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

Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior. The description adds value beyond this by noting determinism, that the response is an allowlisted configuration, and that no media is processed or generated, which clarifies side-effect expectations for an agent.

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 compact sentences convey the core purpose, scope, determinism, and a key exclusion without redundancy. Key constraints are 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, single-parameter read-only tool with rich annotations and an output schema, the description is complete. It specifies what is returned (allowlisted configuration), scope, lookup semantics, determinism, and non-processing behavior, leaving no critical ambiguity for invocation.

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 100%, and the single parameter is already well documented as an 'Exact template id or name from list_templates'. The description reinforces the exact-match semantics and signed-in organization scope, but it does not add meaningful information beyond what the schema already provides.

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 names a specific verb ('Fetch') and resource ('one deterministic Imagelato resizing and reformatting preset'), and clarifies it fetches by exact id or name. It also distinguishes itself from media-processing tools by stating it does not process or generate media, and the singular focus differentiates it from sibling list_templates.

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 usage context is clear: fetch a single preset in the signed-in organization by exact id or name, and it explicitly excludes media processing. It does not name alternative siblings like list_templates or update_template, but the 'exact id or name' constraint and deterministic nature give the agent sufficient context for when to call it.

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