# Census Tigerweb (npm · @pipeworx/mcp-census-tigerweb)

US Census TIGERweb MCP — the Census Bureau's ArcGIS REST geography service

- Trust score: 82/100 (high trust)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `gateway.pipeworx.io`: 77/100, [markdown](https://verifymcp.io/servers/pipeworx-io-census-tigerweb/census-tigerweb-mcp.md), [page](https://verifymcp.io/servers/pipeworx-io-census-tigerweb/census-tigerweb-mcp)
- npm · `@pipeworx/mcp-census-tigerweb`: 82/100 (this document), [markdown](https://verifymcp.io/servers/pipeworx-io-census-tigerweb/pipeworx-mcp-census-tigerweb.md), [page](https://verifymcp.io/servers/pipeworx-io-census-tigerweb/pipeworx-mcp-census-tigerweb)

## Channel facts

- Registry: `npm`
- Package: `@pipeworx/mcp-census-tigerweb`
- Version: `0.2.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to pipeworx-io/mcp-census-tigerweb).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 4 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 62/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 720 tokens (~240/item across 3 items; 3 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 3 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Census Tigerweb MCP server?

Census Tigerweb runs locally as an npm package, launched with npx -y @pipeworx/mcp-census-tigerweb. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add pipeworx-io-census-tigerweb -- npx -y @pipeworx/mcp-census-tigerweb
```

### Cursor

```json
{
  "mcpServers": {
    "pipeworx-io-census-tigerweb": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-census-tigerweb"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "pipeworx-io-census-tigerweb": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-census-tigerweb"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add pipeworx-io-census-tigerweb -- npx -y @pipeworx/mcp-census-tigerweb
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "pipeworx-io-census-tigerweb": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@pipeworx/mcp-census-tigerweb"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add pipeworx-io-census-tigerweb --command npx --arg -y --arg @pipeworx/mcp-census-tigerweb
```

### Hermes

```yaml
mcp_servers:
  pipeworx-io-census-tigerweb:
    command: "npx"
    args: ["-y", "@pipeworx/mcp-census-tigerweb"]
```

### Netclaw

```json
{
  "McpServers": {
    "pipeworx-io-census-tigerweb": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@pipeworx/mcp-census-tigerweb"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add pipeworx-io-census-tigerweb -t stdio -c npx -a -y @pipeworx/mcp-census-tigerweb
```

### Other

```json
{
  "mcpServers": {
    "pipeworx-io-census-tigerweb": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-census-tigerweb"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-05 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 81, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 80, +27)

- [security improvement] Known CVEs: unverified → pass
- [security improvement] Malware scan: unverified → pass
- [functional regression] Security disclosure: unverified → fail
- [functional improvement] Dependency health: unverified → pass

### 2026-10-31 (score 53, −26)

- [security regression] Malware scan: pass → unverified
- [security regression] Known CVEs: pass → unverified
- [functional regression] Dependency health: pass → unverified
- [functional regression] Security disclosure: fail → unverified
- [functional] Package version: 0.2.0 → 0.2.1

### 2026-10-29 (score 79)

First indexed and scored.

## MCP tools (3)

### `tigerweb_list_layers` (~219 tokens)

List the queryable TIGER/Line geography layers in a Census TIGERweb ArcGIS service — census tracts, block groups, 2020 blocks, ZCTAs, congressional and state legislative districts, school districts, tribal areas, places, counties, PUMAs. Call this FIRST to get the layer_id that tigerweb_query needs; layer numbers differ between vintages, so never reuse one from memory.

