Adds a label to an existing Trello card (specified by idCard), defining the label by name and either color or the overriding value (which specifies color by name); a new label is created on the board if a matching one (by name/color combination) doesn't already exist.
Part of the Trello server.
Free to start. No card required.
AI agents use TRELLO_ADD_CARDS_LABELS_BY_ID_CARD to create or modify resources in Trello. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call TRELLO_ADD_CARDS_LABELS_BY_ID_CARD repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Trello.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"TRELLO_ADD_CARDS_LABELS_BY_ID_CARD": {
"limits": [
{
"counter": "trello_add_cards_labels_by_id_card_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Trello policy for all 200 tools.
These attack patterns abuse exactly the kind of access TRELLO_ADD_CARDS_LABELS_BY_ID_CARD gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Adds a label to an existing Trello card (specified by idCard), defining the label by name and either color or the overriding value (which specifies color by name); a new label is created on the board if a matching one (by name/color combination) doesn't already exist.. 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.
Register the Trello MCP server in PolicyLayer and add a rule for TRELLO_ADD_CARDS_LABELS_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_ADD_CARDS_LABELS_BY_ID_CARD is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the TRELLO_ADD_CARDS_LABELS_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_ADD_CARDS_LABELS_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_ADD_CARDS_LABELS_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.
Deterministic rules across all 200 Trello tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.