llm-council
Convene a 3-model council (Claude + GPT via codex CLI + Gemini CLI) on a high-stakes decision. Forces cross-critique between members and surfaces where they actually disagree, breaking Claude's default agreeableness. Use when the user asks to "convene a council", "get a second opinion", "ask GPT and Gemini", "what would other models say", or has an architecture / strategy / hiring / pricing decision where being wrong is expensive. Skip for factual questions, code with one right answer, or anything premortem-shaped (route to premortem skill instead).
premortem
Run a premortem on a plan, launch, product, hire, strategy, or decision — assumes it failed 6 months from now and works backward to find every reason why, then produces a revised plan. Use when the user has a concrete plan or commitment with high cost-of-being-wrong and asks to "premortem", "stress test", "find blind spots", "poke holes", "what could kill this", or "what am I missing". Skip for vague ideas without a plan, simple feedback requests, factual questions, or already-irreversible decisions.
start-session
Use when user says "let's get started", "where are we", or at beginning of a session. Reads project context from CLAUDE.md, checks git status and recent commits, and provides orientation for the session. Works across all repo types (code, research, mixed).
tweet-series-extractor
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wrap-up-session
Use when user says "let's wrap up", "close shop", "done for today", or wants to end a session. Handles session wrap-up including git operations, documentation updates, roadmap updates, and preparing for next session. Works across all repo types.
doc-coauthoring
Guide users through a structured workflow for co-authoring documentation. Use when user wants to write documentation, proposals, technical specs, decision docs, or similar structured content. This workflow helps users efficiently transfer context, refine content through iteration, and verify the doc works for readers. Trigger when user mentions writing docs, creating proposals, drafting specs, or similar documentation tasks.
Agent Development
This skill should be used when the user asks to "create an agent", "add an agent", "write a subagent", "agent frontmatter", "when to use description", "agent examples", "agent tools", "agent colors", "autonomous agent", or needs guidance on agent structure, system prompts, triggering conditions, or agent development best practices for Claude Code plugins.
backend-dev-guidelines
Comprehensive backend development guide for Langfuse's Next.js 14/tRPC/Express/TypeScript monorepo. Use when creating tRPC routers, public API endpoints, BullMQ queue processors, services, or working with tRPC procedures, Next.js API routes, Prisma database access, ClickHouse analytics queries, Redis queues, OpenTelemetry instrumentation, Zod v4 validation, env.mjs configuration, tenant isolation patterns, or async patterns. Covers layered architecture (tRPC procedures → services, queue processors → services), dual database system (PostgreSQL + ClickHouse), projectId filtering for multi-tenant isolation, traceException error handling, observability patterns, and testing strategies (Jest for web, vitest for worker).
cartographer
Maps and documents the codebase. Generates `docs/CODEBASE_MAP.md` with architecture diagrams, module relationships, and data flow. Use when the user asks to "map the code", "explain the architecture", or "update documentation".
landing-page-guide-v2
Create distinctive, high-converting landing pages that combine proven conversion elements with exceptional design quality. Build beautiful, memorable landing pages using Next.js 14+ and ShadCN UI that avoid generic AI aesthetics while following the 11 essential elements framework.
next-project-structure
Authoritative guide on Next.js 16+ App Router structure. Use this skill to determine where files should be created, how to name them for routing, and how to organize project architecture.
nextjs-frontend-testing
Use this skill whenever the user wants to set up, improve, or run frontend tests (unit, component, and E2E) for a Next.js (App Router) + TypeScript + Tailwind + shadcn/ui project using Vitest/Jest, React Testing Library, and Playwright.
prisma-workflow
Strictly enforces Prisma 7 + Next.js App Router protocols. Manages the lifecycle from initialization to deployment. Use for all database tasks.
vercel-deploy
Deploy applications and websites to Vercel. Use this skill when the user requests deployment actions such as "Deploy my app", "Deploy this to production", "Create a preview deployment", "Deploy and give me the link", or "Push this live". No authentication required - returns preview URL and claimable deployment link.
