Skill directory
Agent skills
Focused instruction packs that teach a coding agent one job well. Browse the catalog and use any of them inside a RiverX project.
1,243Skills
154Publishers
203Official
Expo Web To Nativeexpo/skillsOfficialFramework (OSS). Migrate an existing web React app to a native iOS/Android app with Expo. Use when the user wants to turn a website into a mobile app, port a Next.js/Vite/CRA React codebase to React Native, reuse web code on native incrementally, or asks how web idioms (the DOM, CSS, React Router, localStorage, window) map to native. This is the end-to-end migration guide; use the `expo-dom` skill for the DOM-component mechanism itself.2156Upstash Ratelimit JSupstash/skillsOfficialRate limiting for serverless and edge apps with the @upstash/ratelimit TypeScript/JavaScript SDK backed by Upstash Redis. Use when adding a rate limiter or throttling to an API route, Next.js middleware, Vercel Edge, Cloudflare Workers, or any HTTP endpoint; returning 429 Too Many Requests; choosing between fixed window, sliding window, and token bucket algorithms; limiting per user, IP, API key, or tenant with prefixes and custom keys; protecting login, signup, form, or AI endpoints from abuse, bots, and brute force; using deny lists, ephemeral caching, analytics, timeouts, and multi-region rate limits; or estimating the Redis command cost of rate limiting. Also use when the user says rate limit, rate-limiting, throttle, quota, request limits, or traffic protection.2146SEO Georesciencelab/opc-skills|21318Upstash Redis JSupstash/skillsOfficialWork with the @upstash/redis TypeScript/JavaScript SDK, a serverless HTTP-based Redis client for Next.js, Vercel, Cloudflare Workers, edge runtimes, and Node.js. Use when adding a cache (cache-aside, write-through, TTL and expiration strategies), session storage and user sessions, a key-value store, leaderboards and rankings with sorted sets, counters, distributed locks, queues with lists, streams and consumer groups, JSON documents, pipelines and MULTI/EXEC transactions, Lua scripting, read replicas, or full-text search, typo-tolerant search, facets, and aggregations with Upstash Redis Search (different from regular FT.SEARCH; also available for TCP clients via @upstash/search-redis and @upstash/search-ioredis). Also use when migrating from ioredis or node-redis, when a Redis connection is needed from a serverless function without connection pooling, when integrating @upstash/ratelimit, or when the user says Redis cache, KV store, session store, serverless Redis, or Upstash Redis. Supports automatic serialization/deserialization of JavaScript types.21330Writing Design Docsriekelt/technical-writerUse when writing a proposal, RFC, design document, spec, or migration plan - anything that argues for a change, records a design, or asks readers for input on one. Encodes the proposal skeleton, the Why & What decision box, and the completeness checks. Use whenever a change needs arguing or scoping in writing, even if the user just says "write up the approach".2111Writing Unit Testsriekelt/principal-engineerUse when writing or refactoring unit tests - a new test file, added cases, a flaky test, an unreadable one. Encodes behavior-first testing: one behavior per test, names that state the claim, deterministic setup, mocks only at boundaries you do not own. Use whenever a test is being written, even a quick one, and whenever a test needs a sleep, a mock of your own code, or a copy of the implementation's math.2091Grounding Before Codingriekelt/principal-engineerUse when starting any non-trivial change, investigating a bug, or working in unfamiliar code - before the first line is written. Also use for pure investigation with no change planned yet - \"dig into this\", \"figure out why\", \"sometimes the export is empty\", intermittent errors after a deploy. Encodes the ground-first discipline: map the real code and data, quote evidence, never guess conventions. Use whenever a change or a conclusion is about to be built from belief instead of from the tree, even under time pressure.2081Principal Engineeringriekelt/principal-engineerUse when doing any non-trivial engineering work - implementing, debugging, refactoring, configuring, operating, or investigating why a system misbehaves - or any change where being wrong has a cost. Encodes the evidence-over-theory discipline, the hard safety rules, and the pre-change checkpoint. Use whenever code, data, or infrastructure is about to change or must be understood before it can, even if the task looks routine or is only "find out why". Foundation for the sibling skills.2081Adding Dependenciesriekelt/principal-engineerUse when about to add, update, vet, or remove a dependency - a package, library, SDK, GitHub action, base image, or vendored code - or when a project's dependency posture needs declaring. Encodes the exhaust-what-you-have ladder, the vetting questions, and pin-and-prove updating. Use even for a tiny utility package: that is exactly how the tree grows.2071Guarding Architectureriekelt/principal-engineerUse when a change crosses module boundaries, adds a dependency