gmcbuilder_lite_summarize_layout

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

The annotations already declare readOnly, idempotent, closed-world and non-destructive, so the safety profile is covered. The description adds genuinely new behavioral information by pre-empting the most likely agent concern for a read tool over a layout: that it will not surface layout content or settings. It does not say what the summary actually contains (counts vs. type names).

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?

A single compact clause-pair that front-loads the action and appends the key output constraint. No filler, nothing repeated from the name or schema.

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?

With no output schema, the description should characterize the return value; "summarize node types" leaves open whether the agent gets type names, counts, or both. For a single-parameter read tool with rich annotations this is adequate but has a visible gap.

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?

There is one parameter with 0% schema description coverage, so the description must carry the burden. It only implies that the input is JSON holding nodes; it never states whether layout_json is a serialized JSON string versus an object, nor what shape the payload must have (e.g. a nodes array).

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?

Names a specific verb (summarize) and resource (node types in the supplied layout JSON), so the agent can tell it operates on a layout payload rather than on a site or the global element-type catalog. It does not explicitly distinguish itself from gmcbuilder_lite_list_element_types, which is a plausible point of confusion for an agent looking for type information.

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?

"Supplied JSON" weakly implies the preconditions (you already hold a layout payload) and distinguishes it from the catalog-listing siblings by implication only. There is no explicit when-to-use, when-not-to-use, or named alternative.

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