casper-marketplace

Opinionated conventions for authoring, restructuring, and reviewing agent skills. Use when deciding whether guidance belongs in `SKILL.md`, a conditional reference, or a smaller skill; writing trigger descriptions and reference routers; naming procedural or documentary skills; creating examples; keeping skill context focused; or bundling static assets and their licenses.

Opinionated conventions for designing focused agent-skill plugins as encapsulated, installable capabilities. Use when defining a plugin boundary, deciding which skills are public entry points, hiding shared implementation skills, splitting broad plugins, designing plugin structure, minimizing client manifests, or removing auxiliary package documentation.

Opinionated language-agnostic design rules for implementation, refactoring, and code review. Use when shaping conditional control flow, finite states, invariants, error boundaries, resource lifetimes, abstractions, public APIs, validation boundaries, pagination, missing values, or the separation of sans-I/O decisions from imperative drivers.

Opinionated language-agnostic test-admission and sans-I/O unit-testing rules. Use when proposing, writing, reviewing, or deleting tests; deciding whether behavior is project-owned; evaluating wrapper, schema, ORM, framework, mock, or third-party-library tests; or separating pure business policy from wiring and I/O.

Opinionated feature-first architecture conventions for cohesive modules, owned subtrees, entry points, shared-code promotion, and package boundaries. Use when designing or reviewing directory structure, placing UI or workflow code, splitting nested capabilities, extracting shared modules, enforcing feature import boundaries, deciding whether a feature deserves a package, or refactoring horizontal technical layers.

Opinionated `better-all` conventions for dependency-declared async task graphs, inferred task results, cancellation propagation, and failure semantics. Use when replacing serial `await` chains or manual `Promise.all` stages, parallelizing work with result dependencies, or writing and reviewing `all` and `allSettled` task definitions.

Opinionated logging and error-handling conventions for OpenTelemetry-compatible systems covering log levels, attribute naming, and error classification. Use when writing log statements, choosing log levels, or handling errors with traces.

Opinionated Python 3.13+ conventions for application and library code. Use when writing or reviewing Python typing, protocols, generics, finite states, optional values, exceptions, serialized-data validation, package exports, import layout, typed distributions, async resource ownership, async pagination, or per-distribution packaging metadata.

Opinionated React conventions for component boundaries, state ownership, derived values, explicit rendering, event work, external-system effects, memoization, context, and native forms. Use when creating or reviewing React components, hooks, conditional UI, form submission flows, state-sharing boundaries, or `useEffect` and `useMemo` usage.

Opinionated TanStack Query conventions for React server state: resolved-view boundaries, query ownership, cache identity, disabled inputs, actor-scoped data, mutations, form submissions, and invalidation. Use when creating or reviewing `useQuery` or `useMutation` hooks, query keys, fetch functions, mutation callbacks, loading/error views, or cache updates in React.

Opinionated TanStack Table v9 beta conventions for React table schema, per-table behavior, typed metadata, and header/cell/footer rendering. Use when creating or reviewing `useTable` tables, column definitions, row actions, table feature metadata, or `FlexRender` rendering in React.

Opinionated TypeScript conventions for inference-first typing, precise contracts, finite-state modelling, exhaustive decisions, and strict handling of optional or untrusted values. Use when writing or reviewing TypeScript types, state transitions, API signatures, schema-adjacent parsing, array or regular-expression access, or strict compiler errors.

Opinionated Valibot conventions for wire-schema ownership, nullability, tagged variants, transformations, and explicit validation-failure behavior. Use when defining or reviewing Valibot schemas, validating forms or HTTP payloads, parsing JSON or persisted data, or deciding whether invalid input aborts or becomes an expected branch.

Opinionated Zod v4 conventions for schema ownership, format validation, nullability, tagged unions, object-key contracts, transformations, and explicit validation-failure behavior. Use when defining or reviewing Zod schemas, validating forms or HTTP payloads, parsing JSON or persisted data, rendering validation errors, or deciding whether invalid input aborts or becomes an expected branch.

Create a PR to provided base branch using the pull request template. Use when opening a new PR.

Triage unresolved PR review comments, produce a severity-ordered fix plan, then resolve or fix each issue with subagents. Use when addressing PR feedback before merge.

LinkedIn post generation from meeting transcripts, Slack dumps, and other source material, written in the user's personal writing style. Use this skill when: generating LinkedIn posts, creating social content from internal material, ghostwriting LinkedIn content, or when the user mentions LinkedIn, social posts, or content generation from transcripts/notes. Supports personal style profiles stored locally per user. Can auto-pull source material from Fireflies.ai, Slack channels, and Google Drive.

Apply Casper security settings (deny rules, allow rules, telemetry env vars) to the user's Claude Code configuration. Use this skill when setting up a new machine, onboarding to Casper Studios, or when the user asks to apply/install/run marketplace security setup. Triggers on "set up security settings", "apply casper settings", "run marketplace setup", or first-time plugin installation.

Attio CRM operations for companies, contacts, and notes management. Use this skill when interacting with Attio CRM, searching companies, creating contacts, adding notes, or managing deal records. Triggers on CRM operations, company lookup, contact management, or Attio-related requests.

Social media and web scraping using Apify actors. Use this skill when scraping Twitter/X tweets, Reddit posts, LinkedIn posts, Instagram profiles/posts/reels, Facebook pages/posts/groups, TikTok videos, YouTube content, Google Maps businesses/reviews, contact enrichment (emails/phones from websites), or when auto-detecting URL type to scrape. Triggers on requests to scrape social media, get trending posts, extract business info, find contact details, or extract content from social URLs.

