TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD
Tool to retrieve a card's customFieldItems array. Use when you need structured metadata from custom fields for automation.
This record as markdown: /tools/trello/trello-get-cards-custom-field-items-by-id-card.md
What TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD does on Trello
AI agents call TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD 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 |
|---|---|---|---|
idCard | string | — | The ID or short link of the Trello card. |
Parameters from the server's own tool schema.
Why TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD is rated Low
This tool retrieves structured metadata from custom fields on a Trello card. It performs a read-only query operation with no side effects—it does not create, modify, delete, or execute any actions. The blast radius of misuse is minimal: an attacker could access card metadata they may not be authorized to view, but cannot alter board state or trigger external operations.
From the tool's definition Tool name includes 'GET' and description states 'retrieve a card's customFieldItems array' with no mention of modification or deletion.
Attacks that exploit this kind of access
The rule that runs TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD 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_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD, this is the rule to start with:
TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Trello, apply this rule, and every TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD call is checked against it from then on.
Questions about TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD
Tool to retrieve a card's customFieldItems array. Use when you need structured metadata from custom fields for automation. It is categorised as a Read tool in the Trello MCP Server, which means it retrieves data without modifying state.
TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD accepts 1 parameter: idCard. The full parameter table on this page comes from the server's own tool schema.
Register the Trello MCP server in PolicyLayer and add a rule for TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD: 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.
TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD 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.
Set action: deny in the PolicyLayer policy for TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD. 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.
TRELLO_GET_CARDS_CUSTOM_FIELD_ITEMS_BY_ID_CARD 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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