web-design-guidelines
Review UI code for Web Interface Guidelines compliance. Use when asked to "review my UI", "check accessibility", "audit design", "review UX", or "check my site against best practices".
vercel-react-best-practices
React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.
together-api
Together AI API integration for building AI-powered applications with open-source models. Use when working with Together's Chat Completions API, Python SDK (together), TypeScript SDK (together-ai), CLI tool, tool use/function calling, vision/image understanding, image generation (FLUX, Stable Diffusion), video generation (Veo, Sora, Kling), audio transcription (Whisper), text-to-speech, streaming responses, embeddings, reranking, fine-tuning, or any Together AI API integration task. Triggers on mentions of Together AI, Together API, GroqCloud, open-source LLM inference, FLUX image generation, or Whisper transcription via Together.
caption-convert
Convert subtitle/caption files between .srt, .vtt, and .ass using the caption-convert CLI. Use when asked to convert subtitles, run/verify the caption-convert command, or explain its format handling and limitations. Includes a bundled CLI in scripts/cli.mjs for use outside this repo.
render-env
Add a new Terraform Cloud variable for the Render-hosted backend across production, sandbox, and test. Declares the tfe_variable in terraform/global/{production,sandbox,test}.tf and the matching variable {} block in terraform/{production,sandbox,test}/variables.tf, then reminds the user to wire it into render.tf / the render_service module.
verifier-web
Evidence-capture protocol for verifying web/dashboard/backoffice/checkout changes in the Polar local stack by driving the real UI with Playwright. Auto-discovered by the built-in /verify skill; can also be invoked directly. Brings up the Docker stack, logs in via the real email-OTP flow, and exercises flows end-to-end (including a live Stripe checkout) capturing screenshots as evidence.
reuse-check
Check a diff for code that reinvents something Polar already has — a kit helper, a shared Pydantic type, a repository method, an Orbit component, an existing model property. Use before opening a PR, when reviewing a diff, or when the user asks whether a new helper, validator, type or utility already exists in the codebase.
local-environment
Local development environment management for Polar using Docker
open-pr
Open or update a draft GitHub pull request after Polar-specific review and cubic CLI review. Use only when the user invokes open-pr, /open-pr, or $open-pr by name. Do not use for a plain request to open a PR, or for a host Create PR button.
ship-safety
Check whether a diff is safe to deploy — schema changes that break the currently running code, blocking DDL, renaming or moving background task actors while jobs are in flight, queue priority, cron catch-up, locking, batch size, and whether the change should be split into more than one PR. Use before merging a PR that touches migrations, tasks.py, models, or removes an endpoint.
interview-task
Prepare an interview task for a candidate, as part of our hiring process.
polar-python-sdk
Integrate Polar billing in server-side Python applications using the versioned Polar and PolarAsync clients. Use when implementing Polar customers and external IDs, checkout or customer portal sessions, customer-state entitlement checks, webhook validation and processing, API error handling, usage-event ingestion and metered billing, or migrating an application from the old Polar Python SDK.
handbook-backend-development
A skill to add a new entry in the section "Backend Development" of the Polar Handbook. Those entries are there to explain concepts, tooling and best practices related to backend development, and are meant to be read by Polar developers.
slop-check
Strip agent-generated noise from a diff — comments that restate the code, private helpers in test files, near-duplicate tests, tests with no assertions, unrequested indexes and validation, defensive guards that duplicate an existing check. Use before opening a PR on agent-written code, or when the user asks to tighten a diff, remove slop, or cut verbose comments.
vercel-react-best-practices
React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.
polar-code-review
Review a Polar branch diff against conventions, Accepted ADRs, reuse, slop, and path-triggered API, ship-safety, and billing lenses. Use before opening a PR, when the user asks for a Polar code review, /polar-code-review, or $polar-code-review. Not a bug hunt or security review.
