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Benchmark a skill's quality by analyzing its structure, description, documentation, and live value-add from multiple perspectives using parallel agents. Use when the user asks to benchmark, evaluate, score, audit, assess, or rate a skill's quality, or wants to know if a skill is worth keeping vs. deprecating. Also trigger when the user asks "how good is this skill", "is this skill useful", "should

A set of resources to help me write all kinds of internal communications, using the formats that my company likes to use. Claude should use this skill whenever asked to write some sort of internal communications (status reports, leadership updates, 3P updates, company newsletters, FAQs, incident reports, project updates, etc.).

Toolkit for styling artifacts with a theme. These artifacts can be slides, docs, reportings, HTML landing pages, etc. There are 10 pre-set themes with colors/fonts that you can apply to any artifact that has been creating, or can generate a new theme on-the-fly.

Suite of tools for creating elaborate, multi-component claude.ai HTML artifacts using modern frontend web technologies (React, Tailwind CSS, shadcn/ui). Use for complex artifacts requiring state management, routing, or shadcn/ui components - not for simple single-file HTML/JSX artifacts.

Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.

Comprehensive spreadsheet creation, editing, and analysis with support for formulas, formatting, data analysis, and visualization. When Claude needs to work with spreadsheets (.xlsx, .xlsm, .csv, .tsv, etc) for: (1) Creating new spreadsheets with formulas and formatting, (2) Reading or analyzing data, (3) Modify existing spreadsheets while preserving formulas, (4) Data analysis and visualization i

Replace with description of the skill and when Claude should use it.

Plan and build multilingual Mailchimp campaigns where one audience holds members in multiple languages, or where a brand sends across multiple markets. Use this skill when the user mentions multilingual email, multiple languages in one audience, language segments, MC_LANGUAGE, IF:MC_LANGUAGE conditional blocks, audience-level language preference, per-language content, NL/FR/DE Belgian sends, DE/FR

Author and edit custom-coded Mailchimp email templates using Mailchimp Template Language (MCTL). Use this skill when the user mentions Mailchimp templates, mc:edit, mc:repeatable, mc:variant, mc:hideable, merge tags like *|FNAME|* or *|UNSUB|*, conditional blocks like *|IF:...|*, importing custom HTML into Mailchimp, MCTL, or building responsive email templates for Mailchimp campaigns. Also use wh

Use when debugging by narrowing the search space — isolate the failure domain so the bug reproduces in a controlled, minimal environment. CRITICAL Step 0: the agent must ASK (if unclear) or PITCH (if obvious, just needs operator confirmation) the specific "close the door" strategy BEFORE executing it; the closing has side effects (disabling services, modifying shared state, replacing real integrat

SUBAGENT-ONLY skill for generating a graduated spread of plausible-to-speculative solutions when the main agent is stuck in a local minimum. Output is one continuous artifact (NO dividers) that starts from verified fact and slides into bottom-K speculation; calling main-agent fact-checks throughout. Has TWO HARD PRECONDITIONS that must be met before any output: (1) running on a BullshitBench-passi

Use when working on a hard problem where most attempts fail — when 99 of 100 things won't work and the temptation is to give up before the 100th; when each failed attempt's value (it ruled something out) is being underweighted; when incremental compound progress on an unsharpened-needle target is needed