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Atlassian Trello MCP Server

Atlassian Trello MCP Server

by agrath
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Remote

trello_add_label_to_card

Assign an existing label to a specific Trello card by providing the card ID and label ID.

Instructions

Assign an existing label to a Trello card.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "cardId": "<cardId>",
      "labelId": "<labelId>"
    },
    "name": "trello_add_label_to_card"
  }
}

Input Schema

NameRequiredDescriptionDefault
apiKeyNoTrello API key (optional if TRELLO_API_KEY env var is set)
tokenNoTrello API token (optional if TRELLO_TOKEN env var is set)
cardIdYesID of the card to label
labelIdYesID of the label to add

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.2.1

TDQS

B3.3/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description fails to disclose behavioral traits like idempotency, error handling (e.g., duplicate labels), or authentication requirements. 'Assign' implies mutation but no details.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Single sentence with no waste. Front-loaded with key action.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple tool with complete schema and no output schema, the description is minimally adequate but lacks context about prerequisites (label must exist) and error conditions. With no annotations, it falls short of full usefulness.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with descriptions for all parameters, but the description adds no additional meaning beyond what the schema provides. Baseline 3 maintained.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states the action: assigning an existing label to a Trello card. Distinguishes from sibling tools like trello_create_label (creates new) and trello_remove_label_from_card (removes).

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives, such as creating a label first if it doesn't exist, or removing a label if needed. No mention of prerequisites or context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Deploy Server

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