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Frequently asked questions

What is AgentStack?+

AgentStack is a searchable, source-linked directory of 18,250 active agent tools: 1,575 skills, 16,628 MCP servers, and 47 plugins. We index public sources so builders can compare tools in one place.

What is an agent skill?+

An agent skill is usually a reusable SKILL.md document: instructions, workflows, and context that teach a coding agent how to handle a focused task. A skill can be installed into supported agent environments or read directly before use.

How do I install or use a listing?+

Open a listing and use its installation command when one is provided. For every listing, AgentStack also links to the original package or repository, so you can confirm the current setup steps and review the source before installing.

Are the listings free?+

Browsing AgentStack is free and needs no account. Each listing is independently maintained, so its license, pricing, and requirements come from its original publisher—always check the source page before adding a tool to an agent.

Browse taxonomy

Growth & Revenue65

Sales & Outreach16 SEO & Marketing49

Business Operations492

Analytics314 Business Ops178

Build & Ship595

Creative Studio80

Design & Presentations80

Workflows268

#ToolPopularity

instagit

MCP server for Instagit — AI-powered Git repository analysis for coding agents

eval-engine-mcp

Pay-per-call AI evaluation MCP server. Score LLM outputs against benchmark rubrics via Workers AI.

patchistry-mcp-server

DTC modular hat brand MCP server. 6 tools for AI agents: catalog, curated builds, shipping.

terravision

Cloud architecture diagrams generated from terraform plan, with official AWS, Azure, GCP icons

unlocalhost

Deploy localhost to a private, authenticated link from your AI coding agent.

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decisionmatrix-mcp

Deterministic multi-criteria decision analysis for AI agents — score, rank & explain options.

certidao

MCP server para gerenciamento de certidoes de cartorio via IA.

mneme-ai

Memory layer for AI coding assistants. Indexes git history + code, exposes via MCP.

shopify-mcp

Read-only MCP for the Shopify Admin GraphQL API. 6 tools, full read surface, multi-store.

property-shared

UK property data — Land Registry comps, EPC, Rightmove, rental yields, stamp duty, Companies House

payu-developer-mcp

Search PayU docs, browse the payment integration catalog, and fetch production-ready code.

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intenttext-mcp

Parse, validate, query, and render IntentText (.it) documents for AI agents

sovereign-engine

15 paid AI agent primitives via x402 (USDC on Base). Pay-per-call MCP server.

legal-ge

Find verified legal specialists in Georgia from natural-language queries. Trilingual (ka/en/ru).

mcp-server

Block prompt injection, evasive spacing, and obscene content before it reaches your LLM.

inite-brain-service

Open-source bitemporal memory layer for LLM agents — knowledge graph with conflict resolution.

precisioncalc-mcp

High-precision finance & business calculations for AI agents — exact decimals, never floats.

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agentstack-mcp

Deterministic reasoning stack for AI agents: simulate, decide & compute, plus cross-domain tools.

rootr-cli

Connect your team's living knowledge base — docs, data, issues, CRM — to Claude and ChatGPT.

router-mcp

Run the Intelliverse platform from any agent: apps, API keys, knowledge bases, email, media, chat.

mcp-server-zotero-dev

MCP server enabling AI assistants to build, test, and debug Zotero plugins

evalgate

Statistical checks an agent runs before trusting an AI eval number (is #1 real, judge bias, more).

agentdilemma

Submit a dilemma for blind community verdict with reasoning to improve low confidence

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clinicaltrials

ClinicalTrials MCP — wraps ClinicalTrials.gov API v2 (free, no auth)

feedhook-mcp

Turn a YouTube channel into a webhook: a signed HTTP POST seconds after every new video.

superhighway-mcp

Web search for AI agents — 5 tools: search, news, images, scrape, research. x402/USDC or API key.

bailii-mcp

Search UK case law on BAILII — court judgments with section extraction. Runs locally.

uk-legal-mcp

UK legal research — case law, legislation, Hansard, bills, votes, committees, HMRC, citations

dreissigacker-wine-concierge

Wine recommendations, food pairings & B2B contact for Weingut Dreissigacker, Rheinhessen.

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pay-mcp

USDC payments for AI agents on Base — direct, tabs, x402 paywalls, discovery

cisco-sdwan-mcp

MCP server for Cisco Catalyst SD-WAN (vManage): fabric inventory, device health, alarms, policies.

agentos

AI agent fleet orchestration runtime. Spawn, coordinate, monitor autonomous agents.

clickup

ClickUp MCP — wraps the ClickUp REST API v2 (BYO API key)

cms-open-payments

CMS Open Payments, with annual dataset discovery through the official DKAN API.

codestats

Code::Stats public coding-XP profiles (codestats.net)

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numguard

Verify a number before an agent asserts it — evals, backtests (Deflated Sharpe), signed receipts.

mcp

Tick-level Hyperliquid market data: fills, L4 book, funding, liquidations, smart triggers.

jsonlify

Validate and convert JSONL fine-tuning data across 11 AI providers. 13 tools.

postcopilot-mcp

Threads tools for AI — generate viral posts, download videos, export profiles

codeofpaper

Find GitHub implementations of arXiv research papers — paper lookup, ranked code, search.

agent-guard

Safety checks an agent runs before it acts: package malware, destructive command, secret leak.

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secret-safe-env

Write secrets into .env without the agent ever seeing the value - Windows masked dialog (繁中 UI)

forage

Self-improving tool discovery for AI agents. Find, install, and use new MCP servers automatically.

kolada-mcp

Swedish municipality statistics from Kolada API. 6000+ KPIs for all 290 municipalities.

oecd-mcp

OECD economic and statistical data via SDMX API. Access 5,000+ datasets across 17 categories.

stackguide-mcp

Dynamic context loading for AI assistants with TDD workflow and AST analysis

mycrab-mcp

Instant public HTTPS URLs for AI agents via Cloudflare Tunnels. x402 custom domains.

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mcp_weather_server

providing weather information, air quality data, and timezone utilities using the Open-Meteo API.

claws-mail-mcp-plugin

Claws Mail plugin exposing the running mail client over a local, bearer-token MCP endpoint.

pgtuner_mcp

provides AI-powered PostgreSQL performance tuning capabilities.