"Assistance with Debugging Frontend Issues Using JavaScript Code" matching MCP connectors:

Prompt evals over MCP: run a prompt on your dataset, score each output 1-5 with an LLM judge.

Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev

Agentic code review, no signup to try: reality gates + frontier-model review, with veto.

Real-browser WCAG audit that also finds keyboard-inoperable controls axe-core misses, with fixes.

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

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

Grade MCP servers A to F with the open behavioral litmus. npm: full toolset; hosted: lookups only.

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

Machine-readable taxonomy of 100+ AI system failure modes spanning factuality, alignment, planning, code generation, and instruction following.

A flock of AI users tests your deployed app and reports where real people get stuck, with fixes.

Benchmark-first release surface with a read-only MCP endpoint and operator CLI.

MCP-native AI browser testing for coding agents. Submit a URL + goal, get back action trail, bugs, screenshots, and WebM video your agent patches from directly. 43 tools, 12 AI evaluation personalities, combo tiers with auto-pause-on-bugs, throwaway email + SMS inboxes.

MCP server: NEED + YIELD + CLEAN-MONEY gates with EIP-3009 attestations · Hive Civilization

Pre-commit code quality guardian. Detects semantic drift in AI-generated code.

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

MCP server for static security analysis of Android source code

Test-inbox API for email and SMS: create inboxes, long-poll messages, extract OTPs and links. 34 tools; bearer auth with an mfx_ API key (free tier).

Rule engine with built-in simulation. 55 MCP tools for complete business rule lifecycle management.

295k+ bug-fix patterns with MCP Hub proxy, PII filtering, and code search

Capture screenshots, detect visual regressions between page versions, and analyze with AI.