How To Connect Claude to LawDiver Tax

What a connector is

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 Tax.

1. 1

   Turn LawDiver Tax on for this chat

   Click + at the lower left, hover Connectors, and switch LawDiver Tax on before you send the question.

2. 2

   Start the message with “Using LawDiver Tax”

   Those words tell Claude to use the Tax connector for this request — not the caselaw connector, and not memory.

3. 3

   Name the kind of authority

   Say Code section, Treas. Reg., Rev. Rul., Tax Court opinion, or treaty. Claude is set up to pick tax_search, tax_retrieve, get_tax_case, get_tax_treaty, or check_tax_authority.

4. 4

   Ask for one job

   Search, or open this section, or check this ruling. A short request is easier for Claude to follow than three jobs in one paragraph.

5. 5

   Tell it to stay with the library

   Add this sentence: “Answer from LawDiver Tax. If LawDiver Tax has no match, say that.”

6. 6

   Look for the lookup

   A real LawDiver Tax answer has a step in the chat where Claude searched or checked something. You may see names like tax_search, tax_retrieve, get_tax_case, get_tax_treaty, or check_tax_authority. An answer with no lookup step came from memory.

7. 7

   Send a correction if it skipped the library

   Reply: “Use the LawDiver Tax connector and show me what it found.” Then ask it to quote the text it retrieved.

Messages you can copy

Paste one of these after LawDiver Tax is on. Change the cite to your own.

Using LawDiver Tax, retrieve IRC § 61 (current edition). Quote from the text LawDiver returns. If LawDiver Tax has no match, say that.

Using LawDiver Tax, is Rev. Rul. 99-7 still good law? Use only what check_tax_authority returns.

Using LawDiver Tax, search Tax Court cases about reasonable compensation for S corporation shareholders. Answer from LawDiver Tax. If there is no match, say that.

Using LawDiver Tax, retrieve the U.S.–Canada income tax treaty and list the articles LawDiver returns.

Claude Code and Desktop

Prefer OAuth on claude.ai when you can. For Claude Code or Claude Desktop config files, use an ld_tax_ key — not a caselaw ld_live_ key.

1. Create a key under Account → API Keys → Tax API.
2. Add a remote MCP server named lawdiver-tax with URL https://lawdiver.com/mcp/tax and header Authorization: Bearer ld_tax_YOUR_KEY.
3. Optional plugin package: lawdiver-tax-claude-plugin.

{
  "mcpServers": {
    "lawdiver-tax": {
      "url": "https://lawdiver.com/mcp/tax",
      "headers": {
        "Authorization": "Bearer ld_tax_YOUR_KEY"
      }
    }
  }
}

Free web research without Claude: lawdiver.com/tax. Sign up: lawdiver.com/signup.

If something goes wrong

I connected caselaw LawDiver instead of Tax

Caselaw is https://lawdiver.com/mcp. Tax is https://lawdiver.com/mcp/tax. Remove the wrong connector or add a second connector with the Tax URL. Tax tools will not appear on the caselaw server.

Claude asks for a client id or secret

Leave Advanced settings empty. LawDiver publishes OAuth discovery. If Claude still fails, remove the connector, add it again with exactly https://lawdiver.com/mcp/tax, and click Connect → Allow.

I clicked Deny

Claude has no access until you connect again and click Allow. Disconnect LawDiver Tax under Customize → Connectors, add it again if needed, and choose Allow.

Claude answered and I do not think it used LawDiver Tax

Look for a lookup step (tax_search, tax_retrieve, get_tax_case, get_tax_treaty, check_tax_authority). If there is none, reply: “Use the LawDiver Tax connector and show me what it found.” Keep LawDiver Tax switched on for that chat.

Claude Code rejects my key

Tax MCP requires an ld_tax_ key. Caselaw ld_live_ keys are rejected. Mint a Tax key under Account → API Keys.

Connect spins or times out

Confirm the address is exactly https://lawdiver.com/mcp/tax. Remove the connector, add it again, and click Connect. Advanced settings stay empty.

Still stuck? Email [email protected] and include the Claude plan you are on and the sentence Claude showed you.

Questions

Is LawDiver Tax the same connector as caselaw LawDiver?

No. Caselaw LawDiver lives at https://lawdiver.com/mcp. Tax is a separate MCP server at https://lawdiver.com/mcp/tax with five tax tools. Connect Tax from its own Claude directory listing. Do not point Claude at the caselaw connector and expect IRC or Rev. Rul. tools.

Do I paste an API key into Claude.ai?

No. On claude.ai you open LawDiver Tax in the Claude directory, sign in to LawDiver, and click Allow. Leave Advanced settings empty. An ld_tax_ key is for Claude Code, Desktop config, Cursor, and other header-based clients.

Which Claude plan do I need?

Connectors work on Claude Free, Pro, Max, Team, and Enterprise. On Team and Enterprise, an Owner adds LawDiver Tax for the organization first. Each person then clicks Connect and signs in to their own LawDiver account.

Can LawDiver Tax change my files or file something with the IRS?

LawDiver Tax only reads. It searches primary sources, opens documents, and checks guidance status. It does not edit the library, edit your returns, send email, or file anything.

What does “No adverse action found” mean?

When you check a revenue ruling, procedure, or notice, LawDiver reports what the IRS sources it holds show. “No adverse action found” means those sources show no adverse action — it is not a guarantee that the guidance is good forever. Read the return and confirm anything you will rely on.

Is LawDiver Tax free?

The LawDiver Tax connector is free during the current rollout. Your Claude subscription is separate and is billed by Anthropic.