Trello MCP Server

Create Label

create_label

Create a new label on a Trello board by specifying the board ID, label name, and color.

Instructions

Create a new label on a Trello board.

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": {
      "boardId": "<boardId>",
      "name": "<name>",
      "color": "<color>"
    },
    "name": "create_label"
  }
}

Input Schema

Name	Required	Description
`name`	Yes	Name of the label
`color`	Yes	Color of the label
`boardId`	Yes	The ID of the board

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.2.0Sep 6, 2026

TDQS

B3.4/5.0

Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states that a label is created and gives no information about idempotency, duplicate label behavior, permissions required, side effects, or what happens when invalid data is provided. For a mutation tool with zero annotation coverage, this is a meaningful gap.

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

Conciseness4/5

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

The description is a single, front-loaded sentence with no filler or repetition. It is appropriately sized for a simple tool, though it could have added a small amount of usage context without becoming bloated.

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?

The tool is simple and the schema fully describes its parameters, so an agent can infer the basic call structure. However, because there are no annotations and no output schema, the description leaves out behavioral details like response format, duplicate handling, and permission requirements, making it minimally adequate rather than complete.

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 description coverage is 100%, so the schema already documents all three parameters (name, color, boardId) and their constraints, including the color enum. The description adds no additional semantic detail beyond what the schema provides, which matches the baseline of 3.

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?

The description states a specific verb ('create'), a specific resource ('label'), and a clear scope ('on a Trello board'). This clearly distinguishes it from sibling tools like get_label, update_label, delete_label, and add_label_to_card without needing to inspect schemas.

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

Usage Guidelines3/5

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

The description implies the tool should be used when creating a new label on a board, and the verb naturally separates it from label read/update/delete tools. However, it does not explicitly mention when not to use it, what prerequisites exist (e.g., the board must already exist), or any alternative tools for similar operations.

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

Deploy Server