Cerbos MCP for AI Agents. Govern Policy-Driven Resource Access & Database Queries
Cerbos helps your AI agents manage complex, policy-driven resource access control. Connect this MCP to any client to evaluate permissions and generate optimized query plans instantly through natural language conversation.
Give Claude and any AI agent real-world access
Check if a user is allowed to perform an action on a given resource using check_resources.
Produce detailed, optimized query plans that restrict results based on the principal's permissions using plan_resources.
Evaluate multiple complex access policies at once using authzen_evaluations for standardized compliance checks.
Run a single, focused access check against the system model via authzen_evaluation.
Retrieve vital metadata about your Cerbos setup and its current policies using get_server_info or get_authzen_config.
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What AI agents can do with 6 Tools in the Cerbos MCP for Policy Evaluation
These tools allow you to check resources, plan queries, run batch evaluations, and retrieve system metadata directly from your AI agent chat interface.
Make your AI actually useful.
Add this MCP to Claude, Cursor, or Windsurf and your AI stops guessing. It gets real tools to look things up, take action, and handle the stuff you keep doing by hand.
Start using Cerbos MCPGet Authzen Config
Retrieves the specific endpoint URLs needed for using the AuthZEN APIs.
Authzen Evaluation
Performs a single, focused evaluation of an access request using the standardized...
Authzen Evaluations
Handles batch evaluations for multiple access requests, supporting complex...
Check Resources
Performs a read-only check to determine if a principal has permission on a defined...
Plan Resources
Generates an Abstract Syntax Tree (AST) query plan that filters database results...
Get Server Info
Returns version and build details, helping you verify the status of your Cerbos instance.
Security and governance baked right in.
Pick your AI client below to get set up. Just create a Vinkius account, subscribe, and you're instantly up and running. We handle the entire backend infrastructure, delivering out-of-the-box support for HTTPS Streamable, SSE, and OAuth2—zero messy routing required.
Choose How to Get Started
Build a custom MCP for your own tools, or connect a ready-made integration from our catalog.
Build Your Own
Turn any API into an MCP. Import a spec, define Agent Skills, or deploy with MCPFusion.
- Import from OpenAPI, Swagger, or YAML specs
- Create Agent Skills with progressive disclosure
- Deploy to edge with MCPFusion framework
- Built in DLP, auth, and compliance on each call
- Real time usage dashboard and cost metering
- Publish to catalog or keep private
Make Your AI Do More
Start with Cerbos, then connect any of our 5,200+ other servers whenever your AI needs more. One click, no limits.
- Use this MCP plus 5,200+ others, all in one place
- Add new capabilities to your AI anytime you want
- Connections are secured and governed automatically
- Track usage and costs across all your servers
- Works with Claude, ChatGPT, Cursor, and more
- New servers added to the catalog weekly
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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Cloud Hosted
Managed infra
V8 Isolated
Sandboxed per request
Zero-Trust Proxy
No stored credentials
DLP Enforced
Policy on each call
GDPR Compliant
EU data residency
Token Compression
~60% cost reduction
Cerbos MCP for AI Agents: Governing Resource Access Policies
Think about how you currently debug permissions. You open the dashboard, navigate through user roles, and manually run tests or use a series of separate API calls just to confirm if Principal A can perform Action B on Resource C. It's slow, it's tedious clicking across multiple screens, and it almost always requires writing temporary scripts that need cleaning up later.
With this MCP, you simply tell your AI agent what needs checking. The system instantly runs the policy evaluation. You don't write a single test script; you just get a clear answer: ALLOWED or DENIED. It changes debugging from an hours-long process into a quick chat exchange.
Cerbos MCP for AI Agents: Optimizing Database Query Plans
Before, when fetching data, developers often wrote queries that were too broad. They pulled back everything and then relied on the application code to filter out the sensitive records based on policy—a massive security risk and a performance killer.
Now, you generate an AST-based query plan using `plan_resources`. This ensures your database query is automatically constrained by the user's current policies. You get optimized data access right at the source.
What Cerbos MCP for AI Agents MCP does for your AI
Authorization logic is usually the messiest part of an application. You write it once, but you spend hours debugging it across different services and user roles. This MCP lets your AI agent handle that complexity directly in your chat window. Instead of calling five separate endpoints to check if a resource is visible or editable by a certain role, you just ask.
The system evaluates the policies instantly and tells you the outcome. You can even generate full query plans, so your downstream database calls are automatically filtered down to only what the user is authorized to see. Because this functionality handles core security logic, it's a perfect fit for Vinkius; you connect once from any compatible client and get access to robust policy management tools without writing boilerplate code.
019e3875-b811-7120-ad7b-d6113ef92763 How to set up Cerbos MCP for AI Agents MCP
The bottom line is that your AI agent handles all the complicated API calls; you just talk to it like talking to a teammate.
Subscribe to this MCP and provide your specific Cerbos instance base URL.
