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

Annotations already declare the safe-read profile (readOnlyHint, destructiveHint=false, openWorldHint). The description adds genuinely new behavior: results are sorted soonest-first, vaccinations are flagged 3 months ahead, and it requires a Cotlet API key with app access. It omits pagination/result-size behavior, so not a 5.

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 purpose is front-loaded, but the description repeats the same idea twice ('pets whose vaccinations are expired or expire before a date' vs. 'Returns pets with a vaccination record that is expired or expires before the date you give'). The redundancy costs it conciseness.

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?

There is no output schema, and the description compensates by stating the return fields (vaccine and expiration date) and ordering. It also covers the auth prerequisite. Complete enough to call correctly, though ordering/sort details for equal dates and pagination are unaddressed.

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%, so both parameters are already documented in the schema. The description only echoes the date-filtering concept ('expire before the date you give') and does not clarify upcoming_only or date-format edge cases. Baseline 3 is appropriate when the schema carries the parameter burden.

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 (list) and resource (vaccination alerts) and immediately clarifies what the returned set contains: pets with an expired or soon-expiring vaccination record. This is clearly distinguishable from siblings like daysmart_add_vaccination or daysmart_list_appointments.

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?

Explains the triggering condition (expired or expiring before the given date) and an important exclusion: pets with no record for a required vaccine are not listed. It also notes the 3-month-ahead flagging window, giving useful context on when a pet surfaces. No alternative tool is named, so it stops short of a 5.

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