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add_label

Attach an existing label to a Trello card using the card ID and label ID to organize and categorize tasks efficiently.

Instructions

Attach an existing label to a card.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
card_idYes
label_idYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

With no annotations, the description should disclose behaviors like idempotency, error handling, or side effects. It only states the action, omitting whether attaching a duplicate label fails or succeeds silently.

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 focused sentence, making it concise and front-loaded. However, it sacrifices helpful detail for brevity, which could be improved without becoming verbose.

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?

Given the lack of annotations and minimal description, the tool definition leaves gaps. It does not explain what happens if the label or card doesn't exist, or if the label is already attached. The output schema exists but its content isn't mentioned.

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 coverage is 0%, and the description adds no explanation for card_id or label_id. While parameter names are somewhat self-explanatory, the description fails to clarify that labels must already exist or any format requirements.

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 clearly states the action: attaching an existing label to a card. It uses a specific verb-resource combination and distinguishes itself from sibling tools like add_checklist or assign_member.

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 usage guidelines are provided. The description does not indicate when to use this tool versus alternatives, nor does it mention prerequisites or constraints (e.g., label must already exist, card must allow labels).

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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