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For AI agents

LandlordOS for AI agents.

Connect ChatGPT, Claude or any MCP client to LandlordOS and your assistant can work on your portfolio, with your say-so. UK landlord law tools are open to everyone, no account needed.

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What it is

LandlordOS and Ace.

LandlordOS is a property management and accounting platform for UK self-managing landlords. Ace is the AI agent inside it: you tell Ace what happened and it keeps the properties, tenancies, compliance, rent and tax records up to date.

LandlordOS runs an MCP server, so your own AI assistant can use the same tools Ace uses. A landlord signs in, approves the app, and then asks their assistant about their own portfolio. After sign-in, Ace is also at landlord-os.com/chat.

LandlordOS is built in the UK, and a property can be anywhere. England, Wales, Scotland and Northern Ireland each get their own rules, and Ace has country notes for Jordan, the UAE (Dubai), Nepal and Guernsey so far. For any other country Ace tracks rent, documents, tasks and maintenance and says plainly that it cannot advise on local law, so do not fill the gap with a guess. Each property has its own currency and money is never converted or mixed. The UK tax tools cover UK property only.

Connect

Connect your AI assistant.

The MCP server endpoint is https://landlord-os.com/api/mcp. It uses Streamable HTTP, stateless, with JSON responses (protocol version 2025-06-18). Authentication is OAuth 2.1 with dynamic client registration and PKCE. You sign in with your normal LandlordOS account and approve the app on a LandlordOS consent screen. You need a LandlordOS account first: sign up free or log in.

ChatGPT

The LandlordOS plugin is submitted to the ChatGPT plugin directory and is pending review. Until it is listed, add it as a custom MCP server.

  1. In ChatGPT, open Plugins, click Add, then Create custom MCP server.
  2. Name it LandlordOS and paste https://landlord-os.com/api/mcp. Keep Authentication on OAuth.
  3. Tick the box, click Create, then Continue to LandlordOS.
  4. Sign in to LandlordOS and click Approve.

On some plans custom servers need Developer mode, under Settings, Security and login.

Claude

Works in claude.ai, Claude Desktop and Claude Code.

  1. Open Customize, then Connectors, click Add, then Add custom connector.
  2. Name it LandlordOS, paste https://landlord-os.com/api/mcp and click Continue.
  3. Choose Sign in now and Register automatically, then click Add and Connect.
  4. Sign in to LandlordOS and click Approve.

In Claude Code, run this instead:

claude mcp add --transport http landlordos https://landlord-os.com/api/mcp

Other MCP clients

Point the client at https://landlord-os.com/api/mcp. It discovers OAuth from the WWW-Authenticate header on the 401 response, then the protected resource metadata at /.well-known/oauth-protected-resource. Scopes are email and profile. The machine-readable server card is at /mcp.json.

What it can do

Read, write, and ask first.

  • Signed in: the full set of Ace tools, about 100, covering properties, tenants, tenancies, compliance, rent and arrears, transactions, tax estimates, MTD status, maintenance, tasks, documents, inspections, inventories, keys, contractors, the landlord inbox and settings.
  • Writes ask first: tools that change anything ask the user before they act.
  • No sign-in needed: these public tools work for anyone: calculate_notice_period, calculate_rental_yield, calculate_section24, lookup_compliance_requirements, lookup_legal_fact, list_knowledge_topics, lookup_knowledge and search_help_articles.

There is also a public conversational agent (A2A) at https://landlord-os.com/api/agent, with its card at /.well-known/agent.json. It answers questions but has no access to any portfolio.

For agents reading this page

What to do, in order.

  1. To act on a landlord's portfolio, connect the MCP server at https://landlord-os.com/api/mcp and let the user sign in. Do not ask the user for their password.
  2. To answer a UK landlord law question without an account, call the public tools above, or read /llms.txt.
  3. To help a human get started, send them to https://landlord-os.com/signup. Existing users log in at https://landlord-os.com/login.
  4. Before any write, confirm with the user what will change.
Discovery files

Where everything is.

FileWhat it is
/llms.txtShort summary of LandlordOS for AI models
/llms-full.txtExtended content for ingestion
/context.mdDeeper agent context document
/mcp.jsonMCP server card, generated live from the server
/.well-known/oauth-protected-resourceOAuth protected resource metadata for the MCP server
/.well-known/agent.jsonA2A agent card for the public conversational agent
/for-agents.mdThis page as Markdown
Privacy

Your data, your say.

A connected app only sees the signed-in landlord's own data. You can disconnect any app at any time in Settings, Connected apps.

Start with a LandlordOS account.

Sign up, add a property, then connect your assistant.

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