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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds value by disclosing the returned fields (status values, last 30 days, per-visit cap), but says nothing about pagination, ordering, or result limits for a list operation.

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?

It is a single sentence with no wasted words, but it is a noun-phrase fragment rather than a purpose statement, and the trailing clauses about status, 30 days, and the per-visit cap pile up without clear structure.

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?

With no output schema, the description carries the burden of describing the return, and it does identify the entity and the notable returned attributes. It stops short of covering list-level behaviors like volume or ordering, but is otherwise adequate for a parameterless read.

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?

The tool takes zero parameters, so the baseline is 4. There are no inputs requiring semantic explanation, and the schema is trivially complete.

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 concretely explains what a 'proactive message' is (chat messages, pop-ups, banners the widget shows visitors), which is valuable given the abstract name. It implies a collection read but never states a verb like 'list' or 'returns', and it doesn't distinguish 'list all' from the sibling get_proactive_message (single fetch).

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?

There is no when-to-use or when-not-to-use guidance and no mention of alternatives such as get_proactive_message, get_proactive_message_report, or the create/update/pause siblings. The listing intent is only inferable from the tool name.

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