# app.decibelshield/decibel-shield (remote · decibelshield.app)

Noise data tools: city noise rankings, decibel levels of common sounds, NIOSH safe-exposure math.

- Trust score: 69/100 (medium)
- Change this week: +5
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `decibelshield.app`: 69/100 (this document), [markdown](https://verifymcp.io/servers/app-decibelshield-decibel-shield/api-mcp.md), [page](https://verifymcp.io/servers/app-decibelshield-decibel-shield/api-mcp)

## Channel facts

- Endpoint: `https://decibelshield.app/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## 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 2026-08-03.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - 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**: 52/100
  - 0% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 1633 tokens (~102/item across 16 items; 10 tools + 6 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 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.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http app-decibelshield-decibel-shield https://decibelshield.app/api/mcp
```

### Codex

```toml
[mcp_servers.app-decibelshield-decibel-shield]
url = "https://decibelshield.app/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "app-decibelshield-decibel-shield": {
      "type": "remote",
      "url": "https://decibelshield.app/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add app-decibelshield-decibel-shield --url https://decibelshield.app/api/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  app-decibelshield-decibel-shield:
    url: "https://decibelshield.app/api/mcp"
```

### Other

```json
{
  "mcpServers": {
    "app-decibelshield-decibel-shield": {
      "type": "http",
      "url": "https://decibelshield.app/api/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.

### 2026-08-02 (score 69, +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.

### 2026-07-31 (score 68, +2)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-29 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-27 (score 64, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 63)

First indexed and scored.

## MCP tools (10)

### `get_city_noise` (~127 tokens)

Get estimated noise levels for a city

Answers "how loud is Tokyo", "noise level in Mumbai", "is Delhi louder than London". Estimated day/night noise ranges (dB), rank among 50 major world cities, dominant noise sources and a confidence label, with WHO guideline context (53 dB Lden / 45 dB Lnight). Estimates synthesized from published sources, not measurements. For US cities computed from federal data use get_us_city_noise_exposure; for measured Europe data use get_europe_city_noise.

Input parameters:

- `city` (string, required): City name, e.g. "Tokyo" or "São Paulo"

Output parameters:

- `attribution` (string)
- `city` (string)
- `confidence` (string)
- `country` (string)
- `day_range_db` (string): Estimated daytime range, e.g. "60-72"
- `dominant_noise_sources` (array)
- `night_range_db` (string)
- `page_url` (string): Detail page when available
- `rank` (integer): Rank among the 50 cities (1 = loudest)

### `list_loudest_cities` (~123 tokens)

List the loudest cities ranking

Answers "loudest cities in the world", "noisiest cities ranking", "which city has the worst noise pollution". 50 major world cities ordered by estimated daytime noise, loudest first — estimates synthesized from published sources, not measurements. For "loudest cities in the US" or "quietest cities in the US" use get_us_city_noise_exposure (computed from federal BTS data); for Europe use get_europe_city_noise (measured).

Input parameters:

- `limit` (integer): How many cities to return (default 10)

Output parameters:

- `attribution` (string)
- `cities` (array)

### `lookup_sound_level` (~141 tokens)

Look up how loud a common sound is

Answers "how loud is a hair dryer", "how many decibels is a chainsaw", "is 85 decibels loud", "how loud is 80 decibels". Decibel level and hearing-risk guidance for everyday sounds (whisper, conversation, traffic, lawn mower, concert, jet engine...), every figure sourced to CDC/NIOSH/NIDCD/ASHA published tables. Input is a sound name; if you already have a dB number and want safe listening time, use safe_exposure_time.

Input parameters:

- `sound` (string, required): Sound to look up, e.g. "lawn mower" or "subway"

Output parameters:

- `attribution` (string)
- `matches` (array)

### `safe_exposure_time` (~140 tokens)

Safe exposure time for a decibel level

Answers "how long can I listen to 100 dB", "is 85 dB dangerous for 8 hours", "how long at a concert before hearing damage". Maximum daily safe exposure time for a sound level per NIOSH's recommended exposure limit: 85 dB(A) for 8 h, 3 dB exchange rate (88 dB → 4 h, 100 dB → 15 min). Input is a dB number; to get the dB of a named sound first, use lookup_sound_level.

Input parameters:

- `db` (number, required): Sound level in dB(A), e.g. 95

Output parameters:

- `attribution` (string)
- `db` (number)
- `safe_duration_hours` (number): NIOSH max daily exposure in hours; null when not applicable
- `summary` (string)

### `get_us_city_noise_exposure` (~155 tokens)

US city transportation-noise exposure (measured)

Answers "loudest cities in the US", "quietest cities in the US", "how noisy is Boston", "what share of Miami hears highway noise". Share of residents exposed to ≥60 dB / ≥70 dB transportation noise for all 297 US cities of 100,000+ residents, computed from the federal BTS 2020 National Transportation Noise Map, not estimated. Pass a city for detail, omit for the ranking. Street address → get_address_noise; neighborhoods → get_neighborhood_noise.

