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

Annotations already declare the tool as a non-read-only, non-destructive, non-idempotent mutation. The description adds useful context that expectedSpecVersion prevents stale writes and that labels can be cleared, but it does not explain permissions, side effects, or return behavior.

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?

Two tight sentences with no wasted language, and the core operation is front-loaded before the versioning caveat.

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 mutation tool with annotations and no output schema, the description covers the main action and concurrency requirement but omits return expectations. The complex nested label object is left mostly to the schema.

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?

The description explains the purpose of expectedSpecVersion, which is valuable, but it adds no meaning for projectId or the nested input object beyond what the schema already documents for layerId, label, and title. With low schema description coverage, this partial compensation leaves significant gaps.

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 a specific verb and resource: 'Configure or clear the label definition for a map layer.' This clearly distinguishes label configuration from sibling styling and visibility tools, though it does not explicitly name those alternatives.

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 phrase 'Configure or clear' implies when the tool is used, and the expectedSpecVersion note gives a prerequisite, but there is no explicit guidance on when to choose this tool over project_update_layer_style or other layer tools.

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