Hex Research

Claude-Codex Skills

Open-source standalone agent skills, distributed as plugins for Claude Code and OpenAI Codex, help turn product ideas, code fixes, architecture reviews and deployments into scoped work with a verifiable result. Each workflow defines what to check, what it may change, and how to report evidence and remaining gaps.

Project page · Install · Full catalog

Choose a route

Choose by the result you need. Each skill works independently.

Your task	Plugin	Result
Is this idea worth building?	product-discovery-suite	Opportunity assessment, requirements, or interaction design.
How should this system change?	architecture-suite	System map, design decision, or migration plan.
Is this plan ready to implement?	delivery-planning-suite	Reviewed plan, ordered work, and test strategy.
Fix, upgrade, simplify, or speed up this code.	implementation-suite	Scoped change with behavior and benefit checks.
What could go wrong with this delivery or codebase?	quality-assurance-suite	Evidence-backed findings or scoped acceptance tests.
Get this change published or deployed.	delivery-suite	Authorized publication or deployment, verified at its destination.
Why did this fail, or did the feature help?	operations-suite	Incident diagnosis or product outcome assessment.
Can I trust the instructions in this skill?	skill-maintenance-suite	Skill boundaries, consistency, and distribution review.
Prepare Docker containers, configuration, access control or recovery.	engineering-foundation-suite	Native technical contracts and verified changes.

Install

For a feature or fix, start with implementation-suite. Replace it with another plugin from Choose a route for a different task.

Claude Code:

/plugin marketplace add levnikolaevich/claude-code-skills
/plugin install implementation-suite@levnikolaevich-skills-marketplace
/reload-plugins

Codex:

codex plugin marketplace add levnikolaevich/claude-code-skills
codex plugin add implementation-suite@levnikolaevich-skills-marketplace

Invoke a skill by its full name: /implementation-suite:ln-41-surgical-change-implementer in Claude Code or $ln-41-surgical-change-implementer in Codex, followed by your task. For example: “Fix the total calculation when an item has a discount. Preserve the current rounding rules.”

For personal defaults shared by Claude Code and Codex, use the optional user instructions template and connection guide. Personalize and merge it into your existing configuration; plugin installation does not change global instructions.

Lifecycle and plugins

Product Discovery Suite

Decide what is worth building, who it serves, and what a useful first version must do.

Index	Skill	Purpose
11	Opportunity Evaluator	Evaluates new product opportunities through demand, channels and economics before committing to build.
12	Product Requirements Builder	Defines product requirements, business rules and acceptance criteria for a committed intent; edits product docs only.
13	Interaction Design Builder	Designs user flows, interaction states and mockups for a defined product scope; does not implement UI code.

Architecture Suite

Understand the system you have and choose changes with clear boundaries, tradeoffs, and recovery paths.

Index	Skill	Purpose
21	System Design Baseline Builder	Defines measurable architecture drivers and constraints before system design; edits architecture docs only.
22	Current Architecture Documenter	Documents current architecture from implementation evidence; does not propose a target or audit fitness.
23	System Design Proposal Builder	Designs target system boundaries, contracts and tradeoffs from requirements; does not plan tasks or implement.
24	Architecture Decision Recorder	Records one architecture decision with alternatives, consequences and status; does not design the whole system.
25	Architecture Diagram Builder	Creates evidence-backed current or target architecture diagrams; not UI design.
26	Architecture Migration Planner	Plans architecture migrations with compatibility, data safety, rollout and recovery; does not execute them.

Delivery Planning Suite

Find missing decisions and risky dependencies before they become implementation rework.

Index	Skill	Purpose
31	Delivery Plan Builder	Builds dependency-ordered delivery plans from requirements and repository evidence; read-only.
32	Test Strategy Planner	Plans risk-based test portfolios and acceptance evidence; does not write or execute tests.
33	Plan Reviewer	Reviews a concrete implementation plan for missing decisions, feasibility and risk before execution; read-only.

Implementation Suite

Fix the cause, reuse what already works, and keep changes focused on a verified outcome.

Index	Skill	Purpose
41	Surgical Change Implementer	Implements one scoped product feature or fix using existing contracts; not upgrades, performance tuning or establishing cross-cutting technical foundations.
42	Dependency Upgrader	Upgrades dependencies in reversible batches with version-specific compatibility and regression checks.
43	Code Modernizer	Modernizes a bounded capability to reduce demonstrated maintenance cost; not routine upgrades or performance tuning.
44	Performance Optimizer	Profiles and improves a measured performance bottleneck; retains only verified improvements.
45	Benchmark Comparator	Compares tools or implementations through controlled benchmarks and independent correctness checks.

