Backend

This skill should be used when the user mentions "HLS not working", "haskell-language-server issues", "Haskell LSP problems", "no completions in Haskell", "HLS diagnostics not showing", "troubleshoot HLS", "Haskell code analysis not working", or asks why HLS features aren't available in Claude Code.

Use this skill when designing REST, GraphQL, or gRPC APIs. Provides comprehensive API design patterns, versioning strategies, error handling conventions, authentication approaches, and OpenAPI/AsyncAPI templates. Ensures consistent, well-documented, and developer-friendly APIs across all backend services.

Infrastructure as Code with Terraform including HCL configuration, state management,modular design, and plan-apply workflows. Covers cloud and on-prem resource provisioning,remote backends, and Terraform modules.Use when user mentions Terraform, HCL, terraform plan, terraform apply, tfstate,infrastructure as code, or IaC provisioning.

Help developers use functype functional programming patterns in their TypeScript projects. Use this skill when converting imperative/OOP code to functional patterns, looking up functype APIs and methods, handling nulls with Option, managing errors with Either/Try, or working with immutable collections like List and Set.

Implement robust error handling with user-friendly messages, specific exception types, centralized error boundaries, and graceful degradation strategies. Use this skill when implementing error handling logic in any part of the application. When writing try-catch blocks, error boundaries, or exception handlers. When validating input and failing fast with clear error messages. When handling API errors, network failures, or external service timeouts. When implementing retry strategies with exponential backoff. When ensuring resources are properly cleaned up in finally blocks. When displaying error messages to users without exposing technical details. This skill applies to all error handling across frontend and backend code.

Review and refine MCP skill descriptions to follow the agent skill specification, and record approved overrides in dev-swarm/mcp_descriptions.yaml. Use when the user asks to update one MCP skill description, all skills from a server, or all MCP skills.

This skill provides expert-level guidance for VS Code extension development. Use when implementing new extension features, debugging extension code, designing WebView UIs, implementing Language Server Protocol features, or optimizing extension performance. Covers activation events, contribution points, VS Code API patterns, security best practices, testing strategies, and publishing workflows.

Error handling patterns including exceptions, Result pattern, validation strategies, retry logic, and circuit breakers. **ALWAYS use when implementing error handling in backend code, APIs, use cases, or validation logic.** Use proactively for robust error handling, recovery mechanisms, and failure scenarios. Examples - "handle errors", "Result pattern", "throw exception", "validate input", "error recovery", "retry logic", "circuit breaker", "exception hierarchy".

This skill enables web scraping and content extraction using Firecrawl API directly via curl. Use when scraping web pages, crawling websites, or extracting structured data. MCP server not required.

This skill enables web searching using Brave Search API directly via curl. Use when searching for current information, news, articles, or web content. MCP server not required - calls API directly.

Session initialization sequence for community-patterns development. Use at the start of every Claude Code session. Checks for upstream updates, loads workspace configuration, and ensures dev servers are running.

Advanced Clippy configuration for comprehensive Rust linting with custom rules, categories, and IDE integration.Use when configuring linting rules, enforcing code standards, setting up CI linting, or customizing clippy behavior.Trigger terms: clippy, linting, code quality, clippy.toml, pedantic, nursery, restriction, lint configuration, code standards.

Use after completing a Sea of Nodes chapter implementation, before marking the chapter issue as complete. Validates implementation against official tutorial by comparing node types, test coverage, and key concepts.

Hybrid language detection algorithm for Vigil Guard v2.0.0. Use for language-detector Flask API, entity-based hints, Polish PESEL/NIP detection, 3-branch pipeline integration, accuracy troubleshooting, and langdetect integration.

Eloquent model patterns and database layer. Use when working with models, database entities, Eloquent ORM, or when user mentions models, eloquent, relationships, casts, observers, database entities.

Comprehensive testing patterns with Pest. Use when working with tests, testing patterns, or when user mentions testing, tests, Pest, PHPUnit, mocking, factories, test patterns.

Package development and extraction of reusable code. Use when working with package development, code reusability, or when user mentions packages, composer packages, extract package, reusable code, package development.

Vendure e-commerce framework for Node.js. Use for headless commerce, GraphQL APIs, order management, product catalogs, payment integration, and TypeScript e-commerce development.

Reviews LangGraph code for bugs, anti-patterns, and improvements. Use when reviewing code that uses StateGraph, nodes, edges, checkpointing, or other LangGraph features. Catches common mistakes in state management, graph structure, and async patterns.

Extracts web content and performs reliable searches when standard tools fail due to access restrictions, rate limiting, or validation errors. Use when encountering 403/429/422 errors, blocked documentation sites, or silent search failures. **Direct tool execution often fails for these scenarios - search-plus agent delegation provides the most reliable results.**