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21 English writing rules (12 from The Elements of Style, Orwell, Pinker and other classics, 9 from observed LLM habits) for clearer, leaner papers, grant proposals, design docs and documentation. Expository English only; not for fiction or marketing copy.

Open-source marketing toolkit with 78 skills for SEO audits, blog and landing-page copy, email sequences, social posting, ad campaigns and competitor analysis. Basic use needs no keys; pulling data from Semrush, GA4 or HubSpot, or publishing automatically, needs the matching API keys.

The five-agent PaperOrchestra pipeline (outline, figures, literature review, section writing, polishing) as skills: turns research ideas, experiment logs and a conference template into a LaTeX paper and checks citations via Semantic Scholar. Needs Python; verify the draft yourself.

Official SonarSource server: connects to SonarQube Server or Cloud so agents can query code issues, quality gates, security hotspots and dependency risks, and analyze file contents directly. Needs a SonarQube token; Docker is the recommended way to run it.

Official Firecrawl skill: drives the Firecrawl CLI to search, scrape, map site URLs, batch-crawl, interact with pages and monitor changes, returning LLM-ready Markdown. Search and scrape have a rate-limited free tier; crawling and monitoring need an account or self-hosted instance.

Firecrawl's official CLI: scrape, search, map and crawl sites and interact with pages in a browser from the terminal, with Markdown output; can also install companion skills for coding agents. Needs a Firecrawl account or API key, or point it at a self-hosted instance.

Manage Postgres databases on Neon in natural language: create projects and branches, run SQL, and use branches for migrations and query tuning. Remote server hosted by Neon with OAuth or API key auth and a read-only mode; Neon recommends it for development only.

15 marketing and growth skills for founders and small teams: SOPs, go-to-market plans, next growth moves, competitive intel, pricing, cold email outreach, landing page CRO, PRDs, and X and LinkedIn posts. Add a company context file to your project for output that fits your business.

Generates flowcharts, sequence diagrams, class diagrams and other charts from Mermaid syntax with configurable theme and background, exporting SVG or PNG files or a mermaid.ink share link. Validates syntax so the model can fix errors over several turns.

Redis's official MCP server: read and write strings, hashes, lists, streams, JSON and other data structures in natural language, with vector indexing and search and pub/sub. Bring your own Redis instance; runs via uvx.

Lets agents deploy a local folder or file contents straight to Google Cloud Run, list services and view their details and logs, and list or create GCP projects. Maintained by Google; sign in with gcloud and set up Application Default Credentials first.

Lets agents read and write Things 3 on the Mac (Inbox, Today, projects and tags), turning action items from a chat into tasks or walking you through a weekly review. Needs Things 3 (paid) with Things URLs enabled in settings, plus uv.

Railway's official CLI: deploy with railway up and manage infrastructure config, with token auth for non-interactive CI runs. The installer can set up the Railway skill and MCP for Claude Code, Codex and others in one step. Needs a Railway account.

Shopify's official agent plugin: searches Shopify docs and API schemas, validates GraphQL, Liquid and UI extension code, and can manage stores through the Shopify CLI. Sends usage telemetry by default; it can be turned off.

Turns Strunk's The Elements of Style (1918) into a writing skill so agents write docs, commit messages and error messages clearly and concisely. The full text (about 12k tokens) loads only when needed. By the author of Superpowers.

Official Docker skills: containerize projects, optimize and harden Dockerfile builds, orchestrate with Compose, use Docker Sandboxes and Docker Agent, with confirmation guardrails before deletes and other destructive actions.

Lets AI draw lines, create layers, insert blocks, add dimensions and export DXF or PDF in AutoCAD LT, for batch edits. Needs AutoCAD LT 2024+ on Windows, Python and uv; after cloning, load the bundled LISP script with APPLOAD. Can also generate DXF headlessly without AutoCAD.

SEO CLI and MCP server for agents: crawls your site for technical issues, uses Search Console data to rank fixes, and compares before and after. Needs Node.js 22+ and Google sign-in; keyword and competitor research needs paid data (DataForSEO, Semrush or Ahrefs).

Chroma's official MCP: lets agents create and manage collections, add documents, and retrieve them with vector search, full-text search and metadata filters. Connects to in-memory or local persistent stores, self-hosted instances or Chroma Cloud.

Official FSFE command-line tool that checks every file in a project for copyright and license information per the REUSE spec, adds headers in bulk, downloads license texts and generates an SPDX bill of materials. Needs Python; have legal review the results.

Resend's official MCP: lets agents send and receive email and manage contacts, broadcasts and sending domains. Use the hosted remote server with OAuth sign-in, or run the npm package locally with a Resend API key.

Open-source meeting connector that lets agents join Zoom, Teams or Google Meet as a participant, read the live transcript, chat and attendee list, and speak, e.g. to take meeting notes. Runs locally in Docker (image about 2.3 GB); transcription is local by default.

Postiz's official agent CLI: lets AI schedule posts to 28+ platforms such as X, LinkedIn, Instagram, TikTok and YouTube, upload images and video, and check post and account engagement. Ships with skills and a Claude Code plugin. Needs Node.js and a Postiz account (cloud or self-hosted).

Todoist's official MCP: lets agents find, create, update and complete tasks and projects and view to-dos by date. Use the hosted remote server with OAuth sign-in, or embed it as a tool library in your own AI app.