"Files formatted in JSON" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Check an A2A agent before you delegate, or an MCP server's measured conduct. Free, no key.
Audit public webpages and supplied markup for HTML, CSS, SEO, JSON-LD, and link issues.
Preflight FactoryTalk View import CSV files before import. Detects deterministic schema, row, field, and compatibility issues and returns structured exceptions for review.
Run EPUBCheck for EPUB specification errors and compare two exports.
Parse WebVTT, SRT, or TTML for conformance, timing, overlaps, line length, and reading speed.
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
Rule engine with built-in simulation. 55 MCP tools for complete business rule lifecycle management.
AI users run real tasks on your live site and show where they get stuck, with a replay of every step
Validate CSV columns, find duplicates and invalid values, and clean files with explicit rules. Row-level reports, no stored files. Run the fixed free sample without a key. Custom CSV: EUR 9 for 100 operations, valid 90 days, no subscription. Setup: https://import-check-production.up.railway.app/docs/
Prompt evals over MCP: run a prompt on your dataset, score each output 1-5 with an LLM judge.
Simulated people test your pages, copy and sign-up flows, and say why they would leave.
Write Polyxd UI documents, check them, and show them as real screens in any design-system pack.
What is known to be broken in an MCP server or API operation, with the check that found it.
X-Z-CS AI validation with auditable reasoning. 8 active tools; 5 in maintenance. v0.5.64
Whether a registry MCP server works for a stock client, and what changed in its tools. Free, no key.
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.
Probe a signup URL you own and score whether an AI agent can sign up unaided.
Compare two versions of a JSON row list: what was added, removed or changed, field by field.
