Index curated reference corpora into a searchable knowledge graph via the cognee engine, then query it to ground technical writing, review, and analysis. Use when ingesting reference documents into named datasets or retrieving grounding context for tasks like drafting or reviewing a manuscript. A reference-knowledge index, explicitly not agent session memory.
Nix development conventions for flakes, derivations, modules, and code style. Use when authoring flake.nix files, writing derivations or builders, designing NixOS/nix-darwin/home-manager modules, or following nix formatting and naming conventions. For check architecture and CI integration, see preferences-nix-checks-architecture and preferences-nix-ci-cd-integration.
Approximately-verifiable, refinement-driven development for type-driven domain-driven design. Use when modeling a domain as a dependently-typed Lean 4 specification, refining/lowering it to a Rust implementation, lifting the implementation back via Charon and Aeneas to check spec<->implementation correspondence (translation validation) — mechanically when tractable, otherwise via differential testing or LLM comparison — or when generating and diffing type-system diagrams of the model and implementation to track their evolution. Mechanical on-the-nose proof is the precise ideal, not a requirement; its absence is not a failure of the method.
Guide for creating effective skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Claude's capabilities with specialized knowledge, workflows, or tool integrations.
Algebraic data type patterns including sum types, product types, and pattern matching across languages. Load when designing type hierarchies or working with discriminated unions.
Algebraic laws including functor/monad laws and property-based testing strategies. Load when verifying algebraic properties or writing property tests.
Architectural patterns including hexagonal architecture, CQRS, and event-driven design. Load when making architectural decisions or reviewing system design.
Bounded context design including context mapping, integration patterns, and anti-corruption layers. Load when designing service boundaries or system integration.