Marian

com.marianmortgagePublished by marianmortgage.comOfficial publisherv0.2.0Updated Nov 7, 2026

A planned US home mortgage whose interest rate can only go down. Pre-launch; not lending yet.

VerifiedStreamable HTTPWeb executableFinanceBusiness & Commerce

Overview

AI-generated overview

Marian's remote MCP server explains a planned US mortgage whose rate can only go down, compares it to refinancing, and collects waitlist signups.

What you can do
  • Explain Marian's published product facts: pre-launch status, how the down-only rate works, who it is not a fit for, and brand copy
  • Compare Marian's automatic rate resets with a standard fixed-rate mortgage that is refinanced, in qualitative terms only
  • Add a user's email and optional ZIP code to the Marian waitlist when the user explicitly asks to join
When to use it
Useful when a user asks about Marian, down-only or rate-reset mortgages, or how such a product compares with refinancing, and wants to join the waitlist. It is a product-information and lead-capture tool, not a lending or rate-quote service.
Requirements
A remote streamable HTTP endpoint at mcp.marianmortgage.com; no packages, environment variables or headers are declared. The waitlist tool needs the user's email address and, optionally, a ZIP code.
Before you install
Marian is pre-launch, not lending in any state and not offering credit; no rates, payments or dollar figures are published, so nothing it returns is a quote or offer. join_waitlist sends the user's email and optional ZIP code to Marian and should only be called with explicit consent (user_consent: true); joining is not a credit application.

Installation

In SourceWeft

  1. Open Marian in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/com.marianmortgage%2Fmcp/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "marian": {
      "type": "http",
      "url": "https://mcp.marianmortgage.com/mcp"
    }
  }
}

Tools

3

explain_marian

Explain Marian

Returns Marian's published product facts: status (pre-launch, not lending in any state, not offering credit), how the down-only rate works, who it is not a fit for, and the brand line and product description. Same data as https://marianmortgage.com/agents.json. Values that have not been published are null.

Takes no parameters.

compare_to_refinancing

Compare to refinancing

Describes, in qualitative terms, how Marian's automatic rate resets compare with a standard fixed-rate mortgage that the borrower refinances, given the borrower's situation. Returns no rates, payments or dollar figures, because Marian has not published its rates or terms. Marian is pre-launch and not lending in any state. For model estimates for hypothetical designs, see the open-source proof-engine model and its README: https://github.com/MarianMortgage/proof-engine#readme.

Parametersbalancerequiredcurrent_raterequiredhorizon_yearsrequiredrefinance_behaviorrequired

join_waitlist

Join the Marian waitlist

Adds the user's email (and optional ZIP code) to the Marian waitlist. Only call this when the user has explicitly asked to join, and pass user_consent: true to confirm that. Joining the waitlist isn't an application for credit.

Parameterszipemailrequireduser_consentrequired

Version history

1
  1. v0.2.0LatestNov 7, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.