AI Tool Atlas
116 documented

Skills · plugins · MCP · rules114 official

Which agent do you use?

Pick your host to see what plugs into it. Every entry is documented from its official repository or docs, with install steps, permissions and limits.

Claude Code84 extensions OpenAI Codex14 extensions Cursor32 extensions Windsurf14 extensions Gemini CLI9 extensions GitHub Copilot1 extensions Any MCP client46 extensions
Skill · 19Reusable instructions and scripts the agent loads for a taskAlgorithmic Art, brand-guidelines, Canvas Design… Plugin · 42Bundles of skills, commands, hooks and agentsAgent SDK Development Plugin, C# LSP, clangd LSP… MCP server · 49Connect the agent to tools, data and servicesApify MCP Server, Atlassian Rovo MCP Server, AWS API MCP Server… Rules & instructions · 6Project instructions the agent reads every sessionAGENTS.md, CLAUDE.md, Cursor Rules…
MCP servers for Claude Code and CursorClaude Code plugins and marketplaceClaude Code skillsCursor rulesWhat is an MCP server? A plain explanation for 2026

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Rules & instructions

AGENTS.md

by AGENTS.md (Agentic AI Foundation, Linux Foundation)

Open Markdown format that gives coding agents project instructions, a README for agents read by Codex, Cursor, Gemini CLI, Windsurf and more.

Does
4 things
Install
5 steps
Works with
4 hosts
Rules & instructions

Cursor Rules

by Cursor (Anysphere)

Persistent prompt-level instructions for Cursor Agent: project .mdc rules, user rules, team rules and AGENTS.md.

Does
4 things
Install
4 steps
Works with
Cursor
Rules & instructions Apache-2.0

GEMINI.md

by Google

Context files named GEMINI.md that give Gemini CLI project instructions, personas and style guides on every prompt.

Does
6 things
Install
5 steps
Works with
Gemini CLI