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

Goes well beyond the annotations: it states that each call creates another preset (explaining the non-idempotentHint), that template.created fires to configured webhooks, and critically that it does not process an image, which prevents a likely misuse given the destructiveHint.

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?

Front-loaded with the trigger, then defaults, side effects, and the exclusion — every clause carries information. It is slightly dense with three separate clauses in one sentence, but nothing is wasted.

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 4-parameter mutation tool with full schema coverage and an output schema, the description supplies everything extra an agent needs: the trigger, the side effects, the image-processing misconception, and the sibling boundary.

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%, so the schema already documents name, sizes, formats and projectId, including the enum set and defaults. The description restates the defaults (jpg/webp; 512, 256, 128, 64) without adding format, syntax, or interaction rules beyond what the schema 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?

States a specific verb and resource ('create one Imagelato preset that specifies widths and formats') and its downstream effect ('for future image processing'), which clearly separates it from update_template and list_templates among siblings.

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?

Opens with an explicit trigger ('Use this when the user wants to create...') and closes with an explicit exclusion ('Not for editing a preset'), routing the agent to the update sibling without requiring schema inspection.

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