lang-elm-dev
Foundational Elm development patterns covering The Elm Architecture (TEA), type-safe frontend development, and core language features. Use when building Elm applications, understanding functional patterns in web development, working with union types and Maybe/Result, or needing guidance on Elm tooling and ecosystem.
lang-elm-library-dev
Elm-specific library/package development patterns. Use when creating Elm packages, designing pure functional APIs, configuring elm.json for libraries, writing documentation comments, publishing to package.elm-lang.org, or managing semantic versioning in pure functional context. Extends meta-library-dev with Elm tooling and ecosystem patterns.
lang-erlang-dev
Foundational Erlang patterns covering OTP behaviors, fault-tolerant systems, distributed computing, pattern matching, processes, and supervision trees. Use when writing Erlang code, building concurrent systems, working with OTP frameworks, or developing distributed fault-tolerant applications. This is the entry point for Erlang development.
lang-erlang-library-dev
Erlang-specific library development patterns. Use when creating OTP libraries, designing public APIs with process patterns, configuring rebar3, managing application resources, publishing to Hex, or writing EDoc. Extends meta-library-dev with Erlang/OTP tooling and idioms.
lang-fsharp-dev
Foundational F# patterns covering functional-first programming, type providers, computation expressions, and domain modeling. Use when writing F# code, understanding functional patterns, working with type providers, or building .NET applications with F#. This is the entry point for F# development.
lang-fsharp-library-dev
F#-specific library development patterns. Use when creating F# libraries, designing functional APIs, configuring .fsproj and NuGet packages, writing XML documentation, ensuring C# interop, or publishing to NuGet. Extends meta-library-dev with F# tooling and functional idioms.
lang-go-dev
Foundational Go patterns covering types, interfaces, goroutines, channels, and common idioms. Use when writing Go code, understanding Go's concurrency model, or needing guidance on which specialized Go skill to use. This is the entry point for Go development.
lang-go-library-dev
Go-specific library/package development patterns. Use when creating Go libraries, designing public APIs with Go idioms, configuring go.mod, managing module versioning, publishing packages, or writing package documentation. Extends meta-library-dev with Go tooling and ecosystem practices.
lang-haskell-dev
Foundational Haskell patterns covering pure functional programming, type system, type classes, monads, and common idioms. Use when writing Haskell code, understanding pure functions, working with Maybe/Either, leveraging the type system, or needing guidance on functional programming patterns. This is the entry point for Haskell development.
lang-haskell-library-dev
Haskell-specific library development patterns. Use when creating Haskell libraries, designing type-safe public APIs, organizing Cabal/Stack projects, writing property-based tests with QuickCheck, generating Haddock documentation, or publishing to Hackage. Extends meta-library-dev with Haskell tooling and idioms.
lang-java-dev
Foundational Java patterns covering core syntax, object-oriented programming, generics, collections, streams, lambdas, and modern Java features. Use when writing Java code, understanding the type system, working with collections/streams, or needing guidance on which specialized Java skill to use. This is the entry point for Java development.
lang-java-library-dev
Java-specific library development patterns. Use when creating Java libraries, designing public APIs with interfaces and abstractions, configuring Maven/Gradle projects, managing dependencies, writing JUnit tests, documenting with Javadoc, or publishing to Maven Central. Extends meta-library-dev with Java tooling and ecosystem practices.
lang-kotlin-dev
Foundational Kotlin patterns covering null safety, coroutines, data classes, extension functions, and Kotlin idioms. Use when writing Kotlin code or needing guidance on Kotlin development. This is the entry point for Kotlin development.
lang-objc-dev
Foundational Objective-C patterns covering classes, protocols, categories, memory management (ARC/retain-release), blocks, GCD, and Foundation framework. Use when writing Objective-C code, working with Cocoa/Cocoa Touch APIs, bridging to Swift, or needing guidance on Apple platform development patterns. This is the entry point for Objective-C development.
lang-objc-library-dev
Objective-C-specific library and framework development patterns. Use when creating reusable frameworks, designing public APIs with protocols and categories, configuring Podspecs/Cartfiles/Package.swift, managing header visibility, implementing XCTest suites, writing HeaderDoc/appledoc documentation, or publishing to CocoaPods/Carthage/SPM. Extends lang-objc-dev with framework tooling and distribution practices.
