test_connection

THE RISK

Low Risk

Why test_connection needs a policy

A connection test only verifies that the MCP server can communicate with FreeCAD; it retrieves status information and does not create, modify, delete, or execute any meaningful operation.

From the tool's definition 'Test connection to FreeCAD' — purely a connectivity check with no side effects

Documented attack patterns abuse exactly the kind of access test_connection gives an agent:

POLICY

How to control test_connection

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Freecad, and nothing reaches the server without passing your rules. This is the rule we recommend for test_connection:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "test_connection": {}
  }
}

test_connection is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Mcp Freecad — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Mcp Freecad tools

Execute emit_custom_event Emit a custom event Execute freecad_boolean_cut Perform a boolean cut (difference) between two objects (object1 - object2). Execute subscribe_to_events Subscribe to FreeCAD events Write boolean_cut Perform boolean cut (subtraction) of two objects Write boolean_intersection Perform boolean intersection of two objects Write boolean_union Perform boolean union of two objects Write create_box Create a box/cube primitive in FreeCAD Write create_cone Create a cone primitive in FreeCAD

All 34 Mcp Freecad tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about test_connection

What does the test_connection tool do? +

Test connection to FreeCAD. It is categorised as a Read tool in the Mcp Freecad MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on test_connection? +

Register the Mcp Freecad MCP server in PolicyLayer and add a rule for test_connection: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Mcp Freecad. Nothing to install.

What risk level is test_connection? +

test_connection is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit test_connection? +

Yes. Add a rate_limit block to the test_connection rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block test_connection completely? +

Set action: deny in the PolicyLayer policy for test_connection. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides test_connection? +

test_connection is provided by the Mcp Freecad MCP server (jango-blockchained/mcp-freecad). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Freecad tool call.

Start from Mcp Freecad, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →