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Use SciPy's sparse matrix library for creating, manipulating, and operating on sparse matrices. Use when working with sparse data structures, converting formats, and applying sparse linear algebra.

Read, write, and manipulate STEP (ISO 10303) CAD files using Python. Use for importing/exporting 3D models, extracting geometry data, and converting between CAD formats. Works with OCP, pythonocc, and cadquery.

Exploit padding oracle vulnerabilities in CBC mode encryption. Use this skill when attacking web applications or services that leak information about PKCS7 padding validity.

Apply Open Source Intelligence gathering techniques for reconnaissance. Use this skill when collecting publicly available information about targets, searching public databases, or aggregating intelligence from multiple open sources.

Analyze ChIP-seq data for transcription factor binding and histone modification mapping.

Developer for Claude Orchestrator. Implements tasks according to Tech Lead instructions, applies design tokens, and reports completion. Use when asked to implement code or execute development tasks for the orchestrator.

Map logical to physical qubits for hardware connectivity. Use when handling SWAP routing, layout optimization, or adapting to topologies (linear, grid, heavy-hex).

Apply social engineering reconnaissance techniques to gather target information. Use this skill when profiling individuals, identifying organizational structure, or preparing for engagement scenarios.

Parse and analyze COBOL source code structure, data divisions, and procedure logic. Use when migrating COBOL applications, analyzing legacy mainframe code, or extracting business rules from COBOL programs.

Apply smoothing algorithms to reduce mesh noise and improve surface quality. Use for post-processing scanned data, organic modeling, and artifact removal. Supports Laplacian, Taubin, and bilateral filtering.

Apply cryptanalysis techniques to break ciphers without knowing the key. Use this skill when performing known-plaintext attacks, chosen-plaintext attacks, or statistical analysis to recover encryption keys.

Analyze port scan results to identify services, vulnerabilities, and attack vectors. Use this skill when interpreting scan data, prioritizing targets, or mapping network services.

Enter planning mode to research and analyze before implementation. Use when user wants to plan a feature, evaluate a technical approach, explore architectural decisions, or think through implementation before coding. Triggers on "plan", "think through", "analyze", "evaluate approach", "design decision", "before we implement", "let's research", or when proposing significant changes.

Enumerate subdomains, DNS records, and related domains. Use this skill when mapping an organization's internet presence, discovering hidden subdomains, or analyzing DNS infrastructure.

Apply effective software quality consultancy practices. Use when consulting, advising clients, or establishing consultancy workflows.

Apply context-driven testing principles where practices are chosen based on project context, not universal 'best practices'. Use when making testing decisions, questioning dogma, or adapting approaches to specific project needs.

Executing SQL, managing Snowflake objects, deploying applications, and orchestrating data pipelines using the Snowflake CLI (snow) command. Use this skill when you need to run SQL scripts, deploy Streamlit apps, execute Snowpark procedures, manage stages, automate Snowflake operations from CI/CD pipelines, or work with variables and templating.

Apply London (mock-based) and Chicago (state-based) TDD schools. Use when practicing test-driven development or choosing testing style for your context.

Apply safe refactoring patterns to improve code structure without changing behavior. Use when cleaning up code, reducing technical debt, or improving maintainability.

Design Apple-style iOS/macOS interfaces following Human Interface Guidelines. Creates HIG-compliant components with SF Symbols, San Francisco typography, and proper accessibility. Supports optional modern effects. Use when designing Apple-style UI, iOS/macOS interfaces, HIG-compliant components, or implementing design system specifications.