lang-python-dev
Foundational Python patterns covering core syntax, idioms, type hints, testing, and modern tooling. Use when writing Python code, understanding Pythonic patterns, working with type hints, or needing guidance on which specialized Python skill to use. This is the entry point for Python development.
lang-python-library-dev
Python-specific library/package development patterns. Use when creating Python packages, designing public APIs with Python idioms, configuring pyproject.toml, managing dependencies with uv, publishing to PyPI, or writing package documentation. Extends meta-library-dev with Python tooling and ecosystem practices.
lang-roc-dev
Foundational Roc patterns covering platform/application architecture, records, tags, pattern matching, abilities, and functional idioms. Use when writing Roc code, understanding the platform model, or needing guidance on which specialized Roc skill to use. This is the entry point for Roc development.
lang-roc-library-dev
Roc-specific library and platform development patterns. Use when creating reusable Roc packages, developing custom platforms, organizing package modules, exposing public APIs, managing platform interfaces, or publishing packages. Extends meta-library-dev with Roc's unique platform system and module patterns.
benchmarking
Run and manage performance benchmarks with cargo xtask bench for facet-json, analyzing results with Markdown reports and comparing against serde_json baseline
managing-cargo-dependencies
Cargo.toml dependency management patterns for HASH workspace. Use when adding, updating, or removing dependencies, organizing Cargo.toml sections, configuring version pinning and default features, or managing public dependencies.
lang-rust-dev
Foundational Rust patterns covering core syntax, traits, generics, lifetimes, and common idioms. Use when writing Rust code, understanding ownership basics, working with Option/Result, or needing guidance on which specialized Rust skill to use. This is the entry point for Rust development.
lang-rust-docs-dev
Rust documentation practices for HASH codebase. Use when writing doc comments, documenting functions/types/traits/modules, creating error sections, using intra-doc links, following rustdoc conventions, or exploring crate APIs with cargo doc.
handling-rust-errors
HASH error handling patterns using error-stack crate. Use when working with Result types, Report types, defining custom errors, propagating errors with change_context, adding context with attach, implementing Error trait, or documenting error conditions in Rust code.
lang-rust-library-dev
Rust crate and library development patterns covering Cargo.toml for libraries, crate structure, module organization, rustdoc, publishing to crates.io, feature flags, semantic versioning, and API design. Use when creating a Rust library or crate, publishing to crates.io, documenting APIs with rustdoc, or managing library features and versions. This is the specialized skill for Rust library/crate development.
memory-safety-patterns
Implement memory-safe programming with RAII, ownership, smart pointers, and resource management across Rust, C++, and C. Use when writing safe systems code, managing resources, or preventing memory bugs.
lang-rust-profiling-eng
Profile and debug Rust code using valgrind and callgrind with nextest integration. Use when debugging crashes, segfaults, memory errors, analyzing instruction counts, cache behavior, or identifying performance bottlenecks.
lang-scala-dev
Foundational Scala patterns covering immutability, pattern matching, traits, case classes, for-comprehensions, and functional programming. Use when writing Scala code, understanding the type system, or needing guidance on which specialized Scala skill to use. This is the entry point for Scala development.
lang-sparql-dev
Foundational SPARQL patterns covering RDF querying, triple patterns, graph patterns, and semantic web fundamentals. Use when querying RDF data or working with knowledge graphs. This is the entry point for SPARQL development.
lang-sql-dev
Foundational SQL patterns for query writing, schema design, and dialect differences. Use when writing SQL queries, designing database schemas, understanding SQL syntax across PostgreSQL/MySQL/SQLite, or preparing SQL for conversion to other query languages. This is a meta-skill for SQL derivatives.
lang-swift-dev
Foundational Swift development patterns covering modern Swift syntax, SwiftUI, protocol-oriented programming, and Cocoa Touch frameworks. Use when writing Swift code, building iOS/macOS/watchOS/tvOS applications, working with SwiftUI or UIKit, understanding Swift concurrency, or needing guidance on Swift project structure.
