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

No annotations provided, so description carries full burden. It states it returns upcoming dates and vaccines, but does not disclose behavioral traits like response format, error handling, or prerequisites. Most critically, it claims 'last vaccine date' as input, but this parameter is absent from the schema, which is misleading and reduces transparency.

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 sentences, front-loaded with purpose. However, the inclusion of 'last vaccine date' as an input—while not in schema—adds unnecessary inaccuracy. Could be more concise by removing that mention or aligning with 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?

Despite an output schema existing (not seen), the description lacks detail about what the schedule includes (e.g., which vaccines, timing intervals). The missing 'last vaccine date' parameter leaves a gap. No behavioral context or error scenarios are described, making it incomplete for an agent to reliably invoke the tool.

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 coverage is 100% with two parameters (pet_type, birth_date), but the description adds a third 'last vaccine date' not present in the schema, causing contradiction. For existing parameters, description adds minimal meaning beyond schema definitions (enum and format already clear). The extra param misleads about required inputs.

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 clearly states 'Generate upcoming vaccination schedule for a puppy or kitten', which is a specific verb+resource. It distinguishes adequately from sibling tools like calculate_pet_age or calculate_dog_food, and references list_bundles for related calculators. However, it mentions 'last vaccine date' as an input, which is not in the schema, causing slight confusion.

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 says 'Use for pet care planning' and refers to list_bundles for related tools, giving some context. However, it lacks explicit guidance on when not to use this tool versus alternatives like calculate_pet_age for age calculations. No exclusions or specific scenarios are provided.

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