Entropy0

What is Entropy0?

Entropy0 is an MCP server that provides trust and URL safety tools for AI agents. It acts as a trust gate between the agent and the external web, returning a machine-readable recommended action before the agent fetches, navigates, or transacts. It's designed for developers building agents that interact with external URLs in environments like Claude Desktop, Cursor, and Cline.

How to use Entropy0?

Install the MCP server package via npm (@entropy0/mcp) and configure it with your Entropy0 API key. The server exposes tools that evaluate domains or URLs, returning a recommended action that your agent can reason about. Configuration details are managed through the MCP integration in your client application.

Key features of Entropy0

• Deterministic pipeline using WHOIS, DNS, SSL, and threat intel feeds
• Auditable, explainable, and overridable decisions with confidence clamps
• Low-confidence negatives never hard-deny
• Returns recommended_action, reason codes, and bounded validity window

Use cases of Entropy0

• Trust-gate every URL before an agent fetches its content
• Evaluate candidate sources in a LangGraph retrieval pipeline
• Block requests to flagged domains via Express middleware
• Prevent attribution of claims to sources where article body text was not captured

FAQ from Entropy0

How does Entropy0 make decisions?

Each decision runs a deterministic pipeline that classifies the domain (Clear Threat → Safe Known) using registered data, maps it to a base action under your chosen policy, shifts strictness based on interaction risk, and applies confidence clamps. Same inputs always produce the same output.

What data sources does Entropy0 use?

The pipeline uses WHOIS, DNS, SSL information, and threat intelligence feeds to classify domains and generate trust signals.

Do I need a runtime environment to use Entropy0?

The MCP server requires Node.js and npm. You can also use the direct API endpoint or the LangChain and Express packages.

Where does my data go?

Entropy0 is an external API service; domain evaluation requests are sent to https://entropy0.ai/v1/decide with your API key.

Is Entropy0 free?

You can get a free API key with 150 scans per month, no credit card required. A live playground is available without signing up.