Inside the AI tool you already use.

Install the plugin

Claude

claude.ai · Claude Desktop · Cowork · Claude Code

In Claude, there is one flow, through the plugin: install the IAJUS plugin from the marketplace, then connect the connector and authorize the tools on the plugin's own page. No manual connector setup.

1. Open Customize and click Browse plugins.
2. In the Directory, go to Plugins and select Personal.
3. On the + button, choose Add marketplace.
4. Choose to add from a repository and paste https://github.com/rafaelob/iajus-plugin-public.
5. Install the IAJUS plugin. On its page, go to Connectors and click Install on the iajus connector.
6. Sign in with your IAJUS account (your usual login at app.iajus.com.br).
7. Click Authorize. The connector searches on your behalf, Lex research stays in your IAJUS account history, and you can disconnect at any time.
8. Done: Claude confirms the connection and you can return to the conversation.
9. When Claude asks, authorize the tools. Lex research is in beta, with a limit per account. In the tool permissions, choose Always allow only for the search and reading tools. Keep the tool that cancels a deep search on Needs approval, so Claude asks before using it.

In Claude Code (terminal), the same plugin installs with two commands, and the login is the same as on the platform:

/plugin marketplace add rafaelob/iajus-plugin-public
/plugin install iajus-juris@iajus

Published plugin

ChatGPT and ChatGPT Work/Codex

The same plugin in conversations and in Work/Codex tasks

The IAJUS plugin is published in the ChatGPT plugin directory: find it through search, add it with one click and sign in with your IAJUS account. It then works the same way in a regular conversation and in a Work/Codex task.

1. Open the Plugins section and search for IAJUS. The plugin appears under Public: click + to add it.
2. Sign in with your IAJUS account: email and password, or Sign in with Google.
3. Review the permissions and click Authorize. Access is read-only to the case-law and legislation collection, and you can disconnect at any time.
4. In a conversation (or a Work/Codex task), call the plugin with + or by typing @IAJUS.
5. Type your legal question in the message box, with IAJUS already selected.
6. The answer shows how the courts have ruled, with the official source link for each citation.

IAJUS in ChatGPT, with a video (Portuguese)

MCP connector

Mistral

Vibe Work (chat.mistral.ai)

In Vibe Work, an administrator adds IAJUS as a custom MCP connector and you sign in with your IAJUS account (OAuth 2.1). On the Free, Pro and Student plans, the account holder is the administrator. Use the server address https://mcp.iajus.com.br/mcp.

Le Chat is now called Vibe. These steps follow the Vibe Work documentation, checked on October 16, 2026.

1. As an administrator, open Connectors, click + Add Connector and select the Custom MCP Connector tab.
2. Set Connector name to iajus and Server URL to https://mcp.iajus.com.br/mcp. The description is optional. Vibe Work detects the authentication method automatically.
3. Click Connect, sign in to your IAJUS account and review the consent screen before clicking Authorize.
4. In Connectors → My Connectors, open the connector and its Functions tab. Review each function before turning on Always allow; keep manual approval for actions you want to confirm.
5. Once the connector is on, ask Vibe Work in natural language to search the IAJUS collection.
6. Check the records and source links before citing the precedents you found.

MCP connector

Manus

manus.im

In Manus, add IAJUS with the add MCP by URL feature (beta) and sign in with your IAJUS account (OAuth 2.1). All you need is the server address https://mcp.iajus.com.br/mcp.

1. Open Plugins in the side menu.
2. In the create menu, choose to add an MCP by URL (beta).
3. Set the server name to IAJUS and the server URL to https://mcp.iajus.com.br/mcp, then save.
4. On the connector card (a custom MCP), click Connect.
5. Your browser opens the IAJUS login: sign in with your account.
6. Click Authorize. Access is read-only.
7. Turn on the IAJUS toggle in the message box and ask in natural language.

MCP connector

Grok

grok.com (SuperGrok)

In Grok, add IAJUS as a custom connector and sign in with your IAJUS account (OAuth 2.1). All you need is the server address https://mcp.iajus.com.br/mcp.

1. In the message box, open the + menu and choose to add a connector.
2. In the new connector dialog, go to Custom (add your own connector).
3. Set the name to IAJUS and the server URL to https://mcp.iajus.com.br/mcp, then confirm.
4. Your browser opens the IAJUS login (app.iajus.com.br): sign in with your account.
5. Click Authorize (the consent screen names the client Grok).
6. To use it, type @ in the message box (Connectors → IAJUS) or start your question with IAJUS.
7. The answer comes with its grounds and the court's official source.