direction between modules, touches a critical path, or conflicts with a stated principle - and when writing or updating architecture principles themselves. Encodes structural invariants as named, enforced contracts: statement, rationale, guard. Use whenever \"we'll just import it from there for now\" appears, which is how boundaries die.2071Handling Failuresriekelt/principal-engineerUse when writing or touching any error path, catch block, fallback, default value, retry, or degraded mode - in any language, any repo. Encodes the no-silent-swallows contract and the fail-loud discipline. Use whenever an exception is about to be caught, a null is about to get a default, or a failure could pass unnoticed, even if the goal is "just make it not crash".2071Keeping One Source Of Truthriekelt/principal-engineerUse when adding data, config, state, constants, an enum-like string, a cache, or anything that could exist in two places - or when two sources already disagree. Encodes the one-fact-one-source doctrine for code and data: derive rather than store, extend the owner, absorb duplicates. Use at the moment copying a value feels faster than referencing it.2071Open Knowledge Discoveryinkeep/open-knowledge-skillsRead when the user asks what OpenKnowledge is, wants to install it on a repository, wants to open or preview a single markdown file that is not part of an OpenKnowledge project, wants to share an OpenKnowledge project with collaborators, asks whether OpenKnowledge supports a particular capability, or asks how `ok init` / `ok cowork` / OK Desktop set up a project. Do NOT load to perform OpenKnowledge reads/writes — the runtime guidance for editing markdown inside an initialized OK project ships as a separate project-local skill installed into each detected agent's skills dir (for example `.claude/skills/open-knowledge/`) whenever `ok init` runs.2071Operating Safelyriekelt/principal-engineerUse when an action touches live systems, shared state, or things that do not come back - deleting, overwriting, restarting, killing processes, editing shared config, handling secrets, or working beside concurrent sessions. Encodes the destructive-op guards, secrets hygiene, and concurrent-session safety. Use before the destructive command, not after, even when the command looks routine.2071Reviewing Technical Proseriekelt/technical-writerUse when reviewing, rewriting, or editing someone else's technical text, when writing a review report on a document, or as the final check before delivering any document. Encodes the severity mapping, the findings format, the what-not-to-flag list, and the delivery checklist. Use before any document ships, even when it looks fine.2071Scoping Changesriekelt/principal-engineerUse when deciding how big a fix should be, when scope is drifting mid-task, when a plan is being quietly trimmed to fit, or when "while you're at it" appears in any form. Encodes size-to-trigger, decompose-not-descope, and drive-to-completion. Use whenever the work is about to grow past its cause or shrink below its promise.2071Testing Changesriekelt/principal-engineerUse when deciding what tests a change needs - a feature, a bug fix, a refactor, any behavior change - or when reviewing whether a diff's tests are sufficient. Encodes tests-change-with-behavior, the bug-regression pattern, and assertion discrimination. Use whenever behavior changes and the test diff is empty, especially when the change is "too small to test".2071Verifying Before Doneriekelt/principal-engineerUse when about to say \"done\", \"fixed\", \"passing\", or \"shipped\", or when reporting the outcome of any change. Encodes verification as the definition of done: drive the change at its surface, run the verify command, report faithfully, distrust green suites, own failing gates. Use before every completion claim, even when the change was small and obviously correct, which is when this is skipped.2071Writing Changelogsriekelt/technical-writerUse when writing a changelog entry, release notes, or a "what shipped" summary after completing work. Encodes the entry shape, the handover template, and the honesty conventions. Use after shipping meaningful work, even if the user just says "summarize what we did".2071Nature Sharedyuan1z0825/nature-skillsInternal shared-reference support package for installed Nature Skills, including nature-writing, nature-polishing, nature-response, nature-reader, and nature-paper2ppt. Do not invoke it as a standalone user workflow. Load only the specific core or journal-format file requested by another Nature skill.20621SEOaddyosmani/web-quality-skillsOptimize for search engine visibility and ranking. Use when asked to "improve SEO", "optimize for search", "fix meta tags", "add structured data", "sitemap optimization", or "search engine optimization".2052Slack Gif Creatoranthropics/skillsOfficialKnowledge and utilities for creating animated GIFs optimized for Slack. Provides constraints, validation tools, and animation concepts. Use when users request animated GIFs for Slack like "make me a GIF of X doing Y for Slack.2057Multi Agent Reviewriekelt/multi-agent-reviewUse when a spec