Your AI client connects, allowing you to interact with the policy engine through natural conversation.
You ask a question—for example, 'Can user X view resource Y?'—and the system returns a clear, definitive ALLOWED or DENIED result.
Who uses Cerbos MCP for AI Agents MCP
Security Auditors and Software Engineers need this. If manually debugging complex access rules across multiple services slows down your development cycle, this MCP is for you. It lets you verify policy logic instantly without touching the underlying database or writing unit tests.
Debugging a new feature's permissions by asking the agent to check resource access rules instead of running dozens of manual API calls.
Verifying that compliance policies hold up across different roles and sensitive data attributes, ensuring no unintended access paths exist.
Monitoring the health and configuration metadata of the Cerbos instance to keep sure the policy engine is running correctly in production.
Benefits of connecting Cerbos MCP for AI Agents MCP
Instantly verify permissions using check_resources. You no longer have to manually write API calls just to see if a user can edit a specific record.
plan_resources creates query plans that automatically filter database results. This means your application queries only pull data the user is actually allowed to see.
The batch evaluation tools, like authzen_evaluations, let you run full compliance checks across multiple policies at once—a huge time saver for security audits.
You get system visibility with simple calls like get_server_info. This lets your agent confirm the policy engine's version and build details on demand.
The standardized AuthZEN tools ensure your access requests meet industry compliance standards, reducing friction when building regulated applications.
Cerbos MCP for AI Agents MCP use cases
A user needs to see all sensitive documents for a department
Instead of writing complex SQL with multiple JOIN statements and manual role checks, the agent runs plan_resources. It returns an optimized query plan that automatically filters results so only records matching the user's department attribute are visible.
A new feature needs to check permissions for 20 different actions
Manually calling a permission endpoint twenty times is painful. The agent uses authzen_evaluations to run all 20 checks in one go, giving you an immediate pass/fail report for the entire feature set.
The team needs to debug why a specific user can't access a resource
Instead of asking three different developers to check their policies, the agent runs check_resources with the principal and resource details. It immediately pinpoints if the policy itself is blocking the action.
Need quick confirmation on system health before deployment
The engineer uses get_server_info to confirm that the Cerbos instance is running the expected version, making sure the policies haven't been compromised by an outdated build.
Cerbos MCP for AI Agents MCP tradeoffs
What to watch out for, and the recommended way to handle each one.
Writing policy checks in application code
Embedding if (user.role == 'admin') { return data; } else { throw Error('Forbidden'); } logic into every service method makes the codebase messy and hard to update.
Let your AI agent handle it. Use check_resources to verify permission status first, keeping all access decisions centralized in the policy engine.
Running multiple sequential API calls
To check 5 different resource types for a single user, you might make five separate HTTP requests, slowing down the agent and adding complexity.
Use authzen_evaluations to evaluate all 5 access requests in one batch call. This is faster, cleaner, and more compliant.
Ignoring query constraints
Writing a broad database query that returns millions of records, forcing the application layer to filter out forbidden data.
Always use plan_resources first. This generates a highly optimized plan that restricts your database query before it runs, saving compute time and improving security.
When to use Cerbos MCP for AI Agents MCP
Use this MCP if access control is the most complex part of your application. If you routinely find yourself writing repetitive code blocks to check roles or permissions—that's a sign you need centralized policy enforcement. This tool excels when you need to debug policies interactively, using check_resources for single checks or authzen_evaluations for bulk auditing.
Don't use this if your access rules are simple (e.g., 'all users can read'). For simple cases, a basic database column check is fine. You need this MCP when you deal with attribute-based logic ('a user can only edit documents they created in department X on weekdays'). If you just need to retrieve data and don't care about the complex rules governing who gets access to that data, then your standard database API will suffice.
Frequently asked questions about Cerbos MCP for AI Agents MCP
How does Cerbos MCP help me manage user permissions without writing complex code? +
It lets you talk to your AI agent and ask questions like 'Can this person do X on Y?' The system handles the entire policy evaluation, giving you a definitive answer. This cuts out hours of manual API scripting.
Is Cerbos MCP better than just using database roles for access control? +
Yes. Database roles are static; this MCP allows dynamic, attribute-based checks. You can enforce policies based on things like a user's department or the resource's creation date, which is much more flexible.
What if I need to see all resources for a given project? Does Cerbos MCP handle that? +
It does. You can use the query planning tools within the MCP. It generates an optimized filter you can apply directly to your database, so you only retrieve authorized records.
Does connecting the Cerbos MCP affect my existing application logic? +
No. The MCP acts as a policy layer that your AI agent calls when needed. It enhances your current workflow by providing an external source of truth for all access decisions, so you don't have to change core business logic.
Can I check compliance across many different users at once using Cerbos MCP? +
Absolutely. You can use the batch evaluation tools in the MCP. This lets you run large-scale audits, checking hundreds of potential access combinations with a single prompt.