Claude
How To Connect Claude to LawDiver
Install LawDiver in Claude in six clicks. Then Claude can search real cases, open the interactive case and statute viewer, and check a citation while you chat.
Installation, one click at a time
- 1
Open Claude in a web browser
Go to claude.ai and sign in. Use a computer for this first connection. After it works, the same Claude account can use LawDiver on the desktop app and, once connected, on the phone.
- 2
Open LawDiver in Claude’s directory
LawDiver is already listed. Open https://claude.ai/directory/lawdiver-com and click Connect (it may say Install).
- 3
Sign in to LawDiver
Claude sends you to LawDiver. Sign in with the email and password for your LawDiver account. If you do not have one yet, create it on that screen. Claude never sees your password.
- 4
Click Allow
LawDiver asks whether this Claude account may search cases, open the case and statute viewer, and check citations for you. Click Allow. If you click Deny, Claude stays disconnected until you connect again and click Allow.
- 5
Turn LawDiver on in the chat
Start a new chat. At the lower left of the message box, click the + button. Hover over Connectors. Turn LawDiver on. A connector that is connected in settings still has to be on for that chat.
- 6
Send one test message
Paste: Using LawDiver, is Chevron still good law? Claude should look it up before it answers. You will see a lookup step (often view_case or get_good_law), and on Claude web or desktop the interactive case viewer can open.
Directory page: https://claude.ai/directory/lawdiver-com
If you do not see a Connect button
Add LawDiver by hand. Leave Advanced settings empty. Do not type a client id, a secret, or an API key.
- In Claude, click Customize on the left sidebar.
- Click Connectors.
- Click the + button, then Add custom connector.
- Name: LawDiver
- Server address: https://lawdiver.com/mcp
- Click Add.
- Click Connect, sign in to LawDiver, and click Allow.
- In a chat, click +, hover Connectors, and turn LawDiver on.
Work or school Claude (Team or Enterprise)
On those plans, only an Owner can add a connector for the organization. Ask them to open Organization settings, then Connectors, then Add, then Custom, then Web, and enter https://lawdiver.com/mcp. After they add it, you open Customize, then Connectors, find LawDiver, click Connect, and sign in with your own LawDiver account.
What a connector is
Claude is the assistant you type to. LawDiver is a library of U.S. court opinions, statutes, and citation checks. A connector joins them. The technical name for that plug is MCP (Model Context Protocol). You connect once. After that, Claude can look something up in the library in the middle of a chat.
A citation Claude remembers can look perfect and still be wrong. With LawDiver connected, you can tell Claude to search the library, open the case or statute in the interactive viewer, and quote what it found. Every hit includes the case name, citation, court, and date, and a link so you can read it yourself.
LawDiver only reads. It searches, opens text in the viewer, and checks citations. It does not edit the library, edit your files, or file anything with a court.
What you can ask Claude to do
These are the jobs LawDiver gives Claude. Ask in plain English. Claude picks the lookup. If the library has no match, Claude should say so.
Search for cases
Ask for cases on an issue, in a court you name: one state, one federal circuit, all federal courts, or the U.S. Supreme Court. Claude gets the case name, citation, court, date, a short passage, and a good-law flag when the library has one.
Open a case in the viewer
Ask Claude to open or show a case (view_case). On Claude web and desktop, LawDiver opens an interactive viewer with the opinion, good-law badge, negative treatment, and Cited by. For quotes in the chat, Claude can still pull opinion text separately.
Open a statute, regulation, or court rule
Ask Claude to open a section such as 42 U.S.C. § 1983 or Fed. R. Civ. P. 12 (view_authority). The same viewer shows the text, edition, neighbouring sections or rules, and cases that cite it. If the section is missing from the library, Claude should say it was not found.
Check whether a citation is real
Paste a citation, or a list of them. Claude checks each one against the LawDiver library and tells you whether it matched. A miss stays a miss. Claude should not swap in a different cite.
Ask if a case is still good law
For a matched case, Claude can report good-law and negative-treatment signals when LawDiver has them — and open the case in the viewer so you can see the overruled or reversed badge yourself. Read the signal and the opinion. This is a database check, and you still confirm anything you will cite.
Check a tax citation
The same citation check covers specialty forms the library holds, such as revenue rulings and private letter rulings. A hit comes back as that authority. It is a different record from a court opinion.
Case and statute viewer
On Claude web and desktop, view_case and view_authority open LawDiver inside the chat: opinion or section text, good-law status, Cited by, neighbouring statutes or rules, and a Back control. Ask in plain English — for example, “Is Chevron still good law?”
How to get the answer you want
Claude can still answer from memory if you leave the request loose. These habits keep it on LawDiver.
- 1
Turn LawDiver on for this chat
Click + at the lower left, hover Connectors, and switch LawDiver on before you send the question.
- 2
Start the message with “Using LawDiver”
Those two words tell Claude to use the connector for this request.
- 3
Name the court
For a case search, say the place: “California state courts,” “the Ninth Circuit,” “all federal courts,” or “the U.S. Supreme Court.” Claude is set up to ask you once if you leave the court out, instead of searching the whole country.
