How to Use the CNJ (Datajud API Pública) MCP in Mastra AI

Build resilient, automated legal workflows with Mastra AI and the CNJ (Datajud API Pública) server.

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Connect CNJ (Datajud API Pública) MCP to Mastra AI

Create your Vinkius account to connect CNJ (Datajud API Pública) to Mastra AI 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 CNJ (Datajud API Pública) with Mastra AI

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Automated legal monitoring via Mastra AI workflows

Your workflow can call the `search_process_by_number` tool to track updates in TJSP or TRF1 and monitor court filings automatically. Law firms cannot afford missed court updates, and this tool ensures your agent has direct access to the source. If a court query fails due to temporary API downtime, Mastra's built-in retry engine handles the backoff. Your workflow keeps running without manual intervention, ensuring your internal databases stay in sync with official Brazilian records.

Deep Elasticsearch queries using this MCP Server

By running the `search_processes_advanced` tool, your Mastra agent can execute complex Elasticsearch queries across the entire Datajud database. This allows you to build automated legal research pipelines that find specific case patterns across multiple states. The agent processes the results, filters out irrelevant cases, and routes the high-priority lawsuits to the next step of your pipeline. You write the logic once, and the agent handles the heavy lifting of sorting through complex Brazilian court records.

Branching workflows based on court organ

The `search_processes_by_class_and_organ` tool lets your agent identify the specific court organ handling a case and branch the workflow accordingly. Different courts require different legal responses, making this classification step critical for automation. For example, if a case is flagged under a specific procedural class, the agent can automatically route the file to a specialized attorney or trigger a custom alert. It turns a manual triage process into a reliable, code-driven sequence.

Setup guide

Set up CNJ (Datajud API Pública) MCP in Mastra AI

Prerequisites

Node.js 18+ and a TypeScript project
@mastra/mcp + @mastra/core packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run npm install @mastra/mcp @mastra/core plus your preferred model provider (e.g. @ai-sdk/openai).
2

Configure the MCPClient
Create an MCPClient with your Vinkius endpoint as a URL object. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Discover and inject tools
Call mcpClient.listTools() and spread the result into your agent's tools object. All CNJ (Datajud API Pública) tools become native Mastra tools.
4

Run with any model
Swap openai("gpt-4o") for any AI SDK-compatible provider. Call agent.generate() and the agent routes tool calls through MCP automatically.

agent.ts

import { MCPClient } from "@mastra/mcp";
import { Agent } from "@mastra/core/agent";
import { openai } from "@ai-sdk/openai";

const mcpClient = new MCPClient({
  id: "cnj-datajud-api-publica-mcp-client",
  servers: {
    "cnj-datajud-api-publica-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

const agent = new Agent({
  name: "CNJ (Datajud API Pública) Agent",
  model: openai("gpt-4o"),
  instructions: "You have access to CNJ (Datajud API Pública) tools.",
  tools: {
    ...(await mcpClient.listTools()),
  },
});

const result = await agent.generate(
  "List recent CNJ (Datajud API Pública) transactions"
);
console.log(result.text);

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by CNJ Datajud. 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 CNJ (Datajud API Pública) MCP in Mastra AI

Instantiating the client is straightforward. Pass the server URL to the Mastra MCP client, fetch the tool list, and spread those tools directly into your agent's configuration object.

Yes. You can design workflows that query the API, analyze the lawsuit status, and conditionally trigger notifications or database updates based on the retrieved legal data.

Mastra's built-in retry mechanisms work alongside the server's stable connection pool. If the Brazilian court API experiences a transient error, the workflow retries the query automatically.

You can configure Mastra's human-in-the-loop feature to pause execution. The workflow will wait for an admin to approve the search parameters before hitting the court database.

No. All judicial processes and court organ queries are routed through a zero-trust, ephemeral sandbox. No search history, case numbers, or legal documents are persisted on our infrastructure.

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