leaseclear-mcp

leaseclear-mcp

A Model Context Protocol server that exposes LeaseClear lease Q&A.

Listed in the official MCP Registry as io.github.amadeuserras/leaseclear-mcp.

Tools

• lease_qa — ask one question about lease terms; returns an answer grounded in the lease, or states that the lease is silent

Usage

Add this to your MCP client config (e.g. claude_desktop_config.json or Cursor mcp.json):

{
  "mcpServers": {
    "lease-qa": {
      "command": "uvx",
      "args": ["leaseclear-mcp"]
    }
  }
}

The package is on PyPI. uvx fetches and runs it as a local subprocess, communicating over stdio. uv required.

Optional environment variables

Variable	Description	Default
LEASECLEAR_API_KEY	Use the server with your own LeaseClear account	LeaseClear demo mode
LEASECLEAR_API_URL	Override the API endpoint (local or private instances)	LeaseClear production backend

{
  "mcpServers": {
    "lease-qa": {
      "command": "uvx",
      "args": ["leaseclear-mcp"],
      "env": {
        "LEASECLEAR_API_KEY": "lc_...",
        "LEASECLEAR_API_URL": "https://..."
      }
    }
  }
}

lease_qa usage

Argument

• question (string, required) — one question about the lease

_meta

• document_ids (string[], optional) — UUIDs of the documents to query. Omitted means all.

Security: The _meta field is used to pass metadata to the tool call that the model doesn't see. Having document_ids there is intentional: it prevents cross-document prompt injection because the model is never able to choose which documents it has access to. See a real-world example in LeaseOps: prompt injection and the tenants table.

MCP Python SDK example

Tool call:

result = await session.call_tool(
    name="lease_qa",
    arguments={
        "question": "How much is the security deposit for Yuna Kim?"
    },
    meta={
        "document_ids": [
            "a1b2c3d4-e5f..."
        ]
    }
)

Output:

{
  "answer": "The security deposit is $6,400.00. This deposit is held in Owner's Broker's trust account [california-johnson-kim §4]."
}

Tech stack

• Python 3.12
• Model Context Protocol Python SDK (mcp[cli]) over stdio
• httpx for LeaseClear API calls
• Pydantic and pydantic-settings for schemas and config
• uv and uv_build for running and packaging
• pytest, Ruff, and Pyright for tests, linting, and type checking

Project structure

leaseclear-mcp/
├── src/leaseclear_mcp/
│   ├── server.py        # MCP server + lease_qa
│   ├── leaseclear.py    # LeaseClear HTTP client
│   ├── schemas.py
│   └── config.py
├── tests/
├── pyproject.toml
├── .env.example
└── README.md

Local Development

git clone https://github.com/you/leaseclear-mcp.git
cd leaseclear-mcp
uv sync
cp .env.example .env
uv run pytest
uv run ruff check .
uv run pyright

Debugging

Use the MCP Inspector to test the server interactively:

npx @modelcontextprotocol/inspector uvx leaseclear-mcp

From a checkout, use uv run leaseclear-mcp instead of uvx leaseclear-mcp.

License

MIT