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

With no annotations supplied, the description carries the full behavioral burden. It usefully discloses the credit cost (2 credits) and the return key (processedImage), but says nothing about processing time, output dimensions, whether the logo must be transparent, or failure modes for unusable images.

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?

Three short sentences, front-loaded with the core action and followed by the return value and cost. Every sentence carries distinct information with no filler.

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 two-parameter tool with a fully documented schema and no output schema, the description covers purpose, return key, and cost adequately. It falls short only on behavioral details like image requirements and output characteristics that an agent might want before committing 2 credits.

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 both the image source formats and the mockupType enum are already fully documented in the schema. The description adds only the general framing of 'merchandise or signage', which loosely maps to the enum but adds no new syntax or constraint detail; baseline 3 applies.

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 states a specific verb and resource: placing a logo onto a realistic merchandise or signage mockup. It clearly conveys the transformation performed, though it does not explicitly differentiate itself from near-neighbors like poster_generator or create_image.

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?

Usage is implied by the phrase 'merchandise or signage mockup', which signals the intended scenario. However, there is no explicit when-to-use versus when-to-use-an-alternative guidance, and no mention of prerequisites such as logo transparency or minimum resolution.

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