or plan needs review before execution begins - "review my spec", "is this plan ready to execute", "check this before I build it", "second opinion on this plan" - and specifically before writing-plans (spec mode) or before subagent-driven-development (plan mode). Reviews specs and plans, not code. Panels six reviewers across two model tiers and three topics, invokes a reasoning-tier juror only when the tiers disagree, and gates the next workflow step with a fail-closed Blockers / Warnings / Observations verdict.2046Transitions Devjakubantalik/transitions.devProduction-ready CSS transitions for web apps. Use when implementing notification badges, dropdowns, modals, panel reveals, page transitions, card resizes, number pop-ins, text swaps, icon swaps, success checks, avatar group hovers, error state shakes, search/input clear, skeleton loaders, shimmer text, sliding tabs, tooltips, staggered text reveals, card hover tilt, plus-to-menu morph, accordions, toasts, like buttons, learn-more hovers, checkbox checks, spinning counters, toggles, AI thinking states, reasoning streams, streaming text, matrix dot loaders, or banner stacking. Triggers on "add a transition", "animate the dropdown", "make the modal open smoothly", "swap icon", "page slide", "stagger animation", "open / close transition", "make it animate", "fade between", "success animation", "form error", "shake on invalid", "hover lift", "avatar stack hover", "clear the search", "skeleton loader", "loading shimmer", "shimmer text", "sliding tabs", "segmented control", "tooltip", "reveal text", "tilt card", "3D hover tilt", "cursor glare", "plus to menu", "FAB morph", "accordion", "collapsible", "expand / collapse", "disclosure", "toast", "snackbar", "like button", "heart animation", "learn more arrow", "checkbox", "check animation", "spinning counter", "odometer", "slot machine digits", "toggle", "switch", "thinking states", "AI status line", "agent reasoning", "reasoning stream", "streaming text", "stream words in", "matrix loader", "dot loader", "banner stack", "stacked toasts". Also "motion tokens", "scan for ad-hoc transitions", "replace hardcoded durations with motion tokens", "tokenize my animations", and the commands transitions reveal, transitions review, transitions apply, transitions refine.20434Writing Runbooksriekelt/technical-writerUse when writing operational documentation - runbooks, setup guides, release procedures, migration guides, deprecation guides, troubleshooting entries, or any ordered procedure someone will execute under time pressure. Encodes the runbook skeleton, the risk legend, the symptom-first troubleshooting format, and the migration-guide rules (mapping table, mandatory rollback, deprecation dates, built-in expiry). Use whenever someone will execute the text, even if it is called a "guide" or "setup notes".2041Nature Figureyuan1z0825/nature-skills>-203126Recording Decisionsriekelt/technical-writerUse when a decision needs recording - an ADR, a decision log entry, or when someone asks to write down why something was chosen, rejected, or superseded. Encodes the ADR and decision-log formats. Use whenever a choice was made that would otherwise live only in chat, even if nobody says "ADR".2031Documenting Legacy Codebasesriekelt/technical-writerUse when documenting an existing codebase whose documentation is missing, stale, or untrusted - an inherited system, a legacy application, a repo where the docs lie - or when regrounding a documentation tree against the code, or when someone asks what a system actually does. Encodes the survey-first inventory, the writer-side evidence hierarchy, depth-per-surface rules, the refactor test, dead-or-alive proofs, the quirks-and-findings split, the coverage ledger, the parallel campaign, and the docs-tree skeleton. Use whenever documentation must be reconstructed from the code rather than written alongside a change.2021Writing Issuesriekelt/technical-writerUse when writing or refining tracker items - epics, stories, tasks, bug reports, spikes, or acceptance criteria - or when turning a discussion, review finding, or plan into tickets. Encodes the survives-without-you test, the issue-type glossary, and the story and bug skeletons. Use whenever work is written into a tracker, even from a rough verbal dump.2021Diagramming Processesriekelt/technical-writerUse when a business process, workflow, lifecycle, or interaction between systems needs a diagram - a flow that prose serializes badly, a state machine, a message sequence, an enterprise process map - or when drawing the process documentation of a legacy campaign. Encodes diagrams-as-source, the notation ladder from ArchiMate to PlantUML, the kind-per-question table, behavior-level participants, the diagram index, and the same-change maintenance rule. Use whenever a document needs a graph rather than more paragraphs, even if nobody says "PlantUML".2011Writing Postmortemsriekelt/technical-writerUse when writing a postmortem, incident report, or root-cause analysis after an outage, a defect that reached users, a data issue, or a near miss - or when turning an incident channel, alert log, or