"Understanding Code Execution in Programming" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Risk-scan a diff, flag AI-generated-code tells, find secrets. 5 of 7 tools need no account.
Uxia brings AI user testing, usability testing and UX research into ChatGPT. It helps product managers, UX designers, researchers and developers evaluate websites, interactive prototypes and digital product experiences using AI-simulated users. Explore potential usability problems, investigate friction in user journeys and use findings to guide product and design improvements.
Check that your AI is being logical. Free tool that mathematically catches contradictions in agent reasoning. No account needed. Also offers paid guardrails that converts natural language to formal verification proofs, that anyone can check succinctly.
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
UI Verify is visual regression testing built for coding agents. Connect the MCP server and your agent (Claude Code, Cursor, Codex) pulls a pull request's UI changes into the conversation, views each visual diff, reads the AI judge's verdict of regression vs intended change, and accepts the intended baselines - all over MCP.
Rule engine with built-in simulation. 55 MCP tools for complete business rule lifecycle management.
Agentic code review, no signup to try: reality gates + frontier-model review, with veto.
Runs your code against a contract; HELD or BROKE at the exact input. Deterministic. 0.10 USDC/call.
What is known to be broken in an MCP server or API operation, with the check that found it.
A deterministic verification engine for agents. Proves a fix: fails on the old code, passes on new.
Machine-readable taxonomy of 100+ AI system failure modes spanning factuality, alignment, planning, code generation, and instruction following.
Whether a registry MCP server works for a stock client, and what changed in its tools. Free, no key.
X-Z-CS AI validation with auditable reasoning. 8 active tools; 5 in maintenance. v0.5.64
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.
Scan pasted Stripe webhook/checkout code for common integration bugs.
Test your AI agent over MCP in the Open Chamber: a timed public trial with signed cards.
Tests an AI agent's purchase against the task it was given. Paid per call in USDC via x402.
Give AI coding agents access to your Vynix visual feedback, bug reports, and AI diagnosis.
Accessibility pre-checks (WCAG/BFSG) in a real browser + statement drafts. Pay per call.
Deterministic JSON checks with signed evidence and x402-paid execution
