How to Use the Cerbos (Access Control) MCP in Cursor

Q: How do I install the Cerbos (Access Control) toolset in Cursor?

You can add it globally in your /.cursor/mcp.json file or locally in your project folder. Once added, Cursor's Agent mode can immediately access all nineteen tools from this MCP Server.

Q: Can Cursor run Cerbos (Access Control) evaluations during code generation?

Yes, Cursor uses checkresources to run live permission checks while you write code. This ensures the security logic your AI writes matches your active policies.

Q: Can I debug policy execution metrics in the editor?

Yes, you can ask the agent to run getmetrics to pull Prometheus data from your running engine. It helps you identify slow policy evaluations right from your chat sidebar.

Author Cerbos policies and test access rules directly in Cursor with this MCP Server while your agent writes your code.

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Create your Vinkius account to connect Cerbos (Access Control) to Cursor and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Cerbos (Access Control) with Cursor

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Generate real security code using live schemas

When you are writing a new API endpoint in Cursor, your agent can call `get_schema` to see exactly what attributes your resources require. It generates working controller code based on your actual Cerbos schemas instead of guessing the structure. This means the code Cursor writes actually works on the first try. It uses `check_resources` to mock the authorization calls inline, ensuring your middleware matches your active policies perfectly.

Validate policy changes using this MCP Server

While editing a YAML policy file in Cursor, you can ask this MCP Server to run `add_policy` or `update_policy` against a local test container. You get instant feedback on whether your syntax is valid without switching to a terminal window. If a rule fails, the agent uses `get_health` to verify the test engine is running and then rewrites the policy logic. It keeps your development loop tight and prevents broken rules from committing to your repository.

Build query plans for database filtering

Instead of guessing how to filter database rows based on user permissions, let Cursor call `plan_resources` to fetch the abstract syntax tree directly from Cerbos. Your agent can translate this AST into an SQL or Prisma query on the fly. This approach ensures your database queries only fetch rows the user is actually allowed to see. It bridges the gap between your central authorization rules and your database layer right inside your editor.

Setup guide

Set up Cerbos (Access Control) MCP in Cursor

Prerequisites

Cursor installed (macOS, Windows, or Linux)
Active Vinkius subscription with a valid endpoint token

1

Open MCP Settings

Go to Cursor Settings → MCP or open the Command Palette (Cmd+Shift+P / Ctrl+Shift+P) and search for "MCP: Add Server".
2

Add the Cerbos (Access Control) MCP

Cursor will create or open .cursor/mcp.json in your project root. Paste the JSON snippet on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Enable Agent mode

Open Composer (Cmd+I / Ctrl+I) and switch to Agent mode using the dropdown at the top. MCP tools are only available in Agent mode.
4

Verify the connection

Ask Cursor something like "List my recent Cerbos (Access Control) transactions." If the MCP tools are loaded correctly, Cursor will call the Cerbos (Access Control) tools automatically. You can also check Settings → MCP for a green status indicator.

.cursor/mcp.json

{
  "mcpServers": {
    "cerbos-access-control-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Cerbos. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Cerbos (Access Control) MCP in Cursor

You can add it globally in your ~/.cursor/mcp.json file or locally in your project folder. Once added, Cursor's Agent mode can immediately access all nineteen tools from this MCP Server.

Yes, Cursor uses `check_resources` to run live permission checks while you write code. This ensures the security logic your AI writes matches your active policies.

Absolutely, Agent mode is the best way to use this MCP Server because it allows the editor to read your schemas using `list_schemas` and write matching code automatically.

Yes, you can ask the agent to run `get_metrics` to pull Prometheus data from your running engine. It helps you identify slow policy evaluations right from your chat sidebar.

No, your schemas and policy definitions are only processed locally by the server. Cursor only sends the structural metadata returned by `get_schema` to the model to help write your code, keeping your proprietary business logic safe.

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