# MQTT Specification (pypi · mqtt-spec-mcp)

Offline MCP server for navigating the OASIS MQTT 3.1.1 and 5.0 specifications

- Trust score: 59/100 (low)
- Change this week: −15
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-04

## Components

- pypi · `mqtt-spec-mcp`: 59/100 (this document), [markdown](https://verifymcp.io/servers/cartertinney-mqtt-spec-mcp/mqtt-spec-mcp.md), [page](https://verifymcp.io/servers/cartertinney-mqtt-spec-mcp/mqtt-spec-mcp)

## Channel facts

- Registry: `pypi`
- Package: `mqtt-spec-mcp`
- Version: `0.1.0`
- 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 2026-11-04.

- **Supply Chain Security**: 50/100
  - Malware scan not yet available for this package.
  - No known CVEs affecting this package version or its production dependencies.
  - Runs uv_build at install time, a recognised build step with no custom scripting around it.
  - 1 of 28 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 84/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to cartertinney/mqtt-spec-mcp).
  - License check failed: the license (MIT AND LicenseRef-OASIS-Notices) isn't a recognized OSI-approved license.
  - Actively maintained (last published 13 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 59/100
  - AI-judged instruction clarity (fair).
  - Tool/resource definitions use about 479 tokens (~119/item across 4 items; 4 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 85/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 55% 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 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

### How do I install the MQTT Specification MCP server?

MQTT Specification runs locally as a PyPI package, launched with uvx mqtt-spec-mcp. 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 cartertinney-mqtt-spec-mcp -- uvx mqtt-spec-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "cartertinney-mqtt-spec-mcp": {
      "command": "uvx",
      "args": [
        "mqtt-spec-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "cartertinney-mqtt-spec-mcp": {
      "command": "uvx",
      "args": [
        "mqtt-spec-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add cartertinney-mqtt-spec-mcp -- uvx mqtt-spec-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "cartertinney-mqtt-spec-mcp": {
      "type": "local",
      "command": [
        "uvx",
        "mqtt-spec-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add cartertinney-mqtt-spec-mcp --command uvx --arg mqtt-spec-mcp
```

### Hermes

```yaml
mcp_servers:
  cartertinney-mqtt-spec-mcp:
    command: "uvx"
    args: ["mqtt-spec-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "cartertinney-mqtt-spec-mcp": {
      "Transport": "stdio",
      "Command": "uvx",
      "Arguments": [
        "mqtt-spec-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add cartertinney-mqtt-spec-mcp -t stdio -c uvx -a mqtt-spec-mcp
```

### Other

```json
{
  "mcpServers": {
    "cartertinney-mqtt-spec-mcp": {
      "command": "uvx",
      "args": [
        "mqtt-spec-mcp"
      ]
    }
  }
}
```

## 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.

### 2026-11-04 (score 59, −15)

- [security regression] Malware scan: pass → unverified

### 2026-11-03 (score 74, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-10-29 (score 59, −15)

- [security regression] Malware scan: pass → unverified

### 2026-10-27 (score 74, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-10-26 (score 59, −15)

- [security regression] Malware scan: pass → unverified

### 2026-10-22 (score 74, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-10-21 (score 59)

First indexed and scored.

## MCP tools (4)

### `mqtt_spec_outline` (~37 tokens)

MQTT spec outline

Section ids and titles of one MQTT version, for browsing.

Input parameters:

- `parent` (string): Section id.
- `version` (string, required)

### `mqtt_spec_search` (~57 tokens)

MQTT spec search

Evidence from one MQTT version: excerpts of the sections that best match the question.

Input parameters:

- `query` (string, required): The question's key terms; for several parts, one group per part, separated by ';'.
- `version` (string, required)

### `mqtt_spec_get` (~54 tokens)

MQTT spec get section

One section of one MQTT version as Markdown pages; continue a page with its Next cursor.

Input parameters:

- `cursor` (string): Next cursor.
- `section` (string, required): Section id or title.
- `version` (string, required)

### `mqtt_spec_lookup` (~75 tokens)

MQTT spec lookup

Exact entry for one packet, property or reason_code (5.0), return_code (3.1.1), requirement label or glossary term.

Input parameters:

- `kind` (string, required)
- `packet` (string): Packet filter.
- `query` (string, required): Exact name, number or label.
- `version` (string, required)

## Diagnostics

Captured diagnostic sections: Provenance, Install scripts, Dependencies. The full working is on the page: https://verifymcp.io/servers/cartertinney-mqtt-spec-mcp/mqtt-spec-mcp#diagnostics

## Score history

- 2026-11-04: 59
- 2026-11-03: 74
- 2026-11-02: 59
- 2026-11-01: 59
- 2026-10-31: 59
- 2026-10-30: 59
- 2026-10-29: 59
- 2026-10-28: 74
- 2026-10-27: 74
- 2026-10-26: 59
- 2026-10-25: 74
- 2026-10-24: 74
- 2026-10-23: 74
- 2026-10-22: 74
- 2026-10-21: 59

## Common questions

### What is the MQTT Specification MCP server?

MQTT Specification is an MCP server listed in the public MCP registry as io.github.cartertinney/mqtt-spec-mcp. Offline MCP server for navigating the OASIS MQTT 3.1.1 and 5.0 specifications. This page covers its PyPI package (mqtt-spec-mcp).

### Is the MQTT Specification MCP server safe to use?

MQTT Specification scores 59 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 4 November 2026. 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 MQTT Specification MCP server expose?

MQTT Specification exposes 4 tools: mqtt_spec_outline, mqtt_spec_search, mqtt_spec_get, mqtt_spec_lookup. Their descriptions and schemas cost roughly 223 tokens of context every time the server is loaded.

### Is the MQTT Specification MCP server still maintained?

MQTT Specification is still listed as active in the MCP registry. We last reached this channel on 4 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 MQTT Specification MCP server under?

MQTT Specification declares the MIT AND LicenseRef-OASIS-Notices licence, which is not on the OSI-approved list. Read the terms before using it at work, and note this covers the source only, not the cost of any service it calls.

## Links

- PyPI project: https://pypi.org/project/mqtt-spec-mcp/
- Socket report: https://socket.dev/pypi/package/mqtt-spec-mcp
- Repository: https://github.com/cartertinney/mqtt-spec-mcp
- Changelog RSS feed: https://verifymcp.io/servers/cartertinney-mqtt-spec-mcp/mqtt-spec-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/cartertinney-mqtt-spec-mcp/mqtt-spec-mcp.json
- HTML version of this page: https://verifymcp.io/servers/cartertinney-mqtt-spec-mcp/mqtt-spec-mcp