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

Goes beyond the annotations by disclosing that no client is notified, that a wrong date is correctable with one more call (implying low-risk/reversible), and that a Cotlet API key with app access is required. These are genuine behavioral facts the annotations (readOnlyHint=false, destructiveHint=false) do not convey.

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?

The opening repeats itself, saying the same thing twice ("record a vaccine with its expiration date on the pet's Medical Information" then "Adds the vaccine with its Expiration date under Medical Information"), and the "DaySmart: DaySmart Pet" prefix is redundant. It's reasonably short but the redundancy costs it.

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 three-required-param mutation tool with annotations and no output schema, the description covers purpose, a prerequisite, notification behavior, reversibility, and auth needs. The main missing piece is explicit sibling routing, but otherwise it is complete enough to call correctly.

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 all three parameters are already documented in the schema. The description largely repeats the vaccine Master-list constraint and expiration-date semantics rather than adding new syntax or format detail, so the baseline of 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?

States a specific verb (record/add) and resource (vaccine with expiration date) placed on the pet's Medical Information, which is concrete enough for an agent to act on. It does not explicitly contrast itself with siblings like daysmart_update_pet_notes or daysmart_list_vaccination_alerts, but the purpose is unambiguous.

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?

Provides one precondition ("The vaccine must be on your Master Vaccination list") and implies the pet must exist via the schema's pet_id-from-get_client reference. However, it offers no explicit when-to-use vs alternative guidance or exclusions for sibling tools, leaving usage context mostly inferred.

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