Skill Claude CodeCodex
Standard Python engineering stack and tooling conventions. Use this skill whenever starting a new Python project, setting up dependencies, configuring linting/testing/CI, choosing between frameworks or libraries, or when the user asks about Python project structure, tooling choices, or best practices. Also trigger…
Skill Claude CodeCodex
Comprehensive Rust engineering guidance for coding agents. Use when writing, reviewing, refactoring, or debugging Rust code; designing crate APIs; resolving ownership, borrowing, lifetime, or trait issues; implementing async/concurrent code with Tokio; improving error handling, testing, performance, memory layout, or…
Skill Claude CodeCodex
Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, update or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy.
Agent
Analyze blind comparison results to understand WHY the winner won and generate improvement suggestions.
Agent
Compare two outputs WITHOUT knowing which skill produced them.
Agent
Evaluate expectations against an execution transcript and outputs.
Skill Claude CodeCodex
Follow Kent Beck's "Tidy First" approach by strictly separating structural changes (renames, extractions, reorganizations that must not change behavior) from behavioral changes (features, bug fixes, logic changes). Use when refactoring, restructuring code, renaming variables/functions, extracting methods, separating…
Skill Claude CodeCodex
Comprehensive TypeScript engineering guidance for coding agents. Use when writing, reviewing, refactoring, or debugging TypeScript or TSX code; designing public APIs; fixing tsconfig or strict-mode issues; resolving generic, union, narrowing, async, module, or type-inference problems; improving runtime validation…
Skill Claude CodeCodex
Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to: open, read, edit, or fix an existing .xlsx, .xlsm, .csv, or .tsv file (e.g., adding columns, computing formulas, formatting, charting, cleaning messy data); create a new spreadsheet from scratch or…