107 lines
3.6 KiB
Markdown
107 lines
3.6 KiB
Markdown
# Cursor Spec (Plugin Marketplace, Rules, Commands, Skills, MCP)
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Last verified: 2026-02-12
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## Primary sources
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```
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https://docs.cursor.com/context/rules
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https://docs.cursor.com/context/rules-for-ai
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https://docs.cursor.com/customize/model-context-protocol
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```
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## Plugin Marketplace
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Compound Engineering is published through the Cursor Plugin Marketplace.
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In Cursor Agent chat, install with:
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```text
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/add-plugin compound-engineering
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```
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Users can also search for "compound engineering" in the plugin marketplace.
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The repo-owned marketplace files are:
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```text
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.cursor-plugin/marketplace.json
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plugins/compound-engineering/.cursor-plugin/plugin.json
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```
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Do not use the old custom Bun converter/install path for Cursor.
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## Config locations
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| Scope | Path |
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|-------|------|
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| Project rules | `.cursor/rules/*.mdc` |
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| Project commands | `.cursor/commands/*.md` |
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| Project skills | `.cursor/skills/*/SKILL.md` |
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| Project MCP | `.cursor/mcp.json` |
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| Project CLI permissions | `.cursor/cli.json` |
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| Global MCP | `~/.cursor/mcp.json` |
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| Global CLI config | `~/.cursor/cli-config.json` |
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| Legacy rules | `.cursorrules` (deprecated) |
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## Rules (.mdc files)
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- Rules are Markdown files with the `.mdc` extension stored in `.cursor/rules/`.
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- Each rule has YAML frontmatter with three fields: `description`, `globs`, `alwaysApply`.
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- Rules have four activation types based on frontmatter configuration:
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| Type | `alwaysApply` | `globs` | `description` | Behavior |
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|------|:---:|:---:|:---:|---|
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| Always | `true` | ignored | optional | Included in every conversation |
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| Auto Attached | `false` | set | optional | Included when matching files are in context |
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| Agent Requested | `false` | empty | set | AI decides based on description relevance |
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| Manual | `false` | empty | empty | Only included via `@rule-name` mention |
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- Precedence: Team Rules > Project Rules > User Rules > Legacy `.cursorrules` > `AGENTS.md`.
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## Commands (slash commands)
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- Custom commands are Markdown files stored in `.cursor/commands/`.
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- Commands are plain markdown with no YAML frontmatter support.
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- The filename (without `.md`) becomes the command name.
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- Commands are invoked by typing `/` in the chat UI.
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- Commands support parameterized arguments via `$1`, `$2`, etc.
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## Skills (Agent Skills)
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- Skills follow the open SKILL.md standard, identical to Claude Code and Codex.
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- A skill is a folder containing `SKILL.md` plus optional `scripts/`, `references/`, and `assets/`.
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- `SKILL.md` uses YAML frontmatter with required `name` and `description` fields.
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- Skills can be repo-scoped in `.cursor/skills/` or user-scoped in `~/.cursor/skills/`.
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- At startup, only each skill's name/description is loaded; full content is injected on invocation.
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## MCP (Model Context Protocol)
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- MCP configuration lives in `.cursor/mcp.json` (project) or `~/.cursor/mcp.json` (global).
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- Each server is configured under the `mcpServers` key.
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- STDIO servers support `command` (required), `args`, and `env`.
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- Remote servers support `url` (required) and optional `headers`.
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- Cursor infers transport type from whether `command` or `url` is present.
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Example:
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```json
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{
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"mcpServers": {
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"server-name": {
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"command": "npx",
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"args": ["-y", "package-name"],
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"env": { "KEY": "value" }
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}
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}
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}
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```
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## CLI (cursor-agent)
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- Cursor CLI launched August 2025 as `cursor-agent`.
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- Supports interactive mode, headless mode (`-p`), and cloud agents.
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- Reads `.cursor/rules/`, `.cursorrules`, and `AGENTS.md` for instructions.
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- CLI permissions controlled via `.cursor/cli.json` with allow/deny lists.
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- Permission tokens: `Shell(command)`, `Read(path)`, `Write(path)`, `Delete(path)`, `Grep(path)`, `LS(path)`.
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