Best Protocol AI Skills & MCP Servers

Persistent key-value memory — store and recall information across sessions as JSON files.

In-memory file cache — avoid redundant disk reads with mtime-based invalidation.

MCP server for n8n API integration

LemonSqueezy MCP server for managing your store from AI assistants

Spec-driven toolkit for AI agents — skills, rules & prompts via MCP

Knowledge base — index documents, search by content, fetch entries, purge stale data, rank by relevance.

MCP server for Kodebase — fetch tasks, comments, feedback, and create pull requests from Claude Code

MCP server middleware for atrib. Signed receipts for every tool call, one-line integration.

MCP server exposing Windy Word's agent-control surface as 95 typed tools (paste / hotkeys / transcription / recording verbs / audio devices / voice clones / install / Doctor / archive / translation / documents / soul-file).

MCP server for Microsoft Graph Teams integration

Change impact analysis — given a file or symbol, find what files are affected by a change.

SkyReels MCP server for AI tool integrations.

Symbol Delta Ledger MCP Server - Cards-first code context for polyglot repositories

Model Context Protocol server for Meta Marketing API integration

MCP server for BYTE Library — per-byte USDC data feeds for AI agents on Arbitrum. Subscribe to first-party feeds or pay-per-call via x402; every settlement carries an EIP-712 PayloadAttestation receipt. No API keys, no token.

MCP server for ProjectsFlow — gives Claude Code access to your project credentials and kanban tasks

Project onboarding workflow — auto-discover project structure, conventions, and key files for a new contributor or AI agent.

High-performance API and Model Context Protocol (MCP) server for validating Mermaid diagrams with comprehensive security features, multiple transport options, and enterprise-grade capabilities

Local MCP relay for browser WebMCP tools via embed iframe and localhost WebSocket

Production-grade MCP servers for Indian APIs - Stocks (NSE/BSE), Banking (IFSC/UPI), GST, Railways, and RTO.

Hello-world brick — returns the message it receives. Serves as a smoke test for the FocusMCP pipeline.

Shared Zod schemas and TypeScript types for the mpak registry

Token budget management — estimate and optimize token usage for AI agents.

A manager server for MCP servers that handles process management and tool routing