mettle-mcp

MCP server · PyPI · graded 2026-10-24Source linked

Experimental reverse CAPTCHA with signed badges and credentials. Not proof of identity or substrate.

No outside reports on file

mettle-mcp requires API keys or tokens; restrict its folder reach, network access, and credentials before installing.

Based on public adoption and transparency signals as of Oct 23, 2026. Our opinion, not a code audit or security guarantee.

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What it can access

Local filesNo local folder access notedLOW
Command executionNo shell command runner notedLOW
Network reachLocal or standard API callsLOW
CredentialsRequires API key or tokenREVIEW
Package sourcePyPI (mettle-verifier)PUBLIC

Inferred from this listing’s public package details and description. Check the project’s source before installing.

Install

uvx mettle-verifier

All setup options ↓

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About Mettle MCP

Mettle MCP is an MCP server focused on Developer tools: Experimental reverse CAPTCHA with signed badges and credentials. Not proof of identity or substrate.

It is published on PyPI as mettle-verifier and hosted on GitHub at Creed-Space/METTLE (127 PyPI downloads, last repository push on 2026-10-19). Based on its public metadata, its operational scope includes: requires api key or token.

Setup

These use the package this listing points to. Check the project’s own instructions before running anything.

PyPI command

uvx mettle-verifier

PyPI (pip) command

pip install mettle-verifier

MCP client config

For Claude Desktop (claude_desktop_config.json) or Cursor (.cursor/mcp.json).

json

{
  "mcpServers": {
    "mettle-verifier": {
      "command": "uvx",
      "args": [
        "mettle-verifier"
      ]
    }
  }
}

Why this grade

DD — High risk signals

Signal-based grade (1/7 points): public source code. This reflects adoption and transparency, not a code review.

Popularity and upkeep

18/100

PyPI downloads: 127
Listing last refreshed: 2026-10-28

These are public popularity signals, not a maintenance check. Look at the repository’s commit history and open issues.

Security reports

No reports found for this package in our research (last checked 2026-10-30).

Check a specific version →

Risks to watch for

Credential & token exposure: Requires API keys or secrets in configuration. Store credentials in environment variables with read-only or minimum required scopes and rotate them regularly.
Dependency & version pinning: Distributed via PyPI (mettle-verifier). Pin an exact release version or commit SHA rather than floating tags so upstream updates are reviewed first.

How to lower the risk

Least-privilege permissions

Give it access only to the specific folders, accounts or projects it needs, never your whole drive or admin account.
Use a separate, limited API key or login just for this tool so you can switch it off without affecting anything else.

Network isolation

Run it on a work computer or sandbox account, not one holding personal or company-sensitive data.
If your IT team can, limit which websites and services it is allowed to contact.

Monitoring

Check its activity history or logs weekly at first, and look at what it changed or sent.
Turn on alerts for new logins or unusual usage on any account it connects to.

Red flags to watch for

It asks for more access than its job requires, or prompts you to paste passwords.
It suddenly updates with new owners, or starts contacting unfamiliar websites.

Questions

How do I install Mettle MCP?

Run uvx mettle-verifier (or pip install mettle-verifier) in your terminal, or add the server entry to your claude_desktop_config.json or .cursor/mcp.json as shown in the Setup section on this page. Full setup docs and environment variables are in github.com/Creed-Space/METTLE.

Are there security reports about Mettle MCP?

No reports found for this package in our research (last checked 2026-10-30). Mettle MCP currently holds Grade D (High risk signals) based on public adoption and transparency signals. Review the permissions and source repository before granting access to local files, shell commands, or API keys.

Is Mettle MCP actively maintained?

Mettle MCP has 127 PyPI downloads, with its latest repository commit pushed on 2026-10-19. Our directory data was last refreshed on 2026-10-28. Check recent commit activity, release tags, and open issues at github.com/Creed-Space/METTLE before pinning it in production.

What are alternatives to Mettle MCP?

Compare Mettle MCP side by side with similar MCP servers in the Related tools section on this page, or browse all MCP servers on AgentArmorHQ.

Maintain or use Mettle MCP? Show its live grade in your GitHub README, docs site, or run a check from the terminal before you install.

AgentArmorHQ Risk Grade D for Mettle MCP

GitHub README Markdown:

markdown

[![AgentArmorHQ Risk Grade for Mettle MCP](https://agentarmorhq.com/api/badge/creed-space-mettle)](https://agentarmorhq.com/skills/creed-space-mettle)

HTML embed:

html

<a href="https://agentarmorhq.com/skills/creed-space-mettle"><img src="https://agentarmorhq.com/api/badge/creed-space-mettle" alt="AgentArmorHQ Risk Grade for Mettle MCP" height="20" /></a>

Terminal check:

terminal

curl -fsSL https://agentarmorhq.com/api/cli | node --input-type=module - check "creed-space-mettle"

Share with your security lead

Need sign-off to use mettle-mcp? Copy this note for Slack, a ticket or a pull request.

### AgentArmorHQ Security Review Memo: mettle-mcp
- **Listing URL:** https://agentarmorhq.com/skills/creed-space-mettle
- **Type:** App connector
- **Risk Grade:** Grade D (High risk signals)
- **Outside Security Advisories on File:** 0

#### Permission & Blast-Radius Signals
- **Local files:** No local folder access noted
- **Command execution:** No shell command runner noted
- **Network reach:** Local or standard API calls
- **Credentials:** Requires API key or token
- **Package source:** PyPI (mettle-verifier)

#### Recommended Hardened Setup
- **Command:** `uvx mettle-verifier`
- **Controls:** Pin an exact version in `.mcp.json`, scope access to a single workspace folder, and use a least-privilege read-only token where supported.

_Based on public adoption and transparency signals as of Oct 23, 2026. Our opinion, not a code audit or security guarantee._

Key facts

Type: App connector
Publisher: Creed-Space
Source code: github.com/Creed-Space/METTLE
Install command: pip install mettle-verifier
Est. context load: ~850 tokens / turn (~5 tool schemas, 0.43% of 200k context)
Popularity: 127 PyPI downloads
Last updated: 2026-10-28
Last graded: 2026-10-24

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