"MCP servers that work without API keys" matching MCP connectors:
GET /v1/connectors — MCP directory API referenceMatching Connector Tools:
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.
Conformance checker for MCP servers. Free, no key, verdicts recomputable and re-measured daily.
Verify before your agent acts on data it paid for. Signed verdicts, checkable offline, via x402.
Testing, benchmarking and auditing autonomous AI agents — methods, harnesses, evidence
Accessibility and WCAG data for your own websites: fix lists, live checks, and fix validation.
Lint a SKILL.md for frontmatter, structure, secrets and size. All 6 tools free.
Author and validate Calaf workspace seeds against the app's real importer. No account needed.
Risk-scan a diff, flag AI-generated-code tells, find secrets. 5 of 7 tools need no account.
Generate synthetic random user data for testing, demos, and development without using real persona.
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.
Workflow planning, recovery checkpoints, coordination, fixtures, and compatibility tools for agents.
Moderated usability testing: read sessions, notes, transcripts, reports, and draft test scenarios.
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).
Prompt evals over MCP: run a prompt on your dataset, score each output 1-5 with an LLM judge.
Checks the structural integrity of translated resource dictionaries against a source dictionary y...
Score any URL against a real design contract — 42 checks, A-F grade, token + motion validation.
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.
Deterministic acceptance report for a supplied product catalog: validates price/currency/availabi...
Replay supplied records against old and new bounded JSON Schema draft-07 contracts. Receive exact...
Simulate a CSV import against a supplied typed column contract and return exact accepted rows, re...
