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© 2026 AgentStackBuilt for people building better agents.

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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

bluegamma

Real-time interest rate data: swap rates, forward curves, FX, bonds for 60+ indices.

justonce-memory

Persistent, portable, bitemporal memory layer — recalled proactively across your AI tools.

rapidapi-metadata-extractor

Turns any URL into SEO metadata, contacts, tech stack, and AI-ready Markdown, in one call.

task-warrior-mcp

MCP server wrapping the Taskwarrior CLI for structured, project-scoped task management.

compression-ai-mcp

compression-ai-mcp MCP server by MEOK AI Labs

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config-validator-ai-mcp

config-validator-ai-mcp MCP server by MEOK AI Labs

cron-ai-mcp

cron-ai-mcp MCP server by MEOK AI Labs

mycal

Malaysia public holidays, school terms, business days & a leave optimizer (13 tools).

machfive

Generate hyper-personalized cold email sequences via MachFive API.

shade

Search, inspect, organize, annotate, share, and automate creative assets in Shade.

x402nano

Machine-payable prediction-market briefs and probability-change monitoring for AI agents.

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ai-summarizer

Summarize text or URLs into key points with compression ratio and reading time. x402 USDC.

luogu-mcp-server

Search Luogu problems, fetch statements, explore problem sets and get practice recommendations.

hyperxosist-agent

X feedback discovery, noise-reduced query planning, signal filtering, and AI handoffs.

clavis

Encrypted credential vault for AI agents — auto OAuth refresh, rate limiting, audit logging.

agnigateway-mcp

AI marketplace — flights, tours, activities, transport & more via MCP. No auth required.

dittu

Turns a phone into a camera+Bluetooth remote so AI assistants can see and control any PC.

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base64-codec

Encode/decode base64 and URL-safe base64. x402 micropayment.

foundry-zksync

Expose foundry-zksync (forge, cast, anvil-zksync) tools for zkSync Era development

hl-spot

Hyperliquid spot tokens, prices, volume, wallet balances. 454 tokens. x402 micropayment.

barcode-generator

Generate barcodes â€” EAN-13, UPC-A, Code128, Code39. Returns SVG. x402 micropayment.

csv-to-json

Parse CSV to JSON array. Auto-detect delimiter, headers. x402 micropayment.

gas-estimator

Multi-chain gas estimation â€” ETH, Base, Polygon, Arbitrum, BSC. x402 micropayment.

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fact-checker

Verify claims with web evidence. Returns sources and verdict. x402 micropayment.

color-palette

Generate harmonious color palettes â€” complementary, analogous, triadic. x402 micropayment.

email-send

Send emails programmatically via Resend. Text and HTML. x402 micropayment.

testkube-mcp

MCP server for Testkube - Manage test workflows, executions, and artifacts via AI assistants

dns-lookup

DNS record lookup â€” A, AAAA, MX, TXT, CNAME, NS via Cloudflare. x402 micropayment.

cron-parser

Parse, validate and explain cron expressions. Get next run times. x402 micropayment.

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code-sandbox

Execute Python, JavaScript, SQL code in a sandbox. x402 micropayment.

base-defi

Base chain DeFi yields — Aerodrome, Moonwell, APY, TVL, risk scores. x402.

bridge-routes

Best cross-chain bridge routes with fees, time, providers. LI.FI-powered. x402.

diff-checker

Compare two texts line-by-line â€” additions, deletions, unchanged. x402 micropayment.

crypto-news

Real-time crypto news with sentiment scores, token mentions. CoinGecko + CryptoPanic. x402.

defi-yields

Best DeFi yields by token — APY, TVL, risk, protocol. DeFiLlama-powered. x402.

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dex-quotes

Best swap quotes across DEXes (Uniswap, SushiSwap, Aerodrome). Base & Ethereum. x402.

nexus-memory-mcp

Persistent semantic memory for AI agents with knowledge graphs and Intelligence Packs.

domain-intelligence

WHOIS, DNS records, SSL certificate data for any domain in one call. x402.

hl-funding

HL perp funding rates for 229 markets. Sort, history, arb opportunities. x402.

sentiment-analyzer

Analyze text sentiment, emotions, confidence scores, and key phrases. x402 USDC.

token-price

Real-time crypto token prices â€” price, 24h change, market cap, volume. x402 micropayment.

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stock-price

Real-time stock quotes â€” price, change, volume, market cap. x402 micropayment.

funding-arb

Cross-venue perp funding rate arb — Hyperliquid, Binance, Bybit, OKX spreads. x402.

gas-oracle

Real-time gas prices, gwei tiers, USD cost estimates for Base and Ethereum. x402.

hash-generator

Cryptographic hashing — MD5, SHA1, SHA256, SHA512, bcrypt. x402 micropayment.

language-detector

Detect language from text via trigram analysis. 30+ languages, script detection. x402.

text-classifier

Classify text into categories with confidence, readability, content type. x402.

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merx

European business data — French company check, EU VAT validation, legal search.

token-safety

Token safety check — honeypot, tax, proxy, blacklist, risk score. GoPlus-powered. x402.

mcp-server

AI frontend governance for Contract context, graph artifacts, drift evidence, and repair prompts.