add

Add MCP server(s) to NCP with smart auto-detection of input type. Supports multiple modes: (1) SINGLE: Add one MCP from registry or manual config (e.g.,

SERVERNcp SOURCE@portel/ncp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

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

WHAT IT DOES

What add does on Ncp

AI agents use add to create or update resources in Ncp, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ncp environment.

RISK

Why add is rated Medium

This tool modifies the system state by adding new MCP servers to the orchestration gateway. While the action is reversible (servers can presumably be removed), it materially alters the system's registered services and could expand attack surface if an AI agent adds malicious MCP servers.

From the tool's definition Tool name 'add' with description indicating it 'Add[s] MCP server(s) to NCP' creates new entries in the system configuration. The description shows it supports 'multiple modes' and 'manual config,' indicating reversible creation of MCP server configurations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs add 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 add, this is the rule to start with:

add Rate-limited

add stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add": {
      "limits": [
        {
          "counter": "add_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about add

What does the add tool do? +

Add MCP server(s) to NCP with smart auto-detection of input type. Supports multiple modes: (1) SINGLE: Add one MCP from registry or manual config (e.g.,. It is categorised as a Write tool in the Ncp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add? +

Register the Ncp MCP server in PolicyLayer and add a rule for add: 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 add? +

add is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit add? +

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

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

add 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

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