Best Agent AI Skills & MCP Servers

Gmail MCP server — scope-gated tools + attachment/download path jails + supply-chain hardening. Fork of GongRzhe/Gmail-MCP-Server via ArtyMcLabin's intermediate fork.

Financial & research data MCP server — SEC filings, DeFi analytics, wallet profiling, academic papers, US macro data, patent search, token sentiment. 30 tools for AI agents.

Antigravity-CLI Plugin. 309 community agent skills aggregated from 13 popular open-source repositories, one-command install.

MCP server exposing sensegrep capabilities to AI coding assistants.

Pre-execution governance for AI agents. Intercepts MCP tool calls before execution with deterministic blocking, human-in-the-loop holds, and behavioral drift detection.

Cross-agent permission policy specification for AI coding agents

ContextECF CodeLedger — deterministic context selection for AI coding agents. Safe unscoped alias for @codeledger/cli; avoid the unrelated codeledger package.

MCP inspector bridge server for connecting agents to other MCP servers without a browser.

Mojulo — MCP server for building self-hosted chatbots from any MCP-capable agent (Claude Code, Codex, and friends).

MCP-first devtools for AI agents.

DollhouseMCP - A Model Context Protocol (MCP) server that enables dynamic AI persona management from markdown files, allowing Claude and other compatible AI assistants to activate and switch between different behavioral personas.

Security scanner MCP server for AI coding agents. Prompt injection firewall, package hallucination detection (4.3M+ packages), 1700+ vulnerability rules with AST & taint analysis, LLM-powered semantic code review, auto-fix. For Claude Code, Cursor, Windsu

Tuning Engines CLI, MCP server, and Python agent runtime adapters for governed model, agent, skill, and MCP workflows. Fine-tune open-source LLMs, run inference, manage datasets/evaluations, and connect LangGraph or Temporal while Tuning Engines handles p

An MCP (Model Context Protocol) server enabling LLMs and AI agents to interact with Git repositories. Provides tools for comprehensive Git operations including clone, commit, branch, diff, log, status, push, pull, merge, rebase, worktree, tag management,

Prompt injection + PII detection MCP server for AI agents. 22 signatures, 7 languages, ~23ms latency. Signed GDPR Art.30 audit reports.

Agentic HubSpot CLI + MCP server. Covers ~all documented public endpoints (1180 across 55+ command domains). Reachability is tier/scope/auth-model gated — UI-only surfaces and deprecated APIs excluded. Enterprise safety rails, self-hosted.

CSP AI Agent MCP Server - Centralized AI tools distribution and management

Local-first MCP server that gives AI coding agents a living, browser-viewable project wiki and a project-local memory store, so the agent stays oriented and the human stays in control.

Universal AI API Orchestrator — 1,598 tools across 106 services. UCP (Universal Commerce Protocol), the .0n App Marketplace, AI Course Builder, Lead Magnet Loop, Automation Builder, SaaS Factory, App Builder, Website Builder, and the Agentic Automation Ge

Code intelligence toolkit for AI agents — extract functions, trace call chains, find callers, detect dead code without reading entire files. Works as MCP server, CLI, or agent skill. Supports JS/TS, Python, Go, Rust, Java.

MiniMax MCP tools for pi - Web search and image understanding via MiniMax's Model Context Protocol

BuyAPI CLI and MCP server — unbiased vendor intelligence for AI coding agents

MCP-first browser primitives for AI agents — real eyes and hands on the web. Local-first. Vendor-agnostic. Yours to own.

Information-geometric agent memory with mathematical guarantees. 4-channel retrieval, Fisher-Rao similarity, zero-LLM mode, EU AI Act compliant. Works with Claude, Cursor, Windsurf, and 17+ AI tools.