MCP Server Directory

PaperAgent — Send Physical Mail dev.paperagent/letters

Mail one-off USPS letters from ChatGPT or Claude after you approve the preview and price. US only.

FixMyJSON io.github.tonbifun/fixmyjson

Repair broken LLM JSON and check it against a JSON Schema. Flags cut-off output. Free trial.

ENT ONE school workspace for parents: teacher messaging, liaison book, homework, news.

JsonMend dev.workers.mike-tusa.jsonmend/jsonmend

Repair broken JSON from LLM output and validate it against a JSON Schema.

Ginta app.ginta/ginta

AI website builder: build, publish and edit websites from Claude, ChatGPT or Claude Code.

Shopify MCP by InsightfulPipe com.insightfulpipe/shopify

Hosted Shopify MCP server for Claude, ChatGPT and Cursor, with each action switched per account.

2nd Brick io.github.noahgsolomon/2nd-brick

Design custom LEGO brick sets with 3D models, instructions, kit prices and customer-paid checkout.

AgentsIndex ai.agentsindex/mcp

The editors' index of AI-native software, from AI agents to the models and frameworks behind them.

Full jitter exponential backoff retry scheduling and half-open circuit breaker for LLM APIs

Turbulence Modeling Resource io.github.pipeworx-io/turbulence-modeling-resource

NASA Langley Turbulence Modeling Resource (TMR) — verification and validation cases for…

Compare AI subscription prices (ChatGPT, Claude, Gemini, Grok) across 130+ verified shops.

ChatAd (chatad.kr) kr.chatad/chatad

Manage ChatGPT (OpenAI), Google & Meta ads by chat: daily briefs, budgets, campaigns (KR).

Agent Toolbox io.github.zaffy18/agent-toolbox

Everyday tools for AI agents, paid per call with x402: images, markdown, speech-to-text, embeddings.

NovAI Prices io.github.vvvvking/novai-prices

Live prices for 111 Chinese models; batch cost calculators for video and images.

Record a browser flow once with a model, then compile it to a Playwright spec that needs no model.

Preloop io.github.preloop/preloop

Open-source AI agent control plane and software factory: govern every tool and model call.

Search and read your saved ChatGPT and Claude chats, kept on your own computer.

Checks ML model files (pickle, PyTorch, joblib, NumPy, GGUF, ONNX) for code that runs on load.

Turn any web page into clean Markdown, text or token-bounded RAG chunks (via RapidAPI).

High-throughput JSON-RPC 2.0 batch pipelining and inter-tool parameter dependency resolver for Model

Yumi Cost-Aware Diagnostic Planner site.chatgpt.no-qt.noqt/yumi-cost-aware-diagnostic-planner

Exact expected-cost diagnostic policies for caller-supplied finite deterministic fault models.

Local, private long-term memory for AI: verbatim, searchable, correctable. No LLM or API key.

Multi-model LLM token cost budget ledger and burn rate forecaster enforcing spending limits and earl

Token entropy and n-gram perplexity analyzer auditing LLM outputs for degenerate repetition loops an