lang-swift-library-dev
Swift package development with SPM. Use for Package.swift, public APIs, DocC, XCTest, XCFrameworks, and library publishing. Extends meta-library-dev.
lang-typescript-dev
Foundational TypeScript patterns covering types, interfaces, generics, utility types, and common idioms. Use when writing TypeScript code, understanding the type system, or needing guidance on which specialized TypeScript skill to use. This is the entry point for TypeScript development.
lang-typescript-library-dev
TypeScript-specific library/package development patterns. Use when creating npm packages, configuring package.json exports, setting up tsconfig.json for libraries, generating declaration files, publishing to npm, or configuring ESM/CJS dual packages. Extends meta-library-dev with TypeScript tooling and ecosystem patterns.
lang-typescript-patterns-dev
TypeScript development guidelines and patterns. Use this skill when writing TypeScript code, creating React components with TypeScript, configuring tsconfig.json, using advanced types like generics or utility types, or when the user asks about TypeScript best practices.
llm-mcp-builder-dev
Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).
perplexity-search
Perform AI-powered web searches with real-time information using Perplexity models via LiteLLM and OpenRouter. This skill should be used when conducting web searches for current information, finding recent scientific literature, getting grounded answers with source citations, or accessing information beyond the model's knowledge cutoff. Provides access to multiple Perplexity models including Sonar Pro, Sonar Pro Search (advanced agentic search), and Sonar Reasoning Pro through a single OpenRouter API key.
mcp-research
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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.
Command Development
This skill should be used when the user asks to "create a slash command", "add a command", "write a custom command", "define command arguments", "use command frontmatter", "organize commands", "create command with file references", "interactive command", "use AskUserQuestion in command", or needs guidance on slash command structure, YAML frontmatter fields, dynamic arguments, bash execution in commands, user interaction patterns, or command development best practices for Claude Code.
context-degradation
Recognize, diagnose, and mitigate patterns of context degradation in agent systems. Use when context grows large, agent performance degrades unexpectedly, or debugging agent failures.
context-fundamentals
Understand the components, mechanics, and constraints of context in agent systems. Use when designing agent architectures, debugging context-related failures, or optimizing context usage.
advanced-evaluation
Master LLM-as-a-Judge evaluation techniques including direct scoring, pairwise comparison, rubric generation, and bias mitigation. Use when building evaluation systems, comparing model outputs, or establishing quality standards for AI-generated content.
evaluation
Build evaluation frameworks for agent systems. Use when testing agent performance, validating context engineering choices, or measuring improvements over time.
context-optimization
Apply optimization techniques to extend effective context capacity. Use when context limits constrain agent performance, optimizing for cost or latency, implementing long-running agent systems, agents exhaust memory, or when designing conversation summarization strategies.
meta-convert-dev
Create language conversion skills for translating code from language A to language B. Use when building 'convert-X-Y' skills, designing type mappings between languages, establishing idiom translation patterns, or defining conversion methodologies. Provides foundational patterns that specific conversion skills extend.
meta-convert-guide
Guide for translating code between programming languages. Use when converting code from one language to another, planning language migrations, understanding conversion challenges, asking about type mappings, idiom translations, or referencing pattern mappings. Covers APTV workflow, type systems, error handling, concurrency, and language-specific gotchas.
Hook Development
This skill should be used when the user asks to "create a hook", "add a PreToolUse/PostToolUse/Stop hook", "validate tool use", "implement prompt-based hooks", "use ${CLAUDE_PLUGIN_ROOT}", "set up event-driven automation", "block dangerous commands", or mentions hook events (PreToolUse, PostToolUse, Stop, SubagentStop, SessionStart, SessionEnd, UserPromptSubmit, PreCompact, Notification). Provides comprehensive guidance for creating and implementing Claude Code plugin hooks with focus on advanced prompt-based hooks API.
Writing Hookify Rules
This skill should be used when the user asks to "create a hookify rule", "write a hook rule", "configure hookify", "add a hookify rule", or needs guidance on hookify rule syntax and patterns.
meta-library-dev
Develop reusable library code across languages. Use when designing public APIs, organizing modules, managing versioning, or creating utility libraries. Provides foundational patterns that language-specific *-lib-* skills extend.
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