Claude skills and agent skills

JayRHaSkill

0-template

JayRHa/agent-skills/0-template/SKILL.md

Template for creating a new Agent Skill. Copy this folder, rename it to your skill's kebab-case name, and fill in every section. Use this as the starting point whenever you author a new skill for the AgentSkills library.

JayRHaSkill

ab-test-analyzer

JayRHa/agent-skills/ab-test-analyzer/SKILL.md

Designs and analyzes A/B tests end-to-end — frames a sharp hypothesis, computes required sample size and test duration, runs significance tests (two-proportion z-test, Welch's t-test, chi-square), reports confidence intervals and lift, and flags common pitfalls like peeking, multiple comparisons, and Simpson's paradox. Use this skill when the user mentions A/B testing, split testing, experiment design, conversion-rate experiments, statistical significance, p-values, sample size or power calculations, "did this experiment win", minimum detectable effect (MDE), or asks to interpret experiment results honestly. Includes a runnable stats script (scripts/abtest.py).

JayRHaSkill

adr-author

JayRHa/agent-skills/adr-author/SKILL.md

Authors Architecture Decision Records (ADRs) that capture context, considered options with trade-offs, the chosen decision, and its consequences. Use this skill when the user wants to write, draft, document, or revise an architecture decision, an ADR, a design decision record, a technical decision log, or asks "why did we choose X" / "we need to record this decision" / "document this trade-off" for things like database choice, framework selection, API style, build vs. buy, or deprecating a component.

JayRHaSkill

api-designer

JayRHa/agent-skills/api-designer/SKILL.md

Designs clean, consistent REST and GraphQL APIs covering resource modeling, URL structure, versioning, pagination, filtering, error formats (RFC 9457 Problem Details), idempotency, authentication, rate limiting, and machine-readable contracts (OpenAPI 3.1 / GraphQL SDL). Use this skill when designing a new API or endpoint, reviewing an API design, choosing REST vs GraphQL, deciding on versioning or pagination strategy, defining error responses, adding idempotency keys, writing or critiquing an OpenAPI/GraphQL schema, or establishing API style guidelines and naming conventions.

Often used withshopify-expert·monitoring-expert·rails-expert

JayRHaSkill

api-docs-writer

JayRHa/agent-skills/api-docs-writer/SKILL.md

Writes precise, complete reference documentation for HTTP/REST APIs and authors valid OpenAPI 3.1 specifications, including endpoint pages, request/response schemas, parameter tables, authentication, pagination, code samples, and error tables. Use this skill when the user asks to "document an API", "write API reference docs", "create an OpenAPI/Swagger spec", "document these endpoints", "write a REST API reference", "add request/response examples", "document error codes", "describe API parameters", or convert code/routes into API documentation.

JayRHaSkill

aws-cost-optimizer

JayRHa/agent-skills/aws-cost-optimizer/SKILL.md

Systematically reduces AWS cloud spend by right-sizing over-provisioned compute, finding and eliminating idle or orphaned resources, committing to Savings Plans and Reserved Instances, and enforcing cost-allocation tagging. Use this skill when the user asks to "reduce AWS bill", "optimize cloud costs", "find idle EC2/RDS/EBS", "right-size instances", "should I buy a Savings Plan or Reserved Instance", "set up cost allocation tags", "why is my AWS bill so high", or wants a structured FinOps cost-reduction plan.

JayRHaSkill

blog-post-writer

JayRHa/agent-skills/blog-post-writer/SKILL.md

Writes engaging technical blog posts with a strong hook, clear structure, concrete examples, and a memorable takeaway. Use this skill when the user asks to "write a blog post", "draft an article", "turn this into a blog post", "write up a tutorial", "explain X in a post", "create a dev.to / Medium / Hashnode article", or wants help with an engineering blog, technical write-up, announcement post, or developer-facing essay. Covers ideation, outlining, drafting, hooks, headlines, code examples, SEO basics, and editing for clarity.

JayRHaSkill

book-summarizer

JayRHa/agent-skills/book-summarizer/SKILL.md

Distills a book into a clear, faithful summary at the depth the reader wants — from a one-paragraph gist to chapter-by-chapter notes — surfacing the core thesis, key ideas, memorable examples, and actionable takeaways without distortion. Use this skill when a user asks to "summarize this book", "give me the key takeaways from X", "what's the main idea of X", "TL;DR of X", "chapter summary", or wants the actionable points or a book-club discussion guide.

JayRHaSkill

changelog-keeper

JayRHa/agent-skills/changelog-keeper/SKILL.md

Maintains a CHANGELOG.md in the Keep a Changelog format with Semantic Versioning, grouping user-facing entries under Added/Changed/Deprecated/Removed/Fixed/Security and cutting dated releases from an Unreleased section. Use this skill when the user asks to "update the changelog", "add a changelog entry", "cut a release", "bump the version", "what changed since the last release", or to create/clean up a CHANGELOG.md or release notes.

JayRHaSkill

chart-chooser

JayRHa/agent-skills/chart-chooser/SKILL.md

Selects the most appropriate chart type for a given dataset and analytical question, then produces a clean, honest, well-labeled visualization spec. Use this skill when a user asks "what chart should I use", "how should I visualize this data", "which graph fits", "make a chart for X", "is a pie chart right here", "how do I show change over time / comparison / distribution / correlation / part-to-whole", or when reviewing an existing chart for clarity and honesty. Covers chart-type decision-making, encoding choices (axis, color, size), labeling, axis-truncation ethics, accessibility, and avoiding misleading visuals.

