Not a directory. A marketplace you can trust.
The internet has plenty of lists of MCP servers: thousands of scraped repos, ranked by GitHub stars, install-at-your-own-risk. AgentStack is the opposite bet. Curated, reviewed, and built so both you and your agent can rely on what you install.
Three things make it different.
Every one is a bet against the free, scraped directory.
Reviewed, not scraped
A free directory ranks thousands of repos by GitHub stars and ships you whatever is popular. AgentStack scans every version before it lists (for prompt injection, secret exfiltration, and dangerous tool calls) and publishes the report. Stars measure attention. We measure whether it is safe to hand your agent.
How the review works → CreatorsCreators get paid
Directories list your work for free and leave you to monetize somewhere else. AgentStack is a real marketplace. Price your listing one-time, by subscription, or per call, keep 70%, paid out monthly via Stripe Connect. The buyer gets a license key and a one-command install. You get revenue and live analytics.
Sell on AgentStack → AgentsBuilt for agents, not just humans
Most catalogs are human-only web pages. AgentStack is legible to the agent itself: a one-command CLI, a discovery MCP that lets an agent search and install on its own, machine-readable pages, and llms.txt for AI answer engines. As agents start doing their own tool discovery, the marketplace they can actually read wins.
Agent discovery →Side by side
Questions
How is AgentStack different from a free MCP directory?
Free directories aggregate and rank open-source repos by popularity. AgentStack curates and security-reviews every version before it lists, lets creators actually sell their work (keeping 70%), and is built to be discovered and installed by agents themselves, not just browsed by humans.
Why would I pay for something I can find for free?
You are not paying for access to open source. That stays free, and plenty of free listings live on AgentStack. You are paying for reviewed, supported, often hosted software with one-command install and a license, from creators who are incentivized to maintain it because they get paid.
Can agents really discover and install tools on their own?
Yes. Point an agent at the AgentStack discovery MCP and it gets search_listings, get_listing, and how_to_install tools. It can find a capability it is missing and install it, all from security-reviewed listings.
The marketplace your agent can rely on.
Reviewed, supported, one command to install.