mcpField
E
Entropy0

Entropy0

Local
github.com/entropy0devSecurity1Updated 23w ago
Repository

About Entropy0

Entropy0 is an MCP server for agents that assesses URL and domain safety before browsing, fetching content, or submitting credentials. It returns trust and threat scores with a recommended action and reason codes.

Key features

  1. 01Check URL safety
  2. 02Evaluate domain safety
  3. 03Return trust and threat scores
  4. 04Recommend actions with reason codes

Use cases

  1. 01Assess a URL before an agent navigates to it
  2. 02Check a domain before fetching its content
  3. 03Evaluate a site before submitting credentials

MCP support

It exposes URL and domain safety checks as tools to MCP clients.

#mcp#trust#security#ai-agents#url-safety

Configuration

Local server config is the same for every client. Copy it into your client’s MCP config file.

mcp.json · Universal config
{
  "mcpServers": {
    "entropy0dev": {
      "command": "npx",
      "args": [
        "-y",
        "@entropy0/mcp"
      ],
      "env": {
        "ENTROPY0_API_KEY": "<ENTROPY0_API_KEY>"
      }
    }
  }
}
Run commandnpx -y @entropy0/mcp
Environment variables to set
ENTROPY0_API_KEYSecretYour Entropy0 API key (sk_ent0_xxxx). Get one at entropy0.ai.

Local servers need a runtime on your machine (e.g. Node.js 18+). Config file locations differ by client; see your client’s docs.

Packages
npm@entropy0/mcp0.1.3

Tools

6

Saved tool list · updated 2w ago

ParameterTypeRequiredDescription
urlstringYesFull URL to evaluate (e.g. https://example.com/path?q=1)
policy_profileenumNoEnforcement strictness: open / balanced / strict / criticalopen | balanced | strict | critical
interaction_kindenumNoWhat the agent intends to do with this targetnavigate | fetch | enrich | download_file | submit_credentials | initiate_payment
interaction_modeenumNoPrivilege level of the operationread_only | transactional | privileged
interaction_sensitivityenumNoSensitivity of the data context around this interactionlow | medium | high | critical

Details

From the project README

@entropy0/mcp

MCP server for Entropy0 — source trust and URL safety tools for AI agents.

Before your agent navigates a URL, fetches content, or submits credentials, Entropy0 tells it whether the domain is safe. Returns a recommended action (proceed, proceed_with_caution, sandbox, or deny) based on trust, threat, and structural anomaly signals.

Install

npx -y @entropy0/mcp

Or add to your MCP client config:

{
  "mcpServers": {
    "entropy0": {
      "command": "npx",
      "args": ["-y", "@entropy0/mcp"],
      "env": {
        "ENTROPY0_API_KEY": "sk_ent0_your_key_here"
      }
    }
  }
}

Get an API key at entropy0.ai.

Tools

check_url

Evaluate whether a URL is safe to interact with.

check_url({ url: "https://example.com", interaction: "navigate" })

Returns trust score, threat score, recommended action, and reason codes.

check_domain

Evaluate a bare domain name.

check_domain({ domain: "example.com" })

Response

{
  "recommended_action": "proceed",
  "scores": {
    "trust":     { "score": 88, "confidence": 0.91 },
    "threat":    { "score": 4,  "confidence": 0.87 },
    "deviation": { "score": 11, "confidence": 0.84 }
  },
  "decision": {
    "reason_codes": ["STRONG_TRUST_HISTORY", "LOW_THREAT_SIGNALS"]
  },
  "identity_assessment": {
    "claimed_entity": "stripe.com",
    "posture": "strongly_supported_entity_domain",
    "confidence": "high",
    "analyst_note": "Multiple independent structural signals support a stripe.com relationship."
  }
}

Requirements

  • Node.js 18+
  • An Entropy0 API key (sk_ent0_...)

Links

Comments

Markdown supported

New to MCP?

From what the protocol is to installing your first server, these answers cover most first questions.

An open protocol that defines how AI applications connect to external tools and data in a uniform way. Clients talk to the model; MCP servers provide tools, resources and prompt templates. They exchange standard messages, so one server can be reused by many clients.