Mcp Atlas

io.github.urbankitstudiov0.2.22Updated Oct 10, 2026

Owner and APN lookup across 286 US counties (297 ArcGIS endpoints). No API key needed.

VerifiedSTDIODesktop onlyLocation & Lifestyle Data & Analytics

Overview

AI-generated overview

Looks up US county parcel GIS endpoints and builds ArcGIS owner-search query URLs for 286 counties.

What it does: Provides four tools over an embedded atlas of 286 US counties and 297 ArcGIS REST endpoints. list_counties shows which counties are covered and whether owner search works there; find_county fuzzy-matches a partial name, phrase or FIPS code; get_parcel_endpoint returns one county's endpoint URL, layer, searchable fields and sample query; build_owner_query returns a runnable URL that searches a county's owner/taxpayer field for a partial name. It never executes a query or returns parcel records — it only tells you which URL to fetch.
When to use it: Useful when you need to locate the right county parcel GIS service or construct an owner or parcel-number search URL without knowing ArcGIS REST conventions. Suited to property due diligence, ownership research and parcel data work where you already know or can name a US county.
Requirements: Runs locally over stdio, typically via npx @urbankitstudio/mcp-atlas or a global npm install, so Node.js and npm are needed. No API key, account, environment variable or header is declared. Atlas data is embedded in the package, so no network call is made at startup; fetching the returned query URLs requires network access.

Before you install

The server only produces query URLs; fetching them is left to the assistant or user, and the resulting requests go to third-party county ArcGIS services. Owner-name searches return property ownership information, which is sensitive personal data. The README notes a supply-chain scanner flags the package for eval use, unmaintained transitive dependencies, a mixed license, network, filesystem, environment-variable and shell access, and low download count; the author attributes most of these to…

Installation

In SourceWeft

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

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

[Socket Badge]

@urbankitstudio/mcp-atlas

[mcp-atlas MCP server]

Query the parcel ArcGIS REST endpoints of 286 counties across 51 US states (50 states plus DC), 297 endpoints total, 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: 286 counties across 51 US states (50 states plus DC), 297 endpoints, 296 of them live (atlas 0.6.25).

Quick start

Claude Desktop

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

json

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

{  "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):

json

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

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

Install globally (optional)

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.

Example prompt: "List all covered counties in Illinois"

Example output:

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

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

What each Coverage label promises:

Label	Meaning
`owner+APN`	`build_owner_query` returns a URL for at least one endpoint
`APN only (county publishes no owner name)`	A reviewed record says the county serves no usable owner name
`location queries only`	No endpoint answers attribute searches; parcels are reached by geometry, which also returns owner fields
`APN only (owner column not searchable)`	An owner column exists but the county marks it unsearchable by name; a parcel-id or location query returns it
`APN only`	No endpoint documents an owner column

`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.

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 (or why no owner query is offered), the county's Scope: predicate when the layer is shared statewide or regionally, 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.

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. On a shared statewide or regional layer (Connecticut's regional composites, for example) the county's scope predicate is ANDed in front, as (scope) AND UPPER(field) LIKE …, so only that county's rows come back.

An endpoint is refused, with the reason, rather than handed a query that finds nothing or hangs:

a reviewed record says the county publishes no usable owner name;
the layer serves no attribute search at all (query it by location instead);
the owner column is not searchable by name (use a parcel-id or location query).

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

Example output:

County:       Kane, IllinoisOwner field:  TaxNameWHERE 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

County:       Kane, IllinoisOwner field:  TaxNameWHERE 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.

License

Source: README.md at commit 7be3e34

Tools

Tool metadata has not been indexed yet.

Version history

v0.2.22LatestOct 10, 2026

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

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)

Mcp Atlas

Overview

Installation

In SourceWeft

Other MCP clients

README

@urbankitstudio/mcp-atlas

Quick start

Claude Desktop

Cursor

Install globally (optional)

Tools

list_counties

find_county

get_parcel_endpoint

build_owner_query

Example conversation

Atlas coverage

Data

What Socket flags, and how much of it is ours

License

Tools

Version history

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