Name: research
Author: liohtml

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Ultimate Skills

One opinionated, deduplicated marketplace of the best Claude Code skills — distilled from five community skill repos (109 skills → 39 keepers) and regrouped into four discipline plugins: engineering · product · design · research.

This is a curation, not original work. Every skill keeps its original author and license — see NOTICE.md and PROVENANCE.csv. It was assembled by a small team of specialist reviewers (engineer, product/marketing, UX, repo expert) with a devil's-advocate pass to cut redundancy.

What's inside

Plugin

Skills

License

Focus

engineering

MIT

Spec → plan → build → test → debug → review → harden → ship

product

MIT

Discovery, strategy, prioritization, PRDs, pricing, metrics

design

MIT

Anti-slop frontend taste, image-to-code, redesign, UI engineering

research

CC-BY-NC-4.0

Deep research, academic writing, peer review

⚠️ Mixed licensing. engineering, product, and design are MIT (commercial use OK). research is CC-BY-NC-4.0 — non-commercial only, isolated in its own plugin so it can be dropped cleanly. See NOTICE.md.

Install

# Add this marketplace (from GitHub) /plugin marketplace add Liohtml/ultimate-skills # …or from a local clone /plugin marketplace add /path/to/ultimate-skills # Then install the plugins you want /plugin install engineering@ultimate-skills /plugin install product@ultimate-skills /plugin install design@ultimate-skills /plugin install research@ultimate-skills # CC-BY-NC — non-commercial

Each skill activates automatically when its trigger matches your task; you can also name it explicitly (e.g. "use the strategy-red-team skill on this PRD").

Skill catalog

engineering (MIT)

Skill

What it does

spec-driven-development

Write a spec before coding when requirements are unclear or work is significant.

planning-and-task-breakdown

Break a spec into ordered, independently verifiable tasks.

incremental-implementation

Ship multi-file changes as small, safe vertical slices.

test-driven-development

Drive logic and bug-fixes with tests; prove code works.

debugging-and-error-recovery

Systematic root-cause debugging when things break.

code-review-and-quality

Multi-axis review with severity labels before merge.

code-simplification

Refactor for clarity without changing behavior.

security-and-hardening

Harden input handling, auth, storage, and integrations (incl. LLM).

performance-optimization

Measure-first optimization, budgets, Core Web Vitals.

api-and-interface-design

Stable, contract-first API and module-boundary design.

git-workflow-and-versioning

Commits, branching, conflicts, bisect-driven debugging.

ci-cd-and-automation

Quality-gated build/deploy pipelines and rollout/rollback.

doubt-driven-development

In-flight fresh-context adversarial review of key decisions.

documentation-and-adrs

ADRs, READMEs, and changelogs that record context.

browser-testing-with-devtools

Verify behavior in a real browser via Chrome DevTools MCP.

karpathy-guidelines

Lightweight behavioral rules to avoid common LLM-coding mistakes.

product (MIT)

Skill

What it does

strategy-red-team

Steelman then attack a PRD/roadmap's load-bearing assumptions.

opportunity-solution-tree

Torres-style discovery: outcome → opportunities → solutions → experiments.

prioritization-frameworks

9 frameworks (RICE, ICE, Kano, MoSCoW…) with formulas and when-to-use.

pre-mortem

Imagine the launch failed; triage Tigers / Paper Tigers / Elephants.

create-prd

8-section Product Requirements Document.

pricing-strategy

Pricing models, value metric, Van Westendorp, experiments.

ab-test-analysis

Significance, sample size, SRM, guardrails → ship/extend/stop.

north-star-metric

Define the NSM + input-metric constellation by business game.

value-proposition

6-part JTBD value-proposition design.

competitor-analysis

Research-driven competitive landscape and differentiation.

interview-script

Mom-Test / JTBD customer-discovery interview script.

user-personas

Research-grounded personas with JTBD, pains, gains.

intended-vs-implemented

Audit the gap between intended behavior and shipped code.

Ultimate Skills

What's inside

Plugin	Skills	License	Focus
`engineering`	16	MIT	Spec → plan → build → test → debug → review → harden → ship
`product`	13	MIT	Discovery, strategy, prioritization, PRDs, pricing, metrics
`design`	6	MIT	Anti-slop frontend taste, image-to-code, redesign, UI engineering
`research`	4	CC-BY-NC-4.0	Deep research, academic writing, peer review

⚠️ Mixed licensing. engineering, product, and design are MIT (commercial use OK). research is CC-BY-NC-4.0 — non-commercial only, isolated in its own plugin so it can be dropped cleanly. See NOTICE.md.

Install

# Add this marketplace (from GitHub)
/plugin marketplace add Liohtml/ultimate-skills

# …or from a local clone
/plugin marketplace add /path/to/ultimate-skills

# Then install the plugins you want
/plugin install engineering@ultimate-skills
/plugin install product@ultimate-skills
/plugin install design@ultimate-skills
/plugin install research@ultimate-skills   # CC-BY-NC — non-commercial

Each skill activates automatically when its trigger matches your task; you can also name it explicitly (e.g. "use the strategy-red-team skill on this PRD").

Skill catalog

engineering (MIT)

Skill	What it does
`spec-driven-development`	Write a spec before coding when requirements are unclear or work is significant.
`planning-and-task-breakdown`	Break a spec into ordered, independently verifiable tasks.
`incremental-implementation`	Ship multi-file changes as small, safe vertical slices.
`test-driven-development`	Drive logic and bug-fixes with tests; prove code works.
`debugging-and-error-recovery`	Systematic root-cause debugging when things break.
`code-review-and-quality`	Multi-axis review with severity labels before merge.
`code-simplification`	Refactor for clarity without changing behavior.
`security-and-hardening`	Harden input handling, auth, storage, and integrations (incl. LLM).
`performance-optimization`	Measure-first optimization, budgets, Core Web Vitals.
`api-and-interface-design`	Stable, contract-first API and module-boundary design.
`git-workflow-and-versioning`	Commits, branching, conflicts, bisect-driven debugging.
`ci-cd-and-automation`	Quality-gated build/deploy pipelines and rollout/rollback.
`doubt-driven-development`	In-flight fresh-context adversarial review of key decisions.
`documentation-and-adrs`	ADRs, READMEs, and changelogs that record context.
`browser-testing-with-devtools`	Verify behavior in a real browser via Chrome DevTools MCP.
`karpathy-guidelines`	Lightweight behavioral rules to avoid common LLM-coding mistakes.

product (MIT)

Skill	What it does
`strategy-red-team`	Steelman then attack a PRD/roadmap's load-bearing assumptions.
`opportunity-solution-tree`	Torres-style discovery: outcome → opportunities → solutions → experiments.
`prioritization-frameworks`	9 frameworks (RICE, ICE, Kano, MoSCoW…) with formulas and when-to-use.
`pre-mortem`	Imagine the launch failed; triage Tigers / Paper Tigers / Elephants.
`create-prd`	8-section Product Requirements Document.
`pricing-strategy`	Pricing models, value metric, Van Westendorp, experiments.
`ab-test-analysis`	Significance, sample size, SRM, guardrails → ship/extend/stop.
`north-star-metric`	Define the NSM + input-metric constellation by business game.
`value-proposition`	6-part JTBD value-proposition design.
`competitor-analysis`	Research-driven competitive landscape and differentiation.
`interview-script`	Mom-Test / JTBD customer-discovery interview script.
`user-personas`	Research-grounded personas with JTBD, pains, gains.
`intended-vs-implemented`	Audit the gap between intended behavior and shipped code.

research

Popularity

What's Inside

Confidence

README

Ultimate Skills

What's inside

Install

Skill catalog

engineering (MIT)

product (MIT)

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Ultimate Skills

What's inside

Install

Skill catalog

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More by Liohtml

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Popularity

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