Scrape LinkedIn post commenters and export Lemlist-ready CSVs, with optional ICP filtering. Use this skill when the user wants to scrape engagement from a LinkedIn post, extract commenters, build a lead list from LinkedIn post interactions, generate a CSV for Lemlist import, or filter scraped contacts against an Ideal Customer Profile. Triggers on "scrape LinkedIn post", "get commenters", "LinkedIn engagement", "post engagers", "Lemlist CSV", "who commented on this post", "ICP filter", "ideal customer profile", or "filter leads".

Video downloading, stitching, title slides, and YouTube descriptions. Use this skill when downloading videos from Google Drive, creating title slides, stitching multiple videos together, or generating YouTube descriptions with timestamps. Triggers on video course creation, video editing, video compilation, or YouTube upload preparation.

Casper Studios internal design system for generating consistent, production-grade SaaS UI. Use this skill whenever generating UI code for internal tools, client apps, dashboards, POCs, prototypes, or any visual interface — even quick mockups or artifacts. Apply it any time the output is a React component, page, or layout. If the user mentions "our design system", "Casper style", "match our look", or asks you to build any kind of app or interface, use this skill. Also trigger when restyling or theming existing UI to match Casper's visual language. This skill takes priority over generic frontend-design guidance.

AI-powered document, image, and flowchart generation. Use this skill when generating images with fal.ai, creating flowcharts/diagrams, generating Google Docs, creating client proposals, converting markdown to PDF, or summarizing content. Triggers on image generation, diagram creation, document generation, or content formatting requests.

This skill should be used when auditing a codebase for AI agent readiness, or when guiding improvements to make a codebase work well with agentic coding tools. It applies when users ask to evaluate test coverage, file structure, type system usage, dev environment speed, or automated enforcement -- the five pillars that determine how effectively coding agents can operate in a project. Triggers on "audit my codebase", "make this agent-ready", "improve for AI agents", "agent-friendly", or questions about why agents struggle with a codebase.

Analyze and upgrade dependencies with breaking change detection. Use when updating frontend (pnpm) or backend (uv) dependencies.

Generate commit messages following conventional commits and commit staged changes. Use when creating commits or when user invokes /commit.

Universal fallback for executing actions across 1,000+ apps when no other skill is available. Use this skill ONLY when user requests an action on an app/service not covered by other skills (e.g., Notion, Asana, Trello, HubSpot, Airtable, Linear, Monday, Zendesk, Intercom, Stripe, Shopify, QuickBooks, Zoom, Microsoft 365, Dropbox, Box, Figma, Jira, Confluence, etc.). Do NOT use if another skill already handles the service. Triggers on requests to connect to external apps, execute actions on third-party services, or when user asks "can you actually do X" for an unsupported service.

Google Drive, Gmail, Calendar, and Docs operations via OAuth. Use this skill when uploading files to Drive, searching Drive folders, searching Gmail, finding calendar meetings, creating Google Docs, or managing folder structures. Triggers on Google Workspace operations, file uploads, email search, calendar search, or document creation.

Comprehensive CSV data analysis and visualization tool. Use this skill when analyzing CSV files, generating data summaries, creating visualizations from data, detecting outliers, finding correlations, assessing data quality, or creating data reports. Triggers on CSV analysis, data exploration, data visualization, data profiling, statistical analysis, or data quality assessment requests.

Data analysis, visualization, and storytelling skill for financial and RevOps contexts. Use when: analyzing revenue data, building forecasts, cohort analysis, churn modeling, pipeline analytics, creating data-driven reports, building dashboards, cleaning messy data, sanity-checking analytical claims, exporting to Excel with formulas, or extracting data from PDFs. Features decision logging, bias-aware interpretation, and progressive disclosure (slide deck -> detailed report -> full notebook with all decisions documented).

Casper Studios client onboarding playbook for new engagements. Use this skill whenever a PM is onboarding a new client, ramping up on an existing engagement, setting up a new project in Linear, preparing for discovery sessions, drafting outreach to client stakeholders, or synthesizing post-discovery interview outputs back into project requirements. Triggers include: starting a new client, help me onboard to a client, set up Linear for a project, I have a new engagement, help me prep for discovery, I just got added to a client project, or any combination of reading client docs + setting up project infrastructure + reaching out to client contacts.

Automate post-meeting follow-up: search Fireflies for a meeting transcript, generate a structured summary with key decisions, discussion points, action items, and next steps, then draft a professional follow-up email to all attendees via Gmail. Use this skill whenever the user mentions processing a meeting, creating meeting notes, sending a meeting recap, drafting a follow-up email after a call, summarizing a meeting, or anything related to post-meeting workflows — even if they don't use the word "meeting" explicitly (e.g., "recap my call with Acme", "send notes from the standup", "what happened in my sync with the design team and send it out").

Meeting transcript search from Fireflies.ai and Google Drive. Use this skill when searching for meeting transcripts, finding past client calls, retrieving conversation history, or exporting meeting notes. Triggers on transcript search, meeting history, call recordings, or Fireflies queries.

AI-powered email triage that reads your inbox, classifies each message by importance and urgency (Eisenhower matrix), decides whether you need to reply, and drafts responses in your voice. Use this skill whenever the user asks to triage their email, process their inbox, check what needs a response, draft email replies, prioritize messages, do an inbox review, or anything related to email workflow automation. Also trigger when the user says things like "what emails need my attention", "help me get to inbox zero", "process my unread mail", "draft replies", "what's urgent in my inbox", or "catch me up on email".