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

Annotations provide no safety profile beyond false flags, so the description carries some burden. It adds useful context about the types of changes (rename, color, team/workspace move) but does not disclose side effects such as whether moving a label to a team affects existing issues, or what happens if no update fields are provided. No contradiction with annotations.

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

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

One compact sentence with parallel structure and no filler. The main purpose is front-loaded and every word earns its place.

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

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

For a simple four-parameter update tool with a reasonably descriptive schema, the definition covers the main call path well. The main gap is not warning that all update fields are optional, so a call with only the required label parameter might be invalid or a no-op. Still, the operations are clear enough for typical use.

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

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

Schema description coverage is 50%, with label and team already documented. The description adds meaning for name and color by tying them to 'rename' and 'colour', and for team by describing the move operation. It does not fully compensate for the undocumented fields, nor does it mention that at least one update field should be provided.

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

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

The description uses concrete verbs and a clear resource: 'Rename a label, change its colour, or move it between a team and the whole workspace.' It names the exact update operations and is easily distinguished from siblings like create_label, delete_label, and list_labels.

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

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

The description gives clear usage context by enumerating the three actions an agent can perform. It does not explicitly name alternatives or exclusions, but the distinction from create/delete/list operations is clear enough from context.

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