls→service injection. WHEN: "migrate EF6", "session state to services", "Global.asax to Program.cs", "data access migration", "SelectMethod to delegate". INVOKES: dotnet CLI for EF migrations. FOR SINGLE OPERATIONS: use bwfc-migration for markup, bwfc-identity-migration for auth.

Start a Ralph Loop for iterative self-referential development. Use when the user asks to run a ralph loop, start an iterative loop, or wants repeated autonomous iteration on a task until completion.

Render a documentation-style Cursor Canvas that organizes architecture notes, API references, walkthroughs, and how-tos into a navigable layout with sections, tables of contents, and cross-references. Use when the user asks for a docs canvas, documentation overview, architecture walkthrough, API reference page, or wants to render structured documentation as an interactive canvas.

Build or adapt a local browser/CDP harness to drive and inspect a web, IDE, or Electron UI. Use for local UI verification, screenshots, accessibility snapshots, perf profiles, visual diffs, or reproducing UI bugs.

Audit a Cursor plugin for marketplace readiness. Use when validating manifests, component metadata, discovery paths, and submission quality before publishing.

Checklist and automation guide for adding a new skill to the OPC Skills project. Ensures all required files, metadata, logos, and listings are created before release. Use when adding a new skill, publishing a skill, or preparing a skill for release.

Browser automation and E2E testing with Playwright. Auto-detects dev servers, writes clean test scripts. Test pages, fill forms, take screenshots, check responsive design, validate UX, test login flows, check links, automate any browser task. Use for cross-browser testing, visual regression, API testing, component testing in TypeScript/JavaScript and Python projects.

OAuth 2.0 and OpenID Connect authentication with secure flows. Use for third-party integrations, SSO systems, token-based API access, or encountering authorization code flow, PKCE, token refresh, scope management errors.

Expert guidance for writing secure, reliable, and performant Claude Code hooks - validates design decisions, enforces best practices, and prevents common pitfalls. Use when creating, reviewing, or debugging Claude Code hooks.

Interact with Gmail - search emails, read messages, send emails, create drafts, and manage labels. Use when user asks to: search email, read email, send email, create email draft, mark as read, archive email, star email, or manage Gmail labels. Lightweight alternative to full Google Workspace MCP server with standalone OAuth authentication.

Read and write Google Slides presentations - get text, find presentations, create presentations, add slides, replace text, and manage slide content. Use when user asks to: read a presentation, create slides, find slides, add a slide, replace text in a presentation, or manage presentation content. Lightweight integration with standalone OAuth authentication supporting full read/write access.