# Postal Lookup MCP (remote · ads.getlulu.dev)

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

- Trust score: 55/100 (low)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-09

## Components

- remote · `ads.getlulu.dev`: 55/100 (this document), [markdown](https://verifymcp.io/servers/lulu-the-narwhal-postal-lookup-mcp/postal-mcp.md), [page](https://verifymcp.io/servers/lulu-the-narwhal-postal-lookup-mcp/postal-mcp)

## Channel facts

- Endpoint: `https://ads.getlulu.dev/postal/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.1`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, 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 2026-08-09.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 1 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 45/100
  - 0% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 213 tokens (~71/item across 3 items; 1 tools + 2 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 7/100
  - Stability observed for 2 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 71/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.
  - Supports UI / widget rendering.

## Install

### Claude

```bash
claude mcp add --transport http lulu-the-narwhal-postal-lookup-mcp https://ads.getlulu.dev/postal/mcp
```

### Codex

```toml
[mcp_servers.lulu-the-narwhal-postal-lookup-mcp]
url = "https://ads.getlulu.dev/postal/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "lulu-the-narwhal-postal-lookup-mcp": {
      "type": "remote",
      "url": "https://ads.getlulu.dev/postal/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add lulu-the-narwhal-postal-lookup-mcp --url https://ads.getlulu.dev/postal/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  lulu-the-narwhal-postal-lookup-mcp:
    url: "https://ads.getlulu.dev/postal/mcp"
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## 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.

### 2026-08-09 (score 55, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-08 (score 54, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-08-07 (score 54)

First indexed and scored.

## MCP tools (1)

### `lookup_postal_code` (~199 tokens)

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.

Input parameters:

- `country_code` (string, required)
- `postal_code` (string, required)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/lulu-the-narwhal-postal-lookup-mcp/postal-mcp#diagnostics

## Score history

- 2026-08-09: 55
- 2026-08-08: 54
- 2026-08-07: 54

## Links

- Remote endpoint: https://ads.getlulu.dev/postal/mcp
- Repository: https://github.com/Lulu-The-Narwhal/lulu-platform
- Changelog RSS feed: https://verifymcp.io/servers/lulu-the-narwhal-postal-lookup-mcp/postal-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/lulu-the-narwhal-postal-lookup-mcp/postal-mcp.json
- HTML version of this page: https://verifymcp.io/servers/lulu-the-narwhal-postal-lookup-mcp/postal-mcp