war-room thread into a durable document. Encodes the blameless framing, the evidence-only timeline, contributing factors, and owned action items. Use whenever something broke and the write-up must outlive the incident.2011Documenting Contractsriekelt/technical-writerUse when documenting an HTTP API, message payloads, queue contracts, DTOs, file formats, or webhooks - or when writing the api-reference of a legacy campaign, or when callers keep asking what a field means or which errors an endpoint returns. Encodes the four detail levels, the DTO-first catalog, wire types with source anchors, the generated-spec one-home rule, and omitted-versus-null semantics. Use whenever a machine interface needs documenting for its callers, even if nobody says "API docs".2001Performanceaddyosmani/web-quality-skillsOptimize web performance for faster loading and better user experience. Use when asked to "speed up my site", "optimize performance", "reduce load time", "fix slow loading", "improve page speed", or "performance audit".2003Nature Polishingyuan1z0825/nature-skillsPolish, translate, or tighten existing academic prose while preserving facts, terminology, and evidence boundaries. Use for 论文润色、学术翻译、正文精简, or manuscript LaTeX layout fixes. Use nature-writing when the main task is drafting new sections or rebuilding the manuscript argument.19933Nature Writingyuan1z0825/nature-skillsDraft or restructure scientific manuscript arguments, sections, and initial-submission materials from author-provided evidence. Use for 论文写作、章节起草、论证重构、正文压缩、首次投稿材料. Use nature-polishing for language-only edits to existing prose and nature-response for post-decision correspondence.19977Nature Academic Searchyuan1z0825/nature-skillsSearch literature across sources, verify or manage citations, and build MeSH strategies or citation-impact audits. Use for 文献检索、引文核对、参考文献管理、严格他引 and evidence-backed citer profiles; not for translating a paper or drafting manuscript prose.19848Discernment Nudgeanthropics/skillsOfficial>1972Simple Englishaminblg/simpleenglish|1955Academy Guideanthropics/skillsOfficial>1932Flutter Build Responsive Layoutflutter/agent-pluginsOfficialUse `LayoutBuilder`, `MediaQuery`, or `Expanded/Flexible` to create a layout that adapts to different screen sizes. Use when you need the UI to look good on both mobile and tablet/desktop form factors.1931Install Anti Slopdmmulroy/anti-slopInstall, configure, update, or upgrade vendored anti-slop Oxlint plugins. Use when adding anti-slop, picking up upstream rules or fixes, or migrating an existing installation while preserving local customizations.19341Make Interfaces Feel Betterjakubkrehel/make-interfaces-feel-better>-1927Template Skillanthropics/skillsOfficialReplace with description of the skill and when Claude should use it.1901Nature Readeryuan1z0825/nature-skillsCreate source-grounded Chinese-English paper readers with aligned text, figures, tables, and equations. Use for 全文翻译、中英文对照、论文精读 or source-linked questions about a paper; respect a requested excerpt or question without generating a full reader.18920Transitions Polishjakubantalik/transitions.devPolish and refine existing motion against the transitions.dev motion-token scale — duration, distance, scale, blur, and easing — plus the rules for WHEN each token applies (open/close asymmetry, hover-in vs hover-out, stagger offsets, and intent delays). An add-on to the transitions-dev skill, focused on tuning what already animates rather than adding new transitions. Use when the user asks to "polish my transitions", "refine the motion", "tune the timing / easing", "make the animation feel better / less janky", "tighten the durations", "fix the stagger", "align to the motion tokens", "audit the motion", "review my animations", "scan for ad-hoc transitions", "tokenize my animations", or runs the commands transitions review or transitions polish. Also drives the Refine panel's Small refinement feature. Triggers on "motion polish", "transition polish", "refine motion", "timing feels off", "too slow / too fast", "stagger", "delay", "open close timing", "hover in out".1883P Videoqu-skills/superpowersGenerate videos with Pruna P-Video and WAN models via inference.sh CLI. Models: P-Video, WAN-T2V, WAN-I2V. Capabilities: text-to-video, image-to-video, audio support, 720p/1080p, fast inference. Pruna optimizes models for speed without quality loss. Triggers: pruna video, p-video, pruna ai video, fast video generation, optimized video, wan t2v, wan i2v, economic video generation, cheap video generation, pruna text to video, pruna image to video1871Obsidian Markdownkepano/obsidian-skillsCreate and edit Obsidian Flavored Markdown with wikilinks, embeds, callouts, properties, and other Obsidian-specific syntax. Use when working with .md files in Obsidian, or when the user mentions wikilinks, callouts, frontmatter, tags, embeds, or Obsidian notes.1864Nature Paper2pptyuan1z0825/nature-skillsCreate or improve a Chinese academic PPTX from a scientific paper or research reading notes, with source figures and speaker notes. Use for 论文做PPT、文献汇报、组会PPT and paper-based conference or defense presentations.18519