@urbankitstudio/mcp-atlas

Query the verified parcel ArcGIS REST endpoints of 227 counties across all 50 US states (241 layers) for owner, APN and address lookup via the Model Context Protocol (MCP).

An MCP server that gives AI assistants direct access to UrbanKit Studio's atlas of manually verified county parcel GIS services. Ask Claude or Cursor to find the ArcGIS REST endpoint for any covered county, get the exact owner-search query URL, and look up parcel data — without needing to know anything about ArcGIS REST API conventions.

Coverage: 227 counties across all 50 US states, 241 verified endpoints (atlas 0.6.5).

Quick start

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

config.json

{
  "mcpServers": {
    "mcp-atlas": {
      "command": "npx",
      "args": ["-y", "@urbankitstudio/mcp-atlas"]
    }
  }
}

Cursor

Add to .cursor/mcp.json in your project root (or ~/.cursor/mcp.json globally):

config.json

{
  "mcpServers": {
    "mcp-atlas": {
      "command": "npx",
      "args": ["-y", "@urbankitstudio/mcp-atlas"]
    }
  }
}

Install globally (optional)

Terminal

npm install -g @urbankitstudio/mcp-atlas

Then use mcp-atlas as the command instead of npx -y @urbankitstudio/mcp-atlas.

Tools

The four tools are one pipeline, and what separates them is how precisely you can already name the county:

You have	Use	You get
A state, or nothing	`list_counties`	Which counties are covered, and whether owner search works there. No URLs.
A vague, misspelled or FIPS reference	`find_county`	Every county that reference matches, named, each with its record
An exact state and county	`get_parcel_endpoint`	That one county's endpoint URL, layer, fields and sample query
A county and an owner's name	`build_owner_query`	A runnable URL that searches for that name

find_county and get_parcel_endpoint return the same per-county record. They differ in how you address the county: find_county accepts an uncertain reference and may come back with several candidates, get_parcel_endpoint takes an exact pair and answers about one. If you already know the county, skip find_county.

This server never executes a query and returns no parcel records. It tells you the URL to fetch; fetching it is yours to do.

`list_counties`

Browse coverage. Answers "is this county covered?" and "what can I search there?" — one line per county, with no endpoint URLs or field names.

Parameter	Type	Required	Description
`state`	string	No	Two-letter abbreviation (`IL`) or full name (`Illinois`)

Example prompt: "List all covered counties in Illinois"

Example output:

Code

ST | County               | Slug                     | Coverage
--------------------------------------------------------------------
IL | Kane                 | kane-county              | owner+APN
IL | Cook                 | cook-county              | APN only
IL | DuPage               | dupage-county            | owner+APN
...

`find_county`

Resolves a reference you cannot state exactly. Fuzzy-matches a partial or misspelled name, a "County State" phrase, or a 5-digit FIPS code against every covered county, and names each county it matched so an ambiguous reference comes back as a list to choose from. Each match carries that county's record: endpoint URLs, searchable field names, owner field, sample query, license.

Parameter	Type	Required	Description
`query`	string	Yes	County name (`Kane`), name+state (`Kane IL`), or FIPS (`17089`)

Example prompt: "Find the parcel endpoint for Kane County Illinois"

`get_parcel_endpoint`

The default lookup once the county is known. Returns the full ArcGIS REST URL, layer index, searchable fields, owner field, a generic sample ?where=…&f=json query and the UrbanKit deep-link for one county. For a named owner, use build_owner_query rather than editing the sample query by hand.

Parameter	Type	Required	Description
`state`	string	Yes	Two-letter abbreviation or full name
`county`	string	Yes	County name (`Kane` or `Kane County`)

Example prompt: "Give me the ArcGIS REST endpoint for Cook County Illinois"

`build_owner_query`

The only tool that searches for a named owner. Fills a person or company name into the county's verified owner/taxpayer field as UPPER(field) LIKE UPPER('%NAME%'), a case-insensitive partial match, and returns a URL you can fetch or open. A county that publishes no owner name is refused here, with the reason, rather than handed a query that finds nothing.

Parameter	Type	Required	Description
`state`	string	Yes	Two-letter abbreviation or full name
`county`	string	Yes	County name
`owner_name`	string	Yes	Owner/taxpayer name (partial match)

Example prompt: "Build an ArcGIS query for properties owned by 'Smith' in Kane County IL"

Example output:

Code

County:       Kane, Illinois
Owner field:  TaxName
WHERE clause: UPPER(TaxName) LIKE UPPER('%SMITH%')

Query URL:
https://gistech.countyofkane.org/arcgis/rest/services/KanePINList/MapServer/0/query
  ?where=UPPER(TaxName)%20LIKE%20UPPER('%25SMITH%25')
  &outFields=PIN,TaxName,SiteAddress,SiteCity,MailingAddress
  &returnGeometry=false&f=json&resultRecordCount=25

Example conversation

User: I'm doing due diligence on properties in Kane County, Illinois. Can you find all parcels owned by "Blackstone"?

Claude (using mcp-atlas):

Calls get_parcel_endpoint → gets the gistech.countyofkane.org URL and confirms the owner field is TaxName

Calls build_owner_query with owner_name=Blackstone → returns a ready fetch URL

Optionally fetches the URL and formats the parcel results

Atlas coverage

The atlas is maintained by UrbanKit Studio. All endpoints are manually verified. Counties with an owner/taxpayer field support full name-based lookups; PIN-only counties support APN/parcel-number queries.

Full coverage map: https://urbankitstudio.com/parcel-atlas

Data

Atlas data is embedded in the package (no network calls at startup). The underlying @urbankitstudio/atlas SDK is also published separately for programmatic use.

What Socket flags, and how much of it is ours

Socket's supply-chain scanner rates this package in the mid-70s. Clicking through shows a long alert list. Each alert, checked rather than waved away:

Alert	Whose	What it is
`usesEval`	Not ours	No `eval` or `new Function` anywhere in `src/`. It comes from a dependency.
`unmaintained` (21)	Not ours	Transitive dependencies last published 2017–2021.
`mixedLicense`	Not ours	A dependency published as `BSD-3-Clause AND ISC`.
`noTests`	Ours, by design	`files` ships `dist` only. The suite lives in `test/` and runs in CI. Shipping tests inside the tarball would be the defect.
`networkAccess`, `filesystemAccess`, `envVars`, `shellAccess`	Ours	An MCP server talks to a client over stdio and reads its own config. A server without these could not do the job.
`unpopularPackage`, `noV1`	Ours	Download count and a `0.x` version. Both resolve with time, neither is a code issue.

Vulnerability and license both come back at 100, quality at 99. The number the badge shows is the supply-chain sub-score, and its single largest deduction is download count, a popularity measure wearing a security badge's clothes. Judge the list above, not the digit.

The four access alerts are what let the server read its own config and talk to a client over stdio, nothing more. It still never executes a query or returns a parcel record.