add_member

Add member to Trello board

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-member.md

WHAT IT DOES

What add_member does on Ncp

AI agents use add_member 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_member is rated Medium

The tool creates a new membership association on a Trello board, modifying board data and permissions. This is a Write operation (reversible modification) rather than Execute because it doesn't run arbitrary commands or code—it performs a specific, bounded action within Trello's API.

From the tool's definition "Add member to Trello board" - this tool modifies board membership by adding a member, which is a reversible write operation that changes shared access and collaboration state.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

add_member Rate-limited

add_member 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_member": {
      "limits": [
        {
          "counter": "add_member_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_member call is checked against it from then on.

FAQ

Questions about add_member

What does the add_member tool do? +

Add member to Trello board. 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_member? +

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

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

Can I rate-limit add_member? +

Yes. Add a rate_limit block to the add_member 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_member completely? +

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

add_member 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.

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