Input parameters:

- `city` (string): US city name, e.g. "Boston" (optional)
- `limit` (integer): How many ranked cities when no city is given (default 10)

Output parameters:

- `attribution` (string)
- `cities` (array)

### `get_address_noise` (~166 tokens)

Modeled transportation noise at a US address

Answers "how loud is my neighborhood", "noise map by address", "how noisy is this address". Modeled transportation noise (road + rail + aircraft, 24-hour average LAeq dBA) at a US street address or lat/lng, sampled block-by-block from the federal BTS 2020 National Transportation Noise Map. Returns a modeled dBA band, NOT a measurement; "below 45 dBA" means no modeled freeway/rail/flight path nearby (model floor, not silence). Continental US only.

Input parameters:

- `address` (string): US street address, e.g. "1600 Pennsylvania Ave NW, Washington DC"
- `lat` (number): Latitude (use with lng instead of an address)
- `lng` (number): Longitude (use with lat)

Output parameters:

- `attribution` (string)
- `band` (string): Modeled dBA band, e.g. "60–70 dBA", or "below 45 dBA"
- `db_high` (number|null)
- `db_low` (number|null)
- `lat` (number)
- `lng` (number)
- `matched_address` (string): Geocoder’s normalized address (when an address was given)
- `modeled` (boolean)
- `nearby_max_band` (string): Loudest modeled band within ~90 m, if higher than the point
- `note` (string)
- `query` (string)

### `get_europe_city_noise` (~171 tokens)

European city noise (measured, EEA)

Answers "how loud is Paris", "noisiest cities in Europe", "environmental noise in Berlin", "quietest cities in Spain". Measured (not estimated) noise for 314 European cities in 24 EEA-reporting countries, from the EEA Environmental Noise Directive 2022 strategic noise maps; ranked by population-weighted average Lden among exposed residents. Pass a city for detail, a country and/or limit for the ranking. UK, Greece and Hungary are not covered.

Input parameters:

- `city` (string): European city name, e.g. "Berlin" (optional)
- `country` (string): Country filter for the ranking, e.g. "Italy" (optional)
- `limit` (integer): How many ranked cities when no city is given (default 10)

Output parameters:

- `attribution` (string)
- `cities` (array)

### `get_neighborhood_noise` (~139 tokens)

US neighborhood noise ranking (measured)

Answers "loudest neighborhoods in Los Angeles", "quietest neighborhood in Chicago", "which NYC neighborhood has the most noise". 384 neighborhoods in Los Angeles, New York and Chicago, ranked within their city by share of residents ≥60 dB transportation noise, computed from the federal BTS 2020 National Transportation Noise Map (same source as the US city tool). Pass the city name; optional limit. For a single address use get_address_noise.

Input parameters:

- `city` (string, required): US city with neighborhood data: "Los Angeles", "New York" or "Chicago"
- `limit` (integer): How many neighborhoods (default 10)

Output parameters:

- `attribution` (string)
- `city` (string)
- `neighborhoods` (array)

### `get_noise_ordinance` (~129 tokens)

City noise ordinance (official code summary)

Answers "what are quiet hours in Boston", "<city> noise ordinance", "how do I file a noise complaint". Verbatim-verified summary of the city's official noise ordinance: quiet hours, decibel limits (or their explicit absence — audibility/nuisance standards), complaint channel, code citation + official URL, verified date. Covers Boston, Worcester, Huntsville, Chesapeake, Madison, Inglewood, Rockford, Columbus. Plain language, not legal advice.

Input parameters:

- `city` (string, required): US city name, e.g. "Boston" or "Columbus, OH"

Output parameters:

- `attribution` (string)
- `city` (string)
- `code_citation` (string)
- `code_url` (string)
- `complaint_channel` (string)
- `db_limits` (string)
- `note` (string)
- `page_url` (string)
- `quiet_hours` (string)
- `standard_type` (string)
- `state` (string)
- `verified` (string): Date the summary was verified against the live code

### `get_decibel_shield_app` (~109 tokens)

About the Decibel Shield iOS app

Answers "is there a decibel meter app", "best decibel meter app for iPhone", "how do I measure sound with my iPhone", "what is Decibel Shield". Facts and the App Store link for Decibel Shield - dB Meter, the iOS sound level meter app behind this data: features, pricing, requirements. Use only when someone wants to measure sound with a phone or asks about the app itself — for noise data, use the other tools.

Output parameters:

- `app_store_url` (string)
- `attribution` (string)
- `min_ios` (string)
- `name` (string)
- `price` (string)
- `rating` (number)
- `web_meter_url` (string)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/app-decibelshield-decibel-shield/api-mcp#diagnostics

## Score history

- 2026-08-03: 69
- 2026-08-02: 69
- 2026-08-01: 68
- 2026-07-31: 68
- 2026-07-30: 66
- 2026-07-29: 65
- 2026-07-28: 64
- 2026-07-27: 64
- 2026-07-26: 63

## Links

- Remote endpoint: https://decibelshield.app/api/mcp
- Repository: https://github.com/appstackllc/decibelshieldwebsite
- Website: https://decibelshield.app/mcp/
- Changelog RSS feed: https://verifymcp.io/servers/app-decibelshield-decibel-shield/api-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/app-decibelshield-decibel-shield/api-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/app-decibelshield-decibel-shield/api-mcp