Skill Claude CodeCodex
Review all prompts in a codebase for optimality, balancing effectiveness and token efficiency. Covers explicit prompt files, string-literal prompts, and dynamically constructed prompts in code. Use when the user asks to review, audit, or optimize prompts, system messages, LLM instructions, or agent prompts.
Skill Claude CodeCodex
Comprehensive code review methodology for evaluating code changes. Identifies bugs, logic errors, security issues, structural problems, performance concerns, and unintended behavior changes. Use when reviewing uncommitted changes, specific commits, branch comparisons, or pull requests.
Skill Claude CodeCodex
Guides the agent to write well-organized Go code and projects. Use when writing or reviewing Go code involving variable scoping, nested control flow, init functions, getters/setters, interfaces, generics, type embedding, functional options, package structure, utility packages, package naming, code documentation, or…
Skill Claude CodeCodex
Guides the agent to avoid foundational concurrency mistakes in Go: confusing concurrency with parallelism, assuming concurrency is always faster, misusing channels vs mutexes, ignoring data races and race conditions, mis-sizing worker pools for CPU- vs I/O-bound work, and misunderstanding Go contexts. Use when…
Skill Claude CodeCodex
Enforces practical Go concurrency rules from "100 Go Mistakes" (Ch.9, #61-#74) when writing or reviewing concurrent Go code. Use when code involves goroutines, channels, select statements, sync primitives (Mutex, WaitGroup, Cond, errgroup), or when passing contexts across goroutine boundaries. Catches context…
Skill Claude CodeCodex
Enforces correct usage of Go control structures including range loops, break statements, and defer in loops. Use when writing or reviewing Go code that iterates over slices, arrays, maps, or channels with range, uses break inside switch/select within loops, or places defer calls inside loops.
Skill Claude CodeCodex
Guides the agent to avoid common Go mistakes with basic data types, slices, and maps. Use when writing or reviewing Go code that involves integer literals, numeric overflow, floating-point arithmetic, slice initialization/slicing/appending/copying, map initialization, or value comparison. Covers mistakes #17-#29 from…
Skill Claude CodeCodex
Guides the agent to avoid common Go error management mistakes when writing or reviewing Go code. Covers panic usage, error wrapping vs transforming, checking error types and values correctly with errors.As/errors.Is, handling errors exactly once, explicitly ignoring errors, and handling defer errors. Use when writing…
Skill Claude CodeCodex
Enforces best practices for Go functions and methods including receiver type selection, named result parameters, nil receiver pitfalls, io.Reader over filenames, and defer argument evaluation. Use when writing, reviewing, or refactoring Go functions, methods, receivers, or defer statements.
Skill Claude CodeCodex
Guides the agent to write and review performance-sensitive Go code by applying CPU cache awareness, false sharing prevention, instruction-level parallelism, data alignment, escape analysis, allocation reduction, inlining, profiling, GC tuning, and Docker/Kubernetes GOMAXPROCS configuration. Use when writing hot-path…
Skill Claude CodeCodex
Guides the agent to avoid common Go standard library mistakes when writing or reviewing Go code. Covers time.Duration misuse, time.After memory leaks, JSON handling pitfalls (type embedding, monotonic clock, map of any), SQL mistakes (sql.Open, connection pooling, prepared statements, null values, row iteration…
Skill Claude CodeCodex
Guides the agent to write correct and efficient Go string code. Use when writing or reviewing Go code that iterates over strings, concatenates strings, trims strings, converts between string and []byte, or extracts substrings. Covers rune semantics, string iteration pitfalls, trim vs. suffix/prefix functions…
Skill Claude CodeCodex
Guides the agent to avoid common Go testing mistakes when writing or reviewing test code. Covers test categorization (build tags, env vars, short mode), race detection, test execution modes (parallel, shuffle), table-driven tests, avoiding sleeps in tests, handling the time API deterministically, using httptest/iotest…
Skill Claude CodeCodex
Detect discrepancies between project specifications and actual code. Use when you suspect specs have drifted from implementation, after a major refactoring, during onboarding to verify spec accuracy, or on explicit user request. For each discrepancy found, interactively asks the user whether to trust the code, trust…
Skill Claude CodeCodex
Proactively consult project specifications before making structural changes. Use BEFORE modifying layer boundaries, adding/removing interfaces, changing architectural patterns, adding new components to existing domains, or any change that could violate documented invariants. This skill navigates the spec system to…
Skill Claude CodeCodex
Create a new specification document following the project's spec system templates and conventions. Use when adding a new domain, component, contract, architecture doc, or Architecture Decision Record (ADR). Ensures correct format, naming, placement, cross-references, and INDEX.md update.
Skill Claude CodeCodex
Initialize a specification system for a project from scratch. Analyzes the codebase to identify architectural layers, domains, boundaries, and key decisions, then generates the initial set of specs (META.md, WORKFLOW.md, INDEX.md, domain specs, contracts, architecture docs, ADR template). Use when bootstrapping specs…
Skill Claude CodeCodex
Update existing specification documents after code changes that alter documented behavior, interfaces, or invariants. Use after implementation when you have changed behavior covered by a spec, added/removed/renamed interfaces in a contract, modified architectural boundaries, or changed configuration. Ensures format…
Skill Claude CodeCodex
Write secure Go applications through everyday development practices — no AppSec expertise required. Covers the 12 OWASP Top 10 categories (2021 & 2025) with idiomatic Go patterns, standard library defaults, recommended libraries, and a security-focused linter setup. Use when writing or reviewing Go backend code…
Skill Claude CodeCodex
Analyzes the project codebase, documentation, and memory to identify the single highest-priority task to work on right now. Triggers on phrases like "Hey, what are we going to do today, Brain?", "What should I work on?", "What's next?", or any request for task prioritization.
Skill Claude CodeCodex
Analyze hypothesis results and the current state of the hypothesis graph to recommend continue, pivot, kill, or fork decisions for an research iteration. Considers timebox constraints, budget, research question alignment, and graph topology. Use after an experiment completes, when the researcher needs help deciding…
Skill Claude CodeCodex
Guide experiment design, execution tracking, and result recording for an research hypothesis. Helps set up reproducible environments, plan minimal experiments, track progress against the timebox, and formally record outcomes. Use when starting an experiment for a hypothesis, setting up a test environment, tracking…
Skill Claude CodeCodex
Create, update, and manage hypothesis cards within an research project. Maintains the hypothesis graph (Mermaid diagram) and the catalog table. Handles parent-child relationships, status transitions, and result recording. Use when formulating a new hypothesis, recording experiment results, updating hypothesis status…
Skill Claude CodeCodex
Initialize a new research project following the Iterative Engineering Research Methodology. Creates the file catalog structure (brief, hypothesis graph, prior art page) and populates the research brief through structured dialogue with the researcher. Use when starting a new research, setting up a new investigation, or…