Cerbos MCP Server for Mastra AIGive Mastra AI instant access to 6 tools to Authzen Evaluation, Authzen Evaluations, Check Resources, and more
GDPR Free for SubscribersMastra AI is a TypeScript-native agent framework built for modern web stacks. Connect Cerbos through Vinkius and Mastra agents discover all tools automatically. type-safe, streaming-ready, and deployable anywhere Node.js runs.
Ask AI about this MCP Server for Mastra AI
The Cerbos MCP Server for Mastra AI is a standout in the Developer Tools category — giving your AI agent 6 tools to work with, ready to go from day one.
Vinkius delivers Streamable HTTP and SSE to any MCP client
Geminiimport { Agent } from "@mastra/core/agent";
import { createMCPClient } from "@mastra/mcp";
import { openai } from "@ai-sdk/openai";
async function main() {
// Your Vinkius token. get it at cloud.vinkius.com
const mcpClient = await createMCPClient({
servers: {
"cerbos": {
url: "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
},
},
});
const tools = await mcpClient.getTools();
const agent = new Agent({
name: "Cerbos Agent",
instructions:
"You help users interact with Cerbos " +
"using 6 tools.",
model: openai("gpt-4o"),
tools,
});
const result = await agent.generate(
"What can I do with Cerbos?"
);
console.log(result.text);
}
main();
* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure
About Cerbos MCP Server
Connect your Cerbos instance to any AI agent to manage complex authorization policies through natural language conversation.
Mastra's agent abstraction provides a clean separation between LLM logic and Cerbos tool infrastructure. Connect 6 tools through Vinkius and use Mastra's built-in workflow engine to chain tool calls with conditional logic, retries, and parallel execution. deployable to any Node.js host in one command.
What you can do
- Permission Evaluation — Use
check_resourcesto instantly verify if a principal can perform specific actions on resources based on your policies. - Query Planning — Generate AST-based query plans with
plan_resourcesto filter database results according to user permissions. - AuthZEN Compliance — Leverage standardized access requests using
authzen_evaluationandauthzen_evaluationstools. - System Monitoring — Check instance health and build metadata using
get_server_infoandget_authzen_config.
The Cerbos MCP Server exposes 6 tools through the Vinkius. Connect it to Mastra AI in under two minutes — credentials fully managed, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.
All 6 Cerbos tools available for Mastra AI
When Mastra AI connects to Cerbos through Vinkius, your AI agent gets direct access to every tool listed below — spanning authorization, rbac, abac, and more. Every call runs in a secure, isolated environment with full audit visibility. Beyond a simple connection, you get real-time monitoring of agent activity, enterprise governance, and optimized token usage.
Authzen evaluation on Cerbos
Single action evaluation using the AuthZEN entity model
Authzen evaluations on Cerbos
Supports execute_all, deny_on_first_deny, and permit_on_first_permit semantics. Batch evaluation of multiple access requests using AuthZEN
Check resources on Cerbos
This is a read-only evaluation. Evaluates permissions for a principal on a set of resources
Get authzen config on Cerbos
Returns endpoint URLs for the AuthZEN APIs
Get server info on Cerbos
Returns the version and build details of the Cerbos instance
Plan resources on Cerbos
Produces a query plan for obtaining a list of resources a principal is allowed to access
Connect Cerbos to Mastra AI via MCP
Follow these steps to wire Cerbos into Mastra AI. The entire setup takes under two minutes — your credentials stay safe behind Vinkius.
Install dependencies
npm install @mastra/core @mastra/mcp @ai-sdk/openaiReplace the token
[YOUR_TOKEN_HERE] with your Vinkius tokenRun the agent
agent.ts and run with npx tsx agent.tsExplore tools
Why Use Mastra AI with the Cerbos MCP Server
Mastra AI provides unique advantages when paired with Cerbos through the Model Context Protocol.
Mastra's agent abstraction provides a clean separation between LLM logic and tool infrastructure. add Cerbos without touching business code
Built-in workflow engine chains MCP tool calls with conditional logic, retries, and parallel execution for complex automation
TypeScript-native: full type inference for every Cerbos tool response with IDE autocomplete and compile-time checks
One-command deployment to any Node.js host. Vercel, Railway, Fly.io, or your own infrastructure
Cerbos + Mastra AI Use Cases
Practical scenarios where Mastra AI combined with the Cerbos MCP Server delivers measurable value.
Automated workflows: build multi-step agents that query Cerbos, process results, and trigger downstream actions in a typed pipeline
SaaS integrations: embed Cerbos as a first-class tool in your product's AI features with Mastra's clean agent API
Background jobs: schedule Mastra agents to query Cerbos on a cron and store results in your database automatically
Multi-agent systems: create specialist agents that collaborate using Cerbos tools alongside other MCP servers
Example Prompts for Cerbos in Mastra AI
Ready-to-use prompts you can give your Mastra AI agent to start working with Cerbos immediately.
"Check if principal 'user_123' with role 'editor' can 'edit' resource 'document:abc'."
"Generate a query plan for 'view' action on 'expense' resources for principal 'manager'."
"Show me the Cerbos server build details."
Troubleshooting Cerbos MCP Server with Mastra AI
Common issues when connecting Cerbos to Mastra AI through Vinkius, and how to resolve them.
createMCPClient not exported
npm install @mastra/mcpCerbos + Mastra AI FAQ
Common questions about integrating Cerbos MCP Server with Mastra AI.
How does Mastra AI connect to MCP servers?
MCPClient with the server URL and pass it to your agent. Mastra discovers all tools and makes them available with full TypeScript types.Can Mastra agents use tools from multiple servers?
Does Mastra support workflow orchestration?
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