JayRHaSkill

code-reviewer

JayRHa/agent-skills/code-reviewer/SKILL.md

Reviews a code diff or pull request for correctness bugs, security vulnerabilities, and quality/maintainability problems, producing severity-ranked findings with file/line references and concrete fix suggestions. Use this skill when the user asks to "review this PR", "review my diff", "code review", "look over these changes", "check this code before merge", "find bugs in this change", or pastes a diff/patch and wants feedback. Applies to git diffs, GitHub/GitLab PRs, staged changes, or a set of changed files in any language.

JayRHaSkill

competitive-analysis

JayRHa/agent-skills/competitive-analysis/SKILL.md

Analyzes competitors and market position through structured data collection, feature/pricing comparison matrices, SWOT, positioning maps, and actionable strategic recommendations. Use this skill when the user asks to "analyze competitors", "do a competitive analysis", "compare us against X and Y", "build a competitor matrix", "find our market positioning", "size up the competition", "create a battlecard", or evaluate market gaps and differentiation opportunities.

JayRHaSkill

concept-explainer

JayRHa/agent-skills/concept-explainer/SKILL.md

Explains complex or technical concepts clearly at the right level for the audience, using layered depth, concrete analogies, worked examples, and checks for understanding — adapting from ELI5 to expert. Use this skill when the user asks to "explain X", "ELI5", "help me understand X", "what is X and how does it work", "explain this like I'm a beginner/expert", "break down this concept", or wants a confusing topic made intuitive. Works for technical, scientific, financial, or abstract topics.

JayRHaSkill

cover-letter-writer

JayRHa/agent-skills/cover-letter-writer/SKILL.md

Writes tailored, persuasive cover letters that connect a candidate's concrete achievements to a specific role and company — with a strong hook, evidence-backed body, and clear close. Use this skill when a user asks to "write a cover letter", "write a motivation letter", "cover letter for this job", "letter of interest", or wants help explaining a career change, employment gap, or why they want a particular role.

JayRHaSkill

cron-scheduler

JayRHa/agent-skills/cron-scheduler/SKILL.md

Builds, validates, explains, and previews cron expressions across Vixie/POSIX cron, systemd timers, and cloud schedulers, with explicit handling of timezones, DST, the day-of-month/day-of-week OR-logic trap, and overlap/missed-run pitfalls. Use this skill when the user asks to "write a cron job", "what does this cron expression mean", "schedule something every X", "explain `*/15 9-17 * * 1-5`", debug a cron that fires at the wrong time, convert a human schedule to cron, or reason about cron timezones, DST, and overlapping runs.

JayRHaSkill

data-pipeline-architect

JayRHa/agent-skills/data-pipeline-architect/SKILL.md

Designs robust ETL/ELT data pipelines covering ingestion, idempotency, schema evolution, orchestration, and data quality validation. Use this skill when the user asks to design, build, or review a data pipeline, ingest data from APIs/databases/files into a warehouse or lake, set up batch or streaming ETL/ELT, choose an orchestrator (Airflow, Dagster, Prefect, dbt), make a pipeline idempotent or backfill-safe, handle late-arriving or duplicate data, manage schema drift/evolution, add data quality or freshness checks, or model incremental/CDC loads.

JayRHaSkill

debug-detective

JayRHa/agent-skills/debug-detective/SKILL.md

Systematically root-causes software bugs using a reproduce → isolate → hypothesize → bisect → verify methodology, replacing guess-and-check debugging with a disciplined, evidence-driven investigation. Use this skill when a user reports a bug, a test is failing intermittently or consistently, behavior differs between environments, a regression appeared after a change, something "used to work" and now doesn't, an error/stack trace needs root-causing, or when asked to "debug", "find the root cause", "figure out why X happens", or "track down" a defect. Triggers include crashes, wrong output, flaky tests, hangs/deadlocks, memory leaks, performance regressions, heisenbugs, and works-on-my-machine problems.

JayRHaSkill

decision-matrix

JayRHa/agent-skills/decision-matrix/SKILL.md

Builds a weighted decision matrix to compare options against criteria with transparent, reproducible scoring and sensitivity analysis. Use this skill when the user needs to choose between multiple options, compare alternatives, "help me decide", "which should I pick", weigh trade-offs, evaluate vendors/tools/candidates/houses/job offers, run a pros-and-cons or scoring analysis, rank choices objectively, or justify a recommendation with numbers. Triggers include "decision matrix", "weighted scoring", "compare these options", "pugh matrix", "trade study", and "how do I choose between X and Y".

JayRHaSkill

dependency-upgrader

JayRHa/agent-skills/dependency-upgrader/SKILL.md

Safely upgrades project dependencies by inventorying outdated packages, reading changelogs and migration guides, staging upgrades in isolated commits, running tests at each step, and rolling back cleanly on failure. Use this skill when asked to "upgrade dependencies", "bump packages", "update npm/pip/cargo/go modules", "resolve a CVE / security advisory", "migrate to the latest version of <library>", "fix outdated dependencies", "do a dependency bump PR", or when a Dependabot/Renovate PR needs review and verification.

JayRHaSkill

email-composer

JayRHa/agent-skills/email-composer/SKILL.md

Drafts clear, professional emails with the right tone, structure, and a concrete call to action by clarifying audience, purpose, and desired outcome. Use this skill when the user asks to "write an email", "draft an email", "compose a message", "reply to this email", "make this email sound more professional/polite/firmer", "follow up", "send a cold outreach", "decline/apologize/ask for something by email", or needs help with subject lines, tone, or email structure.