assign_member

Assign a board member to a card.

SERVERTrello SOURCEartemnikov/trello-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade B, identity unverified Pull the record →

This record as markdown: /tools/artemnikov-trello-mcp/assign-member.md

WHAT IT DOES

What assign_member does on Trello

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

RISK

Why assign_member is rated Medium

This tool creates or modifies a reversible assignment relationship between a board member and a card. It does not delete data, execute code, or move money. The impact is limited to updating card state, affecting only task assignments on a Trello board.

From the tool's definition Tool name 'assign_member' and description 'Assign a board member to a card' indicates modification of card metadata by adding a member assignment.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs assign_member safely

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

assign_member Rate-limited

assign_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": {
    "assign_member": {
      "limits": [
        {
          "counter": "assign_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 Trello, apply this rule, and every assign_member call is checked against it from then on.

FAQ

Questions about assign_member

What does the assign_member tool do? +

Assign a board member to a card. It is categorised as a Write tool in the Trello MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on assign_member? +

Register the Trello MCP server in PolicyLayer and add a rule for assign_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 Trello. Nothing to install.

What risk level is assign_member? +

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

Can I rate-limit assign_member? +

Yes. Add a rate_limit block to the assign_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 assign_member completely? +

Set action: deny in the PolicyLayer policy for assign_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 assign_member? +

assign_member is provided by the Trello MCP server (artemnikov/trello-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Trello, and thousands of servers like it.

This server

All 16 Trello tools →

Across the catalogue

The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →