set_gp_layer_property

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

The annotations provide idempotentHint=true, which already communicates that repeated sets are safe. The description adds the enumeration of possible properties but does not disclose any additional behavioral traits such as how invalid property names are handled, what the return value looks like, or whether changes affect other layers. It does not contradict annotations; it simply adds minimal context beyond them.

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?

The description is a single, front-loaded sentence that immediately states the purpose and lists examples. Every word earns its place; there is no verbosity or redundancy.

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?

The tool is a simple setter with four parameters and an output schema, so the description need not explain return values. Combined with the idempotentHint annotation, the description is adequate for invoking the tool correctly. It could be improved by noting that the layer must already exist or that property names are case-sensitive, but these are minor gaps given the tool's simplicity.

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 0%, so the description must compensate. It adds meaning to the 'property' parameter by listing allowed values, and hints at value types (e.g., color as array, opacity/thickness as number, use_lights as boolean). However, it does not explain the 'object' and 'layer' parameters, which the agent must infer from context. Value types are already in the schema, so the description only partially compensates for the missing schema descriptions.

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 begins with the action verb 'Set' and identifies the specific resource 'GP layer property', which clearly distinguishes it from sibling tools like set_material_property or set_light_property. It also lists the exact property names (color, opacity, thickness, use_lights) that can be set, providing concrete scope.

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 implies usage by naming the resource (GP layer), so an agent can infer this tool is for modifying grease pencil layer properties. However, it does not explicitly state when to use this tool versus alternatives, nor does it mention any prerequisites or exclusions. The guidance is only implicit through the tool name and description.

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