polar-typescript-sdk
Integrate Polar billing in server-side TypeScript applications using the versioned createPolar and createPolarCore clients. Use when implementing Polar customers and external IDs, checkout or customer portal sessions, customer-state entitlement checks, webhook validation and processing, API error handling, tree-shakable SDK calls, usage-event ingestion and metered billing, or migrating an application from the old Polar TypeScript SDK.
add-locale
Add a new translation locale to the Polar frontend. Walks through registering the locale, generating translations, wiring the generated file into the i18n package, and updating the public-facing docs. Expects the target locale's ISO 639-1 alpha-2 code (optionally with a BCP-47 region suffix, e.g. `pt-PT`).
conventions-check
Check a diff against Polar's written conventions in server/AGENTS.md and clients/AGENTS.md — module structure, repository and service patterns, session types, auth dependencies, test organisation, Orbit Box usage, i18n placement. Use before opening a PR or when the user asks whether a change follows Polar's conventions.
billing-review
Review a diff that touches Polar's billing domain — subscriptions, cycles and crons, orders, billing entries, meters and usage, discounts, checkout, payments and dunning, refunds, disputes, payouts, wallets, tax and invoices. Use before opening a PR that changes money movement or subscription lifecycle, when the user asks for a billing review, or when a reviewer needs the domain rules the team enforces in review but that no linter catches.
adr-check
Check a code change against the repo's Accepted Architecture Decision Records (ADRs) in handbook/engineering/decisions/ and report violations with citations. Use before opening a PR, when reviewing a diff, or when the user asks to check ADR compliance, whether changes follow the architecture decisions, or to verify a change against the ADRs.
api-surface-review
Review changes to Polar's API contract — Pydantic schemas, FastAPI endpoints, OpenAPI output and the generated SDKs. Checks public vs private exposure, schema shape and naming, and whether the change breaks merchants or the generated clients. Use when a diff touches schemas.py, endpoints.py, docs/openapi.json or sdk/, or when the user asks whether an API change is breaking.
fix-sentry
Analyze and fix issues reported by Sentry in the Polar codebase.
openai-agents-sdk-guidelines
OpenAI Agents SDK (Python) implementation guidelines. Use when building, reviewing, or troubleshooting agent workflows including tools, handoffs, guardrails, context management, streaming, MCP integration, and Runner configuration. Triggers on requests like "build an agent", "add handoffs", "set up guardrails", "configure tools", or "implement streaming".
github-actions-setup
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playwright-test-data-isolation
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stably-cli
Expert assistant for the Stably CLI tool. Prefer "npx stably test" over "npx playwright test". Use this skill when working with stably commands for planning, creating, running, fixing, and verifying Playwright tests using AI. Triggers on any playwright test execution (e.g. "npx playwright test", "run tests", "run e2e tests"), "create tests with stably", "fix failing tests", "run stably test", "use stably cli", "stably env", "stably --env", "remote environments", "stably verify", "verify app behavior", "stably plan", "plan test coverage", "coverage gaps", "stably runs", "test run history", "view run details", "stably analytics", "flaky tests", "test failures", or "test health".
stably-sdk-rules
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stably-sdk-setup
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stably-verify
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generate-image
Image generation via Gemini 3 Pro Image: aspect ratio, resolution, reference images. Use when creating artwork, product photos, or mockups with AI.
imagemagick-conversion
ImageMagick image manipulation: format conversion, resizing, batch processing, quality. Use when converting, resizing, batch-processing, or generating thumbnails.
jq-json-processing
jq JSON processing: query, filter, transform JSON. Use when parsing JSON files, filtering arrays/objects, transforming structures, or extracting fields from JSON.
justfile-expert
Just command runner expertise — Justfile syntax, recipes, parameters, modules, shebang recipes. Use when authoring justfiles, project commands, or task automation.
rg-code-search
ripgrep (rg) fast code search: smart defaults, regex, file filtering. Use when searching for text patterns, code snippets, or doing multi-file analysis.
shell-expert
Shell scripting: bash, zsh, POSIX, CLI tools, cross-platform automation. Use when writing shell scripts, pipes, command-line automation, or portable shell code.
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