"List of This Week's 15 Most Popular Free Minecraft Servers" 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.
Generate structurally valid test IBANs for 91 countries (MOD-97 and national check digits), validate any IBAN and export lists. Free, no sign-up.
Validate and clean CSV before import. Find duplicates, missing values and invalid dates with row-level reports. Apply only the cleanup you request; files are not retained. Run view_csv_demo free without a key. Custom CSV: EUR 9 for 100 operations, valid 90 days, no subscription. Setup: https://check.orvel.dev/docs/
Lint a SKILL.md for frontmatter, structure, secrets and size. All 6 tools free.
Free AI test helpers: injection inputs, OWASP mapping, release plans, response and tool-call packs.
Risk-scan a diff, flag AI-generated-code tells, find secrets. 5 of 7 tools need no account.
Ensemble testing of web pages for accessibility, usability, and standards conformity
Diagnose why an AI agent failed and get the verified fix instantly. Free, no token.
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/
An open-source benchmark of how well LLMs solve nonogram puzzles, from 5x5 to 20x20.
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.
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.
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).
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
Free WCAG 2.2/ADA/508 accessibility MCP: scan, AI fixes, verify, vision audit, localhost tunnel
Checks a public website in six areas and returns scores from 0 to 100. Free, no key needed.
Does an MCP server work for a stock client? By registry name or URL. Tool drift too. Free, no key.
Deterministic data tools: price list diff, PDF tables, feed validation, data mapping, table diff
Verify an agent's output before you pay: JSON Schema + rules, signed receipts. Free during launch.
Check whether AI assistants can reach, read and cite a public website. No account for 4 of 5 tools.
