Discover skills, MCP servers, and plugins—with compatibility evidence for the agent you use.
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Protocol-compatible MCP servers are clearly labelled; verified integrations stay distinct.
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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.
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.
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.
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.
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URL parsing & building MCP.
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USGS Water MCP — wraps USGS National Water Information System (NWIS) REST services (free, no auth)
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Wikiviews MCP — wraps the Wikimedia Pageviews API (free, no auth)
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USAJOBS.gov MCP — US federal job postings
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Streaming availability across 200+ services: titles, sources, releases.
Wiktionary MCP — multilingual dictionary via Wikimedia REST + MediaWiki Action API
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urlscan.io URL scanner — search/result keyless, submit needs key