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Use when writing Vague (.vague) files - a declarative language for generating realistic test data with superposition, constraints, and cross-references
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Guide for advanced Next.js App Router patterns including Route Handlers, Parallel Routes, Intercepting Routes, Server Actions, error boundaries, draft mode, and streaming with Suspense. CRITICAL for server actions (action.ts, actions.ts files, 'use server' directive), setting cookies from client components, and form handling. Use when requirements involve server actions, form submissions, cookies, mutations, API routes, `route.ts`, parallel routes, intercepting routes, or streaming. Essential for separating server actions from client components.
Guide for working with Next.js App Router (Next.js 13+). Use when migrating from Pages Router to App Router, creating layouts, implementing routing, handling metadata, or building Next.js 13+ applications. Activates for App Router migration, layout creation, routing patterns, or Next.js 13+ development tasks.
Guide for Next.js App Router dynamic routes and pathname parameters. Use when building pages that depend on URL segments (IDs, slugs, nested paths), accessing the `params` prop, or fetching resources by identifier. Helps avoid over-nesting by defaulting to the simplest route structure (e.g., `app/[id]` instead of `app/products/[id]` unless the URL calls for it).
Focused pattern for fetching data using URL parameters in Next.js. Covers creating dynamic routes ([id], [slug]) and accessing route parameters in server components to fetch data from APIs. Use when building pages that display individual items (product pages, blog posts, user profiles) based on a URL parameter. Complements nextjs-dynamic-routes-params with a simplified, common-case pattern.
Use when working with OpenAPI Specification files to validate, create/modify paths and schemas, check references, and enforce best practices
Guide for Vercel AI SDK v5 implementation patterns including generateText, streamText, useChat hook, tool calling, embeddings, and MCP integration. Use when implementing AI chat interfaces, streaming responses, tool/function calling, text embeddings, or working with convertToModelMessages and toUIMessageStreamResponse. Activates for AI SDK integration, useChat hook usage, message streaming, or tool calling tasks.
| name | vague |
| description | Use when writing Vague (.vague) files - a declarative language for generating realistic test data with superposition, constraints, and cross-references |
schema Invoice {
id: unique int in 1000..9999,
status: "draft" | "sent" | "paid",
total: decimal in 100.00..5000.00,
line_items: 1..5 of LineItem,
tax: round(total * 0.2, 2),
assume total > 0
}
dataset TestData {
invoices: 100 of Invoice
}
string, int, decimal, boolean, date"a" | "b" or weighted 0.7: "a" | 0.3: "b"int in 1..100, date in 2020..20241..5 of Item or 100 of Itemtotal: sum(items.amount)assume due_date >= issued_dateany of companies where .active == true= ^parent_fieldstring? or string | nullid: unique int in 1..1000