doctor

Run diagnostics on NCP system health and MCP configurations. Read-only - reports issues without making changes. Matches CLI: ncp doctor

SERVERNcp SOURCE@portel/ncp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-portel-dev-ncp/doctor.md

WHAT IT DOES

What doctor does on Ncp

AI agents call doctor to retrieve information from Ncp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why doctor is rated Low

The tool explicitly states it is read-only and only reports issues without making any changes. It performs diagnostic checks and returns health/configuration information, which is a pure Read operation with minimal risk.

From the tool's definition 'Run diagnostics on NCP system health and MCP configurations. Read-only - reports issues without making changes.'

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs doctor safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ncp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For doctor, this is the rule to start with:

doctor Allowed

doctor is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Ncp, apply this rule, and every doctor call is checked against it from then on.

FAQ

Questions about doctor

What does the doctor tool do? +

Run diagnostics on NCP system health and MCP configurations. Read-only - reports issues without making changes. Matches CLI: ncp doctor. It is categorised as a Read tool in the Ncp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on doctor? +

Register the Ncp MCP server in PolicyLayer and add a rule for doctor: 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 Ncp. Nothing to install.

What risk level is doctor? +

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

Can I rate-limit doctor? +

Yes. Add a rate_limit block to the doctor 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 doctor completely? +

Set action: deny in the PolicyLayer policy for doctor. 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 doctor? +

doctor is provided by the Ncp MCP server (@portel/ncp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Ncp, and thousands of servers like it.

This server

All 275 Ncp tools →

Across the catalogue

The MCP Attack Database →

Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →