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Collar Guardrail — Pre-Trade Risk Layer

io.github.aiguardrail/backend in the official MCP registry. Endpoint https://api.collarguardrail.com/mcp-http/mcp. Source: github.com/aiguardrail/backend-mcp.

The registry describes it as: Deterministic pre-trade risk checks for AI agents on Robinhood Chain. Returns allow/warn/deny.

We read its 6 tools on 2026-10-29. Nothing in them matched our tool-poisoning rules.

A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.

Connect it

The endpoint answers MCP over HTTP; that is how we read it. Add it to your client:

Claude Code

claude mcp add --transport http backend https://api.collarguardrail.com/mcp-http/mcp

Cursor: ~/.cursor/mcp.json

{
  "mcpServers": {
    "backend": {
      "url": "https://api.collarguardrail.com/mcp-http/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"backend","type":"http","url":"https://api.collarguardrail.com/mcp-http/mcp"}'

Some servers ask you to sign in the first time a client connects, or want a key from the people who run them; the server's own docs say which. The free lazaretto-guard plugin reads a server's tools the moment Claude Code adds it and asks you if one of our rules matches.

Tools it advertises

evaluate_trade evaluate_trade_paid check_token_safety simulate_balance get_supported_assets verify_audit_trail

Run this server? Show the check in your README

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Markdown

[![MCP tool check](https://lazaretto.dev/mcp-registry/io-github-aiguardrail-backend/badge.svg)](https://lazaretto.dev/mcp-registry/io-github-aiguardrail-backend)

How this was checked

Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.

To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.