Evaluate a+b style arithmetic. Expression discarded.
claude mcp add --transport http 'calc-eval' 'https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/calc-eval/mcp'Run in a terminal; adds the server to Claude Code.
https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/calc-eval/mcpShort catalog of common HTTP status codes.
Common IANA timezone names for clock calls.
Check whether text is valid JSON. The body is discarded.
Fetch a public robots.txt and return group counts only.
Current time in a named IANA timezone.
Return origin, host, and path. Query and fragment are dropped.
Deploy applications and websites to Vercel. Use when the user requests deployment actions like "deploy my app", "deploy and give me the link", "push this live", or "create a preview deployment".
Deploy and manage projects on Vercel using token-based authentication. Use when working with Vercel CLI using access tokens rather than interactive login — e.g. "deploy to vercel", "set up vercel", "add environment variables to vercel".
Use for Vercel cost and performance optimization on deployed projects, especially Next.js, SvelteKit, Nuxt, and limited Astro apps. Collect Vercel metrics, usage, project config, and code scan results first; investigate only metric-backed candidates; produce ranked…
React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data…
Guide for implementing smooth, native-feeling animations using React's View Transition API (`<ViewTransition>` component, `addTransitionType`, and CSS view transition pseudo-elements). Use this skill whenever the user wants to add page transitions, animate route changes,…
Review UI code for Web Interface Guidelines compliance. Use when asked to "review my UI", "check accessibility", "audit design", "review UX", or "check my site against best practices".
Review docs/prose for Writing Guidelines compliance. Use when asked to "review my docs", "check writing style", "audit prose", "review docs voice and tone", or "check this page against the writing handbook".
Creates and maintains concise AGENTS.md and CLAUDE.md project instruction files. Use when asked to create AGENTS.md, update AGENTS.md, maintain agent docs, set up CLAUDE.md, document repository agent conventions, or keep coding-agent instructions minimal and reference-backed.
Write, review, and improve blog posts for the Sentry engineering blog following Sentry's specific writing standards, voice, and quality bar. Use this skill whenever someone asks to write a blog post, draft a technical article, review blog content, improve a draft, write a…
Write copy following Sentry brand guidelines. Use when writing UI text, error messages, empty states, onboarding flows, 404 pages, documentation, marketing copy, or any user-facing content. Covers both Plain Speech (default) and Sentry Voice tones.
Playwright Tools for MCP
Connect AI assistants to GitHub - manage repos, issues, PRs, and workflows through natural language.
MCP server for AI web browser automation using Browserbase and Stagehand
Next.js development tools MCP server with stdio transport
Give your AI agents trusted access to the full Postman platform.
Compile, lint, simulate (60 Hz), and render 3D scenes from Three.js to GLB, USDZ, Android & iOS.
