TRELLO_GET_MEMBER_CUSTOM_BG

Retrieves metadata (e.g., brightness, URLs, tiling status) for a specific custom board background of a Trello member, not the image file itself.

SERVERTrello SOURCEmcp-server-trello

Low RISK CLASS

Category Read

Parameters 30 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/trello/trello-get-member-custom-bg.md

WHAT IT DOES

What TRELLO_GET_MEMBER_CUSTOM_BG does on Trello

AI agents call TRELLO_GET_MEMBER_CUSTOM_BG to retrieve information from Trello without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`fields`	string	—	Fields to return for the custom board background. Use 'all' or a comma-separated list. Allowed: `brightness`, `fullSizeUrl`, `scaled`, `tile`.
`idMember`	string	—	The ID or username of the Trello member.
`idBoardBackground`	string	—	Unique identifier of the custom board background to retrieve.

Parameters from the server's own tool schema.

RISK

Why TRELLO_GET_MEMBER_CUSTOM_BG is rated Low

This tool retrieves and returns metadata about a custom board background (brightness, URLs, tiling status) without modifying, creating, deleting, or executing anything. It is a straightforward data retrieval operation with no side effects, fitting the 'Read' category. The severity is low because metadata exposure has minimal impact compared to data modification or code execution.

From the tool's definition Tool name contains 'GET' and description explicitly states it 'Retrieves metadata' and 'not the image file itself', indicating a query-only operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

TRELLO_GET_MEMBER_CUSTOM_BG Allowed

TRELLO_GET_MEMBER_CUSTOM_BG is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "TRELLO_GET_MEMBER_CUSTOM_BG": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about TRELLO_GET_MEMBER_CUSTOM_BG

What does the TRELLO_GET_MEMBER_CUSTOM_BG tool do? +

Retrieves metadata (e.g., brightness, URLs, tiling status) for a specific custom board background of a Trello member, not the image file itself. It is categorised as a Read tool in the Trello MCP Server, which means it retrieves data without modifying state.

What parameters does TRELLO_GET_MEMBER_CUSTOM_BG accept? +

TRELLO_GET_MEMBER_CUSTOM_BG accepts 3 parameters: fields, idMember, idBoardBackground. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on TRELLO_GET_MEMBER_CUSTOM_BG? +

Register the Trello MCP server in PolicyLayer and add a rule for TRELLO_GET_MEMBER_CUSTOM_BG: 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_GET_MEMBER_CUSTOM_BG? +

TRELLO_GET_MEMBER_CUSTOM_BG is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit TRELLO_GET_MEMBER_CUSTOM_BG? +

Yes. Add a rate_limit block to the TRELLO_GET_MEMBER_CUSTOM_BG 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_GET_MEMBER_CUSTOM_BG completely? +

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

TRELLO_GET_MEMBER_CUSTOM_BG 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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