"Developing an application by analyzing specified development and API documentation" matching MCP connectors:

Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.

Ask about the accessibility of websites in your own Inclusify account: what is failing, where it lives in your source, and whether the fix you just wrote actually works. Reads real scan data for your sites rather than giving generic WCAG advice, and can check a live page for keyboard traps, screen-reader reading order, forced colours and 400% zoom. OAuth sign-in, no API key to paste. Requires an Inclusify account.

Author and validate Calaf workspace seeds against the app's real importer. No account needed.

Drive real Android & iOS devices and web browsers from natural language for mobile + web QA. 290+ tools across device control, app management, automation sessions, browser automation, and flow recording / replay. Bearer-auth — get a token at robotactions.com → Profile → API Tokens.

Simulate, test, and analyze cloud architectures without deploying real infrastructure. Cloud World Model enables AI agents to model cloud environments, evaluate architecture behavior and costs, run failure and chaos simulations, and explore infrastructure scenarios across cloud providers.

Generate synthetic random user data for testing, demos, and development without using real persona.

Moderated usability testing: read sessions, notes, transcripts, reports, and draft test scenarios.

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

Scan GitHub-hosted AI skills for vulnerabilities: prompt injection, malware, OWASP LLM Top 10.

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.

Score any URL against a real design contract — 40 checks, A-F grade, token + motion validation.

Testing, benchmarking and auditing autonomous AI agents — methods, harnesses, evidence

Analyze, audit, fix and diff HTML, MJML, Maizzle and React Email across 21 email clients.

Lint a SKILL.md for frontmatter, structure, secrets and size. All 6 tools free.

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.

A skeptical senior-engineer code reviewer over MCP: risk-scans unified diffs, flags AI-generated-code tells, reports complexity hotspots, scans for leaked secrets, and runs an OWASP security pass — real analyzers, no external APIs. Free tier, no signup.

Regex matching, email/URL format validation, and JSON Schema validation.

A fully free linter for agent skill files: lint_skill validates YAML frontmatter, structure, size budgets, and safety phrasing with a pass/fail verdict; packaging_check validates zip layout against marketplace rules; plus regex_test, json_validate, diff_texts, and cron_explain for skill authors. No license or account required.

Deterministic motion compiler + validator: reports WCAG 2.2.2 pause-path candidates, fail-closed.