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create_label

Add a new label to a Trello board by providing its ID and name, with an optional color.

Instructions

Create a new label on a board.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
colorNo
board_idYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
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. It discloses that the operation is a write ('create') but gives no additional behavioral details such as uniqueness constraints, permissions, or what happens if a label with the same name already exists. The description adds minimal value beyond the verb.

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?

The description is a single sentence that is front-loaded, direct, and contains zero redundant words. It effectively communicates the core action without any filler.

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

Completeness2/5

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

Despite the tool being relatively simple (3 params, output schema present), the description is too terse. It lacks any mention of prerequisites, validation, or edge cases. While the output schema covers return values, the description does not provide enough context for an agent to use the tool correctly in various scenarios.

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

Parameters2/5

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

Schema parameter description coverage is 0%, so the description must compensate. It only implicitly references board_id via 'on a board' and does not explain `name` or `color` semantics, constraints, or defaults. Thus, it provides only marginal meaning beyond the schema.

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 exactly what the tool does: creates a new label on a board. It uses a specific verb ('create') and resource ('label'), and the scope ('on a board') clearly distinguishes it from sibling tools like get_labels, delete_label, and add_label_to_card.

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?

The description provides no guidance on when to use this tool versus alternatives, no prerequisites, and no exclusions. It simply states the action without any contextual direction, leaving the agent to infer usage from the tool name.

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

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