MCP connector

Perplexity

perplexity.ai · Pro plan

In Perplexity, add IAJUS as a custom connector and sign in with your IAJUS account (OAuth 2.1). All you need is the server address https://mcp.iajus.com.br/mcp.

1. Open Customize → Connectors and click to add a custom connector.
2. Set the name to IAJUS and the MCP server URL to https://mcp.iajus.com.br/mcp, tick the box confirming you understand the risks of custom connectors, and click Add.
3. The IAJUS connector appears as New in your list: click it to connect your account.
4. Your browser opens the IAJUS login: sign in and click Authorize. The connector searches on your behalf, Lex research stays in your IAJUS account history, and you can disconnect at any time.
5. In the message box, call IAJUS with @ (Connectors → IAJUS) and ask your legal question.
6. Done: the answer carries the IAJUS label and the precedents with each court's official source.

MCP connector

Gemini Spark

gemini.google.com · Spark (beta)

In Gemini Spark, the Gemini agent, connect IAJUS as a custom connected app using the MCP server link, and sign in with your IAJUS account (OAuth 2.1): https://mcp.iajus.com.br/mcp.

1. In Gemini, open Connected apps in the side menu.
2. Go to the custom apps tab and add a custom app link.
3. Paste the link https://mcp.iajus.com.br/mcp and click Next.
4. Read the notice about MCP servers, tick the box accepting the risks and click Connect.
5. Link your Google Account with Continue, so you can use IAJUS on any device.
6. Sign in with your IAJUS account (email and password, or Sign in with Google).
7. Click Authorize. The connector searches on your behalf, Lex research stays in your IAJUS account history, and you can disconnect at any time.
8. Save the app: the IAJUS tools become available in Spark (pesquisar_decisoes, pesquisar_artigos and the others).
9. Done: ask in natural language, for example Use o IAJUS e pesquise os principais entendimentos do STF sobre dosimetria da pena (use IAJUS to search the main STF rulings on sentencing). The answer comes with its grounds and the official source.

Direct channel

WhatsApp

+55 61 4040-4361 · text or voice

IAJUS on WhatsApp answers at the official number +55 61 4040-4361: send your question as text or voice, as in any chat. If your number is not yet a subscriber, IAJUS replies with the link to request access at iajus.com.br/beta (Portuguese), at no cost and with no obligation.

1. Tap the button below (or open wa.me/556140404361): a message is already suggested, so just send it.
2. If you are already a subscriber, the answer arrives with its grounds and the official source. If not, you receive the invitation with the link to request access.
3. Once access is approved, the normal flow applies: ask in natural language and receive the answer with the official source.

PDF of case-law searches: when the answer includes court decisions, IAJUS also sends a PDF with the headnote, the full text and the links of each decision, with a download code valid for 30 days. It is useful to attach to a brief or to keep the research.

Voice works too: you can send your question as a voice message. Your personal data is masked before any processing (LGPD).

Privacy: on WhatsApp, the conversation is kept to build your history. It is linked to your account and you can delete it whenever you want: WhatsApp only, or every channel at once. During the WhatsApp beta, this content is also used to improve the assistant; when the beta ends, it is deleted or anonymized. In the MCP and plugin tools that search the collection, we do not store the full text of your search. Lex research (beta) keeps the conversation in your account: you can resume it for 7 days, and it is kept until you delete it in Studio. Details in the Privacy policy.

Chat on WhatsApp (opens in a new tab; the suggested message is in Portuguese)→

Direct channel

Email

pesquisa@iajus.com.br

Research by email: write your question in natural language to pesquisa@iajus.com.br and receive the answer in the same thread, with the official source. If your address is not yet registered, IAJUS replies with the link to request access.

1. Write to pesquisa@iajus.com.br with your legal question, the way you would ask a colleague.
2. Receive the answer in the same thread, with its grounds and the official link for each source.
3. New address? The first reply already includes the invitation to request access at iajus.com.br/beta (Portuguese).

Write to pesquisa@iajus.com.br

Using another platform? Any client compatible with MCP and OAuth 2.1 connects through the same single address: Cursor, VS Code, Codex CLI, Hermes, OpenClaw, Antigravity, or your own agent or application.

https://mcp.iajus.com.br/mcp

The default authentication is OAuth 2.1: the client opens the login flow at app.iajus.com.br and you sign in with your IAJUS account. Accounts can also use an ik_… key as a Bearer token, a manual alternative to OAuth; treat it like a password. Without authentication, the server refuses the connection on purpose (it answers 401 until you sign in).

For REST API integrations with the same account, talk to the IAJUS team.