TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER

Updates a Trello member's avatar using a base64-encoded image; the file field, though schema-optional, requires valid image data for a successful update.

SERVERTrello SOURCEmcp-server-trello

Medium RISK CLASS

Category Write

Parameters 20 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/trello/trello-add-members-avatar-by-id-member.md

WHAT IT DOES

What TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER does on Trello

AI agents use TRELLO_ADD_MEMBERS_AVATAR_BY_ID_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.

Parameter	Type	Required	Description
`file`	string	—	Base64-encoded string of the new avatar image (e.g., PNG, JPEG). Although schema-optional, a valid image string is required for successful avatar update.
`idMember`	string	—	The ID or username of the Trello member.

Parameters from the server's own tool schema.

RISK

Why TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER is rated Medium

This tool modifies member profile data (avatar image) in a reversible manner. It is a Write operation rather than Read (retrieves data), Execute (runs arbitrary code), Destructive (irreversibly deletes data), or Financial (moves money).

From the tool's definition Updates a Trello member's avatar using a base64-encoded image

Risk signalsAccepts file system path (file)

Attacks that exploit this kind of access

RECOMMENDED RULE

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

TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER Rate-limited

TRELLO_ADD_MEMBERS_AVATAR_BY_ID_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": {
    "TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER": {
      "limits": [
        {
          "counter": "trello_add_members_avatar_by_id_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 TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER call is checked against it from then on.

FAQ

Questions about TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER

What does the TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER tool do? +

Updates a Trello member's avatar using a base64-encoded image; the file field, though schema-optional, requires valid image data for a successful update. 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.

What parameters does TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER accept? +

TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER accepts 2 parameters: file, idMember. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER? +

Register the Trello MCP server in PolicyLayer and add a rule for TRELLO_ADD_MEMBERS_AVATAR_BY_ID_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 TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER? +

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

Can I rate-limit TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER? +

Yes. Add a rate_limit block to the TRELLO_ADD_MEMBERS_AVATAR_BY_ID_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 TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER completely? +

Set action: deny in the PolicyLayer policy for TRELLO_ADD_MEMBERS_AVATAR_BY_ID_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 TRELLO_ADD_MEMBERS_AVATAR_BY_ID_MEMBER? +

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

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