Quality Assurance Suite

Find gaps that could break a release, mislead a maintainer, or make a passing test meaningless.

Index	Skill	Purpose
51	Acceptance Test Builder	Builds, updates or retires scoped acceptance tests and verifies execution; does not repair product code.
52	Delivery Reviewer	Reviews a completed change for acceptance, regressions and release risk; read-only, not a whole-codebase audit.
53	Documentation Auditor	Audits documentation and comments for trust, coverage, consistency and freshness; read-only.
54	Codebase Auditor	Audits cross-cutting codebase health, security and maintainability; not a single-change review or specialist audit.
55	Test Suite Auditor	Audits existing tests for risk coverage, reliable oracles and maintenance value; does not edit tests.
56	Architecture Auditor	Audits implemented architecture boundaries, dependencies and ownership; not target design or plan review.
57	Persistence Auditor	Audits queries, transactions, consistency and persistence resource lifetimes; read-only.

Delivery Suite

Publish the intended changes and verify what reached the remote repository or target environment.

Index	Skill	Purpose
61	Repository Publisher	Commits, pushes and remotely verifies authorized repository changes; does not create releases.
62	Release Publisher	Prepares and publishes an explicitly requested tagged GitHub release; does not deploy applications.
63	Deployment Engineer	Prepares CI/CD and remote infrastructure, then executes authorized rollouts with health and recovery checks; not standalone local container packaging.
64	Community Announcer	Drafts or publishes authorized, fact-checked GitHub Discussions announcements; does not create releases.

Operations Suite

Turn incidents and product signals into evidence for the next recovery or product decision.

Index	Skill	Purpose
71	Operations Investigator	Diagnoses incidents from operational evidence and proposes recovery; does not change live systems.
72	Product Outcome Evaluator	Evaluates observed product outcomes against a prior hypothesis; does not run experiments or change user treatment.

Skill Maintenance Suite

Make skills easier to invoke correctly, follow consistently, and verify before distribution.

Index	Skill	Purpose
81	Skill Reviewer	Reviews skill instructions, trigger boundaries and distribution contracts; not product code.

Engineering Foundation Suite

Establish and verify project technical foundations using native stack mechanisms, explicit contracts and safe recovery.

Index	Skill	Purpose
91	Engineering Baseline Builder	Creates project technical rules and recurring local procedures from the actual stack; edits guidance only, not architecture targets or application code.
92	Container Engineer	Builds, hardens or reviews container images and local runtime packaging with startup and shutdown evidence; not remote deployment or host administration.
93	Configuration Engineer	Establishes configuration ownership, validation, secret boundaries and environment isolation; not credential identity policy or live deployment.
94	Authentication Engineer	Implements or repairs identity verification and session or credential lifecycle; not operation permissions, resource access policy or a new identity provider by default.
95	Resource Authorization Engineer	Implements permissions and tenant or owner scoped resource access while preserving approved grants; not authentication or role redesign.
96	Error Handling Engineer	Implements safe error boundaries, cancellation and user recovery contracts; not telemetry pipelines or durable retry machinery.
97	Observability Engineer	Implements structured diagnostics, correlation and justified metrics or traces; not incident investigation or a mandatory telemetry platform.
98	Mutation Reliability Engineer	Implements transactions, idempotency and interrupted-operation recovery; not schema migration or a mandatory background-job platform.
99	Database Lifecycle Engineer	Prepares and verifies schema migrations, database roles and isolated recovery or test resources; not query tuning or runtime mutation orchestration.

Update an installed plugin

For a Git-backed marketplace, refresh the catalog, then update your plugin:

claude plugin marketplace update levnikolaevich-skills-marketplace
claude plugin update implementation-suite@levnikolaevich-skills-marketplace

codex plugin marketplace upgrade levnikolaevich-skills-marketplace
codex plugin add implementation-suite@levnikolaevich-skills-marketplace

For a local-directory marketplace, update its checkout first, then refresh the installed plugin; Codex marketplace upgrade supports Git sources only. Follow Claude's reload/restart instruction and start a new Codex session. Source edits alone do not refresh the installed cache or an existing session.

License

MIT