get_unread_messages

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

readOnlyHint=true and openWorldHint=true already cover the safety profile, so the description owes the agent extra context and supplies almost none. It does not say whether results are paged, ordered by recency, capped by a server-side maximum, or what "this account" implies about auth scope.

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?

One short, front-loaded sentence with no filler or repetition. It is efficiently structured, though the brevity borders on under-specification rather than tightness.

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?

An output schema exists, so return values need not be described, and the single param is fully documented in-schema. However, the unresolved ambiguity with get_unread_notification_count and the undefined "PLATO" term leave real gaps for an agent choosing between tools.

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?

There is a single optional parameter and schema description coverage is 100% ("Maximum number of unread notifications to return"), so the schema already does the work. The description adds no meaning about ordering, truncation behavior, or what happens when limit is omitted, 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?

"Get this account's unread PLATO notifications" gives a clear verb (get) and resource (unread notifications), but leaves "PLATO" undefined and, more importantly, does not differentiate from the sibling get_unread_notification_count, which an agent could easily confuse with this one.

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?

No when-to-use guidance is offered. The obvious question — fetch full unread notifications vs. just call get_unread_notification_count — is never addressed, and no prerequisite, pagination, or freshness context is given.

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