- 4
Ask for one job
Search, or open this case, or check this citation. A short request is easier for Claude to follow than three jobs in one paragraph.
- 5
Tell it to stay with the library
Add this sentence: “Answer from LawDiver. If LawDiver has no match, say that.”
- 6
Look for the lookup
A real LawDiver answer has a step in the chat where Claude searched or checked something. You may see names like search_cases, view_case, view_authority, check_citation, get_opinion_text, retrieve_statute, or get_good_law. An answer with no lookup step came from memory.
- 7
Send a correction if it skipped the library
Reply: “Use the LawDiver connector and show me what it found.” Then ask it to open the case or statute in the viewer, or to quote the opinion or statute it retrieved.
Messages you can copy
Paste one of these after LawDiver is on. Change the court or the citation to your own.
Search cases
Using LawDiver, search California state cases about comparative negligence. Answer from LawDiver. If LawDiver has no match, say that.
Open a case in the viewer (good law)
Using LawDiver, is Chevron still good law? Open the case in the viewer and show the negative treatment LawDiver reports.
Check a citation and good law
Using LawDiver, is 347 U.S. 483 a real case, and is it still good law? Use only what LawDiver returns.
Open a statute in the viewer
Using LawDiver, open 42 U.S.C. § 1983 and show me cases that cite it.
If something goes wrong
- I cannot find Connectors
- On claude.ai, Customize is on the left sidebar, and Connectors is inside it. Do this in a web browser on a computer. The phone app is easier after the connector is already on your account.
- The + menu has no way to add LawDiver
- That usually means a Team or Enterprise account. An Owner adds the connector under Organization settings, then you click Connect on your own account. The address they enter is https://lawdiver.com/mcp.
- I signed in and Claude still cannot use LawDiver
- Go back to Customize, then Connectors, open LawDiver, and click Connect again. On the LawDiver screen, click Allow. Then start a new chat and turn LawDiver on under the + menu.
- I clicked Deny
- Claude has no access until you connect again and click Allow. Disconnect LawDiver under Customize, then Connectors, add it again if needed, and choose Allow.
- Claude answered and I do not think it used LawDiver
- Look for a lookup step in the reply. If there is none, the answer came from memory. Reply: “Use the LawDiver connector and show me what it found.” Keep LawDiver switched on for that chat.
- Claude cited a case I cannot find
- Reply: “Check that citation with LawDiver.” A library hit includes the case name, citation, court, and date. If LawDiver reports no match, treat the citation as unverified.
- Connect spins or times out
- Confirm the address is exactly https://lawdiver.com/mcp, with no extra words or spaces. Remove the connector, add it again, and click Connect. Advanced settings stay empty.
- The welcome email is confusing
- Connecting Claude creates a LawDiver account automatically. You do not have to open that email to use the MCP or the standard features on the website. Activate only if you want advanced features on the web. This page is the connection guide.
Still stuck? Email [email protected] and include the Claude plan you are on (Free, Pro, Team, or Enterprise) and the sentence Claude showed you.
Questions
- What is MCP?
- MCP stands for Model Context Protocol. It is the plug that lets Claude look things up in another service while you chat. LawDiver is the law library on the other end of that plug. You do not install software. You connect once, then Claude can search the library when you ask.
- Do I have to open the email LawDiver sent me?
- Connecting Claude creates a LawDiver account automatically. You do not have to open that email to use the MCP or the standard features on the website. The Activate button only unlocks advanced features on the web. The other button opens the instructions on this page.
- Do I paste an API key into Claude?
- No. On claude.ai you sign in to LawDiver and click Allow. Leave Advanced settings empty. An API key is for other tools, such as Cursor, and it stays in those tools.
- Which Claude plan do I need?
- Connectors work on Claude Free, Pro, Max, Team, and Enterprise. A Free plan can add one custom connector. On Team and Enterprise, an Owner adds LawDiver for the organization first. Each person then clicks Connect and signs in to their own LawDiver account.
- Can LawDiver change my files or file something in court?
- LawDiver only reads. It searches cases, opens opinions and statute text in the viewer, and checks citations. It does not edit the law library, edit your documents, send email, or file anything.
- What are view_case and view_authority?
- They open LawDiver’s interactive viewer inside Claude (web and desktop). view_case shows the opinion, good-law badge, negative treatment, and Cited by. view_authority opens a statute, regulation, court rule, or constitutional provision with the text, neighbouring sections, and cases that cite it. Ask Claude to open or show a case or section; it picks the tool.
- What does “good law” mean here?
- When you ask whether a case is still good law, Claude asks LawDiver for treatment signals the database has for that case, including negative treatment when it is recorded. That is a check against this library. Read the signal, open the opinion in the viewer, and confirm anything you will rely on.
- Is LawDiver free?
- The LawDiver connector is free during the current rollout. Your Claude subscription is separate and is billed by Anthropic.
Ready when the connector is on
Open LawDiver in Claude, click Connect, click Allow, then turn it on in the chat.