# Postal Lookup MCP

> Free, keyless postal/ZIP code lookup: place name(s), state/region, and coordinates.

- name: io.github.Lulu-The-Narwhal/postal-lookup-mcp
- version: 0.1.1
- connection class: R0 (autonomous)
- trust: 87/100 flags: duplicate-repo
- quality: 85/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/io.github.Lulu-The-Narwhal%2Fpostal-lookup-mcp
- tools: https://api.protogrid.dev/v1/servers/io.github.Lulu-The-Narwhal%2Fpostal-lookup-mcp/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "postal-lookup-mcp": {
      "type": "http",
      "url": "https://ads.getlulu.dev/postal/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 100
- freshness: 85
- provenance: 80
- drivers: +repository +namespace-matches-repo +reachable +uptime-100% ~updated-62d-ago -duplicate-repo(8 names)
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 85/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 86 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 1 of 1 tools declare readOnlyHint or destructiveHint
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: lookup_postal_code (destructiveHint, idempotentHint, openWorldHint)
- pass `tools.token_cost`: about 213 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 1, about 213 tokens to load them all
- tool set hash: 8ea51da2536b5b0d2ed52e0fea101d71
- badge: [![protogrid quality](https://protogrid.dev/badge/io.github.Lulu-The-Narwhal/postal-lookup-mcp.svg)](https://protogrid.dev/servers/io.github.Lulu-The-Narwhal/postal-lookup-mcp)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://ads.getlulu.dev/postal/mcp (streamable-http, auth none, reachable true, uptime30d 1)

## Packages

_none_

## Tools (1)

- `lookup_postal_code`: Resolve a postal/ZIP code to its place name(s), state/region, and
coordinates. `country_code` is a 2-letter ISO code (US, GB, DE, ...);
`postal_code` format varies by country (e.g. "90210" for the US,
"SW1A 1AA" style outward codes for the UK). Use for "what city is ZIP
90210 in", "where is postal code X in country Y", or any question
that needs a place name/region/lat-lon from a postal code -- not for
the reverse (place name to postal code) or for full street address
lookup. Some postal codes span multiple places, in which case all of
them are returned. Returns an error dict (never raises) if the code
isn't recognized for that country.