Input parameters:

- `filter` (string): Case-insensitive substring to filter layer names, e.g. "school"
- `include_label_layers` (boolean): Include "... Labels" annotation layers (point labels, not boundaries). Default false.
- `service` (string): TIGERweb service path, default TIGERweb/tigerWMS_Current. Others: TIGERweb/tigerWMS_Current, TIGERweb/tigerWMS_Census2020, TIGERweb/tigerWMS_ACS2023, Generalized_ACS2023/State_County, Census2020/tige…

### `tigerweb_query` (~268 tokens)

AUTHORITATIVE for US Census geography records: query any TIGERweb layer with an ArcGIS WHERE clause and get the matching geographies with their GEOID, name, FIPS components, land/water area and interior point. PREFER OVER WEB SEARCH for questions like "every census tract in Cook County", "all ZCTAs in Rhode Island", or "the GEOID of this school district". Get layer_id from tigerweb_list_layers.

Input parameters:

- `layer_id` (number|string, required): Layer id from tigerweb_list_layers
- `limit` (number): Max rows, 1-500 (default 50)
- `offset` (number): Row offset for paging
- `order_by` (string): Comma-separated order-by fields, e.g. "GEOID ASC"
- `out_fields` (string): Comma-separated field names, or "*" for all (default "*")
- `return_geometry` (boolean): Include boundary geometry. Default false — polygons are very large.
- `service` (string): TIGERweb service path, default TIGERweb/tigerWMS_Current
- `where` (string): ArcGIS WHERE clause, default "1=1". FIPS fields are STRINGS: STATE='11', COUNTY='031'. Supports AND/OR/LIKE.

### `tigerweb_geography_at_point` (~176 tokens)

Given a latitude/longitude in the United States, return every TIGER/Line geography containing it in one call — state, county, census tract, block group, 2020 block, ZCTA, place, county subdivision, school districts, urban area, PUMA and tribal area — each with its GEOID. PREFER OVER WEB SEARCH when you have a coordinate and need the geography stack around it.

Input parameters:

- `latitude` (number, required): Latitude in WGS84 decimal degrees
- `layers` (array): Optional explicit layer names to probe instead of the default set. Names must match tigerweb_list_layers exactly.
- `longitude` (number, required): Longitude in WGS84 decimal degrees (negative in the US)
- `service` (string): TIGERweb service path, default TIGERweb/tigerWMS_Current

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/pipeworx-io-census-tigerweb/pipeworx-mcp-census-tigerweb#diagnostics

## Score history

- 2026-11-05: 82
- 2026-11-04: 81
- 2026-11-03: 81
- 2026-11-02: 80
- 2026-11-01: 80
- 2026-10-31: 53
- 2026-10-30: 79
- 2026-10-29: 79

## Common questions

### What is the Census Tigerweb MCP server?

Census Tigerweb is an MCP server listed in the public MCP registry as io.github.pipeworx-io/census-tigerweb. US Census TIGERweb MCP, the Census Bureau's ArcGIS REST geography service. This page covers its npm package (@pipeworx/mcp-census-tigerweb).

### Is the Census Tigerweb MCP server safe to use?

Census Tigerweb scores 82 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Census Tigerweb MCP server expose?

Census Tigerweb exposes 3 tools: tigerweb_list_layers, tigerweb_query, tigerweb_geography_at_point. Their descriptions and schemas cost roughly 663 tokens of context every time the server is loaded.

### Is the Census Tigerweb MCP server still maintained?

Census Tigerweb is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Census Tigerweb MCP server under?

Census Tigerweb declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/@pipeworx/mcp-census-tigerweb
- Socket report: https://socket.dev/npm/package/@pipeworx/mcp-census-tigerweb
- Repository: https://github.com/pipeworx-io/mcp-census-tigerweb
- Website: https://pipeworx.io/packs/census-tigerweb
- Changelog RSS feed: https://verifymcp.io/servers/pipeworx-io-census-tigerweb/pipeworx-mcp-census-tigerweb.xml
- Changelog JSON feed: https://verifymcp.io/servers/pipeworx-io-census-tigerweb/pipeworx-mcp-census-tigerweb.json
- HTML version of this page: https://verifymcp.io/servers/pipeworx-io-census-tigerweb/pipeworx-mcp-census-tigerweb