"An introduction to GraphQL" matching MCP connectors:
Matching Connector Tools:
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
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.
Agentic code review, no signup to try: reality gates + frontier-model review, with veto.
Can an AI shopping agent find, understand and BUY on a store? Deterministic e-commerce audit /100.
Give AI coding agents access to your Vynix visual feedback, bug reports, and AI diagnosis.
Check if your MCP server is ready to publish on the MCP Registry, Smithery, or npm.
Grade MCP servers A to F with the open behavioral litmus. npm: full toolset; hosted: lookups only.
Hire a real human for real-world verification, product testing, AI output review, and errands.
Scan URLs for WCAG 2.1 violations, generate AI fixes, and produce VPAT 2.5 compliance reports.
A flock of AI users tests your deployed app and reports where real people get stuck, with fixes.
Pay-per-call MCP server. Vetted human experts review AI-generated content (text, images, video, audio, social posts), audit reasoning chains, run prepublish safety checks, and gate high-stakes actions for human approval. 7 paid tools at $1.00 each plus 4 free tools (list_offerings, list_expert_profiles, get_result, verify_certificate). Payment via x402, USDC on Base mainnet. Approved outputs receive an on-chain Taste content certificate downstream agents verify before consuming.
130+ QA & dev tools for AI agents: prompt injection, RAG testing, VLM eval, guardrails. Free.
DummyJSON mock REST: products, users, posts, recipes, todos. Keyless test data.
Validate up to 75,000 URLs per job (status, redirects, response times). OAuth 2.1.
End-to-end API testing — generate and run tests from OpenAPI, curl, Postman, or real user traffic.
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).
MCP server providing access to the Scorecard API to evaluate and optimize LLM systems.