@urbankitstudio/mcp-atlas

Query the verified parcel ArcGIS REST endpoints of 171 counties across all 50 US states (174 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: 171 counties across all 50 US states, 174 verified endpoints (atlas 0.6.2).

Quick start

Claude Desktop

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

{
  "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):

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

Install globally (optional)

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 youcan 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. Theydiffer in how you address the county: find_county accepts an uncertainreference and may come back with several candidates, get_parcel_endpointtakes an exact pair and answers about one. If you already know the county, skipfind_county.

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

`list_counties`

Browse coverage. Answers "is this county covered?" and "what can I searchthere?" — 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:

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 ormisspelled name, a "County State" phrase, or a 5-digit FIPS code against everycovered county, and names each county it matched so an ambiguous referencecomes 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=jsonquery and the UrbanKit deep-link for one county. For a named owner, usebuild_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 nameinto the county's verified owner/taxpayer field asUPPER(field) LIKE UPPER('%NAME%'), a case-insensitive partial match, andreturns a URL you can fetch or open. A county that publishes no owner name isrefused 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:

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 scannerrates 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 thebadge shows is the supply-chain sub-score, and its single largest deduction is downloadcount, a popularity measure wearing a security badge's clothes. Judge the list above, notthe digit.

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

@urbankitstudio/mcp-atlas