TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER

Adds a new custom board background for a specified Trello member; the file parameter (image data) is required.

SERVERTrello SOURCEmcp-server-trello

Medium RISK CLASS

Category Write

Parameters 40 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-custom-board-backgrounds-by-id-member.md

WHAT IT DOES

What TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER does on Trello

AI agents use TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_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 image data for the custom board background.
`tile`	string	—	Indicates whether the custom board background image should be tiled. Set to 'true' to enable tiling, or 'false' to disable it.
`idMember`	string	—	The ID or username of the Trello member for whom the custom board background will be added.
`brightness`	string	—	Specifies the brightness setting for the custom board background. Accepted values are 'dark', 'light', or 'unknown'.

Parameters from the server's own tool schema.

RISK

Why TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER is rated Medium

This tool creates or uploads new data (a custom board background image) to a Trello member account, which is a reversible write operation. It does not delete, execute arbitrary code, move money, or retrieve data.

From the tool's definition Tool name contains 'ADD' and description states 'Adds a new custom board background'; the `file` parameter indicates it creates/uploads new data to a member's account.

Risk signalsAccepts file system path (file)

Attacks that exploit this kind of access

RECOMMENDED RULE

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

TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER Rate-limited

TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_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_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER": {
      "limits": [
        {
          "counter": "trello_add_members_custom_board_backgrounds_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_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER call is checked against it from then on.

FAQ

Questions about TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER

What does the TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER tool do? +

Adds a new custom board background for a specified Trello member; the file parameter (image data) is required. 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_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER accept? +

TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER accepts 4 parameters: file, tile, idMember, brightness. 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_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER? +

Register the Trello MCP server in PolicyLayer and add a rule for TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_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_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER? +

TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_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_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER? +

Yes. Add a rate_limit block to the TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_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_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER completely? +

Set action: deny in the PolicyLayer policy for TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_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_CUSTOM_BOARD_BACKGROUNDS_BY_ID_MEMBER? +

TRELLO_ADD_MEMBERS_CUSTOM_BOARD_BACKGROUNDS_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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