"User interfaces (UI) or UI design resources" matching MCP connectors:

Generate synthetic random user data for testing, demos, and development without using real persona.

Evidence-gated task verification for AI agents. Decompose goals into acceptance criteria, attach proof (screenshot, curl, file), independent LLM judge accepts or rejects. 24 tools. Hosted remote MCP (streamable-http, OAuth 2.1 + DCR).

Score any URL against a real design contract — 40 checks, A-F grade, token + motion validation.

Point Claude Code, Qwen Code, Cursor, or any MCP client at https://docs.jmeter.ai/api/mcp and your agent answers JMeter questions grounded in this documentation, with a source link for every answer. Free, no API key, no signup.

Voice-powered bug reporting with 13 MCP tools. Record bugs by talking; let AI find and fix them.

A fully free linter for agent skill files: lint_skill validates YAML frontmatter, structure, size budgets, and safety phrasing with a pass/fail verdict; packaging_check validates zip layout against marketplace rules; plus regex_test, json_validate, diff_texts, and cron_explain for skill authors. No license or account required.

Scan any website or MCP server for agent readiness: 0-100 score, a fix per failing check. Free.

Check if your MCP server is ready to publish on the MCP Registry, Smithery, or npm.

Runs your code against a contract; returns HELD or BROKE at the exact input. Deterministic.

Evaluates UI designs for WCAG accessibility issues automated scanners miss. Paid via x402 on Base.

End-to-end API testing — generate and run tests from OpenAPI, curl, Postman, or real user traffic.

Estimated game fps for any GPU or Apple Silicon chip, with the limiter and tweaks.

Deploy AI user personas to validate user journeys at scale. Find UX friction before real users do.

MCP server for e-mail testing: create disposable inboxes, wait for delivery, and extract e-mail content or links - all from your AI agent or test automation workflow. Get a free API key on https://app.zyntra.app/

Validates cron expressions and finds DST bugs that make jobs silently skip or double-fire.

Audits MCP tool definitions for patterns that make models call tools wrong or mis-fill args.

WCAG-Compliance/wcagc-mcp lets an assistant run real axe-core accessibility scans through the user's own wcagc account, rather than guessing accessibility from markup it can see. Tools cover a single URL or PDF, a full-site crawl, saved multi-step journeys, and violation trends.

Your agent tests pages, copy, and flows on simulated users while you build.

AI-native mock API server with MCP. Create REST/SOAP mocks from Claude, Cursor, or Windsurf.

Katalon True Platform MCP: design tests, run with AI, upload reports, assess release readiness.