"Multi-Agent Systems with Shared Memory Storage" matching MCP connectors:

Workflow planning, recovery checkpoints, coordination, fixtures, and compatibility tools for agents.

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.

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

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

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

Generate realistic relational test data — 156 field types, 22 locales, JSON/CSV/SQL, free previews.

Read-only MCP server for the OPERANT AI operating-agent calibration benchmark.

Multi-Agent AI Validation: X-Z-CS Trinity. 13 tools FREE. Auditable reasoning. v0.5.54

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.

Drive OctoPerf load testing from any AI agent — import, edit, validate, run scenarios, read metrics. Hosted remote server, OAuth 2.1 (DCR + PKCE), no API key.

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.

MCP server providing access to the Scorecard API to evaluate and optimize LLM systems.

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

Evaluate, benchmark, and simulate AI agents on the VerifyAX agent-evaluation platform.

WCAG-Compliance/wcagc-mcp lets an assistant run real axe-core accessibility scans through the user's own wcagc account, rather than guessing accessibility from markup it can see. Tools cover a single URL or PDF, a full-site crawl, saved multi-step journeys, and violation trends.