Professional AI Developer Tools
for Claude & Cursor
Eval harnesses, RAG pipelines, guardrails, model routing and more. Premium AI developer tools that work inside Claude and Cursor — install with a single command.
10 pro-grade helpers · Combined catalog value $149.90 · Each one verified, sandbox-tested, and Claude-reviewed.
Install in one line
Each tool drops into Claude / Cursor / Codex with a single mfkvault install command. No SDKs, no boilerplate.
Verified by Claude 4.5
4-step automated review: malicious code, prompt injection, quality scoring, similarity dedup. Every premium tool earns the verified badge.
Built for production
These aren't demos. RAG pipelines, observability, guardrails, fine-tuning workflows — every tool ships the way real teams use it in production.
The 10 premium tools
LLM Evaluation Harness
Run regression tests on your AI prompts. Score outputs automatically. Catch regressions before they reach production.
"My AI outputs change unexpectedly and I have no way to test them"
Prompt Version Manager
Track prompt changes, run A/B tests, rollback bad versions. Git for your prompts.
"I change prompts and break things with no way to rollback"
RAG Pipeline Builder
Chunk documents intelligently, rerank results, evaluate retrieval quality. Works with messy enterprise docs.
"My AI gives wrong answers because retrieval is broken"
AI Agent Scaffold
Production agent scaffold with tool calling, memory management, error recovery, and sandboxing. Better than LangChain.
"Building reliable AI agents from scratch takes weeks"
AI Cost & Latency Monitor
See exactly what your AI costs. Token usage, latency breakdowns, cost per feature. Stop overpaying.
"My AI API bills are huge and I dont know why"
AI Feedback Loop Builder
Collect thumbs up/down on AI outputs. Build review queues. Prepare fine-tuning datasets automatically.
"I have no way to collect feedback on AI outputs"
Synthetic Data Generator
Create synthetic training data, evaluation sets, and cold-start RAG datasets. Stop manually labeling data.
"I need training data but labeling is too expensive"
AI Safety Guardrails
Add safety filters to any AI pipeline. Detect PII, block jailbreaks, validate outputs. Compliance teams love this.
"My AI might leak PII or say harmful things"
AI Model Router
Automatically pick cheapest fastest model for each request. Route between Claude, GPT, Gemini intelligently.
"I use one expensive model for everything"
Fine-Tuning Pipeline Manager
End-to-end fine-tuning workflow. Curate datasets, run LoRA training, evaluate results. No more notebook chaos.
"Fine-tuning is a mess of scripts and notebooks"
Why pay for these?
The free tier of MFKVault has 970+ community helpers. Premium tools are different: each one replaces a $50–500/mo SaaS subscription (LangSmith, PromptLayer, Helicone, Llama Guard) with a one-time fee that you own forever.
Will my agent use them?
Yes — once installed, Claude / Cursor / Codex auto-discovers each tool and calls it on the right tasks. Your AI agent picks the eval harness when running tests, the RAG pipeline when answering questions, the guardrails when writing user-facing output.
Get all 10 inside Claude or Cursor
Free signup, $5 welcome credits, install with one command. Tools work inside any major AI agent.
Free register, get $5 creditsNo credit card · Auto Claude review · 30-second onboarding